JAVA跨域CORS

寫了一個前端vue調用後端Java的接口，報「Access-Control-Allow-Origin」問題。

緣由是由於在Java後端接口沒有處理Access-Control-Allow-Origin.

 

① 下載處理Access-Control-Allow-Origin的2個Jar包，下載地址

而後放入 WebRoot\WEB-INF\lib下

 

②在web.xml文件添加以下

 1     <!-- 跨域處理  開始-->
 2     <filter>
 3         <filter-name>CORS</filter-name>
 4         <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
 5         <init-param>
 6             <param-name>cors.supportedHeaders</param-name>
 7             <param-value>Content-Type,Accept,Origin</param-value>
 8         </init-param>
 9         <init-param>
10             <param-name>cors.supportedMethods</param-name>
11             <param-value>GET, POST, HEAD, PUT, DELETE, OPTIONS</param-value>
12         </init-param>
13     </filter>
14     <filter-mapping>
15         <filter-name>CORS</filter-name>
16         <url-pattern>/*</url-pattern>
17     </filter-mapping>
18     <filter>
19         <filter-name>AccessControlFilter</filter-name>
20         <filter-class>com.xx.xx.filter.AccessControlFilter</filter-class>
21     </filter>
22     <filter-mapping>
23         <filter-name>AccessControlFilter</filter-name>
24         <url-pattern>*</url-pattern>
25     </filter-mapping>
26     <!-- 跨域處理  結束 -->

 

③ 在 com.xx.xx.filter包下新建AccessControlFilter.class文件

 1 package com.cdsoft.platform.filter;
 2 import java.io.IOException;
 3 
 4 import javax.servlet.Filter;
 5 import javax.servlet.FilterChain;
 6 import javax.servlet.FilterConfig;
 7 import javax.servlet.ServletException;
 8 import javax.servlet.ServletRequest;
 9 import javax.servlet.ServletResponse;
10 import javax.servlet.http.HttpServletResponse;
11 
12 
13 public class AccessControlFilter implements Filter {
14     @Override
15     public void init(FilterConfig req) throws ServletException {
16         System.out.println("Access Control Allow Init");
17     }
18 
19     @Override
20     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
21             throws IOException, ServletException {
22         HttpServletResponse response = (HttpServletResponse)resp;
23         response.setHeader("Access-Control-Allow-Origin", "*");
24         chain.doFilter(req, resp);
25     }
26 
27     @Override
28     public void destroy() {
29         System.out.println("Access Control Allow Destroy");
30     }
31 
32 }

 

最後驗證，運行成功！