山寨web服务器

来源：互联网发布：ubuntu 画图工具编辑：程序博客网时间：2024/05/16 14:58

这是及其简单的web服务器，只实现从请求到处理请求的过程。基本架构如下

这里写图片描述

主程序：使用socket监听端口，等待用户连接，一旦有用户连接，创建一个线程放入线程池。代码如下：

package com.web.tomdog;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Tomdog {    public static void main(String[] args) {        new Tomdog().start();    }    /**     * 启动服务器     */    public void start(){        try {            //启动服务            ServerSocket ss = new ServerSocket(Properties.PORT);            System.out.println("服务器启动....端口："+Properties.PORT);            while(true){                //等待连接                Socket socket = ss.accept();                //一旦有连接，使用并发量100的线程池处理请求                ExecutorService pool = Executors.newFixedThreadPool(100);                pool.submit(new RequestHandlerThread(socket));            }        } catch (IOException e) {            e.printStackTrace();        }    }}

处理请求的线程：使用IO流，读取用户想要访问的资源，然后输出给用户

package com.web.tomdog;import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.PrintStream;import java.net.Socket;public class RequestHandlerThread implements Runnable{    private HttpRequest request = null;    private HttpResponse response = null;    public RequestHandlerThread(Socket socket) {        request = new HttpRequest(socket);        response = new HttpResponse(socket);    }    @Override    public void run() {        String url = request.getRequestUrl();        File file = new File(Properties.WEB_ROOT+url);        PrintStream out = response.getWriter();        if (file.exists()) {            try {                //根据用户请求的路径，读取文件                byte[] bs = new byte[(int)file.length()];                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));                bis.read(bs);                //将文件输出给用户                //使用println输出状态，使用write输出内容                out.println(Properties.STATUS_200);                //必须换行，否则浏览器无法解析                out.println();                out.write(bs);                out.flush();                out.close();            } catch (IOException e) {                e.printStackTrace();            }        }else{//找不到资源，返回404            out.println(Properties.STATUS_404);            out.println();            try {                out.write("<h1>404 ERROR...</h1>".getBytes());                out.flush();                out.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

封装request和response

package com.web.tomdog;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.Socket;public class HttpRequest {    private InputStream in = null;    private String requestUrl;    public HttpRequest(Socket socket) {        try {            in = socket.getInputStream();            this.requestUrl = parseRequestUrl();        } catch (IOException e) {            e.printStackTrace();        }    }    public String getRequestUrl(){        return this.requestUrl;    }    /**     * 解析请求信息，得到访问路径     * @return     */    private String parseRequestUrl(){        BufferedReader reader = new BufferedReader(new InputStreamReader(in));        String url = "";        try {            String head = reader.readLine();            System.out.println(head);            if (head != null) {                url = head.split(" ")[1];            }        } catch (IOException e) {            e.printStackTrace();        }        if(url.equals("/")){            url = Properties.INDEX;        }        return url;    }}

package com.web.tomdog;import java.io.IOException;import java.io.PrintStream;import java.net.Socket;public class HttpResponse {    private PrintStream out = null;    public HttpResponse(Socket socket){        try {            out = new PrintStream(socket.getOutputStream());        } catch (IOException e) {            e.printStackTrace();        }    }    public PrintStream getWriter(){        return out;    }}

自定义Properties类来替代读取配置文件的过程

package com.web.tomdog;import java.io.File;/** * 服务器配置信息（实际上应该从配置文件读取） * @author 周 * */public class Properties {    /**     * 默认端口号     */    public static final int PORT = 8080;    /**     * web资源文件根目录，相当于tomcat的webapps，此处指定为D:\webapps\     */    public static final String WEB_ROOT = "D:"+File.separator+"webapps"+File.separator;    /**     * 默认页面，当访问/路径时，即访问index.html     */    public static final String INDEX = "/index.html";    /**     * 状态码200     */    public static final String STATUS_200 = "HTTP/1.1 200 OK";    /**     * 状态码404     */    public static final String STATUS_404 = "HTTP/1.1 404 NOT FOUND";}

在Properties 中定义的WEB_ROOT目录下，放一些图片，文本，html，使用localhost:8080/xxx访问试试看

这里写图片描述

0 0