alibaba fastjson的基本转化方法

alibaba fastjson的基本转化方法

定义对象

class Student {
    private String username;
    private String password;

    public Student() {}

    public Student(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Student{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

Java对象 To JSON字符串

/*java对象转为字符串*/
Student student = new Student("admin","123456");
String jsonString = JSONObject.toJSONString(student);
System.out.println(jsonString);
// {"password":"123456","username":"admin"}

JSON字符串 To Java对象

//json字符串转为Java对象
Student s = JSONObject.parseObject("{\"password\":\"123456\",\"username\":\"admin\"}", Student.class);
System.out.println(s);

JSON字符串 To Map

//json字符串转为Map
Map map = JSONObject.parseObject("{\"password\":\"123456\",\"username\":\"admin\"}", Map.class);
System.out.println(map);
//{password=123456, username=admin}

Java List To JSON字符串

List<Student> students = new ArrayList<>();
for (int i = 0; i < 2; i++) {
    students.add(new Student("admin","admin-"+i));
}

String toJSONString = JSONObject.toJSONString(students);
System.out.println(toJSONString);
//[{"password":"admin-0","username":"admin"},{"password":"admin-1","username":"admin"}]

JSON字符串 To Java List

List<Student> ss = JSONObject.parseArray("[{\"password\":\"admin-0\",\"username\":\"admin\"},{\"password\":\"admin-1\",\"username\":\"admin\"}]", Student.class);
System.out.println(ss);
// [Student{username='admin', password='admin-0'}, Student{username='admin', password='admin-1'}]

JSON字符串 To Java ListMap

List<Map> listMap = JSONObject.parseArray("[{\"password\":\"admin-0\",\"username\":\"admin\"},{\"password\":\"admin-1\",\"username\":\"admin\"}]", Map.class);
System.out.println(listMap);
// [{password=admin-0, username=admin}, {password=admin-1, username=admin}]