Java使用TCP实现数据传输实例详解

Java使用TCP实现数据传输实例详解

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：

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：

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：

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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