web服务器底层代码

package com.lovo;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;public class WebServer {public static boolean isRun = true;public WebServer() {try {ServerSocket server = new ServerSocket(8088); // 开启服务器并开放8088端口while (isRun) {// 监听端口,一旦有客户端连接到服务器，就将客户端的信息封装成socket对象Socket socket = server.accept();new DisposeSocket(socket);}} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {new WebServer();}}

package com.lovo;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;import com.lovo.service.ServiceFactory;import com.lovo.service.Servlet;public class DisposeSocket extends Thread {private Socket socket;public DisposeSocket(Socket socket) {this.socket = socket;this.start();}public void run() {try {InputStream in = socket.getInputStream();// 从socket中得到读取流，用于接收数据Request request = new Request(in);// 将读取流封装成请求对象System.out.println(request);OutputStream out = socket.getOutputStream();// 从socket中得到写入流，用于发送数据Response response = new Response(out);// 将写入流封装成Response响应对象String url = request.getUrl();// 得到URLServlet s = ServiceFactory.getServlet(url);// 调用工厂类，得到Servlet接口对象if (s != null) {// 请求的是业务组件s.service(request, response);// 调用service方法，完成业务方法的调用} else {// 请求的是文件response.sendFile(url);}out.flush();socket.close();} catch (Exception e) {e.printStackTrace();}}}

package com.lovo;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.util.HashMap;import java.util.Map;/** * 封装socket读取流的请求对象 *  * @author Administrator *  */public class Request {private InputStream in;/** 用户请求的路径 */private String url;/** 请求参数的Map集合 */private Map<String, String> paramMap = new HashMap<String, String>();public Request(InputStream in) {this.in = in;try {byte[] by = new byte[1024];in.read(by);// 将客户端读取的数据放在by中String str = new String(by).trim();// 将字节数组封装成字符串System.out.println(str);if (str.startsWith("GET")) {// 处理get请求this.pressGet(str);} else if (str.startsWith("POST")) {this.pressPost(str);}} catch (IOException e) {e.printStackTrace();}}/** * 处理GET请求 *  * @param str *            请求参数 */private void pressGet(String str) {String[] sts = str.split("\\s+");if (sts[1].indexOf("?") != -1) {// 请求的业务组建String[] temp = sts[1].split("[?]");// 按?拆分，第一个元素是URL,第二个是请求元素this.url = temp[0].substring(1);// 得到urlthis.fullMap(temp[1]);} else {// 请求的是文件this.url = sts[1].substring(1);// 得到url}}/** * 处理POST请求 *  * @param str *            请求参数 */private void pressPost(String str) {String[] temp = str.split("\\s+");this.url = temp[1].substring(1);this.fullMap(temp[temp.length - 1]);}/** * 将请求字符串封装成Map集合 *  * @param str */private void fullMap(String str) {try {str = URLDecoder.decode(str, "gbk");// 解码，将ISO8859-1解码为中文字} catch (UnsupportedEncodingException e) {e.printStackTrace();}String[] temp = str.split("&");for (String s : temp) {String[] p = s.split("=");if (p.length == 2) {this.paramMap.put(p[0], p[1]);// 将键值对加入集合} else if (p.length == 1) {this.paramMap.put(p[0], "");}}}public String getUrl() {return url;}/** *  * @param key * @return */public String getParameter(String key) {return this.paramMap.get(key);}public String toString() {return "url:" + url + "  " + "请求参数：" + this.paramMap;}}

package com.lovo;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;/** * 向客户端发送信息的响应对象 *  * @author Administrator *  */public class Response {/** 从socket中得到的写入流 */private OutputStream out;public Response(OutputStream out) {this.out = out;}/** * 向客户端发送文本消息 *  * @param str */public void sendMessage(String str) {try {out.write(str.getBytes());} catch (IOException e) {e.printStackTrace();}}/** * 向客户端发送文件消息 *  * @param filePath *            文件路径 */public void sendFile(String filePath) {File f = new File(filePath);if (!f.exists()) {return;}InputStream fin = null;try {fin = new FileInputStream(filePath);// 从文件中读取数据，写入到out中，由于out是从socket中得到的，输出的地点就是客户端byte[] by = new byte[1024];int len = 0;while ((len = fin.read(by)) != -1) {out.write(by, 0, len);}} catch (Exception e) {e.printStackTrace();} finally {try {fin.close();} catch (IOException e) {e.printStackTrace();}}}}

package com.lovo.service;import com.lovo.Request;import com.lovo.Response;public interface Servlet {/** * 业务方法 *  * @param request *            请求对象 * @param response *            响应对象 */public void service(Request request, Response response);}

package com.lovo.service;import com.lovo.Request;import com.lovo.Response;import com.lovo.bean.UserBean;import com.lovo.dao.IUserDao;import com.lovo.dao.impl.UserDaoImpl;/** * 登陆的业务组件 *  * @author Administrator *  */public class LoginService implements Servlet {IUserDao dao = new UserDaoImpl();/** * 业务方法 *  * @param request *            请求对象 * @param response *            响应对象 */public void service(Request request, Response response) {//实体类，dao层，省略UserBean bean = dao.login(request.getParameter("userName"),request.getParameter("pwd"));if (bean != null) {// 登陆成功response.sendFile("index.html");} else {// 登陆失败response.sendFile("loginError.html");}}}

package com.lovo.service;import com.lovo.Request;import com.lovo.Response;import com.lovo.bean.UserBean;import com.lovo.dao.IUserDao;import com.lovo.dao.impl.UserDaoImpl;/** * 注册业务组件 *  * @author Administrator *  */public class RegisterService implements Servlet {/** 持久化业务组件 */private IUserDao dao = new UserDaoImpl();/** * 注册业务方法 *  * @param request *            请求对象 * @param response *            响应对象 */public void service(Request request, Response response) {String pwd = request.getParameter("pwd");String rePwd = request.getParameter("repwd");if (!pwd.equals(rePwd)) {response.sendMessage("两次密码不一致</br>");response.sendMessage("<a href='register.html'> 重新注册</a>");return;}// 创建实体类，封装页面数据UserBean bean = new UserBean();bean.setUserName(request.getParameter("userName"));bean.setPwd(pwd);bean.setSex(request.getParameter("sex"));bean.setEdu(request.getParameter("edu"));dao.add(bean);response.sendMessage("注册成功</br>");response.sendMessage("<a href='1.html'> 重新登陆</a>");}}

package com.lovo.service;import java.io.FileReader;import java.util.Properties;/** * 业务组件工厂类 *  * @author Administrator *  */public class ServiceFactory {private static Properties pro = new Properties();static {try {pro.load(new FileReader("web.txt"));} catch (Exception e) {e.printStackTrace();}}/** * 根据URL,得到处理该URL的业务组件 *  * @param url * @return */public static Servlet getServlet(String url) {String className = pro.getProperty(url); // 根据键，得到值if (className == null) {return null;}try {Class c = Class.forName(className);// 加载类得到了类模板Object obj = c.newInstance();// 产生该类的对象return (Servlet) obj;} catch (Exception e) {e.printStackTrace();}return null;}}