CROS(Cross-Origin Resource Sharing) 用于解决浏览器中跨域请求的问题。简单的Get请求可以使用JSONP来解决，而对于其它复杂的请求则需要后端应用的支持CROS。Spring在4.2版本之后提供了@CrossOrigin 注解来实现对Cross的支持。

在Controller方法上配置

@CrossOrigin(origins = {"http://loaclhost:8088"})@RequestMapping(value = "/crossTest",method = RequestMethod.GET)public String greeting() {  return "corss test";}

在Controller上配置，那么这个Controller中的所有方法都会支持CORS

import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.CrossOrigin;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@CrossOrigin(origins = "http://localhost:8088",maxAge = 3600)@Controller@RequestMapping("/api")public class AppController {    @RequestMapping(value = "/crossTest",method = RequestMethod.GET)    public String greeting() {      return "corss test";    }}

Java Config全局配置

import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.CorsRegistry;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configuration@EnableWebMvcpublic class SpringWebConfig extends WebMvcConfigurerAdapter {  /**   * {@inheritDoc}   *

This implementation is empty.   *   * @param registry   */  @Override  public void addCorsMappings(CorsRegistry registry) {    super.addCorsMappings(registry);    // 对所有的URL配置    registry.addMapping("/**");    // 针对某些URL配置    registry.addMapping("/api/**").allowedOrigins("http:///localhost:8088")        .allowedMethods("PUT","DELETE")        .allowedHeaders("header1","header2","header3")        .exposedHeaders("header1","header2")        .allowCredentials(false).maxAge(3600);  }}

XML全局配置