实现简单的 web容器，HTTP协议代码,Java代码库,德仔网

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【Java】实现简单的 web容器，HTTP协议
作者:dezai / 发布于2014/2/8/ 361
WebServer.java

/*
* $RCSfile: WebServer.java,v $
* $Revision: 1.1 $
* $Date: 2009-2-20 $
*
* Copyright (C) 2005 Bettem, Inc. All rights reserved.
*
* This software is the proprietary information of Bettem, Inc.
* Use is subject to license terms.
*/

package com.lihan;

/**
* Title: WebServer
* Description: 
* Copyright: Copyright (c) 2006
* @author 李晗
* @version 1.0
*/

import java.net.*;

public class WebServer {
 public static void main(String args[]) {
  
  int i = 1, PORT = 807;
  
  ServerSocket server = null;
  
  Socket client = null;
  
  try {
   
   server = new ServerSocket(PORT);
   
   System.out.println("Web Server is listening on port "+ server.getLocalPort());
   
   for (;;)
   {
    client = server.accept(); // 接受客户机的连接请求
    
    new ConnectionThread(client, i).start();
    
    i++;
   }
  } catch (Exception e) {
   
   e.printStackTrace();
   
  }
 }
}





ConnectionThread.java

/*
* $RCSfile: ConnectionThread.java,v $
* $Revision: 1.1 $
* $Date: 2009-2-20 $
*
* Copyright (C) 2005 Bettem, Inc. All rights reserved.
*
* This software is the proprietary information of Bettem, Inc.
* Use is subject to license terms.
*/

package com.lihan;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;

/**
* 
* Title: ConnectionThread
* 
* 
* Description:
* 
* 
* Copyright: Copyright (c) 2006
* 
*
* @author 李晗
* @version 1.0
*/

class ConnectionThread extends Thread {
 
 Socket client; // 连接Web浏览器的socket字
 int counter; // 计数器

 public ConnectionThread(Socket cl, int c) {
  client = cl;
  counter = c;
 }

 public void run() // 线程体
 {
  try {
   
   PrintStream outstream = new PrintStream(client.getOutputStream());
   
   System.out.println("aaa"+client.getOutputStream());
   
   DataInputStream instream = new DataInputStream(client.getInputStream());
   
   String inline = instream.readLine(); // 读取Web浏览器提交的请求信息,主要是这里，获取协议
   
   System.out.println("Received:" + inline);
   
   if (getrequest(inline)) { // 如果是GET请求
    
    String filename = getFilename(inline);
    
    File file = new File(filename);
    
    System.out.println("File Path："+file.getAbsolutePath());
    
    if (file.exists())
    { // 若文件存在，则将文件送给Web浏览器
     
     outstream.println("HTTP/1.0 200 OK");
     outstream.println("MIME_version:1.0");
     outstream.println("Content_Type:text/html");
     
     int len = (int) file.length();
     
     outstream.println("Content_Length:" + len);
     outstream.println("");
     
     sendFile(outstream, file); // 发送文件
     outstream.flush();
    }
    else
    { // 文件不存在时
     String notfound = "<html><head><title>Not Found</title></head><body><h1>Error 404-file not found</h1></body></html>";
     
     outstream.println("HTTP/1.0 404 no found");
     
     outstream.println("Content_Type:text/html");
     
     outstream.println("Content_Length:" + notfound.length() + 2);
     
     outstream.println("");
     
     outstream.println(notfound);
     
     outstream.flush();
    }
    
   }
   
   long m1 = 1;
   
   while (m1 < 11100000)
   {
    m1++;
   } // 延时
   
   client.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 /* 获取请求类型是否为&ldquo;GET&rdquo; */
 boolean getrequest(String s) {
  if (s.length() > 0)
  {
   if (s.substring(0, 3).equalsIgnoreCase("GET"))
   {
    return true;
   }
  }
  return false;
 }

 /* 获取要访问的文件名 */
 String getFilename(String s)
 {
  String f = s.substring(s.indexOf(' ') + 1);
  f = f.substring(0, f.indexOf(' '));
  try
  {
   if (f.charAt(0) == '/')
   {
    f = f.substring(1);
   }
  }
  catch (StringIndexOutOfBoundsException e) {
   System.out.println("Exception:" + e);
  }
  if (f.equals(""))
  {
   f = "index.html";//设置默认首页
  }
  return f;
 }

 /* 把指定文件发送给Web浏览器 */
 void sendFile(PrintStream outs, File file) {
  try {
   DataInputStream in = new DataInputStream(new FileInputStream(file));
   int len = (int) file.length();
   byte buf[] = new byte[len];
   in.readFully(buf);
   outs.write(buf, 0, len);
   outs.flush();
   in.close();
  }
  catch (Exception e)
  {
   e.printStackTrace();
   System.exit(1);
  }
 }
}
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