简单实现_实体类与Json字符串互相转换

偏执的太偏执、 2023-10-05 09:46 1阅读 0赞

### 文章目录 ###

*   *  一、Jackson方式
     *   *   *  1、实体类
             *  2、实体类转为Json
             *  3、运行结果
             *  4、Spring boot中使用
     *  二、FastJson方式
     *   *  1)、案例
         *   *  1、Pom.xml
             *  2、实体类
             *  3、实体类与Json转换
             *  4、运行结果

--------------------

## 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 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw_size_16_color_FFFFFF_t_70_pic_center]

#### 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 ####

#### 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 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw_size_16_color_FFFFFF_t_70_pic_center 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/20210604133835339.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw==,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw_size_16_color_FFFFFF_t_70_pic_center 1]: https://img-blog.csdnimg.cn/20210604133953511.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDExNw==,size_16,color_FFFFFF,t_70#pic_center