java后端重定向

飞羽小菜鸡

2024-04-12 帮助1人

两个问题

1.重定向之后的代码会继续执行

2.当前程序所有代码执行完毕后,才会执行重定向跳转

3.重定向之后,加上return,可让之后的代码不再执行

boolean flag = true;
if (flag) {
response.sendRedirect("url");
return;
}

要点：重定向和请求转发的区别

后端重定向流程图：

学新通

后端重定向默认以get方式

后端使用post方式重定向

public class RedirectWithPost {
Map<String, String> parameter = new HashMap<String, String>();
HttpServletResponse response;
public RedirectWithPost(HttpServletResponse response) {
this.response = response;
}
public void setParameter(String key, String value) {
this.parameter.put(key, value);
}
public void sendByPost(String url) throws IOException {
this.response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = this.response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD>");
out.println(" <meta http-equiv=Content-Type content=\"text/html; charset=utf-8\">");
out.println(" <TITLE>loading</TITLE>");
out.println(" <meta http-equiv=\"Content-Type\" content=\"text/html charset=GBK\">\n");
out.println(" </HEAD>");
out.println(" <BODY>");
out.println("<form name=\"submitForm\" action=\"" url "\" method=\"post\">");
Iterator<String> it = this.parameter.keySet().iterator();
while (it.hasNext()) {
String key = it.next();
out.println("<input type=\"hidden\" name=\"" key "\" value=\"" this.parameter.get(key) "\"/>");
}
out.println("</from>");
out.println("<script>window.document.submitForm.submit();</script> ");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}

后端post重定向

private void loginTokenApi(HttpServletResponse httpServletResponse, String username, String password) throws IOException, ServletException {
RedirectWithPost redirectWithPost = new RedirectWithPost(httpServletResponse);
//redirectUrl请求地址
String redirectUrl = "/loginRecordApi";
redirectWithPost.setParameter("username", username);
redirectWithPost.setParameter("password", password);
redirectWithPost.sendByPost(redirectUrl);
}

这篇好文章是转载于：学新通技术网