socket在网络中传输传输大文件

旧城等待， 2022-10-02 02:59 199阅读 0赞

1.服务器端

![None.gif][] package  sterning;  
![None.gif][]  
![None.gif][] import  java.io.BufferedInputStream;  
![None.gif][] import  java.io.DataInputStream;  
![None.gif][] import  java.io.DataOutputStream;  
![None.gif][] import  java.io.File;  
![None.gif][] import  java.io.FileInputStream;  
![None.gif][] import  java.net.ServerSocket;  
![None.gif][] import  java.net.Socket;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  ServerTest  \{  
![InBlock.gif][]    int port = 8821;  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    void start() \{  
![InBlock.gif][]        Socket s = null;  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            ServerSocket ss = new ServerSocket(port);  
![ExpandedSubBlockStart.gif][]            while (true) \{  
![InBlock.gif][]                // 选择进行传输的文件  
![InBlock.gif][]                String filePath = "D:\\\\lib.rar";  
![InBlock.gif][]                File fi = new File(filePath);  
![InBlock.gif][]  
![InBlock.gif][]                System.out.println("文件长度:" \+ (int) fi.length());  
![InBlock.gif][]  
![InBlock.gif][]                // public Socket accept() throws  
![InBlock.gif][]                // IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。  
![InBlock.gif][]  
![InBlock.gif][]                s = ss.accept();  
![InBlock.gif][]                System.out.println("建立socket链接");  
![InBlock.gif][]                DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));  
![InBlock.gif][]                dis.readByte();  
![InBlock.gif][]  
![InBlock.gif][]                DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));  
![InBlock.gif][]                DataOutputStream ps = new DataOutputStream(s.getOutputStream());  
![InBlock.gif][]                //将文件名及长度传给客户端。这里要真正适用所有平台，例如中文名的处理，还需要加工，具体可以参见Think In Java 4th里有现成的代码。  
![InBlock.gif][]                ps.writeUTF(fi.getName());  
![InBlock.gif][]                ps.flush();  
![InBlock.gif][]                ps.writeLong((long) fi.length());  
![InBlock.gif][]                ps.flush();  
![InBlock.gif][]  
![InBlock.gif][]                int bufferSize = 8192;  
![InBlock.gif][]                byte\[\] buf = new byte\[bufferSize\];  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]                while (true) \{  
![InBlock.gif][]                    int read = 0;  
![ExpandedSubBlockStart.gif][]                    if (fis != null) \{  
![InBlock.gif][]                        read = fis.read(buf);  
![ExpandedSubBlockEnd.gif][]                    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]                    if (read == \-1) \{  
![InBlock.gif][]                        break;  
![ExpandedSubBlockEnd.gif][]                    \}  
![InBlock.gif][]                    ps.write(buf, 0, read);  
![ExpandedSubBlockEnd.gif][]                \}  
![InBlock.gif][]                ps.flush();  
![InBlock.gif][]                // 注意关闭socket链接哦，不然客户端会等待server的数据过来，  
![InBlock.gif][]                // 直到socket超时，导致数据不完整。                  
![InBlock.gif][]                fis.close();  
![InBlock.gif][]                s.close();                  
![InBlock.gif][]                System.out.println("文件传输完成");  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            e.printStackTrace();  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public static void main(String arg\[\]) \{  
![InBlock.gif][]        new ServerTest().start();  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

2.socket的Util辅助类

![None.gif][] package  sterning;  
![None.gif][]  
![None.gif][] import  java.net. \* ;  
![None.gif][] import  java.io. \* ;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  ClientSocket  \{  
![InBlock.gif][]    private String ip;  
![InBlock.gif][]  
![InBlock.gif][]    private int port;  
![InBlock.gif][]  
![InBlock.gif][]    private Socket socket = null;  
![InBlock.gif][]  
![InBlock.gif][]    DataOutputStream out = null;  
![InBlock.gif][]  
![InBlock.gif][]    DataInputStream getMessageStream = null;  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public ClientSocket(String ip, int port) \{  
![InBlock.gif][]        this.ip = ip;  
![InBlock.gif][]        this.port = port;  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    /\*\*  
![InBlock.gif][]     \* 创建socket连接  
![InBlock.gif][]     \*   
![InBlock.gif][]     \* @throws Exception  
![InBlock.gif][]     \*             exception  
![ExpandedSubBlockEnd.gif][]     \*/  
![ExpandedSubBlockStart.gif][]    public void CreateConnection() throws Exception \{  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            socket = new Socket(ip, port);  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            e.printStackTrace();  
![InBlock.gif][]            if (socket != null)  
![InBlock.gif][]                socket.close();  
![InBlock.gif][]            throw e;  
![ExpandedSubBlockStart.gif][]        \} finally \{  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public void sendMessage(String sendMessage) throws Exception \{  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            out = new DataOutputStream(socket.getOutputStream());  
![ExpandedSubBlockStart.gif][]            if (sendMessage.equals("Windows")) \{  
![InBlock.gif][]                out.writeByte(0x1);  
![InBlock.gif][]                out.flush();  
![InBlock.gif][]                return;  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockStart.gif][]            if (sendMessage.equals("Unix")) \{  
![InBlock.gif][]                out.writeByte(0x2);  
![InBlock.gif][]                out.flush();  
![InBlock.gif][]                return;  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockStart.gif][]            if (sendMessage.equals("Linux")) \{  
![InBlock.gif][]                out.writeByte(0x3);  
![InBlock.gif][]                out.flush();  
![ExpandedSubBlockStart.gif][]            \} else \{  
![InBlock.gif][]                out.writeUTF(sendMessage);  
![InBlock.gif][]                out.flush();  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            e.printStackTrace();  
![InBlock.gif][]            if (out != null)  
![InBlock.gif][]                out.close();  
![InBlock.gif][]            throw e;  
![ExpandedSubBlockStart.gif][]        \} finally \{  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public DataInputStream getMessageStream() throws Exception \{  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            getMessageStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));  
![InBlock.gif][]            return getMessageStream;  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            e.printStackTrace();  
![InBlock.gif][]            if (getMessageStream != null)  
![InBlock.gif][]                getMessageStream.close();  
![InBlock.gif][]            throw e;  
![ExpandedSubBlockStart.gif][]        \} finally \{  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public void shutDownConnection() \{  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            if (out != null)  
![InBlock.gif][]                out.close();  
![InBlock.gif][]            if (getMessageStream != null)  
![InBlock.gif][]                getMessageStream.close();  
![InBlock.gif][]            if (socket != null)  
![InBlock.gif][]                socket.close();  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

3.客户端

![None.gif][] package  sterning;  
![None.gif][]  
![None.gif][] import  java.io.BufferedOutputStream;  
![None.gif][] import  java.io.DataInputStream;  
![None.gif][] import  java.io.DataOutputStream;  
![None.gif][] import  java.io.FileOutputStream;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  ClientTest  \{  
![InBlock.gif][]    private ClientSocket cs = null;  
![InBlock.gif][]  
![InBlock.gif][]    private String ip = "localhost";// 设置成服务器IP  
![InBlock.gif][]  
![InBlock.gif][]    private int port = 8821;  
![InBlock.gif][]  
![InBlock.gif][]    private String sendMessage = "Windwos";  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public ClientTest() \{  
![ExpandedSubBlockStart.gif][]        try \{  
![ExpandedSubBlockStart.gif][]            if (createConnection()) \{  
![InBlock.gif][]                sendMessage();  
![InBlock.gif][]                getMessage();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \} catch (Exception ex) \{  
![InBlock.gif][]            ex.printStackTrace();  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    private boolean createConnection() \{  
![InBlock.gif][]        cs = new ClientSocket(ip, port);  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            cs.CreateConnection();  
![InBlock.gif][]            System.out.print("连接服务器成功!" \+ "\\n");  
![InBlock.gif][]            return true;  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            System.out.print("连接服务器失败!" \+ "\\n");  
![InBlock.gif][]            return false;  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    private void sendMessage() \{  
![InBlock.gif][]        if (cs == null)  
![InBlock.gif][]            return;  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            cs.sendMessage(sendMessage);  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            System.out.print("发送消息失败!" \+ "\\n");  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    private void getMessage() \{  
![InBlock.gif][]        if (cs == null)  
![InBlock.gif][]            return;  
![InBlock.gif][]        DataInputStream inputStream = null;  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            inputStream = cs.getMessageStream();  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            System.out.print("接收消息缓存错误\\n");  
![InBlock.gif][]            return;  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        try \{  
![InBlock.gif][]            //本地保存路径，文件名会自动从服务器端继承而来。  
![InBlock.gif][]            String savePath = "E:\\\\";  
![InBlock.gif][]            int bufferSize = 8192;  
![InBlock.gif][]            byte\[\] buf = new byte\[bufferSize\];  
![InBlock.gif][]            int passedlen = 0;  
![InBlock.gif][]            long len=0;  
![InBlock.gif][]              
![InBlock.gif][]            savePath \+= inputStream.readUTF();  
![InBlock.gif][]            DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(savePath))));  
![InBlock.gif][]            len = inputStream.readLong();  
![InBlock.gif][]              
![InBlock.gif][]            System.out.println("文件的长度为:" \+ len \+ "\\n");  
![InBlock.gif][]            System.out.println("开始接收文件!" \+ "\\n");  
![InBlock.gif][]                      
![ExpandedSubBlockStart.gif][]            while (true) \{  
![InBlock.gif][]                int read = 0;  
![ExpandedSubBlockStart.gif][]                if (inputStream != null) \{  
![InBlock.gif][]                    read = inputStream.read(buf);  
![ExpandedSubBlockEnd.gif][]                \}  
![InBlock.gif][]                passedlen \+= read;  
![ExpandedSubBlockStart.gif][]                if (read == \-1) \{  
![InBlock.gif][]                    break;  
![ExpandedSubBlockEnd.gif][]                \}  
![InBlock.gif][]                //下面进度条本为图形界面的prograssBar做的，这里如果是打文件，可能会重复打印出一些相同的百分比  
![InBlock.gif][]                System.out.println("文件接收了" \+  (passedlen \* 100/ len) \+ "%\\n");  
![InBlock.gif][]                fileOut.write(buf, 0, read);  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            System.out.println("接收完成，文件存为" \+ savePath \+ "\\n");  
![InBlock.gif][]  
![InBlock.gif][]            fileOut.close();  
![ExpandedSubBlockStart.gif][]        \} catch (Exception e) \{  
![InBlock.gif][]            System.out.println("接收消息错误" \+ "\\n");  
![InBlock.gif][]            return;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public static void main(String arg\[\]) \{  
![InBlock.gif][]        new ClientTest();  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}

这就实现了从服务器端向客户端发送文件的过程,当然,反过来,也一样.稍有不同.

原文来自：http://www.blogjava.net/sterning/archive/2007/10/13/152508.html

[None.gif]: /images/20220113/e67441c209ef4b4ebff044d6c16b90b2.png
[ExpandedBlockStart.gif]: /images/20220113/554b10dd9b1f4e2e9a2cd9e4b93f10e5.png
[InBlock.gif]: /images/20220113/b1045c2c77b041ee84d74d6ee9c4dadf.png
[ExpandedSubBlockStart.gif]: /images/20220113/c7c740df897c46a780c29bf5e5e14e04.png
[ExpandedSubBlockEnd.gif]: /images/20220113/8ae26a5464824228a52af49957cc942b.png
[ExpandedBlockEnd.gif]: /images/20220113/b5ff14b92ba54de99b382c8547d52773.png