spring练习1
老菜鸟·
帮助1人
1、练习网站案例
1、建好相应的java类
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package spring;
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public class Player {
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getPosition() {
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return position;
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}
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public void setPosition(String position) {
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this.position = position;
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}
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private int id;
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private String name;
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private String position;
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}
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2、准备好xml文件配置
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
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http://www.springframework.org/schema/tx
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http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<bean name="" class="spring.Player">
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<property name="name" value="niko" />
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<property name="position" value="步枪手" />
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</bean>
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</beans>
3、准备好测试类
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package text;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import spring.Player;
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public class Test {
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public static void main(String[] args) {
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ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
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Player c = (Player) context.getBean("s");
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System.out.println(c.getName() " " c.getPosition());
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}
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}
没问题：
1、来个队伍类
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public class Team {
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private String teamname;
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private String game;
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public String getTeamname() {
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return teamname;
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}
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public void setTeamname(String teamname) {
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this.teamname = teamname;
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}
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public String getGame() {
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return game;
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}
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public void setGame(String game) {
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this.game = game;
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}
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}
2、配置文件作出相应修改，写一个能创建Team类的bean并在创建Player类的bean中调动他
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
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http://www.springframework.org/schema/tx
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http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<bean name="s" class="spring.Player">
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<property name="name" value="niko" />
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<property name="position" value="步枪手" />
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<property name="team" ref="t" />
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</bean>
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<bean name="t" class="spring.Team">
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<property name="teamname" value="G2" />
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<property name="game" value="csgo" />
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</bean>
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</beans>
3、测试类
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package text;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import spring.Player;
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public class Test {
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public static void main(String[] args) {
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ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
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Player c = (Player) context.getBean("s");
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System.out.println(c.getName() " " c.getPosition() " " c.getTeam().getTeamname() " " c.getTeam().getGame());
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}
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}
没问题
1、修改配置文件
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
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http://www.springframework.org/schema/tx
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http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<context:annotation-config/>
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<bean name="s" class="spring.Player">
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<property name="name" value="niko" />
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<property name="position" value="步枪手" />
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</bean>
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<bean name="t" class="spring.Team">
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<property name="teamname" value="G2" />
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<property name="game" value="csgo" />
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</bean>
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</beans>
2、为player加上注解
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package spring;
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import org.springframework.beans.factory.annotation.Autowired;
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public class Player {
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getPosition() {
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return position;
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}
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public void setPosition(String position) {
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this.position = position;
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}
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private int id;
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private String name;
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private String position;
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public Team getTeam() {
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return team;
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}
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public void setTeam(Team team) {
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this.team = team;
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}
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private Team team;
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}
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没问题
试试对bean的注解：
1、修改xml，注意这里指个包名就可以了，不要指明类名
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
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http://www.springframework.org/schema/tx
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http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<context:component-scan base-package="spring"/>
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</beans>
2、添加相关注释
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package spring;
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import org.springframework.stereotype.Component;
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public class Team {
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private String teamname = "navi";
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private String game = "csgo";
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public String getTeamname() {
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return teamname;
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}
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public void setTeamname(String teamname) {
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this.teamname = teamname;
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}
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public String getGame() {
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return game;
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}
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public void setGame(String game) {
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this.game = game;
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}
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}
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package spring;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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public class Player {
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getPosition() {
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return position;
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}
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public void setPosition(String position) {
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this.position = position;
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}
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private int id;
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private String name = "s1mple";
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private String position = "狙击手";
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public Team getTeam() {
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return team;
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}
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public void setTeam(Team team) {
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this.team = team;
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}
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private Team team;
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}
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没毛病：
2、教材练习
setter注入之前已经用过，现在试试构造器注入
1、给team类加个带参构造方法
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package spring;
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import org.springframework.stereotype.Component;
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public class Team {
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private String teamname;
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private String game;
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public Team(String teamname ,String game){
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this.teamname = teamname;
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this.game = game;
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}
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public String getTeamname() {
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return teamname;
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}
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public void setTeamname(String teamname) {
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this.teamname = teamname;
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}
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public String getGame() {
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return game;
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}
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public void setGame(String game) {
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this.game = game;
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}
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}
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2、创建相应xml
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
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http://www.springframework.org/schema/tx
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http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<bean name="t" class="spring.Team">
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<constructor-arg>
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<value>faze</value>
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</constructor-arg>
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<constructor-arg>
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<value>csgo</value>
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</constructor-arg>
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</bean>
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</beans>
3、测试类
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package text;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import spring.Player;
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import spring.Team;
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public class Test {
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public static void main(String[] args) {
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ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
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Team c = (Team) context.getBean("t");
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System.out.println(c.getTeamname() " " c.getGame());
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}
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}
没毛病
接下来我们试试教材dao模式操作
1、类还是用我们之前的Player类
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package spring;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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public class Player {
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getPosition() {
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return position;
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}
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public void setPosition(String position) {
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this.position = position;
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}
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private int id;
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private String name;
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private String position;
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}
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2、来一个接口，这个接口可以不止抽象定义一种方法，后面可以按照需求定义多个方法，在这里只是尝试一个方法。
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package impl;
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import spring.Player;
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public interface Playerdaoimpl {
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public void inserplayer(Player p);
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}
3、定义一个dao类。这里用到了try。。。finally异常处理方法，这种方式简单来说就是尝试try中的代码，不管是否成功，最终都要执行finally中的代码
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package dao;
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import java.sql.Connection;
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import java.sql.SQLException;
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import java.sql.Statement;
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import javax.sql.DataSource;
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import impl.Playerdaoimpl;
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import spring.Player;
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public class Playerdao implements Playerdaoimpl{
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private DataSource dataSource;//注入DataSource
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public DataSource getDataSource() {
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return dataSource;
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}
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public void setDataSource(DataSource dataSource) {
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this.dataSource = dataSource;
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}
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public void inserplayer(Player p){
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String name = p.getName();
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String position = p.getPosition();
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Connection conn = null;
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Statement stmt = null;
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try {
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conn = dataSource.getConnection();//获取数据库连接
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stmt = conn.createStatement();
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stmt.execute("insert into player (name,position) "
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"values('" name "','" position "')");
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} catch (SQLException e) {
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e.printStackTrace();
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}
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finally {
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if(stmt != null) {
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try {
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stmt.close();//关闭Statement对象
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}
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catch(SQLException e) {
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e.printStackTrace();
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}
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}
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if(conn != null) {
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try {
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conn.close();//关闭数据库连接
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}
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catch(SQLException e) {
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e.printStackTrace();
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}
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}
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}
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}
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}
4、配置文件，注意对应好自己的数据库相关信息
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<beans
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xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
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<!-- 配置数据源 -->
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<bean id="dataSource"
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class="org.springframework.jdbc.datasource.DriverManagerDataSource">
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<property name="driverClassName">
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<value>com.mysql.jdbc.Driver</value>
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</property>
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<property name="url">
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<value>jdbc:mysql://localhost:3306/test
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</value>
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</property>
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<property name="username">
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<value>root</value>
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</property>
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<property name="password">
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<value>123456</value>
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</property>
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</bean>
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<bean id="userDAO" class="com.mr.dao.UserDAO">
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<property name="dataSource">
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<ref local="dataSource"/>
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</property>
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</bean>
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</beans>
5、创建好相应的数据库
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CREATE TABLE player (
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id INT NOT NULL AUTO_INCREMENT,
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name VARCHAR(50) NOT NULL,
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position VARCHAR(50),
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PRIMARY KEY (id)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
6、创建测试类
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package text;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import dao.Playerdao;
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import spring.Player;
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public class Test {
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public static void main(String[] args) {
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ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
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Player p = new Player("simple" ,"狙击手");
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Playerdao dao = (Playerdao) context.getBean("playerdao");
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dao.inserplayer(p);
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System.out.println("成功");
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}
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}
报了个错，是字符编码问题
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java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
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at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
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at com.mysql.jdbc.Connection.configureClientCharacterSet(Connection.java:2412)
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at com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:4139)
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at com.mysql.jdbc.Connection.createNewIO(Connection.java:2789)
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at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
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at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
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at java.sql.DriverManager.getConnection(DriverManager.java:664)
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at java.sql.DriverManager.getConnection(DriverManager.java:208)
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at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
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at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
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at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
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at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
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at dao.Playerdao.inserplayer(Playerdao.java:26)
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at text.Test.main(Test.java:15)
我们修改xml文件中url为
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<property name="url">
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<value>jdbc:mysql://localhost:3306/how2java?useUnicode=true&characterEncoding=UTF-8</value>
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</property>
再次运行，没问题
最后用用JdbcTemple：
1、配置xml
-
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<beans
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xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
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<!-- 配置数据源 -->
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<bean id="dataSource"
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class="org.springframework.jdbc.datasource.DriverManagerDataSource">
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<property name="url">
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<value>jdbc:mysql://localhost:3306/how2java?useUnicode=true&characterEncoding=UTF-8</value>
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</property>
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<property name="username">
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<value>root</value>
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</property>
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<property name="password">
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<value>123456</value>
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</property>
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</bean>
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<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
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<property name="dataSource">
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<ref local="dataSource"/>
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</property>
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</bean>
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</beans>
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package text;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import org.springframework.jdbc.core.JdbcTemplate;
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import dao.Playerdao;
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import spring.Player;
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public class Test {
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public static void main(String[] args) {
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JdbcTemplate jtl = null;
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ApplicationContext factory = new ClassPathXmlApplicationContext("applicationContext.xml");//获取配置文件
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jtl =(JdbcTemplate)factory.getBean("jdbcTemplate");
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String sql = "insert into player(name,position) values ('niko' ,'步枪手')";
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jtl.update(sql);
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System.out.println("添加操作执行成功");
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}
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}
没问题
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