JAVA实现简单的 web容器,HTTP协议

xiaoxiao2021-03-01  18

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; /** * <p>Title: WebServer</p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2006</p> * @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; /** * <p> * Title: ConnectionThread * </p> * <p> * Description: * </p> * <p> * Copyright: Copyright (c) 2006 * </p> * * @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“GET” */ 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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