TCP所提供服务的主要特点:
1.面向连接的传输;
2.端到端的通信;
3.高可靠性,确保传输数据的正确性,不出现丢失或乱序;
4.全双工方式传输;
5.采用字节流方式,即以字节为单位传输字节序列;
6.紧急数据传送功能。
TCP传输需要建立客户端和服务器端,即Socket和Server Socket , 建立连接后,通过Socket中的IO流进行数据的传输 。传输结束后关闭Socket。
客户端和服务器端是两个独立的应用程序。
以下是实现基本的TCP数据传输的Demo code:
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package javase.day18; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.ServerSocket; import java.net.Socket; public class TransTextDemo { public static void main(String[] args) { } } class TcpClient2{ public static void main(String[] args) throws Exception{ System.out.println( "client start..." ); Socket s = new Socket( "192.168.1.2" , 10005 ); BufferedReader br = new BufferedReader( new InputStreamReader(System.in)); BufferedWriter bw = new BufferedWriter( new OutputStreamWriter(s.getOutputStream())); String sendDataStr= null ; while ((sendDataStr=br.readLine())!= null ){ if (sendDataStr.equals( "bye" )){ break ; } bw.write(sendDataStr); bw.newLine(); bw.flush(); } bw.close(); } } class TcpServer2{ public static void main(String[] args) throws Exception{ System.out.println( "server start..." ); ServerSocket ss = new ServerSocket( 10005 ); Socket s = ss.accept(); BufferedReader br = new BufferedReader( new InputStreamReader(s.getInputStream())); BufferedWriter bw = new BufferedWriter( new OutputStreamWriter(s.getOutputStream())); String receiveDataStr= null ; while ((receiveDataStr=br.readLine())!= null ){ if (receiveDataStr.equals( "bye" )){ break ; } System.out.println( "receive data:" +receiveDataStr); } } } |
使用TCP实现文本文件上传的Demo code:
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package javase.day18; import java.io.BufferedReader; import java.io.FileReader; import java.io.FileWriter; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; public class UploadText { public static void main(String[] args) { // TODO Auto-generated method stub } } class TextServer{ public static void main(String[] args) throws Exception{ System.out.println( "Server start..." ); ServerSocket ss = new ServerSocket( 10008 ); Socket s = ss.accept(); BufferedReader br = new BufferedReader( new InputStreamReader(s.getInputStream())); PrintWriter out = new PrintWriter( new FileWriter( "C:\\java_test\\server.txt" ), true ); String line= null ; while ((line=br.readLine())!= null ){ System.out.println(line); out.println(line); } PrintWriter pw = new PrintWriter( new OutputStreamWriter(s.getOutputStream()), true ); pw.println( "upload successful" ); pw.close(); s.close(); ss.close(); } } class TextClient{ public static void main(String[] args) throws Exception{ System.out.println( "Client start..." ); Socket clientSocket = new Socket( "192.168.1.2" , 10008 ); BufferedReader br = new BufferedReader( new FileReader( "C:\\java_test\\SystemDemo.java" )); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true ); String line= null ; while ((line=br.readLine())!= null ){ System.out.println(line); out.println(line); } clientSocket.shutdownOutput(); BufferedReader br2 = new BufferedReader( new InputStreamReader(clientSocket.getInputStream())); String confirmMsgStr=br2.readLine(); System.out.println(confirmMsgStr); br2.close(); clientSocket.close(); } } |
实现图片上传的Demo code:
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package javase.day18; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.net.ServerSocket; import java.net.Socket; public class UploadImage { public static void main(String[] args) { } } class ImageClient{ public static void main(String[] args) throws Exception{ Socket imageClientSocket = new Socket( "192.168.1.2" , 10010 ); BufferedInputStream bis = new BufferedInputStream( new FileInputStream( "C:\\java_test\\client\\生活用品01.jpg" )); BufferedOutputStream bos = new BufferedOutputStream(imageClientSocket.getOutputStream()); byte [] buf = new byte [ 1024 * 100 ]; int len = 0 ; while ((len=bis.read(buf))!=- 1 ){ bos.write(buf, 0 ,len); } imageClientSocket.shutdownOutput(); BufferedInputStream bis2 = new BufferedInputStream(imageClientSocket.getInputStream()); byte [] buf2 = new byte [ 1024 ]; int len2 = 0 ; while ((len2=bis2.read(buf2))!=- 1 ){ System.out.println( new String(buf2, 0 ,len2)); } bis.close(); imageClientSocket.close(); } } class ImageServer{ public static void main(String[] args) throws Exception{ ServerSocket ss = new ServerSocket( 10010 ); Socket s = ss.accept(); BufferedInputStream bis = new BufferedInputStream(s.getInputStream()); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream( "C:\\java_test\\server\\生活用品01.jpg" )); byte [] buf = new byte [ 1024 * 100 ]; int len = 0 ; while ((len=bis.read(buf))!=- 1 ){ bos.write(buf, 0 , len); } BufferedOutputStream bos2 = new BufferedOutputStream(s.getOutputStream()); bos2.write( "upload successful" .getBytes()); bos2.close(); s.close(); ss.close(); } } |
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原文链接:http://blog.csdn.net/alex_zhuang/article/details/6945650