JSP的内置对象 servlet实战 不行就评论要源码

`BaseServlet package servlet;

import java.io.IOException;

import java.lang.reflect.Method;

import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;

public class BaseServlet extends HttpServlet{

@Override

protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //接收参数 req.setCharacterEncoding(“UTF-8”); resp.setContentType(“text/html;charset=UTF-8”); String methodName=req.getParameter(“method”); if(methodName==null || “”.equals(methodName)){ resp.getWriter().print(“method的参数为null”); } //获得子类的class对象 Class clazz=this.getClass(); //获得子类中的方法 try { Method method=clazz.getMethod(methodName,HttpServletRequest.class,HttpServletResponse.class); //使方法执行 String path=(String) method.invoke(this,req,resp); if(path!=null){ //跳转页面 req.getRequestDispatcher(path).forward(req, resp); } } catch ( Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

CheckImgServlet(验证码Servlet):

package servlet;

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;

/**

生成验证码图片

*/ public class CheckImgServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 禁止缓存 // response.setHeader("Cache-Control", "no-cache"); // response.setHeader("Pragma", "no-cache"); // response.setDateHeader("Expires", -1); int width = 120; int height = 30; // 步骤一 绘制一张内存中图片 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 步骤二 图片绘制背景颜色 ---通过绘图对象 Graphics graphics = bufferedImage.getGraphics();// 得到画图对象 --- 画笔 // 绘制任何图形之前 都必须指定一个颜色 graphics.setColor(getRandColor(200, 250)); graphics.fillRect(0, 0, width, height); // 步骤三 绘制边框 graphics.setColor(Color.WHITE); graphics.drawRect(0, 0, width - 1, height - 1); // 步骤四 四个随机数字 Graphics2D graphics2d = (Graphics2D) graphics; // 设置输出字体 graphics2d.setFont(new Font("宋体", Font.BOLD, 18)); String words = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890"; // String words = "\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"; Random random = new Random();// 生成随机数 // 强随机生成的验证码保存到session: StringBuffer buffer = new StringBuffer(); // 定义x坐标 int x = 10; for (int i = 0; i < 4; i++) { // 随机颜色 graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random .nextInt(110), 20 + random.nextInt(110))); // 旋转 -30 --- 30度 int jiaodu = random.nextInt(60) - 30; // 换算弧度 double theta = jiaodu * Math.PI / 180; // 生成一个随机数字 int index = random.nextInt(words.length()); // 生成随机数 0 到 length - 1 // 获得字母数字 char c = words.charAt(index); // 将生成汉字 加入buffer buffer.append(c); // 将c 输出到图片 graphics2d.rotate(theta, x, 20); graphics2d.drawString(String.valueOf(c), x, 20); graphics2d.rotate(-theta, x, 20); x += 30; } //将验证码放到session里 request.getSession().setAttribute("code", buffer.toString()); // 步骤五 绘制干扰线 graphics.setColor(getRandColor(160, 200)); int x1; int x2; int y1; int y2; for (int i = 0; i < 30; i++) { x1 = random.nextInt(width); x2 = random.nextInt(12); y1 = random.nextInt(height); y2 = random.nextInt(12); graphics.drawLine(x1, y1, x1 + x2, x2 + y2); } // 将上面图片输出到浏览器 ImageIO graphics.dispose();// 释放资源 ImageIO.write(bufferedImage, "jpg", response.getOutputStream()); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } /** * 取其某一范围的color * * @param fc * int 范围参数1 * @param bc * int 范围参数2 * @return Color */ private Color getRandColor(int fc, int bc) { // 取其随机颜色 Random random = new Random(); if (fc > 255) { fc = 255; } if (bc > 255) { bc = 255; } int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); }

}

MydateConverter(日历): package servlet;

import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date;

import org.apache.commons.beanutils.Converter;

/**

自定义 java.util.Date日期转换器

*/ public class MyDateConverter implements Converter {

// 将value 转换 c 对应类型 // 存在Class参数目的编写通用转换器，如果转换目标类型是确定的，可以不使用c 参数 @Override public Object convert(Class c, Object value) { String strVal = (String) value; // 将String转换为Date --- 需要使用日期格式化 DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); try { Date date = dateFormat.parse(strVal); return date; } catch (ParseException e) { e.printStackTrace(); } return null; }

}

UserServlet: package servlet;

import java.io.IOException; import java.sql.Date; import java.util.Map;

import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.ConvertUtils;

import domain.User; import service.UserService; import service.UserServiceImpl;

/**

Servlet implementation class UserServlet */ public class UserServlet extends BaseServlet { private static final long serialVersionUID = 1L; public String registUI(HttpServletRequest req, HttpServletResponse resp){ return “/jsp/regist.jsp”; } public String loginUI(HttpServletRequest req, HttpServletResponse resp){ return “/jsp/login.jsp”; } public String history(HttpServletRequest req, HttpServletResponse resp){ return “/jsp/history.jsp”; }

/* public String checkUsername(HttpServletRequest req, HttpServletResponse resp){ try { //接收参数 String username=req.getParameter(“username”); //校验用户名 调用service UserService userService =new UserServiceImpl(); User user=userService.findUsername(username); if(user==null){ //用户名可以使用 resp.getWriter().println(“1”); }else{ //用户名不可以使用 resp.getWriter().println(“0”); }

} catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null;

} */ public String regist(HttpServletRequest req, HttpServletResponse resp){

try { //接收数据 Map<String,String[]> map=req.getParameterMap(); //封装数据 User user =new User(); ConvertUtils.register(new MyDateConverter(), Date.class); BeanUtils.populate(user, map);

//创建session对象 req.getSession().setAttribute(“user”, user); resp.sendRedirect(req.getContextPath()+"/jsp/registsuccess.jsp");

} catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null;

} public String login(HttpServletRequest req, HttpServletResponse resp){ //判断验证码 String code1=req.getParameter(“code”); String code2=(String) req.getSession().getAttribute(“code”); req.getSession().removeAttribute(“code”); if(!code1.equalsIgnoreCase(code2)){ req.setAttribute(“msg”, “验证码错误！”); return “/jsp/login.jsp”; }

try { //接收数据 String username=req.getParameter("username"); String password=req.getParameter("password"); //将参数封装到User类中 User user=new User(); user.setUsername(username); user.setPassword(password);

//调用业务层,传入user UserService userService =new UserServiceImpl(); User exitsUser=userService.login(user); resp.setContentType(“text/html;charset=GBK”); if(exitsUser==null){ req.setAttribute(“msg”,“

用户名或密码错误 ”); return “/jsp/login.jsp”; }else{ //登录成功 记住用户名 String remember=req.getParameter(“remember”); if(“true”.equals(remember)){ Cookie cookie=new Cookie(“username”, exitsUser.getUsername()); cookie.setPath("/shiyan"); cookie.setMaxAge(246060); resp.addCookie(cookie);

} req.getSession().setAttribute("exitsUser", exitsUser); resp.sendRedirect(req.getContextPath()+"/jsp/success.jsp"); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null;

}

//用户退出 public String logOut(HttpServletRequest req, HttpServletResponse resp){ req.getSession().invalidate(); try { resp.sendRedirect(req.getContextPath()+"/index.jsp"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }

} login.jsp: <%@ page language=“java” contentType=“text/html; charset=UTF-8” pageEncoding=“UTF-8”%> <!doctype html>

会员登录

}

<div class="col-md-5"> <div style="width:440px;border:1px solid #E7E7E7;padding:20px 0 20px 30px;border-radius:5px;margin-top:60px;background:#fff;"> <font>会员登录</font>USER LOGIN <div>&nbsp;</div> ${msg} 验证码 自动登录       记住用户名

regist.jsp: <%@ page language=“java” contentType=“text/html; charset=UTF-8” pageEncoding=“UTF-8”%> <!doctype html>

会员登录 <div class="col-md-2"></div> <div class="col-md-8" style="background:#fff;padding:40px 80px;margin:30px;border:7px solid #ccc;"> <font>会员注册</font>USER REGISTER <div>&nbsp;</div> ${ msg } <form class="form-horizontal" style="margin-top:5px;"action="${pageContext.request.contextPath}/UserServlet" method="post"> <input type="hidden" name="method" value="regist" > <div class="form-group"> <label for="username" class="col-sm-2 control-label ">用户名</label> <div class="col-sm-6"> <input type="text" class="form-control " id="username" name="username" placeholder="请输入用户名"> </div> <div id="s7" class=" required"></div> </div> <div class="form-group"> <label for="inputPassword3" class="col-sm-2 control-label">密码</label> <div class="col-sm-6"> <input type="password" class="form-control " id="password" name="password" placeholder="请输入密码"> </div> <div id="s1" class=" required"></div> </div> <div class="form-group"> <label for="confirmpwd" class="col-sm-2 control-label">确认密码</label> <div class="col-sm-6"> <input type="password" class="form-control " id="repassword" name="repassword" placeholder="请输入确认密码"> </div> <div id="s2" class=" required"></div> </div> <div class="form-group"> <label for="inputEmail3" class="col-sm-2 control-label ">Email</label> <div class="col-sm-6"> <input type="email" class="form-control " id="email" name="email"placeholder="Email"> </div> <div id="s4" class=" required"></div> </div> <div class="form-group"> <label for="usercaption" class="col-sm-2 control-label">姓名</label> <div class="col-sm-6"> <input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名"> </div> <div id="s3" class=" required"></div> </div> <div class="form-group"> <label for="usercaption" class="col-sm-2 control-label">电话</label> <div class="col-sm-6"> <input type="text" class="form-control" id="phone" name="telephone" placeholder="请输入电话"> </div> <div id="s8" class=" required"></div> </div> <div class="form-group opt"> <label for="inlineRadio1" class="col-sm-2 control-label">性别</label> <div class="col-sm-6"> <label class="radio-inline"> <input type="radio" name="sex" id="inlineRadio1" value="男" checked> 男 </label> <label class="radio-inline"> <input type="radio" name="sex" id="inlineRadio2" value="女"> 女 </label> </div> </div> <div class="form-group"> <label for="text" class="col-sm-2 control-label">出生日期</label> <div class="col-sm-6"> <input type="date" class="form-control " id="date" name="date"> </div> <div id="s5" class=" required"></div> </div> <div class="form-group"> <label for="date" class="col-sm-2 control-label">验证码</label> <div class="col-sm-3"> <input type="text" class="form-control" id="code" name="code" > </div> <div class="col-sm-2"> <img id="img1" src="/store/CheckImgServlet" onclick="changeImg();"/> </div> <div id="s6" class=" required"></div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <input type="submit" width="100" value="注册" name="submit" border="0" style="background: url('${pageContext.request.contextPath}/images/register.gif') no-repeat scroll 0 0 rgba(0, 0, 0, 0); height:35px;width:100px;color:white;"> </div> </div> </form> </div> <div class="col-md-2"></div> `