Java中Json字符串直接转换为对象的方法(包括多层List集合)

前端技术 2023/09/02 Java

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phpstudy。

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