本文实例讲述了Java实现的JSONUtil工具类与用法。分享给大家供大家参考,具体如下:
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import java.util.HashMap; import java.util.Map; import com.alibaba.druid.util.StringUtils; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; public class JSONUtils { /** * Bean对象转JSON * * @param object * @param dataFormatString * @return */ public static String beanToJson(Object object, String dataFormatString) { if (object != null ) { if (StringUtils.isEmpty(dataFormatString)) { return JSONObject.toJSONString(object); } return JSON.toJSONStringWithDateFormat(object, dataFormatString); } else { return null ; } } /** * Bean对象转JSON * * @param object * @return */ public static String beanToJson(Object object) { if (object != null ) { return JSON.toJSONString(object); } else { return null ; } } /** * String转JSON字符串 * * @param key * @param value * @return */ public static String stringToJsonByFastjson(String key, String value) { if (StringUtils.isEmpty(key) || StringUtils.isEmpty(value)) { return null ; } Map<String, String> map = new HashMap<String, String>(); map.put(key, value); return beanToJson(map, null ); } /** * 将json字符串转换成对象 * * @param json * @param clazz * @return */ public static Object jsonToBean(String json, Object clazz) { if (StringUtils.isEmpty(json) || clazz == null ) { return null ; } return JSON.parseObject(json, clazz.getClass()); } /** * json字符串转map * * @param json * @return */ @SuppressWarnings ( "unchecked" ) public static Map<String, Object> jsonToMap(String json) { if (StringUtils.isEmpty(json)) { return null ; } return JSON.parseObject(json, Map. class ); } } |
测试:
JSON字符串转map
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public static void main(String[] args) { String jsonStr = "{'userName':'huangbaokang','password':'123456'}" ; Map<String, Object> map = JSONUtils.jsonToMap(jsonStr); System.out.println(map.get( "userName" )); } |
输出:
huangbaokang
JSON字符串转对象:
新建User类
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public class User { private String userName; private String password; public String getUserName() { return userName; } public void setUserName(String userName) { this .userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this .password = password; } } public static void main(String[] args) { String jsonStr = "{'userName':'huangbaokang','password':'123456'}" ; User user = (User) JSONUtils.jsonToBean(jsonStr, new User()); System.out.println( "用户名=" +user.getUserName()+ " 密码=" +user.getPassword()); } |
测试输出:
输出用户名=huangbaokang 密码=123456
对象转JSON
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public static void main(String[] args) { User user = new User(); user.setUserName( "huangbaokang" ); user.setPassword( "123456" ); String result = JSONUtils.beanToJson(user); System.out.println(result); } |
测试输出:
{"password":"123456","userName":"huangbaokang"}
在这里工具类应用的jar为阿里巴巴的fastjson,在lib中加入相关jar。
希望本文所述对大家java程序设计有所帮助。
原文链接:https://blog.csdn.net/huangbaokang/article/details/78042956