tcp问题

package day18;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

/**
 * 客户端键盘录入，服务器输出文本文件（自己练习）
 * @author 大油桑
 *
 */
public class TcpClientTest1 {

    public static void main(String[] args) throws Exception {

        Scanner sc = new Scanner(System.in);
        Socket s = new Socket("大油桑",9999);
//      BufferedWriter bw=null;
        while(true) {
            String line = sc.nextLine();
            if("886".equals(line)) {
                break;
            }else {
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
                bw.write(line);
//              bw.newLine();
                bw.flush();
            }
        }
        s.close();

    }

}

package day18;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServerTest1 {

    public static void main(String[] args) throws Exception {
        ServerSocket ss = new ServerSocket(9999);
        // BufferedReader br = null;
        while (true) {

            Socket accept = ss.accept();
            BufferedReader br = new BufferedReader(new InputStreamReader(accept.getInputStream()));
            // String content;
            // BufferedOutputStream bw = null;
            // while ((content = br.readLine()) != null) {
            // System.out.println(br.readLine());
            BufferedOutputStream bw = new BufferedOutputStream(new FileOutputStream("D:/aa/txtxt.txt", true));
            bw.write((br.readLine() + "\r\n").getBytes());

            bw.close();
            // bw.flush();
            // }
            accept.close();
            ss.close();
        }

    }

}

错误出现的位置不对，为什么？