【Java】网络编程TCP 实现文件上传

Bertha 。 2023-02-25 11:29 20阅读 0赞

上一篇博客，用网络编程TCP 实现聊天，这次实现文件上传。

**客户端：**

package com.kuang.lesson02;
    
    import java.io.*;
    import java.net.InetAddress;
    import java.net.Socket;
    
    //客户端
    public class TcpClientDemo2 { 
        public static void main(String[] args) throws Exception { 
            //1、创建一个Socket连接
            Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);
            //2、创建一个输出流
            OutputStream os = socket.getOutputStream();
            //3、读取文件
            FileInputStream fis = new FileInputStream(new File("sendFile.jpg"));
            //4、写出文件
            byte[] buffer = new byte[1024];
            int len;
            while ((len=fis.read(buffer))!=-1) { 
                os.write(buffer,0,len);
            }
    
            //通知服务器，我已经结束了
            socket.shutdownOutput();
    
            //确定服务器接收完毕，才能断开连接
            InputStream inputStream = socket.getInputStream();
            //String byte[]
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
    
            byte[] buffer2 = new byte[1024];
            int len2;
            while ((len2=inputStream.read(buffer2))!=-1) { 
                baos.write(buffer2,0,len2);
            }
    
            System.out.println(baos.toString());
    
    
            //5、关闭资源
            fis.close();
            os.close();
            socket.close();
        }
    }

**服务端：**

package com.kuang.lesson02;
    
    import java.io.*;
    import java.net.ServerSocket;
    import java.net.Socket;
    
    //服务端
    public class TcpServerDemo02 { 
        public static void main(String[] args) throws Exception { 
            //1、创建服务
            ServerSocket serverSocket = new ServerSocket(9000);
            //2、监听客户端的连接
            //阻塞式监听，会一直等待客户端连接
            Socket socket = serverSocket.accept();
            //3、获取输入流
            InputStream is = socket.getInputStream();
            //4、文件输出
            FileOutputStream fos = new FileOutputStream(new File("receive.jpg"));
            byte[] buffer = new byte[1024];
            int len;
            while ((len=is.read(buffer))!=-1) { 
                fos.write(buffer,0,len);
            }
    
            //通知客户端我接收完毕
            OutputStream os = socket.getOutputStream();
            os.write("我接收完毕了，你可以断开了".getBytes());
    
            //5、关闭资源
            fos.close();
            is.close();
            socket.close();
            serverSocket.close();
        }
    
    }

**运行结果：**

1、首先可以发现目录下只有要上传的文件sendFile.jsp  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70]

2、运行服务端，创建服务，可以发现一直在运行![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70 1]

3、运行客户端，文件上传，可以发现目录下多了个上传到服务端的文件receive.jpg，同时接收到了服务端发送来的消息。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70 2]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70 3]

4、打开两个文件，可以发现相同  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDY2ODg5OA_size_16_color_FFFFFF_t_70 5]

网络编程实现文件上传就简单介绍到这里了！

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