1依据index.jsp我们首先制定了注册的功能,当点击注册button什么时候。超链接到注册页面。下面是一个注册jsp页

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function changeImage(image){
image.src=image.src+"? time"+new Date().getTime();
}
</script> <title></title> <meta http-equiv=" pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> </head> <body style="text-align: center">
<h1>我的站点_注冊</h1>
<font color="red">${msg }</font>
<form action="${pageContext.request.contextPath }/servlet/RegistServlet" method="post">
<table border="1" cellspacing="0" align="center">
<tr>
<td>用户名</td>
<td><input type="text" name="username" value="${param.username }"/></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="password2"/></td>
</tr>
<tr>
<td>昵称</td>
<td><input type="text" name="nickname" value="${param.nickname }"/></td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="text" name="email" value="${param.email }"/></td>
</tr>
<tr>
<td>验证码</td>
<td><input type="text" name="valistr" /></td>
</tr>
<tr>
<td><input type="submit" value="注冊" /></td>
<td><img src="${pageContext.request.contextPath }/servlet/ValiImage" style="cursor: pointer" onclick="changeImage(this)"/></td>
</tr>
</table>
</form>
</body>
</html>

执行界面示意图:

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDAxMDc2OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

2.完毕验证码的功能建立ValiImage的servlet的类,把字符串保存到session域中,为了一会在RegistServlet中跟用户输入的验证码进行比較

package cn.itheima.web;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random; import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class ValiImage extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//告知浏览器不缓存
response.setDateHeader("Expires", -1);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
int height=30;
int width=130;
//1.得到内存中的图片
BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//2.得到画布
Graphics2D g = (Graphics2D) image.getGraphics();
//3.填充背景色
g.setColor(Color.LIGHT_GRAY);
g.fillRect(0, 0, width, height);
//4.画一个矩形
g.setColor(Color.black);
g.drawRect(0, 0, width-1, height-1);
//5.随机斜线
for(int i=0;i<4;i++){
g.setColor(Color.RED);
g.drawLine(randNum(0,width), randNum(0,height), randNum(0,width), randNum(0,height));
}
//6.随机写一个汉字
String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
StringBuffer buffer=new StringBuffer();
for(int i=0;i<4;i++){
g.setColor(Color.black);
int r=randNum(-45, 45);
g.rotate(1.0*r/180*Math.PI, 5+30*i, 21);//旋转ת
g.setFont(new Font("red", Font.BOLD, 15));
String s=base.charAt(randNum(0, base.length()-1))+"";
g.drawString(s, 5+30*i, 21);
buffer.append(s);
g.rotate(1.0*-r/180*Math.PI, 5+30*i, 21);//旋转的是画布,因此旋转完,要归位
}
request.getSession().setAttribute("valistr", buffer.toString());
System.out.println(buffer.toString());
//将指定格式的文件输出到response缓冲区
ImageIO.write(image, "jpg", response.getOutputStream());
}
//随机产生begin--end 之间的数字
public int randNum(int begin,int end){
Random rand=new Random();
return rand.nextInt(end-begin)+begin;//5-10 10-5=5 5+5=10
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
} }

3.建立RegistServlet实现对应的功能

package cn.itheima.web;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import cn.itheima.domain.User;
import cn.itheima.exception.MsgException;
import cn.itheima.service.UserSevice; import com.sun.org.apache.commons.beanutils.BeanUtils; public class RegistServlet extends HttpServlet { UserSevice service = new UserSevice(); public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
// 1.验证验证码
String valistr = request.getParameter("valistr");
String valistr2 = (String) request.getSession().getAttribute(
"valistr"); if (valistr == null || valistr2 == null ||!valistr.equals(valistr2)) {
request.setAttribute("msg", "验证码不对");
request.getRequestDispatcher("/regist.jsp").forward(request,
response);
return;
}
// 2.封装数据校验数据
User user = new User(); BeanUtils.populate(user, request.getParameterMap());
user.check();
// 3.加入到数据库中
service.registUser(user);
request.getSession().setAttribute("user", user);//登陆
// 4.3秒后跳转到主页
response.getWriter().write("恭喜您注冊成功!三秒后跳转到主页");
response.setHeader("refresh", "3;url=" + request.getContextPath()
+ "/index.jsp");
} catch (MsgException e) {
request.setAttribute("msg", e.getMessage());
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}catch (Exception e) {
e.printStackTrace();
throw new RuntimeException();
} } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
} }

假设抛出异常。就走catch中的代码块,将msg放到request域中,等到回到regist.jsp中进行友好的提示。假设成功注冊,那么就把用户放到session域中

执行界面:

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDAxMDc2OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDAxMDc2OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

4.依据index,jsp完毕注销的功能,LogoutServlet然后重定向到主页。

package cn.itheima.web;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext; public class LogoutServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if(request.getSession(false)!=null&&request.getSession().getAttribute("user")!=null){
request.getSession().invalidate();
}
response.sendRedirect(request.getContextPath()+"/index.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
} }

执行结果示意图:

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDAxMDc2OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

5.完毕登录功能建立login.jsp

<%@page import="java.net.URLDecoder"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://www.itheima.com/simple/mytag" prefix="s" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head> <title></title> <meta http-equiv=" pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> </head> <body>
<div align="center">
<h1>我的站点_登陆</h1>
<font color="red">${msg }</font>
<hr>
<form action="${pageContext.request.contextPath}/servlet/LoginSevlet" method="post">
<table border="1">
<tr>
<td>username</td>
<td><input type="text" name="username" value='<s:decode encoding="utf-8" str="${cookie.remname.value}"/>'/></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td><input type="submit" value="登录"/></td>
<td><input type="checkbox" name="remname" value="OK" />记住username</td>
</tr>
</table>
</form>
</div>
</body>
</html>

执行界面示意图;

5.LoginSevlet

package cn.itheima.web;

import java.io.IOException;
import java.net.URLEncoder; import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext; import cn.itheima.domain.User;
import cn.itheima.service.UserSevice; public class LoginSevlet extends HttpServlet {
UserSevice service=new UserSevice();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//1.得到username与password
String username = request.getParameter("username");
String password=request.getParameter("password");
String OK=request.getParameter("remname");
//2.跟数据库的惊醒比較推断
User user=service.isUser(username, password);
if(user==null){
//3.不匹配,就提醒
request.setAttribute("msg", "username或密码不对! ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}else{
//4.找到用户。重定向到index.jsp
request.getSession().setAttribute("user", user);
if("OK".equals(OK)){
//用户须要记住username
Cookie c=new Cookie("remname",URLEncoder.encode(user.getUsername(), "utf-8"));
c.setPath(request.getContextPath());
c.setMaxAge(3600*24*30);
response.addCookie(c);
}else{
//假设用户没有勾选记住username则删除记住username的cookie
Cookie c = new Cookie("remname","");
c.setPath(request.getContextPath());
c.setMaxAge(0);
response.addCookie(c); }
}
response.sendRedirect(request.getContextPath()+"/index.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
} }

Cookie是为了实现记住username的操作。

6.由于加入Cookie的时候有中文乱码的问题。因此须要url编码和解码的操作....自己定义标签完毕。

package cn.itheima.utils;

import java.io.IOException;
import java.net.URLDecoder;
import java.net.URLEncoder; import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport; public class SimpleURL extends SimpleTagSupport{
private String str;
private String encoding; public void setStr(String str) {
this.str = str;
} public void setEncoding(String encoding) {
this.encoding = encoding;
} @Override
public void doTag() throws JspException, IOException {
String decode = URLDecoder.decode(str, encoding == null ? "UTF-8" : encoding);
getJspContext().getOut().write(decode);
}
}

tld文件:

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd">
<tlib-version>1.0</tlib-version>
<short-name>s</short-name>
<uri>http://www.itheima.com/simple/mytag</uri>
<tag>
<name>decode</name>
<tag-class>cn.itheima.utils.SimpleURL</tag-class>
<body-content>empty</body-content>
<attribute>
<name>str</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<type>java.lang.String</type>
</attribute>
<attribute>
<name>encoding</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<type>java.lang.String</type>
</attribute>
</tag>
</taglib>

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