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src/main/java/kr/co/swh/lecture/opensource/project/drawing/LineDraw.java

 
 
 import java.awt.BasicStroke;
-import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Point;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseMotionAdapter;
 import java.awt.geom.Line2D;
-import java.io.BufferedWriter;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 
 import javax.swing.JFrame;
 import javax.swing.JPanel;
-import javax.swing.JScrollPane;
-import javax.swing.JTextArea;
-import javax.swing.JTextField;
 
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
 	private List<List<Point>> drawingPoint = new ArrayList<List<Point>>();
 	private DataOutputStream drawingOutputStream;
 	private DrawingInputThread drawingInputThread;
+	private Gson gson = new Gson();;
 	
 	class DrawingInputThread extends Thread{
 		private Socket socket;
 				dis = new DataInputStream(socket.getInputStream());
 				while(true) {
 					String line = dis.readUTF();
-					Gson gson = new Gson();
 					drawingPoint = gson.fromJson(line, new TypeToken<List<List<Point>>>(){}.getType());
 					System.out.println(drawingPoint);
 					repaint();
 
 		addMouseMotionListener(new MouseMotionAdapter() {
 			public void mouseDragged(MouseEvent event) {
-				Point p = event.getPoint();
-				Gson gg = new Gson();
+				
 				point.get(point.size()-1).add(event.getPoint());
 //				repaint();
 				System.out.println("mouseDragged " + point.size());
 				try {
-					drawingOutputStream.writeUTF(gg.toJson(point));
+					drawingOutputStream.writeUTF(gson.toJson(point));
 				} catch (IOException e) {
 					// TODO Auto-generated catch block
 					e.printStackTrace();