1、在web.xml添加filter

     
      
       contextfilter
      
      
       com.cf.hr.filter.WebContextFilter
      
     
     
      
       contextfilter
      
      
       /*
      
     

 

2、filter实现

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.HttpServletResponse; public class WebContextFilter implements Filter {     @Override    public void destroy() {        // TODO Auto-generated method stub             }     @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)            throws IOException, ServletException {        HttpServletResponse  httpServletResponse = (HttpServletResponse) response;        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");        httpServletResponse.setHeader("Access-Control-Allow-Headers", "accept,content-type");         httpServletResponse.setHeader("Access-Control-Allow-Methods", "OPTIONS,GET,POST,DELETE,PUT");         chain.doFilter(request, httpServletResponse);             }     @Override    public void init(FilterConfig arg0) throws ServletException {        // TODO Auto-generated method stub             } }