从Java 类产生json(json-lib)

来源：互联网发布：文华程序化模型源码编辑：程序博客网时间：2024/06/06 01:29

   json-lib的依赖包：
            commons-logging.jar
            common.lang.jar
            xom.jar(XMLObject Model)
            commons-beanutils.jar
            commons-collections-3.0.jar
            ezmorph-0.9.2.jar

json2.4.rar
  大概就是这些，第一个例子搞了一一个小时，依赖包太多了

   json-lib可以将java中的Array,Collections,Object,XML转化成json对象

      http://json-lib.sourceforge.net/usage.html

我按照官方文档写的例子：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.*;
public class Test {

    /**
     * @param args
     */
    private static boolean[] boolArray={true,false};
    private static List list = new ArrayList();
    private static Map map=new HashMap();
    private static Object[] test={new TestBean(),new TestBean()};
    public static void main(String[] args) {

    //转换Array
    JSONArray jsonArray = JSONArray.fromObject( boolArray );
    //System.out.println(jsonArray.toString());
    JSONArray jsonArray1=JSONArray.fromObject("['1','2','3']");
    //System.out.println(jsonArray1.toString());

    list.add("first");
    list.add("second");
    //list.add(new TestBean());
    //转换List
    JSONArray jsonList = JSONArray.fromObject(list);
    System.out.println(jsonList);

    //转换map
    map.put("name", "windfree");
    map.put("bool", Boolean.TRUE);
    map.put("int",new Integer(0));
    map.put( "arr", new String[]{"a","b"} );
    map.put("func", "function (i){ return this.arr[i]; }");
    map.put("bean",test);
    JSONObject jsonMap = JSONObject.fromObject(map);
    //System.out.println(jsonMap);

    //转换Bean
    JSONObject jsonBean=JSONObject.fromObject(new TestBean());
    //System.out.println(jsonBean);




    }

}

输出结果
：

[true,false]
["1","2","3"]
["first","second"]
{"bean":[{"name":"windfree","pojoId":1,"func1":function(i){ return this.options[i]; },"func2":function(i){ return this.options[i]; },"options":["a","f"]},
{"name":"windfree","pojoId":1,
"func1":function(i){ return this.options[i]; },
"func2":function(i){ return this.options[i]; },
"options":["a","f"]}],"arr":["a","b"],"int":0,"name":"windfree",
"func":function (i){ return this.arr[i]; },
"bool":true}
{"name":"windfree","pojoId":1,"func1":function(i){ return this.options[i]; },"func2":function(i){ return this.options[i]; },"options":["a","f"]}

最近也在看GWT,GWT包中有一关于json的例子，
http://code.google.com/webtoolkit/documentation/examples/jsonrpc/demo.html
例子中的json对象为一个js文件，我用servlet重新写了一下。

Thumbnail类：

package com.windfree.server;

public class Thumbnail {
    private String Url="http://scd.mm-c1.yimg.com/image/1135881977";
    private int Height=120;
    private int Width=99;
    public int getHeight() {
        return Height;
    }
    public void setHeight(int height) {
        Height = height;
    }
    public String getUrl() {
        return Url;
    }
    public void setUrl(String url) {
        Url = url;
    }
    public int getWidth() {
        return Width;
    }
    public void setWidth(int width) {
        Width = width;
    }
    public Thumbnail(String url, int height, int width) {
        super();
        Url = url;
        Height = height;
        Width = width;
    }
}

Result类：

package com.windfree.server;

public class Result {
    private String Title;
    private String Url;
    private String ClickUrl;
    private String RefererUrl;
    private String FileFormat;
    private int Height;
    private int Width;
    private Thumbnail thumbnail;
    public Result(String title, String url, String clickUrl, String refererUrl, String fileFormat, int height, int width, Thumbnail thumbnail) {
        super();
        Title = title;
        Url = url;
        ClickUrl = clickUrl;
        RefererUrl = refererUrl;
        FileFormat = fileFormat;
        Height = height;
        Width = width;
        this.thumbnail = thumbnail;
    }
    public String getClickUrl() {
        return ClickUrl;
    }
    public void setClickUrl(String clickUrl) {
        ClickUrl = clickUrl;
    }
    public String getFileFormat() {
        return FileFormat;
    }
    public void setFileFormat(String fileFormat) {
        FileFormat = fileFormat;
    }
    public int getHeight() {
        return Height;
    }
    public void setHeight(int height) {
        Height = height;
    }
    public String getRefererUrl() {
        return RefererUrl;
    }
    public void setRefererUrl(String refererUrl) {
        RefererUrl = refererUrl;
    }
    public Thumbnail getThumbnail() {
        return thumbnail;
    }
    public void setThumbnail(Thumbnail thumbnail) {
        this.thumbnail = thumbnail;
    }
    public String getTitle() {
        return Title;
    }
    public void setTitle(String title) {
        Title = title;
    }
    public String getUrl() {
        return Url;
    }
    public void setUrl(String url) {
        Url = url;
    }
    public int getWidth() {
        return Width;
    }
    public void setWidth(int width) {
        Width = width;
    }
}

JSONHttpServlet类：

package com.windfree.server;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

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

import net.sf.json.JSONObject;

public class JSONHttpServlet extends HttpServlet {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private static Map map=new HashMap();
    private static Map map2=new HashMap();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Thumbnail tmail1=new Thumbnail("http://scd.mm-c1.yimg.com/image/1135881977",200,203);
        Thumbnail tmail2=new Thumbnail("http://scd.mm-c1.yimg.com/image/1135881977",100,100);
        Result reulst1=new Result("111","222","333","444","555",100,100,tmail1);
        Result reulst2=new Result("111","222","333","444","555",100,100,tmail2);
        map.put("totalResultsAvailable", "144429");
        map.put("totalResultsReturned", 2);
        map.put("firstResultPosition", 1);
        map.put("result",new Result[]{reulst1,reulst2});
        map2.put("Results", map);
        JSONObject jsonMap=JSONObject.fromObject(map2);
        PrintWriter out = response.getWriter();
        out.println(jsonMap.toString());
    }

}

在例子中的配置文件中的配置文件(JSON.gwt.xml)增加
   <servlet path="/jsonTest"
     class="com.windfree.server.JSONHttpServlet"/>
同时将JSON.java中的URL改为/jsonTest。就可以了。
   结果：