基本チュートリアル: Java で多次元 JSON 配列を処理するスキルをマスターします。

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

{
  "students": [
    {
      "name": "张三",
      "age": 18,
      "courses": [
        {
          "name": "数学",
          "score": 90
        },
        {
          "name": "语文",
          "score": 85
        }
      ]
    },
    {
      "name": "李四",
      "age": 20,
      "courses": [
        {
          "name": "英语",
          "score": 95
        },
        {
          "name": "物理",
          "score": 88
        }
      ]
    }
  ]
}

String json = "{...}"; // 假设这里是上述JSON数据
Gson gson = new Gson();
JsonObject jsonObject = gson.fromJson(json, JsonObject.class);

JsonArray students = jsonObject.getAsJsonArray("students");
for (JsonElement studentElement : students) {
    JsonObject studentObj = studentElement.getAsJsonObject();
    String name = studentObj.get("name").getAsString();
    int age = studentObj.get("age").getAsInt();
    System.out.println("姓名：" + name + "，年龄：" + age);
}

JsonArray students = jsonObject.getAsJsonArray("students");
for (JsonElement studentElement : students) {
    JsonObject studentObj = studentElement.getAsJsonObject();
    String name = studentObj.get("name").getAsString();
    JsonArray courses = studentObj.getAsJsonArray("courses");
    for (JsonElement courseElement : courses) {
        JsonObject courseObj = courseElement.getAsJsonObject();
        String courseName = courseObj.get("name").getAsString();
        int score = courseObj.get("score").getAsInt();
        System.out.println("姓名：" + name + "，课程：" + courseName + "，成绩：" + score);
    }
}

class Student {
    private String name;
    private int age;
    private List<Course> courses;
    
    // getter和setter方法
}

class Course {
    private String name;
    private int score;
    
    // getter和setter方法
}

JsonArray students = jsonObject.getAsJsonArray("students");
List<Student> studentList = new ArrayList<>();
for (JsonElement studentElement : students) {
    JsonObject studentObj = studentElement.getAsJsonObject();
    String name = studentObj.get("name").getAsString();
    int age = studentObj.get("age").getAsInt();
    JsonArray courses = studentObj.getAsJsonArray("courses");
    List<Course> courseList = new ArrayList<>();
    for (JsonElement courseElement : courses) {
        JsonObject courseObj = courseElement.getAsJsonObject();
        String courseName = courseObj.get("name").getAsString();
        int score = courseObj.get("score").getAsInt();
        Course course = new Course();
        course.setName(courseName);
        course.setScore(score);
        courseList.add(course);
    }
    Student student = new Student();
    student.setName(name);
    student.setAge(age);
    student.setCourses(courseList);
    studentList.add(student);
}