Java中Json字符串直接转换为对象(包括多层List集合嵌套)

妖狐艹你老母 2022-05-27 22:37 327阅读 0赞

FastJson最好用  
直接  
Student student = JSON.parseObject(jsonString,Student.class);  
不需要管是不是嵌套多少层Json

--------------------

[http://blog.csdn.net/catoop/article/details/42744705][http_blog.csdn.net_catoop_article_details_42744705]

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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附上项目地址 [http://download.csdn.net/detail/u011001084/9729342][http_download.csdn.net_detail_u011001084_9729342]

[http_blog.csdn.net_catoop_article_details_42744705]: http://blog.csdn.net/catoop/article/details/42744705
[http_download.csdn.net_detail_u011001084_9729342]: http://download.csdn.net/detail/u011001084/9729342