Java中Json字符串直接转换为对象(包括多层List集合)

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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 plaincopy

 

1. // JSON转换  
2. JSONObject jsonObj = JSONObject.fromObject(jsonStrBody);  
3.   
4. Map<String, Class> classMap = new HashMap<String, Class>();  
5.          classMap.put("results", WeatherBean_Baidu_City.class);  
6.          classMap.put("index", WeatherBean_Baidu_City_Index.class);    
7.          classMap.put("weather_data", WeatherBean_Baidu_City_Weatherdata.class);    
8.          // 将JSON转换成WeatherBean_Baidu    
9.          WeatherBean_Baidu weather = (WeatherBean_Baidu) JSONObject.toBean(jsonObj,    
10.                 WeatherBean_Baidu.class, classMap);   
11.          System.out.println(weather.getResults());  

使用到的几个JAVA类代码：

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1. package com.lenovo.conference.entity.vo;  
2.   
3. import java.io.Serializable;  
4. import java.util.List;  
5.   
6. /**  
7.  * 天气Bean  
8.  *   
9.  * @author SHANHY  
10.  *   
11.  */  
12. @SuppressWarnings("serial")  
13. public class WeatherBean_Baidu implements Serializable {  
14.   
15.     private String error;//错误号  
16.     private String status;//状态值  
17.     private String date;//日期  
18.     private List<WeatherBean_Baidu_City> results;//城市天气预报集合（因为一次可以查询多个城市）  
19.   
20.     public WeatherBean_Baidu() {  
21.         super();  
22.     }  
23.   
24.     public String getError() {  
25.         return error;  
26.     }  
27.   
28.     public void setError(String error) {  
29.         this.error = error;  
30.     }  
31.   
32.     public String getStatus() {  
33.         return status;  
34.     }  
35.   
36.     public void setStatus(String status) {  
37.         this.status = status;  
38.     }  
39.   
40.     public String getDate() {  
41.         return date;  
42.     }  
43.   
44.     public void setDate(String date) {  
45.         this.date = date;  
46.     }  
47.   
48.     public List<WeatherBean_Baidu_City> getResults() {  
49.         return results;  
50.     }  
51.   
52.     public void setResults(List<WeatherBean_Baidu_City> results) {  
53.         this.results = results;  
54.     }  
55.   
56. }  

[java] view plaincopy

 

1. package com.lenovo.conference.entity.vo;  
2.   
3. import java.io.Serializable;  
4. import java.util.List;  
5.   
6. /** 
7.  * 天气Bean 
8.  *  
9.  * @author SHANHY 
10.  *  
11.  */  
12. @SuppressWarnings("serial")  
13. public class WeatherBean_Baidu_City implements Serializable {  
14.   
15.     private String currentCity;//城市名称  
16.     private String pm25;//pm2.5值  
17.     private List<WeatherBean_Baidu_City_Index> index;//指数集合  
18.     private List<WeatherBean_Baidu_City_Weatherdata> weather_data;//几天的天气集合  
19.   
20.     public WeatherBean_Baidu_City() {  
21.         super();  
22.     }  
23.   
24.     public String getCurrentCity() {  
25.         return currentCity;  
26.     }  
27.   
28.     public void setCurrentCity(String currentCity) {  
29.         this.currentCity = currentCity;  
30.     }  
31.   
32.     public String getPm25() {  
33.         return pm25;  
34.     }  
35.   
36.     public void setPm25(String pm25) {  
37.         this.pm25 = pm25;  
38.     }  
39.   
40.     public List<WeatherBean_Baidu_City_Index> getIndex() {  
41.         return index;  
42.     }  
43.   
44.     public void setIndex(List<WeatherBean_Baidu_City_Index> index) {  
45.         this.index = index;  
46.     }  
47.   
48.     public List<WeatherBean_Baidu_City_Weatherdata> getWeather_data() {  
49.         return weather_data;  
50.     }  
51.   
52.     public void setWeather_data(  
53.             List<WeatherBean_Baidu_City_Weatherdata> weather_data) {  
54.         this.weather_data = weather_data;  
55.     }  
56.   
57. }  

[java] view plaincopy

 

1. package com.lenovo.conference.entity.vo;  
2.   
3. import java.io.Serializable;  
4.   
5. /** 
6.  * 天气Bean 
7.  *  
8.  * @author SHANHY 
9.  *  
10.  */  
11. @SuppressWarnings("serial")  
12. public class WeatherBean_Baidu_City_Weatherdata implements Serializable {  
13.   
14.     private String date;// 日期  
15.     private String dayPictureUrl;// 白天的天气图片  
16.     private String nightPictureUrl;// 晚上的天气图片  
17.     private String weather;// 天气  
18.     private String wind;// 风向  
19.     private String temperature;// 温度  
20.   
21.     public WeatherBean_Baidu_City_Weatherdata() {  
22.         super();  
23.     }  
24.   
25.     public String getDate() {  
26.         return date;  
27.     }  
28.   
29.     public void setDate(String date) {  
30.         this.date = date;  
31.     }  
32.   
33.     public String getDayPictureUrl() {  
34.         return dayPictureUrl;  
35.     }  
36.   
37.     public void setDayPictureUrl(String dayPictureUrl) {  
38.         this.dayPictureUrl = dayPictureUrl;  
39.     }  
40.   
41.     public String getNightPictureUrl() {  
42.         return nightPictureUrl;  
43.     }  
44.   
45.     public void setNightPictureUrl(String nightPictureUrl) {  
46.         this.nightPictureUrl = nightPictureUrl;  
47.     }  
48.   
49.     public String getWeather() {  
50.         return weather;  
51.     }  
52.   
53.     public void setWeather(String weather) {  
54.         this.weather = weather;  
55.     }  
56.   
57.     public String getWind() {  
58.         return wind;  
59.     }  
60.   
61.     public void setWind(String wind) {  
62.         this.wind = wind;  
63.     }  
64.   
65.     public String getTemperature() {  
66.         return temperature;  
67.     }  
68.   
69.     public void setTemperature(String temperature) {  
70.         this.temperature = temperature;  
71.     }  
72.   
73. }  

[java] view plaincopy

 

1. package com.lenovo.conference.entity.vo;  
2.   
3. import java.io.Serializable;  
4.   
5. /** 
6.  * 天气Bean 
7.  *  
8.  * @author SHANHY 
9.  *  
10.  */  
11. @SuppressWarnings("serial")  
12. public class WeatherBean_Baidu_City_Index implements Serializable {  
13.   
14.     private String title;//标题  
15.     private String zs;//舒适度  
16.     private String tipt;//指数简述  
17.     private String des;//指数概述  
18.   
19.     public WeatherBean_Baidu_City_Index() {  
20.         super();  
21.     }  
22.   
23.     public String getTitle() {  
24.         return title;  
25.     }  
26.   
27.     public void setTitle(String title) {  
28.         this.title = title;  
29.     }  
30.   
31.     public String getZs() {  
32.         return zs;  
33.     }  
34.   
35.     public void setZs(String zs) {  
36.         this.zs = zs;  
37.     }  
38.   
39.     public String getTipt() {  
40.         return tipt;  
41.     }  
42.   
43.     public void setTipt(String tipt) {  
44.         this.tipt = tipt;  
45.     }  
46.   
47.     public String getDes() {  
48.         return des;  
49.     }  
50.   
51.     public void setDes(String des) {  
52.         this.des = des;  
53.     }  
54.   
55. }  

例子中解析所对应的JSON字符串

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1. {"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℃"}]}]} 

Java中Json字符串直接转换为对象(包括多层List集合)

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原文地址：http://www.cnblogs.com/wanqieddy/p/4652084.html