常用的将Java的String字符串转具体对象的几种方式

Java对象以User.class为例，注意：代码中使用到了lombok的@Data注解

package com.example.entity;

import lombok.Data;

@Data
public class User {

    // 姓名
    private String name;

    // 年龄
    private int age;
}

1.Jsonlib解析器

依赖

		<!--json-lib-->
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>

字符串转对象-代码展示

package com.example.demo;

import com.example.entity.User;
import net.sf.json.JSONObject;

public class TestA {

    public static void main(String[] args) throws Exception {
        String objectStr = "{\"name\":\"张三\",\"age\":\"18\"}";
        //1、使用JSONObject
        JSONObject jsonObject = JSONObject.fromObject(objectStr);
        User user = (User) JSONObject.toBean(jsonObject, User.class);
        System.out.println("name:" + user.getName());
        System.out.println("age:" + user.getAge());
    }

}

打印截图示例

延伸（对象转String）代码展示

package com.example.demo;

import com.example.entity.User;
import net.sf.json.JSONObject;

public class TestA {

    public static void main(String[] args) throws Exception {
        User user = new User();
        user.setName("张三");
        user.setAge(18);

        // 1.对象转JSONObject
        JSONObject json = JSONObject.fromObject(user);
        // 2.JSONObject转String
        String strJson = json.toString();
        System.out.println(strJson);
    }

}

延伸（对象转String）运行截图

2.fastjson解析器

依赖

		<!-- fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.75</version>
        </dependency>

字符串转对象-代码展示

package com.example.demo;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.example.entity.User;

public class TestA {

    public static void main(String[] args) throws Exception {
        String objectStr = "{\"name\":\"张三\",\"age\":\"18\"}";
        JSONObject jsonObject = JSON.parseObject(objectStr);
        User user = JSON.toJavaObject(jsonObject, User.class);
        System.out.println("name:" + user.getName());
        System.out.println("age:" + user.getAge());

    }

}

打印截图示例

延伸（对象转String）代码展示

package com.example.demo;

import com.alibaba.fastjson.JSON;
import com.example.entity.User;

public class TestA {

    public static void main(String[] args) throws Exception {
        User user = new User();
        user.setName("张三");
        user.setAge(18);

        String str = JSON.toJSONString(user);
        System.out.println(str);
    }

}

延伸（对象转String）运行截图

3.jackson解析器

依赖

		<!-- jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.7.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
            <version>2.7.1</version>
        </dependency>

字符串转对象-代码展示

package com.example.demo;

import com.example.entity.User;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TestA {

    public static void main(String[] args) throws Exception {
        String objectStr = "{\"name\":\"张三\",\"age\":\"18\"}";
        ObjectMapper om = new ObjectMapper();
        User user = om.readValue(objectStr, User.class);
        System.out.println("name:" + user.getName());
        System.out.println("age:" + user.getAge());
    }

}

打印截图示例

延伸（对象转String）代码展示

package com.example.demo;

import com.example.entity.User;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TestA {

    public static void main(String[] args) throws Exception {
        User user = new User();
        user.setName("张三");
        user.setAge(18);

        ObjectMapper om = new ObjectMapper();
        String str = om.writeValueAsString(user);
        System.out.println(str);
    }

}

延伸（对象转String）运行截图

4.Gson解析器

依赖

<!-- 谷歌依赖 -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.6</version>
        </dependency>

字符串转对象-代码展示

package com.example.demo;

import com.example.entity.User;
import com.google.gson.Gson;

public class TestA {

    public static void main(String[] args) throws Exception {
        String objectStr = "{\"name\":\"张三\",\"age\":\"18\"}";
        Gson gson = new Gson();
        User user = gson.fromJson(objectStr, User.class);
        System.out.println("name:" + user.getName());
        System.out.println("age:" + user.getAge());
    }

}

打印截图示例

延伸（对象转String）代码展示

package com.example.demo;

import com.example.entity.User;
import com.google.gson.Gson;

public class TestA {

    public static void main(String[] args) throws Exception {
        User user = new User();
        user.setName("张三");
        user.setAge(18);
        Gson gson = new Gson();

        String str = gson.toJson(user);
        System.out.println(str);
    }

}

延伸（对象转String）运行截图

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