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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)

2019年07月22日  | 移动技术网IT编程  | 我要评论

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℃"}]}]}

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