servlet+javabean+service+dao完成注册登录

domain

package cn.code.domain;/** 实体类* */public class User {private String username;private String password;private String verifyCode;@Overridepublic String toString() {return "User [username=" + username + ", password=" + password+ ", verifyCode=" + verifyCode + "]";}public User(String username, String password, String verifyCode) {super();this.username = username;this.password = password;this.verifyCode = verifyCode;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getVerifyCode() {return verifyCode;}public void setVerifyCode(String verifyCode) {this.verifyCode = verifyCode;}public User() {}}

dao

package cn.code.dao;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import cn.code.domain.User;/*** 数据类* */public class UserDao {private String path="G:/users.xml";public User findByUsername(String username){/*** 得到Document* xpath查询* 校验查询结果是否为null，如果为null，返回null;* 如果不为null，需要把Element封装到user对象中。* */SAXReader r = new SAXReader();try{Document document = r.read(path);Element element = (Element) document.selectSingleNode("//user[@username='"+username+"']");if(element==null){return null;}User user = new User();String attrUsername = element.attributeValue("username");String attrPassword = element.attributeValue("password");user.setUsername(attrUsername);user.setPassword(attrPassword);return user;}catch(Exception e){throw new RuntimeException(e);}}public void add(User user){/*** 得到document* 通过document得到root元素！* 将参数user转换成user标签* 添加属性并赋值* 保存document* */SAXReader reader = new SAXReader();try {Document document = reader.read(path);Element root = document.getRootElement();Element userEle = root.addElement("user");userEle.addAttribute("username", user.getUsername());userEle.addAttribute("password", user.getPassword());OutputFormat format = OutputFormat.createPrettyPrint();// OutputFormat format = new OutputFormat("\t",true);//缩进，是否换行// format.setTrimText(true);//清空所有换行跟缩进 XMLWriter writer = null;try {writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(path),"utf-8"),format); //注意字符编码，默认使用电脑默认编码保存，这里我们使用utf-8；} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {writer.write(document);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {writer.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (DocumentException e) {throw new RuntimeException(e);}}}

service

package cn.code.service;import cn.code.dao.UserDao;import cn.code.domain.User;public class UserService {private UserDao userDao = new UserDao();public void regist(User user)throws UserException{/*** 使用用户名去查询，如果返回null，完成添加* 如果返回布市null，抛出异常！* */User u = userDao.findByUsername(user.getUsername());if(u!=null)throw new UserException("用户名"+user.getUsername()+"已经被注册！");userDao.add(user);}public User login(User user) throws UserException {User u = userDao.findByUsername(user.getUsername());if(u==null)throw new UserException("用户名不存在！");if(!u.getPassword().equals(user.getPassword())){throw new UserException("密码错误");}return u;}}

package cn.code.service;public class UserException extends Exception {/*** */private static final long serialVersionUID = 1L;public UserException() {super();// TODO Auto-generated constructor stub }public UserException(String message) {super(message);// TODO Auto-generated constructor stub }}

servlet

package cn.code.web.servlet;import java.io.IOException;import java.util.HashMap;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import monUtils;import cn.code.domain.User;import cn.code.service.UserException;import cn.code.service.UserService;public class RegistServlet extends HttpServlet {/*** */private static final long serialVersionUID = 1L;public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");/*** 封装表单数据(封装到user对象中)* */User user = CommonUtils.toBean(request.getParameterMap(), User.class);/*** 表单校验* */String sessionVerifyCode = (String)request.getSession().getAttribute("session_vcode");// if(!sessionVerifyCode.equalsIgnoreCase(user.getVerifyCode())){// request.setAttribute("msg", "验证码不一致");// request.setAttribute("user", user);// request.getRequestDispatcher("/regist.jsp").forward(request, response);// return;// }String username = user.getUsername();String password = user.getPassword();Map<String,String>errors = new HashMap<String, String>();if(username==null||username.trim().isEmpty()){errors.put("username", "用户名不能为空");}else if(username.length()<3||username.length()>15){errors.put("username", "请输入3-15为用户名");}if(password==null||password.trim().isEmpty()){errors.put("password", "用户名不能为空");}else if(password.length()<3||password.length()>15){errors.put("password", "请输入3-15为用户名");}if(!sessionVerifyCode.equalsIgnoreCase(user.getVerifyCode())){errors.put("msg", "验证码不一致");}if(errors!=null&&errors.size()>0){request.setAttribute("errors", errors);request.setAttribute("user", user);request.getRequestDispatcher("/regist.jsp").forward(request, response);return;}UserService userService = new UserService();try {userService.regist(user);response.getWriter().print("注册成功！<a href='"+request.getContextPath()+"/login.jsp"+"'>登录</a>");} catch (UserException e) {request.setAttribute("msg", e.getMessage());request.setAttribute("user", user);request.getRequestDispatcher("/regist.jsp").forward(request, response);}}}

package cn.code.web.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import monUtils;import cn.code.domain.User;import cn.code.service.UserException;import cn.code.service.UserService;public class LoginServlet extends HttpServlet {/*** */private static final long serialVersionUID = 1L;public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");//请求编码response.setContentType("text/html;charset=utf-8");//响应编码//依赖UserService/*** 封装表单数据到user* 调用sevice的login()方法，得到返回的user对象*如果抛出异常：获取异常信息，保存到request域中，再保存user，转发到login.jsp*如果没有异常;保存返回值到session中，重定向到welcome.jsp* */User user =CommonUtils.toBean(request.getParameterMap(), User.class);UserService userService = new UserService();try{User u= userService.login(user);request.getSession().setAttribute("sessionUser", u);response.sendRedirect(request.getContextPath()+"/index.jsp");}catch(UserException e){request.setAttribute("msg", e.getMessage());request.setAttribute("user", user);request.getRequestDispatcher("/login.jsp").forward(request, response);}}}

package cn.code.web.servlet;import java.awt.image.BufferedImage;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.code.image.VerifyCode;public class VerifyCodeServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//验证码类VerifyCode vc = new VerifyCode();//生成图片BufferedImage image = vc.getImage();//保存图片文本到session中request.getSession().setAttribute("session_vcode", vc.getText());//把图片响应给客户端 VerifyCode.output(image, response.getOutputStream());}}

验证码类

package cn.code.image;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;public class VerifyCode {private int w=70;private int h=35;private Random r = new Random();private String[] fontNames = {"宋体","华文楷体","黑体","微软雅黑","楷体_GB2321"};private String codes = "23456789abcdefghjkmnopqrstuvwxyzQWERTYUIOPASDFGHJKLZXCVBNM";private Color bgColor = new Color(255,255,255);//颜色类对象，背景色白色private String text;//生成随机颜色private Color randomColor(){int red = r.nextInt(150);int green = r.nextInt(150);int blue = r.nextInt(150);return new Color(red,green,blue);}//生成随机字体private Font randomFont(){int index = r.nextInt(fontNames.length);String fontName = fontNames[index];//生成随机的字体名称int style = r.nextInt(4);//生成随机样式，0（无样式），1（粗体），2（斜体），3（粗体+斜体）int size = r.nextInt(5)+24;//生成随机字号，24-28return new Font(fontName,style,size);}//画干扰线private void drawLine(BufferedImage image){int num = 3;//一共画三条Graphics2D g2 = (Graphics2D)image.getGraphics();for(int i = 0;i<num;i++){//生成2个点的坐标，即4个值；int x1 = r.nextInt(w);int y1 = r.nextInt(h);int x2 = r.nextInt(w);int y2 = r.nextInt(h);g2.setStroke(new BasicStroke(1.5F));g2.setColor(Color.BLUE);//干扰线是蓝色g2.drawLine(x1, y1, x2, y2);//画线 }}//随机生成一个字符private char randomChar(){int index = r.nextInt(codes.length());return codes.charAt(index);}//创建bufferedImageprivate BufferedImage createImage(){BufferedImage image = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);Graphics2D g2 = (Graphics2D)image.getGraphics();g2.setColor(this.bgColor);g2.fillRect(0, 0, w, h);return image;}//外界调用这个方法得到验证码public BufferedImage getImage(){//创建图片缓冲区BufferedImage image = createImage();//得到绘制环境Graphics2D g2 = (Graphics2D)image.getGraphics();//用来装载生成的验证码文本StringBuilder sb = new StringBuilder();//向图片中画4个字符for(int i = 0;i<4;i++){String s = randomChar()+"";//随机生成一个字符sb.append(s);//把字母添加到sb中float x = i * 1.0F * w / 4;//设置当前字符x轴坐标g2.setFont(randomFont());//设置随即字体g2.setColor(randomColor());//设置随机颜色g2.drawString(s,x,h-5);//画图 }this.text=sb.toString();//把生成的字符串赋给this.textdrawLine(image);//添加干扰线return image;}//返回验证码图片上的文本public String getText(){return text;}//保存图片到指定的输出流public static void output(BufferedImage image,OutputStream out) throws IOException{ImageIO.write(image, "JPEG", out);}}

jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'regist.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript">function change(){var ele = document.getElementById("vCode");ele.src="<c:url value='/servlet/VerifyCodeServlet'/>?xxx="+new Date().getTime();//alert(ele.src); }</script></head><body><h1>注册</h1><p style="color:red;font=weigth:900">${msg}</p><!-- ${pageContext.request.contextPath}/RegistServlet } --><form action="<c:url value='/RegistServlet'/>" method="post">用户名:<input type="text" name="username" value='${user.username}'/>${errors.username}<br/>密码:<input type="password" name="password" value="${user.password}"/>${errors.password}<br/>验证码：<input type="text" name="verifyCode" value="${user.verifyCode }" size="3"/><img id="vCode" src="<c:url value='/servlet/VerifyCodeServlet' /> "/><a href="javascript:change()">换一张</a><br/><input type="submit" value="注册"/></form></body></html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'login.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><h1>登录</h1><p>${msg}</p><form action=<c:url value='/LoginServlet'/> method="post">用户名:<input type="text" name="username" value='${user.username}'/><br/>密码:<input type="password" name="password" value="${user.password}"/><br/><input type="submit" value="登录"/></form></body></html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="f" uri="/jsp/jstl/fmt" %><%@ taglib prefix="c" uri="/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><h1>欢迎登录本网站：</h1><c:choose><c:when test="${empty sessionScope.sessionUser }">请先登录</c:when><c:otherwise>${sessionScope.sessionUser }</c:otherwise></c:choose></body></html>