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：
// JSON转换JSONObject jsonObj = JSONObject.fromObject(jsonStrBody);Map<String, Class> classMap = new HashMap<String, Class>();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：
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<WeatherBean_Baidu_City> 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<WeatherBean_Baidu_City> getResults() {return results;}public void setResults(List<WeatherBean_Baidu_City> results) {this.results = results;}}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<WeatherBean_Baidu_City_Index> index;//指数集合private List<WeatherBean_Baidu_City_Weatherdata> 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<WeatherBean_Baidu_City_Index> getIndex() {return index;}public void setIndex(List<WeatherBean_Baidu_City_Index> index) {this.index = index;}public List<WeatherBean_Baidu_City_Weatherdata> getWeather_data() {return weather_data;}public void setWeather_data(List<WeatherBean_Baidu_City_Weatherdata> weather_data) {this.weather_data = weather_data;}}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;}}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
{"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℃"}]}]}以上这篇Java中Json字符串直接转换为对象的方法(包括多层List集合)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持武林网。