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java webServer实现
浏览器和服务器使用的是http协议，http协议使用的是tcp
这里主要在服务器端监听端口号
实现功能
通过浏览器向服务器发送http请求:http://localhost:9999/index.html(这里监听的是9999端口)
服务器解析http请求，生成Html响应客户端请求
WebServer.java
1 package com.gxf.webServer; 2 3 import java.io.BufferedReader; 4 import java.io.IOException; 5 import java.io.InputStream; 6 import java.io.InputStreamReader; 7 import java.io.OutputStream; 8 import java.io.PrintStream; 9 import java.net.ServerSocket; 10 import java.net.Socket; 11 12 /** 13 * web服务器 14 * 监听9999端口号 15 * @author Administrator 16 * 17 */ 18 public class WebServer { 19 //服务器监听端口号 20 private final int PORT_LISTENING = 9999; 21 22 public static void main(String args[]){ 23 WebServer webServer = new WebServer(); 24 25 //启动服务器 26 webServer.startService(); 27 } 28 29 30 //启动web服务器 31 public void startService(){ 32 ServerSocket serverSocket = null; 33 try { 34 serverSocket = new ServerSocket(PORT_LISTENING); 35 } catch (IOException e) { 36 e.printStackTrace(); 37 } 38 while(serverSocket != null){ 39 try { 40 Socket clientSocket = serverSocket.accept(); 41 //new 一个线程处理客户端请求 42 new HandleRequest(clientSocket).start(); 43 } catch (IOException e) { 44 e.printStackTrace(); 45 } 46 } 47 } 48 } 49 50 /** 51 * 解析客户端的http请求 52 * 生成html响应客户端请求 53 * @author Administrator 54 * 55 */ 56 class HandleRequest extends Thread{ 57 //客户端socket 58 private Socket clientSocket; 59 private OutputStream os; 60 private InputStream is; 61 62 public HandleRequest(Socket clientSocket){ 63 this.clientSocket = clientSocket; 64 try { 65 os = this.clientSocket.getOutputStream(); 66 is = this.clientSocket.getInputStream(); 67 } catch (IOException e) { 68 e.printStackTrace(); 69 } 70 } 71 72 public void run(){ 73 //解析客户端http请求 74 BufferedReader bfr = new BufferedReader(new InputStreamReader(is)); 75 String requestLine = ""; 76 String resourceRequest = ""; 77 try { 78 requestLine = bfr.readLine(); 79 int spaceStartIndex = requestLine.indexOf(" "); 80 int spaceEndIndex = requestLine.indexOf("HTTP"); 81 resourceRequest = requestLine.substring(spaceStartIndex, spaceEndIndex); 82 } catch (IOException e) { 83 84 e.printStackTrace(); 85 } 86 87 //生成html输出到客户端浏览器，响应客户端请求 88 PrintStream ps = new PrintStream(os); 89 ps.println("<html>"); 90 ps.println("<meta content=‘text/html; charset=gb2312‘ http-equiv=‘Content-Type‘/>"); 91 ps.println("<head><title>Welcome To MyWebServer</title></head>"); 92 ps.println("<h1>request resource is:" + resourceRequest + "</h1>"); 93 ps.println("</html>"); 94 95 ps.flush(); 96 ps.close(); 97 98 try { 99 clientSocket.close(); 100 } catch (IOException e) { 101 e.printStackTrace(); 102 } 103 } 104 }
这里只是解析了请求的资源
来一请求，开一个线程处理，如果大量request，或者处理request时间长了，服务器会崩溃
Excutor版本
ExcutorWebServer.java
1 package com.gxf.webServer; 2 3 import java.io.BufferedReader; 4 import java.io.IOException; 5 import java.io.InputStreamReader; 6 import java.io.PrintStream; 7 import java.net.ServerSocket; 8 import java.net.Socket; 9 import java.util.concurrent.Executor; 10 import java.util.concurrent.Executors; 11 12 /** 13 * web服务器 14 * 使用Excutor框架 15 * @author Administrator 16 * 17 */ 18 public class ExcutorWebServer { 19 //监听端口号 20 private static final int PORTNUM_LISTENING = 9999; 21 //线程池大小 22 private static final int NUM_THREADS_POOL = 100; 23 24 private static Executor executor = Executors.newFixedThreadPool(NUM_THREADS_POOL); 25 26 public static void main(String args[]) throws IOException{ 27 ServerSocket serverSocket = new ServerSocket(PORTNUM_LISTENING); 28 while(true){ 29 final Socket clientSocket = serverSocket.accept(); 30 31 Runnable task = new Runnable(){ 32 public void run(){ 33 //处理客户端请求 34 try { 35 handlRequest(clientSocket); 36 } catch (IOException e) { 37 // TODO Auto-generated catch block 38 e.printStackTrace(); 39 } 40 } 41 }; 42 43 executor.execute(task); 44 } 45 } 46 47 /** 48 * 处理请求 49 * @param task 50 * @throws IOException 51 */ 52 public static void handlRequest(Socket clientSocket) throws IOException{ 53 System.out.println(clientSocket.getRemoteSocketAddress()); 54 //解析客户端http请求 55 BufferedReader bfr = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); 56 String requestLine = ""; 57 String resourceRequest = ""; 58 try { 59 requestLine = bfr.readLine(); 60 int spaceStartIndex = requestLine.indexOf(" "); 61 int spaceEndIndex = requestLine.indexOf("HTTP"); 62 resourceRequest = requestLine.substring(spaceStartIndex, spaceEndIndex); 63 } catch (IOException e) { 64 65 e.printStackTrace(); 66 } 67 68 //生成html输出到客户端浏览器，响应客户端请求 69 PrintStream ps = new PrintStream(clientSocket.getOutputStream()); 70 ps.println("<html>"); 71 ps.println("<meta content=‘text/html; charset=gb2312‘ http-equiv=‘Content-Type‘/>"); 72 ps.println("<head><title>Welcome To MyWebServer</title></head>"); 73 ps.println("<h1>request resource is:" + resourceRequest + "</h1>"); 74 ps.println("</html>"); 75 76 ps.flush(); 77 ps.close(); 78 79 try { 80 clientSocket.close(); 81 } catch (IOException e) { 82 e.printStackTrace(); 83 } 84 } 85 }
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原文地址：http://www.cnblogs.com/luckygxf/p/4581762.html
