ddakker님의 블로그

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'
}

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;

/**
 * DB 아니고 외부 인터페이스에서 받아온 정보
 * @auther ddakker 2013. 6. 12.
 */
public class ExternalBean {

	private String resultCode;
	private String errMsg;

	private Map header;
	private List<Map> resultList;
	public String getResultCode() {
		return resultCode;
	}
	public void setResultCode(String resultCode) {
		this.resultCode = resultCode;
	}
	public String getErrMsg() {
		return errMsg;
	}
	public void setErrMsg(String errMsg) {
		this.errMsg = errMsg;
	}
	public Map getHeader() {
		return header;
	}
	public void setHeader(Map header) {
		this.header = header;
	}
	public List<Map> getResultList() {
		return resultList;
	}
	public void setResultList(List<Map> resultList) {
		this.resultList = resultList;
	}

	/**
	 * 헤더 정보를 특정 Bean에 담아 리턴한다.
	 * @param clz
	 * @return
	 * @auther ddakker 2013. 6. 14.
	 */
	public <T> T getHeader(Class<T> clz) {
		Object objBean = null;
		try{
			objBean = clz.newInstance();
			BeanUtils.copyProperties(objBean, header);

			return (T) objBean;
		}catch(Exception e){
			throw ExceptionManager.createException("JSON 데이터를 Bean으로 맵핑[Header]하는 도중 에러가 발생하였습니다." + e);
		}
	}

	/**
	 * 배열 정보를 특정 List<Bean>에 담아 리턴한다.
	 * @param clz
	 * @return
	 * @auther ddakker 2013. 6. 14.
	 */
	public <T> List<T> getResultList(Class<T> clz) {
		List<T> list = new ArrayList<T>();
		try{
			Object objBean;
			for( Map map : resultList ){
				objBean = clz.newInstance();
				BeanUtils.copyProperties(objBean, map);

				list.add((T) objBean);
			}
		}catch(Exception e){
			throw ExceptionManager.createException("JSON 데이터를 Bean으로 맵핑[ResultList]하는 도중 에러가 발생하였습니다." + e);
		}
		return list;
	}
}

public class UserHeaderBean {
	private String userNm;

	public String getUserNm() {
		return userNm;
	}

	public void setUserNm(String userNm) {
		this.userNm = userNm;
	}
}

public class ListBean {
	private String dlvrAddr1;
	
	public String getDlvrAddr1() {
		return dlvrAddr1;
	}
}

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

public class TestCase {
        @Test
	public void jsonTestCase() {
		String jsonStr = "{'resultCode':'success', 'errorMsg': '','header':{'userNm':'ddakker'},'resultList':[{'dlvrAddr1': '서울~'},{'dlvrAddr1': '충남~'}]}";
		
		Map classMap = new HashMap();
		classMap.put("header", HashMap.class);
		classMap.put("resultList", HashMap.class);

		JSONObject json = JSONObject.fromObject(jsonStr);

		ExternalBean exBean = (ExternalBean) JSONObject.toBean(json, ExternalBean.class, classMap);
		
		if( exBean.getResultCode().equals("success") ){
			UserHeaderBean hBean = exBean.getHeader(UserHeaderBean.class);
			System.out.println(hBean.geUserNm());
								
			List<ListBean> lBeanList = exBean.getResultList(ListBean.class);
			System.out.println(lBeanList.size());
			System.out.println(lBeanList.get(0).getDlvrAddr1());
		}
	}
}