Java中Json字符串直接转换为对象(包括多层List集合 嵌套)

FastJson最好用
直接
Student student = JSON.parseObject(jsonString,Student.class);
不需要管是不是嵌套多少层Json

---

http://blog.csdn.net/catoop/article/details/42744705

使用到的类：net.sf.json.JSONObject

使用JSON时，除了要导入JSON网站上面下载的json-lib-2.2-jdk15.jar包之外，还必须有其它几个依赖包：commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar

下面是例子代码：

[java] view plain copy
在CODE上查看代码片派生到我的代码片

// JSON转换  
JSONObject jsonObj = JSONObject.fromObject(jsonStrBody);  

Map classMap = new HashMap();  
         classMap.put("results", WeatherBean_Baidu_City.class);  
         classMap.put("index", WeatherBean_Baidu_City_Index.class);    
         classMap.put("weather_data", WeatherBean_Baidu_City_Weatherdata.class);    
         // 将JSON转换成WeatherBean_Baidu    
         WeatherBean_Baidu weather = (WeatherBean_Baidu) JSONObject.toBean(jsonObj,    
                WeatherBean_Baidu.class, classMap);   
         System.out.println(weather.getResults());  

使用到的几个JAVA类代码：

[html] view plain copy
在CODE上查看代码片派生到我的代码片

package com.lenovo.conference.entity.vo;  

import java.io.Serializable;  
import java.util.List;  

/**  
 * 天气Bean  
 *   
 * @author SHANHY  
 *   
 */  
@SuppressWarnings("serial")  
public class WeatherBean_Baidu implements Serializable {  

    private String error;//错误号  
    private String status;//状态值  
    private String date;//日期  
    private List results;//城市天气预报集合（因为一次可以查询多个城市）  

    public WeatherBean_Baidu() {  
        super();  
    }  

    public String getError() {  
        return error;  
    }  

    public void setError(String error) {  
        this.error = error;  
    }  

    public String getStatus() {  
        return status;  
    }  

    public void setStatus(String status) {  
        this.status = status;  
    }  

    public String getDate() {  
        return date;  
    }  

    public void setDate(String date) {  
        this.date = date;  
    }  

    public List getResults() {  
        return results;  
    }  

    public void setResults(List results) {  
        this.results = results;  
    }  

}  

[java] view plain copy
在CODE上查看代码片派生到我的代码片

package com.lenovo.conference.entity.vo;  

import java.io.Serializable;  
import java.util.List;  

/** 
 * 天气Bean 
 *  
 * @author SHANHY 
 *  
 */  
@SuppressWarnings("serial")  
public class WeatherBean_Baidu_City implements Serializable {  

    private String currentCity;//城市名称  
    private String pm25;//pm2.5值  
    private List index;//指数集合  
    private List weather_data;//几天的天气集合  

    public WeatherBean_Baidu_City() {  
        super();  
    }  

    public String getCurrentCity() {  
        return currentCity;  
    }  

    public void setCurrentCity(String currentCity) {  
        this.currentCity = currentCity;  
    }  

    public String getPm25() {  
        return pm25;  
    }  

    public void setPm25(String pm25) {  
        this.pm25 = pm25;  
    }  

    public List getIndex() {  
        return index;  
    }  

    public void setIndex(List index) {  
        this.index = index;  
    }  

    public List getWeather_data() {  
        return weather_data;  
    }  

    public void setWeather_data(  
            List weather_data) {  
        this.weather_data = weather_data;  
    }  

}  

[java] view plain copy
在CODE上查看代码片派生到我的代码片

package com.lenovo.conference.entity.vo;  

import java.io.Serializable;  

/** 
 * 天气Bean 
 *  
 * @author SHANHY 
 *  
 */  
@SuppressWarnings("serial")  
public class WeatherBean_Baidu_City_Weatherdata implements Serializable {  

    private String date;// 日期  
    private String dayPictureUrl;// 白天的天气图片  
    private String nightPictureUrl;// 晚上的天气图片  
    private String weather;// 天气  
    private String wind;// 风向  
    private String temperature;// 温度  

    public WeatherBean_Baidu_City_Weatherdata() {  
        super();  
    }  

    public String getDate() {  
        return date;  
    }  

    public void setDate(String date) {  
        this.date = date;  
    }  

    public String getDayPictureUrl() {  
        return dayPictureUrl;  
    }  

    public void setDayPictureUrl(String dayPictureUrl) {  
        this.dayPictureUrl = dayPictureUrl;  
    }  

    public String getNightPictureUrl() {  
        return nightPictureUrl;  
    }  

    public void setNightPictureUrl(String nightPictureUrl) {  
        this.nightPictureUrl = nightPictureUrl;  
    }  

    public String getWeather() {  
        return weather;  
    }  

    public void setWeather(String weather) {  
        this.weather = weather;  
    }  

    public String getWind() {  
        return wind;  
    }  

    public void setWind(String wind) {  
        this.wind = wind;  
    }  

    public String getTemperature() {  
        return temperature;  
    }  

    public void setTemperature(String temperature) {  
        this.temperature = temperature;  
    }  

}  

[java] view plain copy
在CODE上查看代码片派生到我的代码片

package com.lenovo.conference.entity.vo;  

import java.io.Serializable;  

/** 
 * 天气Bean 
 *  
 * @author SHANHY 
 *  
 */  
@SuppressWarnings("serial")  
public class WeatherBean_Baidu_City_Index implements Serializable {  

    private String title;//标题  
    private String zs;//舒适度  
    private String tipt;//指数简述  
    private String des;//指数概述  

    public WeatherBean_Baidu_City_Index() {  
        super();  
    }  

    public String getTitle() {  
        return title;  
    }  

    public void setTitle(String title) {  
        this.title = title;  
    }  

    public String getZs() {  
        return zs;  
    }  

    public void setZs(String zs) {  
        this.zs = zs;  
    }  

    public String getTipt() {  
        return tipt;  
    }  

    public void setTipt(String tipt) {  
        this.tipt = tipt;  
    }  

    public String getDes() {  
        return des;  
    }  

    public void setDes(String des) {  
        this.des = des;  
    }  

}  

例子中解析所对应的JSON字符串

[html] view plain copy
在CODE上查看代码片派生到我的代码片

{"error":0,"status":"success","date":"2015-01-15","results":[{"currentCity":"南京","pm25":"83","index":[{"title":"穿衣","zs":"较冷","tipt":"穿衣指数","des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},{"title":"洗车","zs":"较适宜","tipt":"洗车指数","des":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。"},{"title":"旅游","zs":"适宜","tipt":"旅游指数","des":"天气较好，气温稍低，会感觉稍微有点凉，不过也是个好天气哦。适宜旅游，可不要错过机会呦！"},{"title":"感冒","zs":"少发","tipt":"感冒指数","des":"各项气象条件适宜，无明显降温过程，发生感冒机率较低。"},{"title":"运动","zs":"较不宜","tipt":"运动指数","des":"阴天，且天气寒冷，推荐您在室内进行低强度运动；若坚持户外运动，请选择合适的运动并注意保暖。"},{"title":"紫外线强度","zs":"最弱","tipt":"紫外线强度指数","des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}],"weather_data":[{"date":"周四 01月15日 (实时：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/yin.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"阴转多云","wind":"北风微风","temperature":"8 ~ 4℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"多云转晴","wind":"西北风3-4级","temperature":"12 ~ 0℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"晴转多云","wind":"东北风3-4级","temperature":"8 ~ 0℃"},{"date":"周日","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"西风微风","temperature":"10 ~ -1℃"}]},{"currentCity":"徐州","pm25":"154","index":[{"title":"穿衣","zs":"较冷","tipt":"穿衣指数","des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},{"title":"洗车","zs":"较适宜","tipt":"洗车指数","des":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。"},{"title":"旅游","zs":"适宜","tipt":"旅游指数","des":"天气较好，但丝毫不会影响您出行的心情。温度适宜又有微风相伴，适宜旅游。"},{"title":"感冒","zs":"较易发","tipt":"感冒指数","des":"天气较凉，较易发生感冒，请适当增加衣服。体质较弱的朋友尤其应该注意防护。"},{"title":"运动","zs":"较不宜","tipt":"运动指数","des":"天气较好，但考虑天气寒冷，推荐您进行各种室内运动，若在户外运动请注意保暖并做好准备活动。"},{"title":"紫外线强度","zs":"最弱","tipt":"紫外线强度指数","des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}],"weather_data":[{"date":"周四 01月15日 (实时：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"南风微风","temperature":"10 ~ 3℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"北风3-4级","temperature":"11 ~ -4℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"东风微风","temperature":"6 ~ -4℃"},{"date":"周日","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"西风3-4级","temperature":"11 ~ -1℃"}]}]} 

附上项目地址 http://download.csdn.net/detail/u011001084/9729342