Web开发笔记 #08# Jackson组合多个对象的属性构成JSON(以及添加自定义属性)

时间:2021-05-19 08:51:31

参考文档:https://github.com/FasterXML/jackson-databind

关于ObjectMapper的线程安全

截自官方文档:

Web开发笔记 #08# Jackson组合多个对象的属性构成JSON(以及添加自定义属性)

组合多个对象的属性构成JSON(以及添加自定义属性)

Code:

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode; public class TestJackson { private static final ObjectMapper MAPPER = new ObjectMapper(); public static void main(String[] args) {
Foo foo = new Foo("value1", "value2");
Bar bar = new Bar("value3", "value4");
ObjectNode root = MAPPER.valueToTree(foo);
ObjectNode node = MAPPER.valueToTree(bar);
root.setAll(node);
root.put("extraFiled", "value5");
String jsonString = null;
try {
jsonString = MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(root);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
System.out.println(jsonString);
}
}

Output:

Web开发笔记 #08# Jackson组合多个对象的属性构成JSON(以及添加自定义属性)

PS. 单词打错:filed => field