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【spring boot】SpringBoot初学（9.1）– 简单配置corsFilter对跨域请求支持

2017-04-16 22:19 1046 查看

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：

@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);
}
}

CorsOriginApplication.java

@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。

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