java socket

引用：http://wiseideal.iteye.com/blog/1167886

Java代码  收藏代码
  1. package sterning;  
  2.   
  3. import java.io.BufferedInputStream;  
  4. import java.io.DataInputStream;  
  5. import java.io.DataOutputStream;  
  6. import java.io.File;  
  7. import java.io.FileInputStream;  
  8. import java.net.ServerSocket;  
  9. import java.net.Socket;  
  10.   
  11. public class ServerTest {  
  12.     int port = 8821;  
  13.   
  14.     void start() {  
  15.         Socket s = null;  
  16.         try {  
  17.             ServerSocket ss = new ServerSocket(port);  
  18.             while (true) {  
  19.                 // 选择进行传输的文件  
  20.                 String filePath = "D:\\lib.rar";  
  21.                 File fi = new File(filePath);  
  22.   
  23.                 System.out.println("文件长度:" + (int) fi.length());  
  24.   
  25.                 // public Socket accept() throws  
  26.                 // 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。  
  27.   
  28.                 s = ss.accept();  
  29.                 System.out.println("建立socket链接");  
  30.                 DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));  
  31.                 dis.readByte();  
  32.   
  33.                 DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));  
  34.                 DataOutputStream ps = new DataOutputStream(s.getOutputStream());  
  35.                 //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。  
  36.                 ps.writeUTF(fi.getName());  
  37.                 ps.flush();  
  38.                 ps.writeLong((long) fi.length());  
  39.                 ps.flush();  
  40.   
  41.                 int bufferSize = 8192;  
  42.                 byte[] buf = new byte[bufferSize];  
  43.   
  44.                 while (true) {  
  45.                     int read = 0;  
  46.                     if (fis != null) {  
  47.                         read = fis.read(buf);  
  48.                     }  
  49.   
  50.                     if (read == -1) {  
  51.                         break;  
  52.                     }  
  53.                     ps.write(buf, 0, read);  
  54.                 }  
  55.                 ps.flush();  
  56.                 // 注意关闭socket链接哦，不然客户端会等待server的数据过来，  
  57.                 // 直到socket超时，导致数据不完整。                  
  58.                 fis.close();  
  59.                 s.close();                  
  60.                 System.out.println("文件传输完成");  
  61.             }  
  62.   
  63.         } catch (Exception e) {  
  64.             e.printStackTrace();  
  65.         }  
  66.     }  
  67.   
  68.     public static void main(String arg[]) {  
  69.         new ServerTest().start();  
  70.     }  
  71. }  



2.socket的Util辅助类 

Java代码  收藏代码
  1. package sterning;  
  2.   
  3. import java.net.*;  
  4. import java.io.*;  
  5.   
  6. public class ClientSocket {  
  7.     private String ip;  
  8.   
  9.     private int port;  
  10.   
  11.     private Socket socket = null;  
  12.   
  13.     DataOutputStream out = null;  
  14.   
  15.     DataInputStream getMessageStream = null;  
  16.   
  17.     public ClientSocket(String ip, int port) {  
  18.         this.ip = ip;  
  19.         this.port = port;  
  20.     }  
  21.   
  22.     /** *//** 
  23.      * 创建socket连接 
  24.      *  
  25.      * @throws Exception 
  26.      *             exception 
  27.      */  
  28.     public void CreateConnection() throws Exception {  
  29.         try {  
  30.             socket = new Socket(ip, port);  
  31.         } catch (Exception e) {  
  32.             e.printStackTrace();  
  33.             if (socket != null)  
  34.                 socket.close();  
  35.             throw e;  
  36.         } finally {  
  37.         }  
  38.     }  
  39.   
  40.     public void sendMessage(String sendMessage) throws Exception {  
  41.         try {  
  42.             out = new DataOutputStream(socket.getOutputStream());  
  43.             if (sendMessage.equals("Windows")) {  
  44.                 out.writeByte(0x1);  
  45.                 out.flush();  
  46.                 return;  
  47.             }  
  48.             if (sendMessage.equals("Unix")) {  
  49.                 out.writeByte(0x2);  
  50.                 out.flush();  
  51.                 return;  
  52.             }  
  53.             if (sendMessage.equals("Linux")) {  
  54.                 out.writeByte(0x3);  
  55.                 out.flush();  
  56.             } else {  
  57.                 out.writeUTF(sendMessage);  
  58.                 out.flush();  
  59.             }  
  60.         } catch (Exception e) {  
  61.             e.printStackTrace();  
  62.             if (out != null)  
  63.                 out.close();  
  64.             throw e;  
  65.         } finally {  
  66.         }  
  67.     }  
  68.   
  69.     public DataInputStream getMessageStream() throws Exception {  
  70.         try {  
  71.             getMessageStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));  
  72.             return getMessageStream;  
  73.         } catch (Exception e) {  
  74.             e.printStackTrace();  
  75.             if (getMessageStream != null)  
  76.                 getMessageStream.close();  
  77.             throw e;  
  78.         } finally {  
  79.         }  
  80.     }  
  81.   
  82.     public void shutDownConnection() {  
  83.         try {  
  84.             if (out != null)  
  85.                 out.close();  
  86.             if (getMessageStream != null)  
  87.                 getMessageStream.close();  
  88.             if (socket != null)  
  89.                 socket.close();  
  90.         } catch (Exception e) {  
  91.   
  92.         }  
  93.     }  
  94. }  



3.客户端 

Java代码  收藏代码
  1. package sterning;  
  2.   
  3. import java.io.BufferedOutputStream;  
  4. import java.io.DataInputStream;  
  5. import java.io.DataOutputStream;  
  6. import java.io.FileOutputStream;  
  7.   
  8. public class ClientTest {  
  9.     private ClientSocket cs = null;  
  10.   
  11.     private String ip = "localhost";// 设置成服务器IP  
  12.   
  13.     private int port = 8821;  
  14.   
  15.     private String sendMessage = "Windwos";  
  16.   
  17.     public ClientTest() {  
  18.         try {  
  19.             if (createConnection()) {  
  20.                 sendMessage();  
  21.                 getMessage();  
  22.             }  
  23.   
  24.         } catch (Exception ex) {  
  25.             ex.printStackTrace();  
  26.         }  
  27.     }  
  28.   
  29.     private boolean createConnection() {  
  30.         cs = new ClientSocket(ip, port);  
  31.         try {  
  32.             cs.CreateConnection();  
  33.             System.out.print("连接服务器成功!" + "\n");  
  34.             return true;  
  35.         } catch (Exception e) {  
  36.             System.out.print("连接服务器失败!" + "\n");  
  37.             return false;  
  38.         }  
  39.   
  40.     }  
  41.   
  42.     private void sendMessage() {  
  43.         if (cs == null)  
  44.             return;  
  45.         try {  
  46.             cs.sendMessage(sendMessage);  
  47.         } catch (Exception e) {  
  48.             System.out.print("发送消息失败!" + "\n");  
  49.         }  
  50.     }  
  51.   
  52.     private void getMessage() {  
  53.         if (cs == null)  
  54.             return;  
  55.         DataInputStream inputStream = null;  
  56.         try {  
  57.             inputStream = cs.getMessageStream();  
  58.         } catch (Exception e) {  
  59.             System.out.print("接收消息缓存错误\n");  
  60.             return;  
  61.         }  
  62.   
  63.         try {  
  64.             //本地保存路径，文件名会自动从服务器端继承而来。  
  65.             String savePath = "E:\\";  
  66.             int bufferSize = 8192;  
  67.             byte[] buf = new byte[bufferSize];  
  68.             int passedlen = 0;  
  69.             long len=0;  
  70.               
  71.             savePath += inputStream.readUTF();  
  72.             DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(savePath))));  
  73.             len = inputStream.readLong();  
  74.               
  75.             System.out.println("文件的长度为:" + len + "\n");  
  76.             System.out.println("开始接收文件!" + "\n");  
  77.                       
  78.             while (true) {  
  79.                 int read = 0;  
  80.                 if (inputStream != null) {  
  81.                     read = inputStream.read(buf);  
  82.                 }  
  83.                 passedlen += read;  
  84.                 if (read == -1) {  
  85.                     break;  
  86.                 }  
  87.                 //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  
  88.                 System.out.println("文件接收了" +  (passedlen * 100/ len) + "%\n");  
  89.                 fileOut.write(buf, 0, read);  
  90.             }  
  91.             System.out.println("接收完成，文件存为" + savePath + "\n");  
  92.   
  93.             fileOut.close();  
  94.         } catch (Exception e) {  
  95.             System.out.println("接收消息错误" + "\n");  
  96.             return;  
  97.         }  
  98.     }  
  99.   
  100.     public static void main(String arg[]) {  
  101.         new ClientTest();  
  102.     }  
  103. }  
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原文地址：https://www.cnblogs.com/sode/p/2384494.html