json格式字符串直接转换为java对象的方法(包括多层list集合)

2017-08-15 23:21:58   作者:MangoCool   来源:MangoCool

 WeatherBean_Baidu类:

package wei.pojo;

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;
    }
 
}

WeatherBean_Baidu_City类:

package wei.pojo;

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;
    }
 
}

WeatherBean_Baidu_City_Index类:

package wei.pojo;

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;
    }
 
}

WeatherBean_Baidu_City_Weatherdata类:

package wei.pojo;

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;
    }
 
}
测试代码JSONObjectTest类:
package test;

import java.util.HashMap;
import java.util.Map;

import net.sf.json.JSONObject;
import wei.pojo.WeatherBean_Baidu;
import wei.pojo.WeatherBean_Baidu_City;
import wei.pojo.WeatherBean_Baidu_City_Index;
import wei.pojo.WeatherBean_Baidu_City_Weatherdata;

public class JSONObjectTest {
	
	public static void main(String[] args) {
		// 测试json字符串
		String jsonStr = "{\"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℃\"}]}]}";
		JSONObject jsonObj = JSONObject.fromObject(jsonStr);
		Map<String, Class> classMap2 = new HashMap<String, Class>();
		classMap2.put("results", WeatherBean_Baidu_City.class);
		classMap2.put("index", WeatherBean_Baidu_City_Index.class); 
		classMap2.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, classMap2); 
		System.out.println(weather);
	}

}

代码跑起来之后,你就很明白了。

注:在构建bean的时候,尽量用小写字母开始;你的json字符串的key名称,不能大写字母开头,不然转换不了。

好比这种:

{
	"Uin": 0,
	"UserName": "@39e249ec0281b7fc7a558128d1b0ee77",
	"NickName": "",
	"AttrStatus": 0,
	"PYInitial": "",
	"PYQuanPin": "",
	"RemarkPYInitial": "",
	"RemarkPYQuanPin": "",
	"MemberStatus": 0,
	"DisplayName": "",
	"KeyWord": "Cry"
}

如果遇到这种情况,提供一种解决方法:

/**
 * 将jsonkey值首字母转换成小写
 * @param jsonStr
 * @return
 */
public static String jsonKey2Lower(String jsonStr) {
	
	String regex = "\"[a-zA-Z]+\":";// 匹配key
	Pattern pattern = Pattern.compile(regex);
	StringBuffer sb = new StringBuffer();
	Matcher matcher = pattern.matcher(jsonStr);
	while (matcher.find()) {
		String key = matcher.group(0);
		String new_key = key.substring(0,1) + key.substring(1,2).toLowerCase() + key.substring(2);
		matcher.appendReplacement(sb, new_key); // 将替换后的子串以及其之前到上次匹配子串之后的字符串段添加到一个StringBuffer对象里。
	}
	matcher.appendTail(sb); // 将最后一次匹配工作后剩余的字符串添加到一个StringBuffer对象里
	return sb.toString();
}


参考文章:http://www.jb51.net/article/91142.htm

标签: java json字符串 转换对象 多层list

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