DataOutputStreamのループ中に通信が切れてしまう

import java.io.DataOutputStream;
import java.net.Socket;
/*
 * SocketClient.java
 *
 * Created on 2004/10/04, 0:16
 */

/**
 *
 * @author  kei moses kissinger
 */
public class SocketClient {
	public static void main(String[] args) {
		try {
		new SocketClient();
		
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
	
	/** Creates a new instance of SocketClient */
	public SocketClient() throws Exception {
		java.util.Date date1_u = null;
		java.util.Date date2_u = null;
		long time_u = 0; // intを longにした
		int roop_unit = 1000000;//ループを行う回数
		int roop_count = 0;
		int portNo = 2100;//ポート番号
	//	String hostName = getCodeBase().getHost();//ホスト名
	//	String hostName = "localhost";
		String hostName = "192.168.1.128";
		
		Socket server = new Socket(hostName,portNo);
		DataOutputStream out = new DataOutputStream(server.getOutputStream());
		date1_u = new java.util.Date();
		while (roop_count < roop_unit) {
		//	out.writeBytes("1");
			out.writeUTF("1");
			roop_count++;
		}
		System.out.println(roop_count);
		date2_u = new java.util.Date();
		time_u = date2_u.getTime() - date1_u.getTime();//動作時間取得
	}
	
}

/*
 * Main.java
 *
 * Created on 2004/10/04, 0:11
 */

package matsuonserver;

import java.io.DataInputStream;
import java.net.ServerSocket;
import java.net.Socket;

/**
 *
 * @author  kei moses kissinger
 */
public class SocketServer {
	public static void main(String args[]) {
		int pNo = 2100;
		ServerSocket server = null;
		Socket client = null;
		DataInputStream fromClient = null;
		String mozi = null;
		try {
			server = new ServerSocket(pNo);
			client = server.accept();
			fromClient = new DataInputStream(client.getInputStream());
			
			while(true){
				mozi=fromClient.readUTF();
				System.out.print(mozi);
			}
		}catch(Exception e){
			e.printStackTrace();
		//	System.out.println("Exception e "+e);
			if(fromClient != null){
				fromClient = null;
			}
			if(client != null){
				client = null;
			}
			if(server != null){
				server = null;
			}
		}
	}
}