使用Gson解析JSON数据

本文使用gson对json进行解析处理

首先，下载gson包 ，本文使用(gson-1.6.jar)

package com.whroid.java.json;

import com.google.gson.Gson;

public class GsonUtil {

    /**
     * 将json字符串转换成对象。需要保证json中的key和对象的属性名以及属性一致
     * @param json
     * @param cls
     * @return
     */
    public  static Object json2Object(String json,Class cls) {
        Object obj = null;
        try {
            Gson gson = new Gson();
            obj = gson.fromJson(json, cls);
        } catch (Exception e) {
            obj = new Object();
        }
        
        return obj;
    }


    /**
     * 将对象转换成json字符串
     * @param object
     * @return
     */
    public  static String object2JsonString(Object object) {
        if(object == null){
            return "";
        }
        Gson gson = new Gson();
        return gson.toJson(object).toString();
    }
    
}

添加实例对象JSONBean(可以不设置getter()/setter()方法，但必须保证属性名和类型一致)

package com.whroid.java.json;

import java.util.ArrayList;
import java.util.List;


public class JSONBean {

    private String name  = "name";
    private int id = 1;
    private List<String> list = new ArrayList<String>();
    private boolean b;
    SubBean subBean = new SubBean();
    
    @Override
    public String toString() {
        return "JSONBean [name=" + name + ", id=" + id + ", list=" + list
                + ", b=" + b + ", subBean=" + subBean + "]";
    }
    
    
}
class SubBean{
    String subname = "subname";

    
    @Override
    public String toString() {
        return "SubBean [subname=" + subname + "]";
    }
    
}

调用介绍

public static void main(String[] args) {
        
     JSONBean bean = new JSONBean();
     String gson =     GsonUtil.object2JsonString(bean);
     System.out.println("gson:"+gson);
     bean = (JSONBean) GsonUtil.json2Object(gson, JSONBean.class);
     System.out.println("bean:"+bean);
        
    }

返回结果：

gson:{"name":"name","id":1,"list":[],"b":false,"subBean":{"subname":"subname"}}

//使用解析gson返回的数据，进行对象实例
bean:JSONBean [name=name, id=1, list=[], b=false, subBean=SubBean [subname=subname]]