java 返回json格式数据 java servlet 返回json

（1）核心

                1.设置content-type为application/json

                2.直接作为数据使用输出流进行输出

（2）实例

package com.learn.servlet;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;

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

import com.alibaba.fastjson.JSON;

public class JsonServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	private User buildUserDO(){
		User user = new User();
		user.setName("张三");
		user.setPassword("123");
		user.setAge(11);
		user.setBirthDay(new Date());
		
		return user;
	}
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("application/json; charset=utf-8");
		response.setCharacterEncoding("UTF-8");

		String userJson = JSON.toJSONString(buildUserDO());
		OutputStream out = response.getOutputStream();
		out.write(userJson.getBytes("UTF-8"));
		out.flush();
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	}

}

               运行结果为：