基于Alibaba数据封装工具fastJsonの初体验

不得不说这种工具在进行数据封装的时候是真香，使用方法简便，封装功能强大。让我想到了以前GSON的使用，感觉还是阿里巴巴的产品香。

在maven中导入相关的坐标依赖

		<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.70</version>
        </dependency>

使用时候的Java代码

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author shiwen
 * @date 2020/7/9
 */
public class JsonDemo {

    public static void main(String[] args) {

        Student student1 = new Student(11, "学生1", 21);
        Student student2 = new Student(12, "学生1", 22);
        Student student3 = new Student(13, "学生1", 23);

        List students = new ArrayList<>();
        students.add(student1);
        students.add(student2);
        students.add(student3);

        List students2 = new ArrayList<>();
        students2.add(student1);
        students2.add(student2);
        students2.add(student3);

        // string转json格式，这个是String转json格式类型 ===== 这种是输入string类型的json格式会自动转为json格式
        System.out.println("stringToJson：" + JSON.parseObject("{\"age\":21,\"id\":11,\"name\":\"学生1\"}"));

        // JSON.toJSONString是对象转String的Json类型 ===== 这种是对象转json格式
        System.out.println(JSON.toJSONString("{\"age\":21,\"id\":11,\"name\":\"学生1\"}"));

        // 这里我们把list集合类型的数据封装成json的string字符串格式 =====
        // string转json格式
        System.out.println("stringToJson：" + JSON.toJSONString(students));

        // json转list集合
        List<Student> strArray = JSON.parseArray(JSON.toJSONString(students), Student.class);
        System.out.println("jsonToList：" + strArray);

        // 单一一个student对象转换成json格式
        System.out.println("entityToJson：" + JSON.toJSONString(student1));

        // 使用HashMap进行数据的封装
        Map<String, Object> map = new HashMap<>();
        map.put("student1", student1);
        map.put("student2", student2);
        map.put("studentList1", JSON.toJSONString(students));
        map.put("studentList2", JSON.toJSONString(students2));
        String jsonString = JSON.toJSONString(map);
        System.out.println("mapToJsonString：" + jsonString);

    }

}

class Student{

    private Integer id;
    private String name;
    private Integer age;

    public Student() {
    }

    public Student(Integer id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

}

输出结果

stringToJson：{"name":"学生1","id":11,"age":21}

"{\"age\":21,\"id\":11,\"name\":\"学生1\"}"

stringToJson：[{"age":21,"id":11,"name":"学生1"},{"age":22,"id":12,"name":"学生1"},{"age":23,"id":13,"name":"学生1"}]

jsonToList：[Student{id=11, name='学生1', age=21}, Student{id=12, name='学生1', age=22}, Student{id=13, name='学生1', age=23}]

entityToJson：{"age":21,"id":11,"name":"学生1"}

mapToJsonString：{"student2":{"age":22,"id":12,"name":"学生1"},"student1":{"age":21,"id":11,"name":"学生1"},"studentList2":"[{\"age\":21,\"id\":11,\"name\":\"学生1\"},{\"age\":22,\"id\":12,\"name\":\"学生1\"},{\"age\":23,\"id\":13,\"name\":\"学生1\"}]","studentList1":"[{\"age\":21,\"id\":11,\"name\":\"学生1\"},{\"age\":22,\"id\":12,\"name\":\"学生1\"},{\"age\":23,\"id\":13,\"name\":\"学生1\"}]"}