JavaWeb实现用户登录注册功能实例代码(基于Servlet+JSP+JavaBean模式)

package me.gacl.domain;import java.io.Serializable;import java.util.Date;/*** @author gacl* 用户实体类*/public class User implements Serializable {private static final long serialVersionUID = -L;// 用户IDprivate String id;// 用户名private String userName;// 用户密码private String userPwd;// 用户邮箱private String email;// 用户生日private Date birthday;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPwd() {return userPwd;}public void setUserPwd(String userPwd) {this.userPwd = userPwd;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}}

package me.gacl.dao;import me.gacl.domain.User;public interface IUserDao {/*** 根据用户名和密码来查找用户* @param userName* @param userPwd* @return 查到到的用户*/User find(String userName, String userPwd);/*** 添加用户* @param user*/void add(User user);/**根据用户名来查找用户* @param userName* @return 查到到的用户*/User find(String userName);}

package me.gacl.dao.impl;import java.text.SimpleDateFormat;import org.domj.Document;import org.domj.Element;import me.gacl.dao.IUserDao;import me.gacl.domain.User;import me.gacl.util.XmlUtils;/*** IUserDao接口的实现类* @author gacl*/public class UserDaoImpl implements IUserDao {@Overridepublic User find(String userName, String userPwd) {try{Document document = XmlUtils.getDocument();//使用XPath表达式来操作XML节点Element e = (Element) document.selectSingleNode("//user[@userName='"+userName+"' and @userPwd='"+userPwd+"']");if(e==null){return null;}User user = new User();user.setId(e.attributeValue("id"));user.setEmail(e.attributeValue("email"));user.setUserPwd(e.attributeValue("userPwd"));user.setUserName(e.attributeValue("userName"));String birth = e.attributeValue("birthday");SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");user.setBirthday(sdf.parse(birth));return user;}catch (Exception e) {throw new RuntimeException(e);}}@SuppressWarnings("deprecation")@Overridepublic void add(User user) {try{Document document = XmlUtils.getDocument();Element root = document.getRootElement();Element user_node = root.addElement("user"); //创建user结点，并挂到rootuser_node.setAttributeValue("id", user.getId());user_node.setAttributeValue("userName", user.getUserName());user_node.setAttributeValue("userPwd", user.getUserPwd());user_node.setAttributeValue("email", user.getEmail());SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");user_node.setAttributeValue("birthday", sdf.format(user.getBirthday()));XmlUtils.writeXml(document);}catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic User find(String userName) {try{Document document = XmlUtils.getDocument();Element e = (Element) document.selectSingleNode("//user[@userName='"+userName+"']");if(e==null){return null;}User user = new User();user.setId(e.attributeValue("id"));user.setEmail(e.attributeValue("email"));user.setUserPwd(e.attributeValue("userPwd"));user.setUserName(e.attributeValue("userName"));String birth = e.attributeValue("birthday");SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");user.setBirthday(sdf.parse(birth));return user;}catch (Exception e) {throw new RuntimeException(e);}}}

package me.gacl.service;import me.gacl.domain.User;import me.gacl.exception.UserExistException;public interface IUserService {/*** 提供注册服务* @param user* @throws UserExistException*/void registerUser(User user) throws UserExistException;/*** 提供登录服务* @param userName* @param userPwd* @return*/User loginUser(String userName, String userPwd);}

package me.gacl.service.impl;import me.gacl.dao.IUserDao;import me.gacl.dao.impl.UserDaoImpl;import me.gacl.domain.User;import me.gacl.exception.UserExistException;import me.gacl.service.IUserService;public class UserServiceImpl implements IUserService {private IUserDao userDao = new UserDaoImpl();@Overridepublic void registerUser(User user) throws UserExistException {if (userDao.find(user.getUserName())!=null) {//checked exception //unchecked exception//这里抛编译时异常的原因：是我想上一层程序处理这个异常，以给用户一个友好提示throw new UserExistException("注册的用户名已存在！！！");}userDao.add(user);}@Overridepublic User loginUser(String userName, String userPwd) {return userDao.find(userName, userPwd);}}

package me.gacl.web.UI;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/*** @author gacl* 为用户提供注册的用户界面的Servlet* RegisterUIServlet负责为用户输出注册界面* 当用户访问RegisterUIServlet时，就跳转到WEB-INF/pages目录下的register.jsp页面*/public class RegisterUIServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.getRequestDispatcher("/WEB-INF/pages/register.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

<%@ page language="java" pageEncoding="UTF-"%><!DOCTYPE HTML><html><head><title>用户注册</title></head><body style="text-align: center;"><form action="${pageContext.request.contextPath}/servlet/RegisterServlet" method="post"><table width="%" border=""><tr><td>用户名</td><td><input type="text" name="userName"></td></tr><tr><td>密码</td><td><input type="password" name="userPwd"></td></tr><tr><td>确认密码</td><td><input type="password" name="confirmPwd"></td></tr><tr><td>邮箱</td><td><input type="text" name="email"></td></tr><tr><td>生日</td><td><input type="text" name="birthday"></td></tr><tr><td><input type="reset" value="清空"></td><td><input type="submit" value="注册"></td></tr></table></form></body></html>

package me.gacl.web.formbean;import java.util.HashMap;import java.util.Map;import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;/*** 封装的用户注册表单bean，用来接收register.jsp中的表单输入项的值* RegisterFormBean中的属性与register.jsp中的表单输入项的name一一对应* RegisterFormBean的职责除了负责接收register.jsp中的表单输入项的值之外还担任着校验表单输入项的值的合法性* @author gacl**/public class RegisterFormBean {//RegisterFormBean中的属性与register.jsp中的表单输入项的name一一对应//<input type="text" name="userName"/>private String userName;//<input type="password" name="userPwd"/>private String userPwd;//<input type="password" name="confirmPwd"/>private String confirmPwd;//<input type="text" name="email"/>private String email;//<input type="text" name="birthday"/>private String birthday;/*** 存储校验不通过时给用户的错误提示信息*/private Map<String, String> errors = new HashMap<String, String>();public Map<String, String> getErrors() {return errors;}public void setErrors(Map<String, String> errors) {this.errors = errors;}/** validate方法负责校验表单输入项* 表单输入项校验规则：* private String userName; 用户名不能为空，并且要是-的字母 abcdABcd * private String userPwd; 密码不能为空，并且要是-的数字* private String confirmPwd; 两次密码要一致* private String email; 可以为空，不为空要是一个合法的邮箱 * private String birthday; 可以为空，不为空时，要是一个合法的日期*/public boolean validate() {boolean isOk = true;if (this.userName == null || this.userName.trim().equals("")) {isOk = false;errors.put("userName", "用户名不能为空！！");} else {if (!this.userName.matches("[a-zA-Z]{,}")) {isOk = false;errors.put("userName", "用户名必须是-位的字母！！");}}if (this.userPwd == null || this.userPwd.trim().equals("")) {isOk = false;errors.put("userPwd", "密码不能为空！！");} else {if (!this.userPwd.matches("//d{,}")) {isOk = false;errors.put("userPwd", "密码必须是-位的数字！！");}}// private String password; 两次密码要一致if (this.confirmPwd != null) {if (!this.confirmPwd.equals(this.userPwd)) {isOk = false;errors.put("confirmPwd", "两次密码不一致！！");}}// private String email; 可以为空，不为空要是一个合法的邮箱if (this.email != null && !this.email.trim().equals("")) {if (!this.email.matches("//w+@//w+(//.//w+)+")) {isOk = false;errors.put("email", "邮箱不是一个合法邮箱！！");}}// private String birthday; 可以为空，不为空时，要是一个合法的日期if (this.birthday != null && !this.birthday.trim().equals("")) {try {DateLocaleConverter conver = new DateLocaleConverter();conver.convert(this.birthday);} catch (Exception e) {isOk = false;errors.put("birthday", "生日必须要是一个日期！！");}}return isOk;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPwd() {return userPwd;}public void setUserPwd(String userPwd) {this.userPwd = userPwd;}public String getConfirmPwd() {return confirmPwd;}public void setConfirmPwd(String confirmPwd) {this.confirmPwd = confirmPwd;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getBirthday() {return birthday;}public void setBirthday(String birthday) {this.birthday = birthday;}}

package me.gacl.util;import java.util.Enumeration;import java.util.UUID;import javax.servlet.http.HttpServletRequest;import org.apache.commons.beanutils.BeanUtils;/*** @author gacl* 把request对象中的请求参数封装到bean中*/public class WebUtils {/*** 将request对象转换成T对象* @param request * @param clazz* @return*/public static <T> T requestBean(HttpServletRequest request,Class<T> clazz){try{T bean = clazz.newInstance();Enumeration<String> e = request.getParameterNames(); while(e.hasMoreElements()){String name = (String) e.nextElement();String value = request.getParameter(name);BeanUtils.setProperty(bean, name, value);}return bean;}catch (Exception e) {throw new RuntimeException(e);}}/*** 生成UUID* @return*/public static String makeId(){return UUID.randomUUID().toString();}}

package me.gacl.web.controller;import java.io.IOException;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.beanutils.ConvertUtils;import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;import me.gacl.domain.User;import me.gacl.exception.UserExistException;import me.gacl.service.IUserService;import me.gacl.service.impl.UserServiceImpl;import me.gacl.util.WebUtils;import me.gacl.web.formbean.RegisterFormBean;/*** 处理用户注册的Servlet* @author gacl**/public class RegisterServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//将客户端提交的表单数据封装到RegisterFormBean对象中RegisterFormBean formbean = WebUtils.requestBean(request,RegisterFormBean.class);//校验用户注册填写的表单数据if (formbean.validate() == false) {//如果校验失败//将封装了用户填写的表单数据的formbean对象发送回register.jsp页面的form表单中进行显示request.setAttribute("formbean", formbean);//校验失败就说明是用户填写的表单数据有问题，那么就跳转回register.jsprequest.getRequestDispatcher("/WEB-INF/pages/register.jsp").forward(request, response);return;}User user = new User();try {// 注册字符串到日期的转换器ConvertUtils.register(new DateLocaleConverter(), Date.class);BeanUtils.copyProperties(user, formbean);//把表单的数据填充到javabean中user.setId(WebUtils.makeId());//设置用户的Id属性IUserService service = new UserServiceImpl();//调用service层提供的注册用户服务实现用户注册service.registerUser(user);String message = String.format("注册成功！！秒后为您自动跳到登录页面！！<meta http-equiv='refresh' content=';url=%s'/>", request.getContextPath()+"/servlet/LoginUIServlet");request.setAttribute("message",message);request.getRequestDispatcher("/message.jsp").forward(request,response);} catch (UserExistException e) {formbean.getErrors().put("userName", "注册用户已存在！！");request.setAttribute("formbean", formbean);request.getRequestDispatcher("/WEB-INF/pages/register.jsp").forward(request, response);} catch (Exception e) {e.printStackTrace(); // 在后台记录异常request.setAttribute("message", "对不起，注册失败！！");request.getRequestDispatcher("/message.jsp").forward(request,response);}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

<%@ page language="java" pageEncoding="UTF-"%><!DOCTYPE HTML><html><head><title>用户注册</title></head><body style="text-align: center;"><form action="${pageContext.request.contextPath}/servlet/RegisterServlet" method="post"><table width="%" border=""><tr><td>用户名</td><td><%--使用EL表达式${}提取存储在request对象中的formbean对象中封装的表单数据(formbean.userName)以及错误提示消息(formbean.errors.userName)--%><input type="text" name="userName" value="${formbean.userName}">${formbean.errors.userName}</td></tr><tr><td>密码</td><td><input type="password" name="userPwd" value="${formbean.userPwd}">${formbean.errors.userPwd}</td></tr><tr><td>确认密码</td><td><input type="password" name="confirmPwd" value="${formbean.confirmPwd}">${formbean.errors.confirmPwd}</td></tr><tr><td>邮箱</td><td><input type="text" name="email" value="${formbean.email}">${formbean.errors.email}</td></tr><tr><td>生日</td><td><input type="text" name="birthday" value="${formbean.birthday}">${formbean.errors.birthday}</td></tr><tr><td><input type="reset" value="清空"></td><td><input type="submit" value="注册"></td></tr></table></form></body></html>

package me.gacl.web.UI;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/*** @author gacl* LoginUIServlet负责为用户输出登陆界面* 当用户访问LoginUIServlet时，就跳转到WEB-INF/pages目录下的login.jsp页面*/public class LoginUIServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.getRequestDispatcher("/WEB-INF/pages/login.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

<%@ page language="java" pageEncoding="UTF-"%><!DOCTYPE HTML><html><head><title>用户登陆</title></head><body><form action="${pageContext.request.contextPath }/servlet/LoginServlet" method="post">用户名：<input type="text" name="username"><br/>密码：<input type="password" name="password"><br/><input type="submit" value="登陆"></form></body></html>

package me.gacl.web.controller;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import me.gacl.domain.User;import me.gacl.service.IUserService;import me.gacl.service.impl.UserServiceImpl;/*** 处理用户登录的servlet* @author gacl**/public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//获取用户填写的登录用户名String username = request.getParameter("username");//获取用户填写的登录密码String password = request.getParameter("password");IUserService service = new UserServiceImpl();//用户登录User user = service.loginUser(username, password);if(user==null){String message = String.format("对不起，用户名或密码有误！！请重新登录！秒后为您自动跳到登录页面！！<meta http-equiv='refresh' content=';url=%s'", request.getContextPath()+"/servlet/LoginUIServlet");request.setAttribute("message",message);request.getRequestDispatcher("/message.jsp").forward(request, response);return;}//登录成功后，就将用户存储到session中request.getSession().setAttribute("user", user);String message = String.format("恭喜：%s,登陆成功！本页将在秒后跳到首页！！<meta http-equiv='refresh' content=';url=%s'", user.getUserName(),request.getContextPath()+"/index.jsp");request.setAttribute("message",message);request.getRequestDispatcher("/message.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

package me.gacl.web.controller;import java.io.IOException;import java.text.MessageFormat;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LogoutServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//移除存储在session中的user对象，实现注销功能request.getSession().removeAttribute("user");//由于字符串中包含有单引号，在这种情况下使用MessageFormat.format方法拼接字符串时就会有问题//MessageFormat.format方法只是把字符串中的单引号去掉，不会将内容填充到指定的占位符中String tempStr = MessageFormat.format("注销成功！！秒后为您自动跳到登录页面！！<meta http-equiv='refresh' content=';url={}'/>", request.getContextPath()+"/servlet/LoginUIServlet");System.out.println(tempStr);//输出结果：注销成功！！秒后为您自动跳到登录页面！！<meta http-equiv=refresh content=;url={}/>System.out.println("---------------------------------------------------------");/*** 要想解决"如果要拼接的字符串包含有单引号，那么MessageFormat.format方法就只是把字符串中的单引号去掉，不会将内容填充到指定的占位符中"这个问题，* 那么可以需要使用单引号引起来的字符串中使用个单引号引起来，例如："<meta http-equiv=''refresh'' content='';url={}''/>"* 这样MessageFormat.format("<meta http-equiv=''refresh'' content='';url={}''/>","index.jsp")就可以正常返回* <meta http-equiv=''refresh'' content='';url=index.jsp'/>*/String tempStr = MessageFormat.format("注销成功！！秒后为您自动跳到登录页面！！<meta http-equiv=''refresh'' content='';url={}''/>", request.getContextPath()+"/servlet/LoginUIServlet");/*** 输出结果：* 注销成功！！秒后为您自动跳到登录页面！！* <meta http-equiv='refresh' content=';url=/webmvcframework/servlet/LoginUIServlet'/>*/System.out.println(tempStr);String message = String.format("注销成功！！秒后为您自动跳到登录页面！！<meta http-equiv='refresh' content=';url=%s'/>", request.getContextPath()+"/servlet/LoginUIServlet");request.setAttribute("message",message);request.getRequestDispatcher("/message.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

<%@ page language="java" pageEncoding="UTF-"%><%--为了避免在jsp页面中出现java代码，这里引入jstl标签库，利用jstl标签库提供的标签来做一些逻辑判断处理 --%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><!DOCTYPE HTML><html><head><title>首页</title><script type="text/javascript">function doLogout(){//访问LogoutServlet注销当前登录的用户window.location.href="${pageContext.request.contextPath}/servlet/LogoutServlet";}</script></head><body><h>孤傲苍狼的网站</h><hr/><c:if test="${user==null}"><a href="${pageContext.request.contextPath}/servlet/RegisterUIServlet" target="_blank">注册</a><a href="${pageContext.request.contextPath}/servlet/LoginUIServlet">登陆</a></c:if><c:if test="${user!=null}">欢迎您：${user.userName}<input type="button" value="退出登陆" onclick="doLogout()"></c:if><hr/></body></html>