Spring cloud gateway 代替Nginx实现端口转发并添加统一跨域+token认证

原Nginx端口转发配置：

server {
        listen       80;
        server_name  localhost;

        # location / {
        #     # 静态资源服务
        #     root   D:/nginx-1.21.1/static;
        #     index  index.html index.htm;
        # }

        # ~为正则匹配，路径中包含xxx就转发到对应的url
        location ~ /hosp/ {           
            proxy_pass http://localhost:8201;
        }
        location ~ /cmn/ {           
            proxy_pass http://localhost:8202;
        }
    }

Spring cloud gateway 端口转发配置：

# 服务端口
server.port=80
# 服务名
spring.application.name=service-gateway

# nacos服务地址
spring.cloud.nacos.discovery.server-addr=http://42.13.146.333:8848

#使用服务发现路由
spring.cloud.gateway.discovery.locator.enabled=true

#设置路由id
spring.cloud.gateway.routes[0].id=service-hosp
#设置路由的uri
spring.cloud.gateway.routes[0].uri=lb://service-hosp
#设置路由断言,代理servicerId为auth-service的/auth/路径
spring.cloud.gateway.routes[0].predicates= Path=/*/hosp/**

#设置路由id
spring.cloud.gateway.routes[1].id=service-cmn
#设置路由的uri
spring.cloud.gateway.routes[1].uri=lb://service-cmn
#设置路由断言,代理servicerId为auth-service的/auth/路径
spring.cloud.gateway.routes[1].predicates= Path=/*/cmn/**

统一跨域配置：

package com.qwx.gateway.config;

@Configuration
public class CrosConfig {

    @Bean
    public CorsWebFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedMethod("*");
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
        source.registerCorsConfiguration("/**", config);

        return new CorsWebFilter(source);
    }

}

全局token认证

/**
 * 全局Filter，统一处理会员登录与外部不允许访问的服务
 *
 * @author qiaowenxuan
 */
@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String path = request.getURI().getPath();
        System.out.println("===" path);

        //内部服务接口，不允许外部访问
        if(antPathMatcher.match("/**/inner/**", path)) {
            ServerHttpResponse response = exchange.getResponse();
            return out(response, ResultCode.PERMISSION);
        }

        //api接口，异步请求，校验用户必须登录
        if(antPathMatcher.match("/api/**/auth/**", path)) {
            Long userId = this.getUserId(request);
            if(StringUtils.isEmpty(userId)) {
                ServerHttpResponse response = exchange.getResponse();
                return out(response, ResultCode.LOGIN_AUTH);
            }
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }

    /**
     * api接口鉴权失败返回数据
     * @param response
     * @return
     */
    private Mono<Void> out(ServerHttpResponse response, ResultCode resultCodeEnum) {
        Result result = Result.build(null, resultCodeEnum);
        byte[] bits = JSONObject.toJSONString(result).getBytes(StandardCharsets.UTF_8);
        DataBuffer buffer = response.bufferFactory().wrap(bits);
        //指定编码，否则在浏览器中会中文乱码
        response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
        return response.writeWith(Mono.just(buffer));
    }

    /**
     * 获取当前登录用户id
     * @param request
     * @return
     */
    private Long getUserId(ServerHttpRequest request) {
        String token = "";
        List<String> tokenList = request.getHeaders().get("token");
        if(null  != tokenList) {
            token = tokenList.get(0);
        }
        if(!StringUtils.isEmpty(token)) {
            return JwtHelper.getUserId(token);
        }
        return null;
    }
}

token生成工具类：

public class JwtHelper {
    //过期时间
    private static long tokenExpiration = 24*60*60*1000;
    //生成token的标识
    private static String tokenSignKey = "123456";

    /**
     * 创建token方法
     * @param userId
     * @param userName
     * @return
     */
    public static String createToken(Long userId, String userName) {
        String token = Jwts.builder()
                .setSubject("YYGH-USER")
                //过期时间
                .setExpiration(new Date(System.currentTimeMillis()   tokenExpiration))
                //token携带信息
                .claim("userId", userId)
                .claim("userName", userName)
                .signWith(SignatureAlgorithm.HS512, tokenSignKey)
                .compressWith(CompressionCodecs.GZIP)
                .compact();
        return token;
    }

    /**
     * 获取token中携带的userId
     * @param token
     * @return
     */
    public static Long getUserId(String token) {
        if(StringUtils.isEmpty(token)) return null;
        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        Integer userId = (Integer)claims.get("userId");
        return userId.longValue();
    }

    /**
     * 获取token中携带的userName
     * @param token
     * @return
     */
    public static String getUserName(String token) {
        if(StringUtils.isEmpty(token)) return "";
        Jws<Claims> claimsJws
                = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        return (String)claims.get("userName");
    }

    /**
     * 测试
     * @param args
     */
    public static void main(String[] args) {
        String token = JwtHelper.createToken(1L, "55");
        System.out.println(token);
        System.out.println(JwtHelper.getUserId(token));
        System.out.println(JwtHelper.getUserName(token));
    }
}

这篇好文章是转载于：学新通技术网