1.定义一个类，实现一个Filter接口(导包导servlet的包)

import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class SimpleCORSFilter implements Filter {    private boolean isCross = false;    @Override    public void destroy() {        isCross = false;    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)            throws IOException, ServletException {        if (isCross) {            HttpServletRequest httpServletRequest = (HttpServletRequest) request;            HttpServletResponse httpServletResponse = (HttpServletResponse) response;            System.out.println("拦截请求: " + httpServletRequest.getServletPath());            httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");            httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");            httpServletResponse.setHeader("Access-Control-Max-Age", "0");            httpServletResponse.setHeader("Access-Control-Allow-Headers",                    "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");            httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");            httpServletResponse.setHeader("XDomainRequestAllowed", "1");        }        chain.doFilter(request, response);    }    @Override    public void init(FilterConfig filterConfig) throws ServletException {        String isCrossStr = filterConfig.getInitParameter("IsCross");        isCross = isCrossStr.equals("true") ? true : false;        System.out.println(isCrossStr);    }}

2.在web.xml中加上跨域的配置请求

         
             
      
       SimpleCORSFilter
              
      
       com.aone.app.filter.SimpleCORSFilter
              
                  
       
        IsCross
                   
       
        true
               
          
         
             
      
       SimpleCORSFilter
              
      
       /*
          
     

3.在Springmvc.xml中配置跨域请求

 4.maven依赖

         
           
      
       com.thetransactioncompany
            
      
       cors-filter
            
      
       2.5
          
     

 

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