使用Gson实现对象或集合与json字符串的互相转化

﹏ヽ暗。殇╰゛Y 2022-05-15 17:46 445阅读 0赞

public class JsonTest {
        private static Gson gson = new Gson();
    
        public static Student jsonToObject(String jsonStr) {
            return gson.fromJson(jsonStr, Student.class);
        }
    
        public static List<Student> jsonToList(String jsonStr) {
            return gson.fromJson(jsonStr, new TypeToken<List<Student>>(){}.getType());
        }
    
        public String objectOrListToJson(Object object) {
            return gson.toJson(object);
        }
    
    
        public static void main(String[] args) {
            String jsonStr = "{\"id\":\"1\",\"name\":\"ji\",\"score\":\"100\"}";
            System.out.println(jsonToObject(jsonStr));
    
            String json = "[{\"id\":\"1\",\"name\":\"ji\",\"score\":\"100\"},{\"id\":\"2\",\"name\":\"liu\",\"score\":\"99\"}]";
            System.out.println(jsonToList(json));
    
            Student student = new Student(3, "liu", 100);
            System.out.println(gson.toJson(student));
    
            List<Student> students = new ArrayList<>();
            students.add(new Student(4, "ying", 99));
            students.add(new Student(5, "bing", 98));
            System.out.println(gson.toJson(students));
        }
    
        static class Student {
            int id;
            String name;
            int score;
    
            public Student(int id, String name, int score) {
                this.id = id;
                this.name = name;
                this.score = score;
            }
    
            public int getId() {
                return id;
            }
    
            public void setId(int id) {
                this.id = id;
            }
    
            public String getName() {
                return name;
            }
    
            public void setName(String name) {
                this.name = name;
            }
    
            public int getScore() {
                return score;
            }
    
            public void setScore(int score) {
                this.score = score;
            }
    
            @Override
            public String toString() {
                return "Student{" +
                        "id=" + id +
                        ", name='" + name + '\'' +
                        ", score=" + score +
                        '}';
            }
        }
    }