1 package cn.itcast_15;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.FileReader;
 6 import java.io.IOException;
 7 import java.io.InputStreamReader;
 8 import java.io.OutputStreamWriter;
 9 import java.net.Socket;
10 
11 public class UploadClient {
12     public static void main(String[] args) throws IOException {
13         // 创建客户端Socket对象
14         Socket s = new Socket("192.168.40.9", 11111);
15 
16         // 封装文本文件
17         BufferedReader br = new BufferedReader(new FileReader("src//cn//itcast_15//a.txt"));
18         
19         // 封装通道内的流对象
20         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
21 
22         String line = null;
23         while ((line = br.readLine()) != null) { // 阻塞
24             bw.write(line);
25             bw.newLine();
26             bw.flush();
27         }
28 
29         // Socket提供了一个终止，它会通知服务器你别等了，我没有数据过来了
30         s.shutdownOutput();
31 
32         // 接收反馈
33         BufferedReader brClient = new BufferedReader(new InputStreamReader(
34                 s.getInputStream()));
35         String client = brClient.readLine(); // 阻塞
36         System.out.println(client);
37 
38         // 释放资源
39         br.close();
40         s.close();
41     }
42 }

 1 package cn.itcast_15;
 2 
 3 import java.io.IOException;
 4 import java.net.ServerSocket;
 5 import java.net.Socket;
 6 
 7 public class UploadServer {
 8     public static void main(String[] args) throws IOException {
 9         // 创建服务器Socket对象
10         ServerSocket ss = new ServerSocket(11111);
11 
12         while (true) {
13             Socket s = ss.accept(); // 监听客户端连接
14             new Thread(new UserThread(s)).start();
15         }
16     }
17     
18 }

 1 package cn.itcast_15;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.FileWriter;
 6 import java.io.IOException;
 7 import java.io.InputStreamReader;
 8 import java.io.OutputStreamWriter;
 9 import java.net.Socket;
10 
11 public class UserThread implements Runnable {
12     
13     private Socket s;
14 
15     public UserThread(Socket s) {
16         this.s = s;
17     }
18 
19     @Override
20     public void run() {
21         try {
22             // 封装通道内的流对象
23             BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
24             
25             // 封装文本文件对象
26             // BufferedWriter bw = new BufferedWriter(new FileWriter("src//cn//itcast_15//Copy.java"));
27 
28             // 为了防止名称冲突(即为了防止所有文件的名字都一样)
29             String newName = System.currentTimeMillis() + ".txt";
30             BufferedWriter bw = new BufferedWriter(new FileWriter("src//cn//itcast_15//" + newName));
31             // 如果在某一时间点，同时有很多人访问服务器，相同名字的文件也会出现很多，肿么办? 答：再加循环判断，一旦某个名字存在，就重新赋值另一名字即可。
32 
33             String line = null;
34             while ((line = br.readLine()) != null) { // 阻塞
35                 bw.write(line);
36                 bw.newLine();
37                 bw.flush();
38             }
39 
40             // 给出反馈
41             BufferedWriter bwServer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
42             bwServer.write("文件上传成功");
43             bwServer.newLine();
44             bwServer.flush();
45 
46             // 释放资源
47             bw.close();
48             s.close();
49         } catch (IOException e) {
50             e.printStackTrace();
51         }
52     }
53 
54 }