一个简单的Web服务器

/*
 * 文件名：WebServer.java
 * 环境： GNU/Linux Ubuntu 7.04 + Eclipse 3.2
 * 功能：一个简单的Web服务器
 * 作者：88250
 * 日期：2007.4.22
 * E-mail & MDN: [email protected]
 * QQ：845765
  */

import  java.io. * ;
import  java.net. * ;
import  java.util. * ;

public   class  WebServer
{
     public   static   void  main(String argv[])  throws  Exception
    {
    String requestMessageLine;
    String fileName;
    ServerSocket listenSocket  =   new  ServerSocket( 6789 );
    Socket connectionSocket  =  listenSocket.accept();
    BufferedReader inFromClient  =   new  BufferedReader( new  InputStreamReader(
        connectionSocket.getInputStream()));
    DataOutputStream outToClient  =   new  DataOutputStream(connectionSocket
        .getOutputStream());
    requestMessageLine  =  inFromClient.readLine();
    System.out.println(requestMessageLine);
    StringTokenizer tokenizedLine  =   new  StringTokenizer(requestMessageLine);
     if  (tokenizedLine.nextToken().equals( " GET " ))
    {
        fileName  =  tokenizedLine.nextToken();
         if  (fileName.startsWith( " / " )  ==   true )
        fileName  =  fileName.substring( 1 );
        File file  =   new  File(fileName);
         int  numOfBytes  =  ( int ) file.length();
        FileInputStream inFile  =   new  FileInputStream(fileName);
         byte [] fileInBytes  =   new   byte [numOfBytes];
        inFile.read(fileInBytes);
        outToClient.writeBytes( " HTTP/1.0 200 Document Follow " );
         if  (fileName.endsWith( " .jpg " ))
        outToClient.writeBytes( " Content-Type:image/jpeg " );
         if  (fileName.endsWith( " .gif " ))
        outToClient.writeBytes( " Content-Type:image/gif " );
         if  (fileName.endsWith( " .txt " ))
        outToClient.writeBytes( " Content-Type:txt " );
        outToClient.writeBytes( " Content-Length: "   +  numOfBytes  +   " " );
        outToClient.writeBytes( " " );
        outToClient.write(fileInBytes,  0 , numOfBytes);
        connectionSocket.close();
    }
     else
        System.out.println( " Bad Request Message " );
    }
}

 
测试结果如下：