简单实现_实体类与Json字符串互相转换

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一、Jackson方式

1、实体类

public class Person {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

}

2、实体类转为Json

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Test {
    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();

        System.out.println("=============实体类转为Json=============");
        Person person = new Person();
        person.setAge(15);
        person.setName("小明");
        String result = mapper.writeValueAsString(person);
        System.out.println(result);

        System.out.println("=============Json转为实体类=============");
        String str = "{\"name\":\"小明\",\"age\":15}";
        Person person1 = mapper.readValue(str, Person.class);
        System.out.println("姓名为:" + person1.getName() + "，年龄为：" + person1.getAge());
    }
}

3、运行结果

4、Spring boot中使用

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;

public class Test {
    
    @Autowired
    private ObjectMapper mapper;

    public void test() throws JsonProcessingException {
        System.out.println("=============实体类转为Json=============");
        Person person = new Person();
        person.setAge(15);
        person.setName("小明");
        String result = mapper.writeValueAsString(person);
        System.out.println(result);

        System.out.println("=============Json转为实体类=============");
        String str = "{\"name\":\"小明\",\"age\":15}";
        Person person1 = mapper.readValue(str, Person.class);
        System.out.println("姓名为:" + person1.getName() + "，年龄为：" + person1.getAge());
    }
}

二、FastJson方式

1)、案例

1、Pom.xml

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.76</version>
</dependency>

2、实体类

public class Person {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

3、实体类与Json转换

import com.alibaba.fastjson.JSON;

public class Test {
    public static void main(String[] args) {

        System.out.println("=============实体类转为Json=============");
        Person person = new Person();
        person.setAge(15);
        person.setName("小明");
        String result = JSON.toJSONString(person);
        System.out.println(result);

        System.out.println("=============Json转为实体类=============");
        String str = "{\"name\":\"小明\",\"age\":15}";
        Person person1 = JSON.parseObject(str, Person.class);
        System.out.println("姓名为:" + person1.getName() + "，年龄为：" + person1.getAge());
    }
}

4、运行结果