阻塞式简易http服务器

• 说明

        使用java.net包的ServerSocket也是阻塞的，所以下面的实例把ServerSocketChannel换成ServerSocket效果一样。

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• 后台代码

 package study.socket.tcp.block.httpserver;

 import java.io.FileInputStream;
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.channels.FileChannel;
 import java.nio.channels.ServerSocketChannel;
 import java.nio.channels.SocketChannel;
 import java.nio.charset.Charset;
 import java.nio.charset.CharsetDecoder;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;

 /**
  * 阻塞式简易http服务器
  * @author yj
  *
  */
 public class SimpleHttpServer {

     private int port = 8080;
     private ServerSocketChannel serverSocketChannel = null;
     private ExecutorService executorService;
     private static final int POOL_MULTIPE = 4;

     public SimpleHttpServer() throws Exception {
         executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()*POOL_MULTIPE);
         serverSocketChannel = ServerSocketChannel.open();
         serverSocketChannel.socket().setReuseAddress(true);
         serverSocketChannel.socket().bind(new InetSocketAddress(port));
         System.out.println("服务器启动");
     }

     public void service() {
         while(true) {
             System.out.println("服务器接收到客户端请求");
             SocketChannel socketChannel = null;
             try {
                 socketChannel = serverSocketChannel.accept();
             } catch (IOException e) {
                 e.printStackTrace();
             }
             executorService.execute(new Handler(socketChannel));
             System.out.println("服务端处理完客户端请求");
         }
     }

     private class Handler implements Runnable {

         private SocketChannel socketChannel;

         public Handler(SocketChannel socketChannel) {
             this.socketChannel = socketChannel;
         }

         @Override
         public void run() {
             handler();
         }

         private void handler() {
             FileInputStream fis = null;
             try{
                 new Thread().sleep(60000);
                 Socket socket = socketChannel.socket();
                 System.out.println("接受到客户连接来自：" + socket.getInetAddress() + ":" + socket.getPort());
                 ByteBuffer bb = ByteBuffer.allocate(1024);
                 socketChannel.read(bb);
                 bb.flip();
                 String request = decode(bb);
                 System.out.println("客户端请求消息：" + request);
                 //生成http响应消息
                 StringBuffer sb = new StringBuffer("HTTP/1.1 200 OK\r\n");
                 sb.append("Content-Type:text/html\r\n\r\n");
                 //发送http响应第一行和响应头
                 socketChannel.write(encode(sb.toString()));

                 //获取http请求的第一行
                 String firstLineOfRequst = request.substring(0, request.indexOf("\r\n"));
                 String filePath = SimpleHttpServer.class.getResource("/").getPath();
                 System.out.println("路径：" + filePath);
                 System.out.println("测试");
                 if(firstLineOfRequst.indexOf("login.html") != -1) {
                     fis = new FileInputStream(filePath + "study/socket/block/httpserver/login.html");
                 }else {
                     fis = new FileInputStream(filePath + "study/socket/block/httpserver/hello.html");
                 }
                 FileChannel fc = fis.getChannel();
                 fc.transferTo(0, fc.size(), socketChannel);
             }catch(Exception e){
                 e.printStackTrace();
             }finally {
                 try {
                     if(fis != null) {
                         fis.close();
                     }
                     if(socketChannel != null) {
                         socketChannel.close();
                     }
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }

         private String decode(ByteBuffer bb) throws Exception{
             Charset charset  =  Charset.forName("utf-8");
             CharsetDecoder decoder  =  charset.newDecoder();
             CharBuffer charBuffer  =  decoder.decode(bb);
             System.out.println( " charBuffer= "   +  charBuffer);
             System.out.println(charBuffer.toString());
             System.out.println("编码");
             return  charBuffer.toString();
         }

         private ByteBuffer encode(String str) {
             System.out.println("解码");
             return ByteBuffer.wrap(str.getBytes());
         }

     }

     public static void main(String[] args) {
         try {
             new SimpleHttpServer().service();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }

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• hello.html文件

        html文件放在类的同级目录下，如果放其他目录下，上面后台代码需要改变取html文件路径。

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
     <h1>hello</h1>
 </body>
 </html>

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• login.html文件

        html文件放在类的同级目录下，如果放其他目录下，上面后台代码需要改变取html文件路径。

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
     <h1>login</h1>
 </body>
 </html>

• 测试

浏览器中输入：http://ip:port/或http://ip:port/hello.html访问hello.html,输入：http://ip:port/login.html访问login.html