ES6的Fetch异步请求的实现方法

  var url = "/fetch";
     fetch(url,{
       method:"post",
       headers:{
         "Content-type":"application/x-www-form-urlencoded"
       },
       body:"name=luwenjing&age=22"
     })
      .then(function (response){
        if (response.status == 200){
          return response;
        }
      })
      .then(function (data) {
       return data.text();
      })
      .then(function(text){
        console.log("请求成功，响应数据为:",text);
      })
      .catch(function(err){
        console.log("Fetch错误:"+err);
      });

import java.io.IOException;
import java.io.Writer;

/**
 * Created by LuWenjing on 2017/4/5.
 */
public class fetchServlet extends javax.servlet.http.HttpServlet {
  protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    String name = request.getParameter("name");
    String age = request.getParameter("age");
    System.out.println(name + ": " + age);
    Writer out = response.getWriter();
    out.write("hello world!");
  }

  protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    doPost(request, response);
  }
}