Servlet 后端解决跨域问题

后端写了一个接口 然后报错显示跨域问题 转载http://four.haser.top/

 

 

package servlet;


import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSON;

import dao.BaseDao;
import dao.music511Dao;
import entity.musicDetail;

import util.HttpUtil;
import util.utildao;


public class music511Port extends HttpServlet {
    @Override
    public void init() throws ServletException {
        //读取配置文件
         InputStream is = this.getServletContext().getResourceAsStream("WEB-INF/server.xml");     
        BaseDao.ReadXml(is);
    }
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
      response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Credentials", "true"); response.setHeader("Access-Control-Allow-Methods", "*"); response.setHeader("Access-Control-Max-Age", "3600"); response.setHeader("Access-Control-Allow-Headers", "Authorization,Origin,X-Requested-With,Content-Type,Accept," + "content-Type,origin,x-requested-with,content-type,accept,authorization,token,id,X-Custom-Header,X-Cookie,Connection,User-Agent,Cookie,*"); response.setHeader("Access-Control-Request-Headers", "Authorization,Origin, X-Requested-With,content-Type,Accept"); response.setHeader("Access-Control-Expose-Headers", "*");
            request.setCharacterEncoding("utf-8");
            int id = Integer.parseInt(request.getParameter("id"));
            List<musicDetail> queryByid = music511Dao.QueryByid(id);
            Object json = JSON.toJSON(queryByid);
            utildao.MyPrint(response, json);
    }
}