@Configuration
public class CustomCorsConfiguration {
 
 @Bean
 public WebMvcConfigurer corsConfigurer() {
  return new WebMvcConfigurerAdapter() {
     @Override
     public void addCorsMappings(CorsRegistry registry) {
       registry.addMapping("/api/**").allowedOrigins("http://localhost:8080");
     }
  };
 }
}

/**
 * 全局设置
 *
 * @author wujing
 */
@Configuration
public class CustomCorsConfiguration2 extends WebMvcConfigurerAdapter {
 
 @Override
 public void addCorsMappings(CorsRegistry registry) {
  registry.addMapping("/api/**").allowedOrigins("http://localhost:8080");
 }
}

/**
 * @author wujing
 */
@RestController
@RequestMapping("/api")
public class ApiController {
 
 @RequestMapping(value = "/get")
 public HashMap<String, Object> get(@RequestParam String name) {
  HashMap<String, Object> map = new HashMap<String, Object>();
  map.put("title", "hello world");
  map.put("name", name);
  return map;
 }
}

$.ajax({
          url: "http://localhost:8081/api/get",
        type: "POST",
        data: {
          name: "测试"
        },
        success: function(data, status, xhr) {
          console.log(data);
          alert(data.name);
        }
       });

 /**
 * @author wujing
 */
@RestController
@RequestMapping(value = "/api", method = RequestMethod.POST)
public class ApiController {
 
 @CrossOrigin(origins = "http://localhost:8080")
 @RequestMapping(value = "/get")
 public HashMap<String, Object> get(@RequestParam String name) {
  HashMap<String, Object> map = new HashMap<String, Object>();
  map.put("title", "hello world");
  map.put("name", name);
  return map;
 }
}