使用第三方工具，将JavaBean对象或者List<JavaBean/String/Integer>或Set或Map对象转成JSON

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准备导入第三方jar包：

》commons-beanutils-1.7.0.jar
》commons-collections-3.1.jar
》commons-lang-2.5.jar
》commons-logging-1.1.1.jar
》ezmorph-1.0.3.jar
》json-lib-2.1-jdk15.jar

User.java

package com.itcast.android;public class User {    private Integer id;    private String name;    private String gener;    public User() {    }    public User(Integer id, String name, String gener) {        super();        this.id = id;        this.name = name;        this.gener = gener;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getGener() {        return gener;    }    public void setGener(String gener) {        this.gener = gener;    }}

Bean2Json.java

package com.itcast.android;import java.util.ArrayList;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import net.sf.json.JSONArray;/** * 使用第三方工具类,将Bean转化为JSON文本 *  * @author ZXY * */public class Bean2Json {    // Bean转化JSON    public void bean2jsion() {        User user = new User(1, "笨笨", "男");        // 将User对象转化为JSON文本        JSONArray jsonArray = JSONArray.fromObject(user);        // 获取JSON文本        String json = jsonArray.toString();        // 输出控制台显示        System.out.println(json);        // [{"gener":"男","id":1,"name":"笨笨"}]    }    // List<Bean>转化JSON    public void list2jsion() {        List<User> userList = new ArrayList<User>();        userList.add(new User(1, "张飞", "男"));        userList.add(new User(2, "刘备", "男"));        userList.add(new User(3, "关羽", "男"));        JSONArray jsonArray = JSONArray.fromObject(userList);        String json = jsonArray.toString();        System.out.println(json);        // [{"gener":"男","id":1,"name":"张飞"},{"gener":"男","id":2,"name":"刘备"},{"gener":"男","id":3,"name":"关羽"}]    }    // Map<String,Object>转化JSON    public void map2json() {        List<User> userList = new ArrayList<User>();        userList.add(new User(1, "张飞", "男"));        userList.add(new User(2, "刘备", "男"));        userList.add(new User(3, "关羽", "男"));        userList.add(new User(4, "小乔", "女"));        Map<String, Object> map = new LinkedHashMap<String, Object>();        //存放集合的长度        map.put("size", userList.size());        //存放整个集合        map.put("list", userList);        //通过第三方工具将Map转化为JSon文本        JSONArray jsonArray = JSONArray.fromObject(map);        String json = jsonArray.toString();        System.out.println(json);        //[{"size":4,"list":[{"gener":"男","id":1,"name":"张飞"},{"gener":"男","id":2,"name":"刘备"},{"gener":"男","id":3,"name":"关羽"},{"gener":"女","id":4,"name":"小乔"}]}]        //通过如下代码将最外面[]去掉        json=json.substring(1,json.length()-1);        System.out.println(json);        //{"size":4,"list":[{"gener":"男","id":1,"name":"张飞"},{"gener":"男","id":2,"name":"刘备"},{"gener":"男","id":3,"name":"关羽"},{"gener":"女","id":4,"name":"小乔"}]}    }    public static void main(String[] args) {        Bean2Json test = new Bean2Json();        test.bean2jsion();        test.list2jsion();        test.map2json();    }}

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