@Configuration
public class GlobalCorsConfig {

    @Bean
    public CorsFilter corsFilter() {
        //1. 添加 CORS配置信息
        CorsConfiguration config = new CorsConfiguration();
        //放行哪些原始域
        config.addAllowedOrigin("*");
        //是否發(fā)送 Cookie
        config.setAllowCredentials(true);
        //放行哪些請(qǐng)求方式
        config.addAllowedMethod("*");
        //放行哪些原始請(qǐng)求頭部信息
        config.addAllowedHeader("*");
        //暴露哪些頭部信息
        config.addExposedHeader("*");
        //2. 添加映射路徑
        UrlBasedCorsConfigurationSource corsConfigurationSource = new UrlBasedCorsConfigurationSource();
        corsConfigurationSource.registerCorsConfiguration("/**",config);
        //3. 返回新的CorsFilter
        return new CorsFilter(corsConfigurationSource);
    }
}

@Configuration
public class CorsConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                //是否發(fā)送Cookie
                .allowCredentials(true)
                //放行哪些原始域
                .allowedOrigins("*")
                .allowedMethods(new String[]{"GET", "POST", "PUT", "DELETE"})
                .allowedHeaders("*")
                .exposedHeaders("*");
    }
}

@RestController
@CrossOrigin(origins = "*")
public class HelloController {

    @RequestMapping("/hello")
    public String hello() {
        return "hello world";
    }
}

@RequestMapping("/hello")
@CrossOrigin(origins = "*")
 //@CrossOrigin(value = "http://localhost:8081") //指定具體ip允許跨域
public String hello() {
      return "hello world";
}

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;

@Component
public class MyCorsFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res,
                         FilterChain chain) throws IOException, ServletException {

        HttpServletResponse response = (HttpServletResponse) res;
        HttpServletRequest httpServletRequest = (HttpServletRequest) req;
        response.setHeader("Access-Control-Allow-Origin", httpServletRequest.getHeader("origin"));
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        chain.doFilter(req, res);

    }

    public void init(FilterConfig filterConfig) {}
    public void destroy() {}
}

 response.addHeader("Access-Control-Allow-Origin", "*");
 response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
 response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
 response.addHeader("Access-Control-Max-Age", "1800");//30 min

server {
        listen       80;
        server_name  abc.com;
        #charset koi8-r;
        #access_log  logs/host.access.log  main;

        location /client { #訪問客戶端路徑
            proxy_pass http://localhost:81;
            proxy_redirect default;
        }
        location /apis { #訪問服務(wù)器路徑
            rewrite  ^/apis/(.*)$ /$1 break;
            proxy_pass   http://localhost:82;
       }
}

location / {
   add_header Access-Control-Allow-Origin *;
   add_header Access-Control-Allow-Headers X-Requested-With;
   add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,OPTIONS;

   if ($request_method = 'OPTIONS') {
     return 204;
   }
}