如何用 Java实现自己的Web服务器

 

如何用Java实现Web服务器

2011-03-19 21:22 17人阅读 评论(0) 收藏 举报

http://zhidao.baidu.com/question/10672912.html?fr=qrl&cid=870&index=4&fr2=query

 

http://java./advance/519981.html

 

 

package net;
import java.net.*;
import java.io.*;
import java.util.*;
public class ServerWeb03 {
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  ServerSocket ss;
  Socket  s;
  try {
   FileReader  fr = new FileReader("D://port.txt"); //端口号放在指定的文件中
   BufferedReader  br = new BufferedReader(fr);
   int port = Integer.parseInt(br.readLine());



   ss = new ServerSocket(port);
   System.out.println("ServerWeb Server is listening on port "
     + ss.getLocalPort());

   int i = 1;
   while (true){
    s = ss.accept();             //接受客户机的请求
//    System.out.println("启动线程数：" + i);
    Runnable r = new ServerWebHandler03(s , i);
    Thread  t = new Thread(r);
    t.start();
    i++;                                  //计数器
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }
}
class  ServerWebHandler03  implements Runnable{
 Socket s = null;                              //连接web浏览器的socket字
 int i;
 public ServerWebHandler03(Socket  s, int i){
  this.s = s;
  this.i = i;
 }
 public void run(){


  try {
   String destIP  =  s.getLocalAddress().toString();      //客户机IP地址

   int   destPort =  s.getPort();//客户机   端口号

   System.out.println("Connection " + i + "  connected to" + destIP +
     "  on port :  " + destPort );

  /* Scanner  in = new Scanner(s.getInputStream());
        in.hasNextLine();  //boolean类型
   String line = in.nextLine();*/


   InputStream ips = s.getInputStream();
   BufferedReader br = new BufferedReader(new InputStreamReader(ips));


   PrintWriter  out = new PrintWriter(s.getOutputStream(), true);

   String line = br.readLine();                //读取web浏览器提交的请求
   System.out.println("Received: " + line);

   if (getRequest(line)){       //如果是GET请求

    String fileName = getFileName(line);

    File  file = new File(fileName);
    if (file.exists()){                      //若文件存在  将文件送给web浏览器
     System.out.println(file.getName() + "    requested");
     out.println("HTTP/1.1   200 OK");
     out.println("MIME_version: 1.0");
     out.println("Content_Type: text/html");
     int len = (int)file.length();
     out.println("Content_Length:" + len);
     out.println("");
     sendFile(out, file);             //发送文件
    }else{                               //若文件不存在
     out.println("HTTP/1.1  404  no fond");
     out.println("Content_Type: text/html");
    }
   }
   long m1 = 1;
   while (m1<11100000){
    m1++  ;   //延时
   }
   s.close();

  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }



   }

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

 String getFileName(String s){                   //获取访问的文件名
  String f = s.substring(s.indexOf(' ')+1);
  f = f.substring(0, f.indexOf(' '));
  try{
   if (f.charAt(0)=='/'){
    f.substring(1);
   }
  }catch (StringIndexOutOfBoundsException  e){
   e.printStackTrace();
  }
  if (f.equals("")){
   f = "index.html";
  }
  return f;
 }

 void sendFile(PrintWriter out,  File file){        //把指定文件发送给浏览器
  try {
//   Scanner  in = new Scanner(new FileInputStream(file));
//   Scanner  in = new Scanner(new FileReader(file));

   InputStreamReader  ipsr = new InputStreamReader(new FileInputStream(file));

   BufferedReader  br = new BufferedReader(new FileReader(file));

   String  str ;
   while ((str=br.readLine())!=null){
    out.write(str + "/r" + "/n");
   }
   br.close();
   out.close();
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

 

 

 

 

 

 

 

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