JSONObject
JSONObject只是一种数据结构,可以理解为JSON格式的数据结构(key-value 结构),可以使用put方法给json对象添加元素。JSONObject可以很方便的转换成字符串,也可以很方便的把其他对象转换成JSONObject对象。
pom:
-
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.28</version></dependency>
1.通过原生生成json数据格式。
-
JSONObject zhangsan = new JSONObject();try {//添加zhangsan.put("name", "张三");zhangsan.put("age", 18.4);zhangsan.put("birthday", "1900-20-03");zhangsan.put("majar", new String[] {"哈哈","嘿嘿"});zhangsan.put("null", null);zhangsan.put("house", false);System.out.println(zhangsan.toString());} catch (JSONException e) {e.printStackTrace();}
2.通过hashMap数据结构生成
-
HashMap<String, Object> zhangsan = new HashMap<>();zhangsan.put("name", "张三");zhangsan.put("age", 18.4);zhangsan.put("birthday", "1900-20-03");zhangsan.put("majar", new String[] {"哈哈","嘿嘿"});zhangsan.put("null", null);zhangsan.put("house", false);System.out.println(new JSONObject(zhangsan).toString());
3.通过实体生成
Student student = new Student(); student.setId(1);student.setAge("20");
student.setName("张三");
//生成json格式
System.out.println(JSON.toJSON(student));
//对象转成string
String stuString = JSONObject.toJSONString(student);
4.JSON字符串转换成JSON对象
-
String studentString = "{\"id\":1,\"age\":2,\"name\":\"zhang\"}";//JSON字符串转换成JSON对象JSONObject jsonObject1 = JSONObject.parseObject(stuString);System.out.println(jsonObject1);
5.list对象转listJson
-
ArrayList<Student> studentLsit = new ArrayList<>();
-
Student student1 = new Student();
-
student1.setId(1);
-
student1.setAge("20");
-
student1.setName("asdasdasd");
-
studentLsit.add(student1);
-
Student student2 = new Student();
-
student2.setId(2);
-
student2.setAge("20");
-
student2.setName("aaaa:;aaa");
-
studentLsit.add(student2);
-
//list转json字符串
-
String string = JSON.toJSON(studentLsit).toString();
-
System.out.println(string);
-
//json字符串转listJson格式
-
JSONArray jsonArray = JSONObject.parseArray(string);
-
System.out.println(jsonArray);