JavaEE必知必会第六讲-jsonlib

6.1 下载jsonlib所需的6个jar包

点此进入下载官网
这个网址是maven仓库的国内镜像地址，比较好用

选择合适的版本

一般选择jar依赖包方式下载

下载完成后即可，同理，在这个网站里继续下载另外5个json包
如果最后一个json-lib下载不了，你可以尝试用镜像文件,你也可以到另一个网站中去下载json-lib下载网址，点此进入

然后复制到相应的目录下，如下图

6.2 JSON转换成Object的案例

新建一个servlet， GetJSONAarrayData代码如下

package com.iflytek.servlet;

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

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

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * Servlet implementation class GetJSONAarrayData
 */
@WebServlet("/GetJSONAarrayData.do")
public class GetJSONAarrayData extends HttpServlet {
     
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GetJSONAarrayData() {
     
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     
		// TODO Auto-generated method stub
		//response.getWriter().append("Served at: ").append(request.getContextPath());
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     
		// TODO Auto-generated method stub
		//doGet(request, response);
		JSONObject object=JSONObject.fromObject(new CodeLanguage(1,"java","Write once,run anywhere"));
		//第二种方法
//		List objArray=new ArrayList();
//		objArray.add(new CodeLanguage(1,"java","1"));
//		objArray.add(new CodeLanguage(2,"C#","2"));
//		JSONArray jsonarray=JSONArray.fromObject(objArray);
		response.setContentType("text/html;charset=utf-8");
		response.getWriter().write(object.toString());
		
	}

}

2.新建一个类CodeLanguage

package com.iflytek.servlet;

public class CodeLanguage {
     
	private int id;
	private String test;
	private String desc;
	public int getId() {
     
		return id;
	}
	public void setId(int id) {
     
		this.id = id;
	}
	public String getTest() {
     
		return test;
	}
	public void setTest(String test) {
     
		this.test = test;
	}
	public String getDesc() {
     
		return desc;
	}
	public void setDesc(String desc) {
     
		this.desc = desc;
	}
	public CodeLanguage(int id, String test, String desc) {
     
		super();
		this.id = id;
		this.test = test;
		this.desc = desc;
	}
	
	public CodeLanguage()
	{
     
		
	}

}

然后运行tomcat进行调试，结果如下图