后台过滤器处理跨域请求问题

最近由于需要写一个登陆及分页接口, 涉及到跨域的问题,相关过滤器代码贴出来留着以后用

package first;

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 HeadersCORSFilter implements Filter {       public void init(FilterConfig filterConfig) throws ServletException {     }     @Override     public void doFilter(ServletRequest request, ServletResponse servletResponse,             FilterChain chain) throws IOException, ServletException {     HttpServletRequest request2 = (HttpServletRequest)request;          HttpServletResponse response = (HttpServletResponse) servletResponse;          request.setCharacterEncoding("UTF-8");   response.setCharacterEncoding("UTF-8");

  response.setContentType("application/json;charset=UTF-8");

//response.setHeader("Access-Control-Allow-Origin", ///""*"");   //一开始这样设置,但是前端的新框架请求一直不支持,无奈使用下面的方式指定

         response.setHeader("Access-Control-Allow-Origin", request2.getHeader("origin"));   //允许跨域          response.setHeader("Access-Control-Allow-Credentials", "true");          response.setHeader("Access-Control-Allow-Methods", "POST");          response.setHeader("Access-Control-Max-Age", "3600");          response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization");             chain.doFilter(request, servletResponse);     }     @Override     public void destroy() {         // TODO Auto-generated method stub     } }