使用到的類：net.sf.json.JSONObject
使用JSON時，除了要導入JSON網站上面下載的json-lib-2.2-jdk15.jar包之外，還必須有其它幾個依賴包：commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar
下面是例子代碼：
// JSON轉換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); // 將JSON轉換成WeatherBean_Baidu WeatherBean_Baidu weather = (WeatherBean_Baidu) JSONObject.toBean(jsonObj, WeatherBean_Baidu.class, classMap); System.out.println(weather.getResults());使用到的幾個JAVA類代碼：
package com.lenovo.conference.entity.vo;import java.io.Serializable;import java.util.List;/** * 天氣Bean * * @author SHANHY * */@SuppressWarnings("serial")public class WeatherBean_Baidu implements Serializable {private String error;//錯誤號private String status;//狀態值private String date;//日期private List<WeatherBean_Baidu_City> results;//城市天氣預報集合（因為一次可以查詢多個城市）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;/** * 天氣Bean * * @author SHANHY * */@SuppressWarnings("serial")public class WeatherBean_Baidu_City implements Serializable {private String currentCity;//城市名稱private String pm25;//pm2.5值private List<WeatherBean_Baidu_City_Index> index;//指數集合private List<WeatherBean_Baidu_City_Weatherdata> weather_data;//幾天的天氣集合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;/** * 天氣Bean * * @author SHANHY * */@SuppressWarnings("serial")public class WeatherBean_Baidu_City_Weatherdata implements Serializable {private String date;// 日期private String dayPictureUrl;// 白天的天氣圖片private String nightPictureUrl;// 晚上的天氣圖片private String weather;// 天氣private String wind;// 風向private String temperature;// 溫度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;/** * 天氣Bean * * @author SHANHY * */@SuppressWarnings("serial")public class WeatherBean_Baidu_City_Index implements Serializable {private String title;//標題private String zs;//舒適度private String tipt;//指數簡述private String des;//指數概述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;}}例子中解析所對應的JSON字符串
{"error":0,"status":"success","date":"2015-01-15","results":[{"currentCity":"南京","pm25":"83","index":[{"title":"穿衣","zs":"較冷","tipt":"穿衣指數","des":"建議著厚外套加毛衣等服裝。年老體弱者宜著大衣、呢外套加羊毛衫。"},{"title":"洗車","zs":"較適宜","tipt":"洗車指數","des":"較適宜洗車，未來一天無雨，風力較小，擦洗一新的汽車至少能保持一天。"},{"title":"旅遊","zs":"適宜","tipt":"旅遊指數","des":"天氣較好，氣溫稍低，會感覺稍微有點涼，不過也是個好天氣哦。適宜旅遊，可不要錯過機會呦！"},{"title":"感冒","zs":"少發","tipt":"感冒指數","des":"各項氣象條件適宜，無明顯降溫過程，發生感冒機率較低。"},{ "title":"運動","zs":"較不宜","tipt":"運動指數","des":"陰天，且天氣寒冷，推薦您在室內進行低強度運動；若堅持戶外運動，請選擇合適的運動並註意保暖。"},{"title":"紫外線強度","zs":"最弱","tipt":"紫外線強度指數","des":"屬弱紫外線輻射天氣，無需特別防護。若長期在戶外，建議塗擦SPF在8-12之間的防曬護膚品。"}],"weather_data":[{"dat e":"週四01月15日(實時：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/yin.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"陰轉多雲","wind":"北風微風","temperature":"8 ~ 4℃"},{"date":"週五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"多雲轉晴","wind":"西北風3-4級","temperature":"12 ~ 0℃"},{"date":"週六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"晴轉多雲","wind":"東北風3-4級","temperature":"8 ~ 0℃"},{"date":"週日","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":"西風微風","temperature":"10 ~ -1℃"}]},{"currentCity":"徐州","pm25":"154","index":[{"title":"穿衣","zs":"較冷","tipt":"穿衣指數","des":"建議著厚外套加毛衣等服裝。年老體弱者宜著大衣、呢外套加羊毛衫。 "},{"title":"洗車","zs":"較適宜","tipt":"洗車指數","des":"較適宜洗車，未來一天無雨，風力較小，擦洗一新的汽車至少能保持一天。 "},{"title":"旅遊","zs":"適宜","tipt":"旅遊指數","des":"天氣較好，但絲毫不會影響您出行的心情。溫度適宜又有微風相伴，適宜旅遊。 "},{"title":"感冒","zs":"較易發","tipt":"感冒指數","des":"天氣較涼，較易發生感冒，請適當增加衣服。體質較弱的朋友尤其應該注意防護。 "},{"title":"運動","zs":"較不宜","tipt":"運動指數","des":"天氣較好，但考慮天氣寒冷，推薦您進行各種室內運動，若在戶外運動請注意保暖並做好準備活動。 "},{"title":"紫外線強度","zs":"最弱","tipt":"紫外線強度指數","des":"屬弱紫外線輻射天氣，無需特別防護。若長期在戶外，建議塗擦SPF在8-12之間的防曬護膚品。 "}],"weather_data":[{"date":"週四01月15日(實時：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多雲","wind":"南風微風","temperature":"10 ~ 3℃"},{"date":"週五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多雲","wind":"北風3-4級","temperature":"11 ~ -4℃"},{"date":"週六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多雲","wind":"東風微風","temperature":"6 ~ -4℃"},{"date":"週日","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多雲","wind":"西風3-4級","temperature":"11 ~ -1℃"}]}]}以上這篇Java中Json字符串直接轉換為對象的方法(包括多層List集合)就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。