java socket实现文件的上传和下载试例

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import java.io.BufferedInputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;public class ServerScoket {//服务器端int port= 8822;//设置的端口号public void UpFile(){//接受客户端上传的文件，并保存 try {  ServerSocket server= new ServerSocket(port);           while(true){              Socket socket = server.accept();                 DataInputStream is = new  DataInputStream(socket.getInputStream());                  OutputStream os = socket.getOutputStream();                                 //1、得到文件名                      String filename="E:\\";               filename += is.readUTF();                             System.out.println("新生成的文件名为:"+filename);                 FileOutputStream fos = new FileOutputStream(filename);                 byte[] b = new byte[1024];                int length = 0;                 while((length=is.read(b))!=-1){                     //2、把socket输入流写到文件输出流中去                     fos.write(b, 0, length);                 }                 fos.flush();                 fos.close();                              is.close();                 socket.close();             }                      } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }    }public void DownFile(String filePath){//接受客户端的下载请求，将本地文件传输给客户端       try {           while (true) {ServerSocket server= new ServerSocket(port);            // 选择进行传输的文件               File fi = new File(filePath);               System.out.println("文件长度:" + (int) fi.length());               // public Socket accept() throws               // 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。               Socket socket = server.accept();               System.out.println("建立socket链接");              /* DataInputStream dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));               dis.readByte();               */               DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));               DataOutputStream ps = new DataOutputStream(socket.getOutputStream());               //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。               ps.writeUTF(fi.getName());               System.out.println(fi.getName());               ps.flush();              int bufferSize = 8192;               byte[] buf = new byte[bufferSize];               while (true) {                   int read = 0;                   if (fis != null) {                       read = fis.read(buf);                   }                   if (read == -1) {                       break;                   }                   ps.write(buf, 0, read);               }               ps.flush();               // 注意关闭socket链接哦，不然客户端会等待server的数据过来，               // 直到socket超时，导致数据不完整。                               fis.close();               socket.close();                               System.out.println("文件传输完成");           }       } catch (Exception e) {           e.printStackTrace();       } }public static void main(String arg[]) {    //String filepath="D:\\test.txt";       new ServerScoket().UpFile();   }}********************************************************************************************************************************************************import java.io.BufferedInputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.net.Socket;public class ClientScoket {//客户端private String ip = "localhost";// 设置成服务器IP    private int port = 8822;//设置端口号    public void UpFile(String filePath){    //上传文件，将本地文件传输到服务器端        try {        Socket socket = new Socket(ip,port);             while (true) {             // 选择进行传输的文件                File fi = new File(filePath);                System.out.println("文件长度:" + (int) fi.length());               /* DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));                dis.readByte();                */                DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));                DataOutputStream ps = new DataOutputStream(socket.getOutputStream());                //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。                ps.writeUTF(fi.getName());                ps.flush();                int bufferSize = 8192;                byte[] buf = new byte[bufferSize];                while (true) {                    int read = 0;                    if (fis != null) {                        read = fis.read(buf);                    }                    if (read == -1) {                        break;                    }                    ps.write(buf, 0, read);                }                ps.flush();                // 注意关闭socket链接哦，不然客户端会等待server的数据过来，                // 直到socket超时，导致数据不完整。                                fis.close();                socket.close();                                System.out.println("文件传输完成");            }        } catch (Exception e) {            e.printStackTrace();        }  }public void DownFile(){//从服务器端下载文件try {     Socket socket = new Socket(ip,port);           while(true){                 DataInputStream is = new  DataInputStream(socket.getInputStream());                  OutputStream os = socket.getOutputStream();                                 //1、得到文件名                      String filename="E:\\";               filename += is.readUTF();                             System.out.println("新生成的文件名为:"+filename);                 FileOutputStream fos = new FileOutputStream(filename);                 byte[] b = new byte[1024];                int length = 0;                 while((length=is.read(b))!=-1){                     //2、把socket输入流写到文件输出流中去                     fos.write(b, 0, length);                 }                 fos.flush();                 fos.close();                              is.close();                 socket.close();             }         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }   }  public static void main(String arg[]) {String filepath="D:\\test.txt";       new ClientScoket().UpFile(filepath);;   }}
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