Java中string字符串转json对象方法
Java利用JSONObject进行string字符串转换成JSON对象
转换实例一
public class StringToJSON { public static void main(String[] args) throws JSONException{ System.out.println("abc"); //定义JSON字符串 String jsonStr = "{\"id\": 2," + " \"title\": \"json title\", " + "\"config\": {" + "\"width\": 34," + "\"height\": 35," + "}, \"data\": [" + "\"JAVA\", \"JavaScript\", \"PHP\"" + "]}"; //转换成为JSONObject对象 JSONObject jsonObj = new JSONObject(jsonStr); //从JSONObject对象中获取数据 JavaBean bean = new JavaBean(); //根据属性名称获取int型数据; bean.setId(jsonObj.getInt("id")); //根据属性名获取String数据; bean.setTitle(jsonObj.getString("title")); //根据属性名获取JSONObject类 JSONObject config = jsonObj.getJSONObject("config"); bean.setWidth(config.getInt("width")); bean.setHeight(config.getInt("height")); //根据属性名获取JSONArray数组 JSONArray data = jsonObj.getJSONArray("data"); for(int index = 0, length = data.length(); index < length; index++) { } } }
转换实例二
public class User { String id; String name; int age; }
public class Json{ public static void main(String[] args) { //String 转json String text ="{'id':'001','name':'jack','age':22}"; JSONObject jo =JSONObject.fromObject(text); System.out.println(jo.get("id") +"__"+ jo.get("name") +"___" + jo.getInt("age")); //String 转对象 等于是先转成json然后转对象 String text2="{'id':'002','name':'lion','age':23}"; User u1 = (User)JSONObject.toBean(JSONObject.fromObject(text2), User.class); System.out.println(u1.getId()+"___"+u1.getName()+"__"+u1.getAge()); //对象转json User u =new User(); u.setId("003"); u.setAge(25); u.setName("Tom"); JSONObject jo2 =JSONObject.fromObject(u); System.out.println(jo2); System.out.println(jo2.get("name")); } }
执行结果:
001__jack___22 002___lion__23 {"age":25,"id":"003","name":"Tom"} Tom
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