Java中Json字符串直接转换为对象(包括多层List集合)

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);  //Json字符串 //jsonStrBody

Map  classMap = new HashMap();
classMap.put("results", WeatherBean_Baidu_City.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类实体代码******************************************

*********************WeatherBean_Baidu实体 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;
}

}

*********************WeatherBean_Baidu_City 实体 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_City implements Serializable {

private String currentCity;//城市名称
private String pm25;//pm2.5值
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;
}

}

*********************使用到的几个JAVA类实体代码******************************************

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"},

{"currentCity":"徐州","pm25":"154"}

]

}

//private List<WeatherBean_Baidu_City> results;
//private String currentCity;//城市名称
//private String pm25;//pm2.5值

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作者：catoop
来源：CSDN
原文：多级可以参考https://blog.csdn.net/catoop/article/details/42744705