我要评论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
以上就是常用的几种string转具体的java对象操作
总结
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