Jackson简单使用

1. Person.java

package pojo;

public class Person {
	private String id;
	private String name;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

2. JSONUtil.java

package util;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JSONUtil {
	public static String getJSONString(Object obj){
		ObjectMapper objectMapper = new ObjectMapper();
		try {
			
			return objectMapper.writeValueAsString(obj);
			// 格式化打印
//			return objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
		} catch (JsonProcessingException e) {
			throw new RuntimeException(e);
		}
	}
	
	public static <T> T getObjectFromJSONString(String json,Class<T> clazz){
		ObjectMapper objectMapper = new ObjectMapper();
		try {
			return objectMapper.readValue(json, clazz);
		} catch (JsonParseException e) {
			throw new RuntimeException(e);
		} catch (JsonMappingException e) {
			throw new RuntimeException(e);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
}

3. Main.java 测试类

package test;
import pojo.Person;
import util.JSONUtil;
public class Main {

	public static void main(String[] args) throws Exception {
		Person person = new Person();
		person.setId("001");
		person.setName("name");
		
		String str = JSONUtil.getJSONString(person);
		
		Person person2 = JSONUtil.getObjectFromJSONString(str, Person.class);
		System.out.println(person2);
	}
}