package com.ysk;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
public class Client {
  public static void main(String[] args) {
    try {
      Socket socket = new Socket("127.0.0.1", 5555);
      OutputStream os = socket.getOutputStream();// 字节输出流
      PrintWriter pw = new PrintWriter(os);
      pw.write("aa.txt");//输入需要搜索的文件名
      pw.flush();
      socket.shutdownOutput();
      BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
      String a = "";
      String temp = "";
      while ((temp = in.readLine()) != null) {
        a += temp;
      }
      PrintWriter out = new PrintWriter(new OutputStreamWriter(new FileOutputStream("src\\asb.txt")));
      out.write(a);
      out.flush();
      out.close();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
    }
  }
}

package com.ysk;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
  static ServerSocket serverSocket;
  public static void main(String[] args) {
    try {
      serverSocket = new ServerSocket(5555);
      System.out.println("***服务器即将启动，等待客户端的连接***");
      Socket socket = serverSocket.accept();
      BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
      String file = br.readLine();
      findFile("src", file);
      if (result) {
        System.out.println("已找到" + file);
        File f = new File(file);
//       File copyfile = new File("src\\file", "bb.txt");
        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(filepath + file)));
        System.out.println(filepath + file);
        String a = "";
        String temp = "";
        while ((temp = in.readLine()) != null) {
          a += temp;
        }
        PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
        out.write(a);
        out.flush();
        socket.shutdownOutput();
      } else {
        System.out.println("未找到文件");
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }