TCP编程 下载电子书 IO流读取文件，传输文件过程

IO流读取文件，传输文件过程
服务器：SreverUtil类

package com.lanou.homework.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class SreverUtil {

	public void start() {
		Socket s=null;
		try {
			ServerSocket socket = new ServerSocket(10086);
			s = socket.accept();
			File[] f = getFiles();
			sendFileList(s,f);
			int num=getBookNum(s);
			sendFileContent(s,f,num);
			
			
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			this.close(s);
		}
	}

	private File[] getFiles() {
		File f = new File("F:/电子书");
		if (!f.exists()) {
			return null;
		}
		if (!f.isDirectory()) {
			return null;
		}
		return f.listFiles();
	}
	private void sendFileList(Socket s,File[] f) {
		try {
			PrintWriter pw = new PrintWriter(s.getOutputStream());
			if (f == null) {
				pw.println("终止");
				pw.flush();
				return;
			}else {
				for (int i = 0; i < f.length; i++) {
					pw.println(i+":"+f[i].getName());
					pw.flush();
				}
				pw.println("终止");
				pw.flush();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	private int getBookNum(Socket s) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			String str = br.readLine();
			Integer result = Integer.parseInt(str);
			return result;
		} catch (IOException e) {
			e.printStackTrace();
		}
		return -1;
	}
	private void sendFileContent(Socket s,File[] f,int num) {
		PrintWriter pw  = null;
		BufferedReader br = null;
		try {
			pw = new PrintWriter(s.getOutputStream());
			br = new BufferedReader(new FileReader(f[num]));
			String str ;
			while((str=br.readLine())!=null) {
				pw.println(str);
				pw.flush();
			}
			pw.println("完毕");
			pw.flush();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				br.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}
	public void close(Socket s) {
		try {
			s.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

客户端：ClientUtil类

package com.lanou.homework.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class ClientUtil {
	
	public void start() {
		Socket s=null;
		try {
			s =new Socket("127.0.0.1",10086);
			receiveFileList(s);
			sendFileNum( s,getFileNum());
			ReciveFileContent(s);
			
			
			
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	private void receiveFileList(Socket s) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			String str;
			while(!(str=br.readLine()).equals("终止")) {
				System.out.println(str);
			}
			
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	private int getFileNum() {
		System.out.println("请输入编号：");
		Scanner scanner = new Scanner(System.in);
		return scanner.nextInt();
	}
	private void sendFileNum(Socket s,int num) {
		try {
			PrintWriter pw = new PrintWriter(s.getOutputStream());
			pw.println(num);
			pw.flush();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	private void ReciveFileContent(Socket s) {
		BufferedReader br;
		try {
			br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			String str;
			while(!(str=br.readLine()).equals("完毕")) {
				System.out.println(str);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
}

调用：TCPServer

package com.lanou.homework;
import com.lanou.homework.util.SreverUtil;

public class TCPServer {
	public static void main(String[] args) {
		SreverUtil ss = new SreverUtil();
		ss.start();

	}
}

调用：TCPClient

package com.lanou.homework;
import com.lanou.homework.util.ClientUtil;

public class TCPClient {
	public static void main(String[] args) {
		ClientUtil cu = new ClientUtil();
		cu.start();
		}

}