第一个JavaWeb项目
document.getElementById().value
这个卡了很久，一直报错null，最后问学长发现是input的id忘了设置…
运行截图：
以下是源代码部分：
网页部分：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>学生信息添加页面</title> <link href="Resource/image/logo.ico" rel="icon" sizes="32x32"> </head> <style> input[type=submit]{ padding:5px 100px; border-style:none; background-color:#e0e0e0; font-family:Sans-serif; } #top_header{ font-family:Sans-serif; padding:5px; margin:0px; background-color:#e0e0e0; text-algin:center; } #lInfo{ width:11em; padding:10px 10px; border:0px; margin:0px 0px 0px 0px; position:relative; float:left; } #rInfo{ width:10em; padding:10px 10px; margin:0px; position:relative; float:left; } textarea{ height:100px; width:300px; } input[type=text]{ width:300px; } </style> <body> <div id="top_header"><div align=left>当前位置:添加学生信息</div></div> <div><div id="lInfo"><div align=right><p>登陆账号:</p><p>登陆密码:</p><p>性别:</p><p>姓名:</p><p>学号:</p><p>电子邮件:</p> <p>所在学院:</p><p>所在系:</p><p>所在班级:</p><p>入学年份(届):</p><p>生源地:</p><p>备注:</p></div></div><div id="rInfo"><div align=left> <form action=Register method=post> <p><input name="stuUserName" id="SUNI" type=text placeholder="请输入登陆账号"></p> <p><input name="stuPwd" id="SPWI" type=password style="width:300px;" placeholder="请输入登陆密码"></p> <p><input name="stuSex" id="SSEI" type=radio value="男">男 <input name="stuSex" type=radio value="女">女</p> <p><input name="stuName" id="SNAI" type=text placeholder="请输入姓名"></p> <p><input name="stuNum" id="SNUI" type=text placeholder="请输入学号"></p> <p><input name="stuMail" id="SMAI" type=text placeholder="请输入电子邮件"></p> <p><input name="stuInst" id="SINI" type=text placeholder="请输入所在学院"></p> <p><input name="stuSub" id="SSUI" type=text placeholder="请输入所在系"></p> <p><input name="stuClass" id="SCLI" type=text placeholder="请输入所在班级"></p> <p><select name="stuYear"> <option value="1998">1998</option> <option value="1999">1999</option> <option value="2000">2000</option> <option value="2001">2001</option> <option value="2002">2002</option> <option value="2003">2003</option> <option value="2004">2004</option> <option value="2005">2005</option> <option value="2006">2006</option> <option value="2007">2007</option> <option value="2008">2008</option> <option value="2009">2009</option> <option value="2010">2010</option> <option value="2011">2011</option> <option value="2012">2012</option> <option value="2013">2013</option> <option value="2014">2014</option> <option value="2015">2015</option> <option value="2016">2016</option> <option value="2017">2017</option> <option value="2018">2018</option> <option value="2019">2019</option> </select>届</p> <p><input name="stuLocal" id="SLOI" type=text placeholder="请输入生源地"></p> <p><textarea name="stuMemo" placeholder="无" ></textarea></p> <p><input type=submit value="提交" onclick="return InfoChk();"></p> <script type = "text/javascript"> function InfoChk(){ var SMAChk = /^([a-z0-9A-Z]+[-|\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\.)+[a-zA-Z]{2,}$/; var SUNChk = /^[A-Za-z][A-Za-z0-9]{5,11}$/; var SPWChk = /^[A-Za-z0-9]{8,}$/; var SNUChk = /^2018[0-9]{4}$/; var SUN = document.getElementById("SUNI").value; var SPW = document.getElementById("SPWI").value; var SSE = document.getElementById("SSEI").value; var SNA = document.getElementById("SNAI").value; var SNU = document.getElementById("SNUI").value; var SMA = document.getElementById("SMAI").value; var SIN = document.getElementById("SINI").value; var SSU = document.getElementById("SSUI").value; var SCL = document.getElementById("SCLI").value; var SLO = document.getElementById("SLOI").value; if (SUN==""){ alert("您的登陆账号未填写!"); return false; }else if(SPW==""){ alert("您的登陆密码未填写!"); return false; }else if(SSE==""){ alert("您的性别未选择!"); return false; }else if(SNA==""){ alert("您的姓名未填写!"); return false; }else if(SNU==""){ alert("您的学号未填写!"); return false; }else if(SMA==""){ alert("您的电子邮件未填写!"); return false; }else if(SIN==""){ alert("您的所在学院未填写!"); return false; }else if(SSU==""){ alert("您的所在系未填写!"); return false; }else if(SCL==""){ alert("您的所在班级未填写!"); return false; }else if(SLO==""){ alert("您的生源地未填写!"); return false; }else{ if(!SUNChk.exec(SUN)){ alert("您的登陆账号格式有误!"); return false; }else if(!SPWChk.exec(SPW)){ alert("您的登陆密码格式有误!"); return false; }else if(!SMAChk.exec(SMA)){ alert("您的电子邮件格式有误!"); return false; }else if(!SNUChk.exec(SNU)){ alert("您的学号格式有误!"); return false; } } } </script> </form> </div> </div> </div> </body> </html>
servlet:
package servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import dao.ConfirmSUN; import dao.RegisterAdd; import dataCla.DatChk; import dataCla.StuInfo; import dataCla.calMD5; /** * Servlet implementation class Register */ @WebServlet("/Register") public class Register extends HttpServlet { private static final long serialVersionUID = 1L; protected void service(HttpServletRequest request00, HttpServletResponse response00) throws ServletException, IOException { boolean flag = false; request00.setCharacterEncoding("utf-8"); response00.setContentType("text/html;charset=UTF-8"); if (request00.getParameter("stuUserName").equals("") || request00.getParameter("stuPwd").equals("") || request00.getParameter("stuSex").equals("") || request00.getParameter("stuName").equals("") || request00.getParameter("stuNum").equals("") || request00.getParameter("stuMail").equals("") || request00.getParameter("stuInst").equals("") || request00.getParameter("stuSub").equals("") || request00.getParameter("stuClass").equals("") || request00.getParameter("stuYear").equals("") || request00.getParameter("stuLocal").equals("")) { response00.getWriter().print("<script language='javascript'>alert('添加失败!有项目未填写')</script>"); } else { if (!DatChk.SUNChk(request00.getParameter("stuUserName")) || !DatChk.SPWChk(request00.getParameter("stuPwd")) || !DatChk.SNUChk(request00.getParameter("stuNum")) || (request00.getParameter("stuUserName").length() < 6) || (request00.getParameter("stuUserName").length() > 12) || (request00.getParameter("stuPwd").length() < 8) || (request00.getParameter("stuNum").length() != 8)) { response00.getWriter().print("<script language='javascript'>alert('添加失败!信息不符合要求')</script>"); } else { if (ConfirmSUN.ConfSUN(request00.getParameter("stuUserName"))) { response00.getWriter().print("<script language='javascript'>alert('添加失败!登陆账号被使用')</script>"); } else { StuInfo log; try { log = new StuInfo(request00.getParameter("stuUserName"), calMD5.getMD5Str(request00.getParameter("stuPwd")), request00.getParameter("stuSex"), request00.getParameter("stuName"), request00.getParameter("stuNum"), request00.getParameter("stuMail"), request00.getParameter("stuInst"), request00.getParameter("stuSub"), request00.getParameter("stuClass"), request00.getParameter("stuYear"), request00.getParameter("stuLocal"), request00.getParameter("stuMemo")); flag = RegisterAdd.add(log); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } if (flag == false) { response00.getWriter() .print("<script language='javascript'>alert('添加失败!数据库连接错误或您的信息过长')</script>"); } else { response00.getWriter().print("<script language='javascript'>alert('添加完成!')</script>"); } } } } response00.setHeader("refresh", "1;URL=StudentRegisterPage.jsp"); } }
dao:
package dao; import java.sql.Connection; import java.sql.Statement; import DBUL.DBUtil; import dataCla.StuInfo; public class RegisterAdd { public static boolean add(StuInfo ipt) { String sql = "insert into stu_base_log_00(stuUserName,stuPWD,stuSex,stuName,stuNum,stuMail,stuInst,stuSub,stuClass,stuYear,stuLocal,stuMemo) values('" + ipt.getSUN() + "','" + ipt.getSPW() + "','" + ipt.getSSE() + "','" + ipt.getSNA() + "','" + ipt.getSNU() + "','" + ipt.getSMA() + "','" + ipt.getSIN() + "','" + ipt.getSSU() + "','" + ipt.getSCL() + "','" + ipt.getSYE() + "','" + ipt.getSLO() + "','" + ipt.getSME() + "')"; Connection conn = DBUtil.getConn(); Statement state = null; boolean f = false; int a = 0; try { state = conn.createStatement(); a = state.executeUpdate(sql); } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } }
package dao; //查询，用来检查用户名是否重复 import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement; import DBUL.DBUtil; public class ConfirmSUN { public static boolean ConfSUN(String iptSUN) { boolean flag = false; String sql = "select userUName from user_base_log where userUName ='" + iptSUN + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); if (rs.next()) { flag = true; } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return flag; } }
dataCla(保存数据的类,以及网上提供的MD5算法和后台的第二次校验输入是否有效的方法类):
package dataCla; public class StuInfo { private String stuUserName = new String(""); private String stuPwd = new String(""); private String stuSex = new String(""); private String stuName = new String(""); private String stuNum = new String(""); private String stuMail = new String(""); private String stuInst = new String(""); private String stuSub = new String(""); private String stuClass = new String(""); private String stuYear = new String(""); private String stuLocal = new String(""); private String stuMemo = new String(""); public StuInfo(String SUN, String SPW, String SSE, String SNA, String SNU, String SMA, String SIN, String SSU, String SCL, String SYE, String SLO, String SME) { stuUserName = SUN; stuPwd = SPW; stuSex = SSE; stuName = SNA; stuNum = SNU; stuMail = SMA; stuInst = SIN; stuSub = SSU; stuClass = SCL; stuYear = SYE; stuLocal = SLO; stuMemo = SME; } public String getSUN() { return stuUserName; } public String getSPW() { return stuPwd; } public String getSSE() { return stuSex; } public String getSNA() { return stuName; } public String getSNU() { return stuNum; } public String getSMA() { return stuMail; } public String getSIN() { return stuInst; } public String getSSU() { return stuSub; } public String getSCL() { return stuClass; } public String getSYE() { return stuYear; } public String getSLO() { return stuLocal; } public String getSME() { return stuMemo; } }
package dataCla; import java.util.regex.Matcher; import java.util.regex.Pattern; public class DatChk { public static boolean SUNChk(String ipt) { boolean tag = true; final String pattern1 = "^[A-Za-z]\\w+$"; final Pattern pattern = Pattern.compile(pattern1); final Matcher mat = pattern.matcher(ipt); if (!mat.find()) { tag = false; } return tag; } public static boolean emailFormat(String email) { boolean tag = true; final String pattern1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$"; final Pattern pattern = Pattern.compile(pattern1); final Matcher mat = pattern.matcher(email); if (!mat.find()) { tag = false; } return tag; } public static boolean SPWChk(String ipt) { boolean tag = true; final String pattern1 = "^[A-Za-z0-9]+$"; final Pattern pattern = Pattern.compile(pattern1); final Matcher mat = pattern.matcher(ipt); if (!mat.find()) { tag = false; } return tag; } public static boolean SNUChk(String ipt) { boolean tag = true; final String pattern1 = "^2018[0-9]+$"; final Pattern pattern = Pattern.compile(pattern1); final Matcher mat = pattern.matcher(ipt); if (!mat.find()) { tag = false; } return tag; } }
