SSM跨域拦截设置

 1 package com.donleo.ssm.filter;
 2 
 3 import javax.servlet.*;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import java.io.IOException;
 7 
 8 /**
 9  * @author liangd
10  * date 2020-11-17 17:05
11  * code 跨域设置
12  */
13 public class CrossDomainFilter implements Filter {
14     private boolean isCross = false;
15 
16     @Override
17     public void destroy() {
18         isCross = false;
19     }
20 
21     @Override
22     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
23             throws IOException, ServletException {
24         if (isCross) {
25             HttpServletRequest httpServletRequest = (HttpServletRequest) request;
26             HttpServletResponse httpServletResponse = (HttpServletResponse) response;
27             System.out.println("拦截请求: " + httpServletRequest.getServletPath());
28             httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
　　　　　　　　　//允许cookie跨域设置
　　　　　　　　　//httpServletResponse.setHeader("Access-Control-Allow-Origin", httpServletRequest.getHeader("Origin"));

29             httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
30             httpServletResponse.setHeader("Access-Control-Max-Age", "0");
31             httpServletResponse.setHeader("Access-Control-Allow-Headers",
32                     "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
33             httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
34             httpServletResponse.setHeader("XDomainRequestAllowed", "1");
35         }
36         chain.doFilter(request, response);
37     }
38 
39     @Override
40     public void init(FilterConfig filterConfig) throws ServletException {
41         String isCrossStr = filterConfig.getInitParameter("IsCross");
42         isCross = isCrossStr.equals("true") ? true : false;
43         System.out.println(isCrossStr);
44     }
45 }

如果前端设了允许跨域携带cookie，服务器可能会报错:需要制定一个具体的请求源，
httpServletRequest.getHeader("Origin") 方法直接获取请求源的地址；
例如，发送求的地址是：localhost:8058,那么httpServletRequest.getHeader("Origin")就会获得localhost:8058
意思就是：谁来请求我，我就允许谁请求。

前端Ajax发送请求

 1 function MyAjax(url,data,type,callback) {
 2    let user=$.cookie("token")
 3    $.ajax({
 4        url:URL+url,
 5        type:type,
 6        contentType:"application/json; charset=utf-8",
 7        headers:{
 8            "Authorization":$.cookie("token")
 9       },
10        dataType:"json",
11        data:data,
12        //
13        xhrFields: {
14            withCredentials: true //允许跨域带Cookie
15       },
16        success:function (res) {
17            AssertToken(res)
18            callback(res);
19            // console.log(res)
20       },
21        error:function (err) {
22            // console.log(err)
23       }
24   })
25 }

作者：donleo123

出处：https://www.cnblogs.com/donleo123/

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