jgit diff (두 버 전 비교)

package jgit.diff;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.ListBranchCommand;
import org.eclipse.jgit.api.ResetCommand.ResetType;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.EditList;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.FileRepository;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.TreeWalk;
/*
 * 
 * Child     
 * Parent     
 */
public class JgitDiff {
	
	public JgitDiff() {
	}
	static String URL="D:/cfrManage/ConfigFile/.git";
	static Git git;
	public static Repository repository;
	public static void main(String[] args) {
		JgitDiff jgitDiff = new JgitDiff();
		
		jgitDiff.diffMethod("Child","Parent");
	}
	/*
	 * 
	 */
	public void diffMethod(String Child, String Parent){
		try {
			git=Git.open(new File("D:/cfrManage/ConfigFile/.git"));
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		repository=git.getRepository();
		ObjectReader reader = repository.newObjectReader();
		CanonicalTreeParser oldTreeIter = new CanonicalTreeParser();
	
		try {
			ObjectId old = repository.resolve(Child + "^{tree}");
			ObjectId head = repository.resolve(Parent+"^{tree}");
					oldTreeIter.reset(reader, old);
			CanonicalTreeParser newTreeIter = new CanonicalTreeParser();
			newTreeIter.reset(reader, head);
			List diffs= git.diff()
                    .setNewTree(newTreeIter)
                    .setOldTree(oldTreeIter)
                    .call();
			
			 ByteArrayOutputStream out = new ByteArrayOutputStream();
			    DiffFormatter df = new DiffFormatter(out);
			    df.setRepository(git.getRepository());
			
			for (DiffEntry diffEntry : diffs) {
		         df.format(diffEntry);
		         String diffText = out.toString("UTF-8");
		         System.out.println(diffText);
		       //  out.reset();
			}
		} catch (IncorrectObjectTypeException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (GitAPIException e) {
			e.printStackTrace();
		}
	}
}