JSON转换实体类
1. 使用Jackson库
public class User {private String name;private int age;// getters and setters
}
import com.fasterxml.jackson.databind.ObjectMapper;public class JsonDemo {public static void main(String[] args) {String json = "{\"name\":\"John\", \"age\":30}";ObjectMapper mapper = new ObjectMapper();try {User user = mapper.readValue(json, User.class);System.out.println(user.getName());} catch (IOException e) {e.printStackTrace();}}
}
2. 使用Gson库
<dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.6</version>
</dependency>
public class User {private String name;private int age;// getters and setters
}
import com.google.gson.Gson;public class JsonDemo {public static void main(String[] args) {String json = "{\"name\":\"John\", \"age\":30}";Gson gson = new Gson();User user = gson.fromJson(json, User.class);System.out.println(user.getName());}
}
3. 使用Fastjson库
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>2.0.15</version>
</dependency>
public class User {private String name;private int age;// getters and setters
}
import com.alibaba.fastjson.JSON;public class JsonDemo {public static void main(String[] args) {String json = "{\"name\":\"John\", \"age\":30}";User user = JSON.parseObject(json, User.class);System.out.println(user.getName());}
}
4.在线工具
此外，还有一些在线工具可以帮助你将JSON转换为Java实体类，例如：
- JSON中文网的在线JSON转JavaBean工具
https://www.json.cn/json2java/
这些工具和库可以帮助开发者更方便地将JSON数据转换为Java对象，从而简化数据处理过程。
实体类转换JSON
1. 使用Jackson库
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.13.0</version>
</dependency>
public class User {private String name;private int age;// getters and setters
}
import com.fasterxml.jackson.databind.ObjectMapper;public class JsonDemo {public static void main(String[] args) {User user = new User();user.setName("John");user.setAge(30);ObjectMapper mapper = new ObjectMapper();try {String json = mapper.writeValueAsString(user);System.out.println(json);} catch (IOException e) {e.printStackTrace();}}
}
2. 使用Gson库
<dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.6</version>
</dependency>
public class User {private String name;private int age;// getters and setters
}
import com.google.gson.Gson;public class JsonDemo {public static void main(String[] args) {User user = new User();user.setName("John");user.setAge(30);Gson gson = new Gson();String json = gson.toJson(user);System.out.println(json);}
}
3. 使用Fastjson库
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>2.0.15</version>
</dependency>
public class User {private String name;private int age;// getters and setters
}
import com.alibaba.fastjson.JSON;public class JsonDemo {public static void main(String[] args) {User user = new User();user.setName("John");user.setAge(30);String json = JSON.toJSONString(user);System.out.println(json);}
}
4.在线工具
此外，还有一些在线工具可以帮助你将Java实体类转换为JSON，例如：
- JSON中文网的在线JavaBean转JSON工具https://www.json.cn/json2java/
这些工具和库可以帮助开发者更方便地将Java对象转换为JSON字符串，从而简化数据传输和存储过程。
