json-lib, fasterxml.jackson JSON 변환/역변환 차이점

json-lib, com.fasterxml.jackson 둘의 차이점을 비교해본다.

별다른 옵션 없는 심플한 상황이다.

json-lib의 경우 Object형의 NULL 변환에 문제가 있어보인다.

[JsonTest .java]

import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;

import java.io.IOException;

import org.junit.Test;

import com.fasterxml.jackson.databind.ObjectMapper;

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

public class JsonTest {
	@Test
	public void test_jsonlib_BeanCase() {
		try {
			TestBean inBean = new TestBean();
			inBean.setA("a Value");
			inBean.setB("");
			inBean.setC(null);
			//inBean.setD();
			
			inBean.setInt11(1);
			//inBean.setInt12();
			inBean.setInt21(1);
			inBean.setInt21(null);
			
			inBean.setBool11(true);
			//inBean.setBool12();
			inBean.setBool21(true);
			inBean.setBool21(null);
			
			JSONObject jsonObj = JSONObject.fromObject( JSONSerializer.toJSON(inBean) );
			String jsonStr = jsonObj.toString();
			System.out.println("jsonStr: " + jsonStr);
			
			jsonObj = (JSONObject) JSONObject.fromObject(jsonStr);
			TestBean outBean = (TestBean) JSONObject.toBean(jsonObj, TestBean.class);
			System.out.println(outBean);
			
			assertEquals(inBean.getA(), outBean.getA());
			assertEquals(inBean.getB(), outBean.getB());
			//assertEquals(inBean.getC(), outBean.getC());				// 문제 소지
			//assertEquals(inBean.getD(), outBean.getD());				// 문제 소지
			
			assertEquals(outBean.getC(), "");
			assertEquals(outBean.getD(), "");
			
			assertEquals(inBean.getInt11(), outBean.getInt11());
			assertEquals(inBean.getInt12(), outBean.getInt12());
			//assertEquals(inBean.getInt21(), outBean.getInt21());		// 문제 소지(아예 변환 안됨)
			//assertEquals(inBean.getInt22(), outBean.getInt22());		// 문제 소지(아예 변환 안됨)
			assertEquals(outBean.getInt21(), new Integer(0));
			assertEquals(outBean.getInt22(), new Integer(0));
			
			assertEquals(inBean.isBool11(), outBean.isBool11());
			assertEquals(inBean.isBool12(), outBean.isBool12());
			//assertEquals(inBean.getBool21(), outBean.getBool21());	// 문제 소지(아예 변환 안됨)
			//assertEquals(inBean.getBool22(), outBean.getBool22());	// 문제 소지(아예 변환 안됨)
			assertEquals(outBean.getBool21(), new Boolean(false));
			assertEquals(outBean.getBool22(), new Boolean(false));
		} catch (Exception e) {
			System.err.println("-- e: " + e);
		}
		
	}
	
	@Test
	public void test_jackson_BeanCase() {
		try {
			ObjectMapper jacksonMapper = new ObjectMapper();
			
			TestBean inBean = new TestBean();
			inBean.setA("a Value");
			inBean.setB("");
			inBean.setC(null);
			//inBean.setD();
			
			inBean.setInt11(1);
			//inBean.setInt12();
			inBean.setInt21(1);
			inBean.setInt21(null);
			
			inBean.setBool11(true);
			//inBean.setBool12();
			inBean.setBool21(true);
			inBean.setBool21(null);
			System.out.println(inBean);
			
			String jsonStr = jacksonMapper.writeValueAsString(inBean);
			System.out.println("jsonStr: " + jsonStr);
			TestBean outBean = jacksonMapper.readValue(jsonStr, TestBean.class);
			
			assertEquals(inBean.getA(), outBean.getA());
			assertEquals(inBean.getB(), outBean.getB());
			assertEquals(inBean.getC(), outBean.getC());
			assertEquals(inBean.getD(), outBean.getD());
			assertEquals(outBean.getC(), null);
			assertEquals(outBean.getD(), null);
			
			assertEquals(inBean.getInt11(), outBean.getInt11());
			assertEquals(inBean.getInt12(), outBean.getInt12());
			assertEquals(inBean.getInt21(), outBean.getInt21());
			assertEquals(inBean.getInt22(), outBean.getInt22());
			
			assertEquals(inBean.isBool11(), outBean.isBool11());
			assertEquals(inBean.isBool12(), outBean.isBool12());
			assertEquals(inBean.getBool21(), outBean.getBool21());
			assertEquals(inBean.getBool22(), outBean.getBool22());
		} catch (IOException e) {
			System.err.println("-- e: " + e);
		}
	}
}

[TestBean.java]

import lombok.Getter;
import lombok.Setter;

@Setter @Getter
public class TestBean {
	String a;
	String b;
	String c;
	String d;
	
	int int11;
	int int12;
	Integer int21;
	Integer int22;
	
	boolean bool11;
	boolean bool12;
	Boolean bool21;
	Boolean bool22;
}

[build.gradle]

sourceCompatibility='1.7'

dependencies {
    //compile group: 'commons-collections', name: 'commons-collections', version: '3.2'
    //compile 'org.apache.maven.plugins:maven-war-plugin:+'
    
    compile 'net.sf.json-lib:json-lib:2.4:jdk15@jar'
    compile 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.6.4'
    
    compile 'commons-lang:commons-lang:2.6'
    compile 'commons-logging:commons-logging:1.2'
    compile 'commons-collections:commons-collections:3.2.2'
    compile 'commons-beanutils:commons-beanutils:1.9.2'
    compile 'net.sf.ezmorph:ezmorph:1.0.6'
    
    testCompile 'junit:junit:4.11'
	testCompile 'org.hamcrest:hamcrest-all:1.3'
}