前言
只是简单的配置实现了cors，并没有讲任何东西。（有兴趣的可看: CORS 跨域 实现思路及相关解决方案）
github： https://github.com/vergilyn/SpringBootDemo
代码位置：
origin：表示服务端程序（默认为:127.0.0.1:8080）。其中有CorsFilter，且allow-origina配置为http://127.0.0.1:8081。
client_a/client_b：分别是客户端。其中client_a的端口号是8081，client_b的端口号是8082.
@SpringBootApplication public class CorsOriginApplication { public final static String CORS_ADDRESS = "127.0.0.1"; public static void main(String[] args) { SpringApplication.run(CorsOriginApplication.class,args); } }
@Controller
@RequestMapping("/cors")
public class CorsOriginController {
/**
* 如果CrosFilter中配置有Access-Control-Allow-Origin, 则CrossOrigin无效。
* 否则, 以@CrossOrigin为准。
* @return
*/
@CrossOrigin(origins = "http://127.0.0.1:8082")
@RequestMapping("/get")
@ResponseBody
public Map<String,Object> get(){
return Constant.map;
}
}@Configuration @WebFilter(urlPatterns = "/cors") public class CorsFilter extends OncePerRequestFilter { private final static String ALLOWORIGIN_CORS_A = "http://127.0.0.1:8081"; private final static String ALLOWORIGIN_CORS_b = "http://127.0.0.1:8082"; @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { // Access-Control-Allow-Origin: 指定授权访问的域 response.addHeader("Access-Control-Allow-Origin", ALLOWORIGIN_CORS_A); //此优先级高于@CrossOrigin配置 // Access-Control-Allow-Methods: 授权请求的方法（GET, POST, PUT, DELETE，OPTIONS等) response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE"); response.addHeader("Access-Control-Allow-Headers", "Content-Type"); response.addHeader("Access-Control-Max-Age", "1800");//30 min filterChain.doFilter(request, response); } }
注意:
如果在CorsFilter中配置有"Access-Control-Allow-Origin", 则controller中方法注解@CrossOrigin失效。（即filter的优先级高于@CrossOrigin方法注解）
Cors A:
@SpringBootApplication @Controller public class CorsAApplication implements EmbeddedServletContainerCustomizer { private static int CORS_A_PORT = 8081; public static void main(String[] args) { SpringApplication app = new SpringApplication(CorsAApplication.class); app.run(args); } @Override public void customize(ConfigurableEmbeddedServletContainer container) { container.setPort(CORS_A_PORT); } @RequestMapping("corsA") public String index(Model model){ model.addAttribute("port",CORS_A_PORT); model.addAttribute("address", CorsOriginApplication.CORS_ADDRESS); return "cors/corsA_index"; } }
corsA_index.html:
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <script type="text/javascript" src="./static/common/jquery-2.1.4.js"></script> <title>cors client_a</title> <script type="text/javascript"> /*<![CDATA[*/ function corsFilter() { var url = "http://localhost:8080/cors/get"; $.ajax({ type: 'get', url: url, data: {}, success: function (r) { $("#result").text(JSON.stringify(r)); }, error: function (err) { console.info(err); alert('error!'); } }); } /*]]>*/ </script> </head> <body> <h4>cors client_a</h4> <p th:text="'server.address: ' + ${address}"/> <p th:text="'server.port: ' + ${port}"/> <p>cors配置： allowOrigin = "http://127.0.0.1:8081", 所以此页面可以得到结果！</p> <input type="button" value="request" onclick="corsFilter()"/><br/> <h5>结果：</h5> <p id="result"></p> </body> </html>
Cors B:
@SpringBootApplication @Controller public class CorsBApplication implements EmbeddedServletContainerCustomizer { private static int CORS_B_PORT = 8082; public static void main(String[] args) { SpringApplication app = new SpringApplication(CorsBApplication.class); app.run(args); } @Override public void customize(ConfigurableEmbeddedServletContainer container) { container.setPort(CORS_B_PORT); } @RequestMapping("corsB") public String index(Model model){ model.addAttribute("port",CORS_B_PORT); model.addAttribute("address", CorsOriginApplication.CORS_ADDRESS); return "cors/corsB_index"; } }
corsB_index.html:
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <script type="text/javascript" src="./static/common/jquery-2.1.4.js"></script> <title>cors client_b</title> <script type="text/javascript"> /*<![CDATA[*/ function corsFilter() { var url = "http://localhost:8080/cors/get"; $.ajax({ type: 'get', url: url, data: {}, success: function (r) { $("#result").text(JSON.stringify(r)); }, error: function (err) { console.info(err); $("#errMsg").css("display","block"); alert('error!'); } }); } /*]]>*/ </script> </head> <body> <h4>cors client_b</h4> <p th:text="'server.address: ' + ${address}"/> <p th:text="'server.port: ' + ${port}"/> <p>cors配置: allowOrigin = "http://127.0.0.1:8081", 所以此页面<font color="red">无法得到结果！</font></p> <input type="button" value="request" onclick="corsFilter()"/><br/> <h5>结果：</h5> <p id="result"></p> <h5>错误描述：</h5> <p id="errMsg" style="display: none"> 已拦截跨源请求：同源策略禁止读取位于 http://localhost:8080/cors/get 的远程资源。（原因：CORS 头 'Access-Control-Allow-Origin' 不匹配 'http://127.0.0.1:8081'）。 </p> </body> </html>
结果演示:
1. 127.0.0.1:8081/corsA可以正确的请求"http://localhost:8080/cors/get"并正确得到返回的结果。
2. 127.0.0.1:8082/corsB可以正确的请求"http://localhost:8080/cors/get"但无法正确得到请求结果。
