java json对象和json字符串互转的方法_js中对象转字符串的方法开发者社区

java json对象和json字符串互转的方法_js中对象转字符串的方法

//json字符串-简单对象
String jsonStr = "{\"studentName\":\"张三\",\"studentAge\":18}";
//json字符串-数组类型
String  jsonArrStr = "[{\"studentName\":\"张三\",\"studentAge\":18},{\"studentName\":\"李四\",\"studentAge\":17}]";
//json字符串-复杂对象
String  complexJsonStr= "{\"teacherName\":\"李寻欢\",\"teacherAge\":30,\"course\":{\"courseName\":\"武术\",\"code\":110},
                     \"students\":[{\"studentName\":\"张三\",\"studentAge\":18},{\"studentName\":\"李四\",\"studentAge\":19}]}";

JSONObject jsonObj = JSON.parseObject(jsonStr);

JSONArray jsonArray = JSON.parseArray(jsonArrStr);
//遍历JSONArray方法1
for(int i = 0; i < jsonArray.size(); i++){
   JSONObject jsonObj = jsonArray.getJSONObject(i); 
//遍历JSONArray方法2
for(Object obj : jsonArray){
    JSONObject jsonObject = (JSONObject) obj;
}

JSONObject jsonObj = JSON.parseObject(complexJsonStr);
//取出复杂对象中各项内容
String teacherName = jsonObj.getString("teacherName");
Integer teacherAge = jsonObj.getInteger("teacherAge");
JSONObject course = jsonObj.getJSONObject("course");
JSONArray students = jsonObj.getJSONArray("students");

JSONObject jsonObj = new JSONObject();
//JSONObject到JSON字符串的转换
String jsonStr = jsonObj.toJSONString();

// 方法1
Student student = JSON.parseObject(jsonStr , new TypeReference<Student>() {});
// 方法2
Student student = JSON.parseObject(jsonStr , Student.class);

ArrayList<Student> students = JSON.parseObject(jsonArrStr, new TypeReference<ArrayList<Student>>() {});
for (Student student : students) {
   System.out.println(student.getStudentName()+":"+student.getStudentAge());
}

Teacher teacher = JSON.parseObject(complexJsonStr, new TypeReference<Teacher>() {});
//获取teacher中的内容
String teacherName = teacher.getTeacherName();
Integer teacherAge = teacher.getTeacherAge();
Course course = teacher.getCourse();
List<Student> students = teacher.getStudents();

Teacher teacher = new Teacher();

java json对象和json字符串互转的方法_js中对象转字符串的方法

java json对象和json字符串互转的方法_js中对象转字符串的方法

一、准备工作

二、json字符串、json对象、java对象的转换方法