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Java中Json字符串直接转换为对象的方法(包括多层List集合)

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 26 4
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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:

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// 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:

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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;
     }
 
}
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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;
     }
 
}
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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;
     }
 
}
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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 。

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{ "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℃" }]}]}

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