用户注册信息的验证与数据回显

来源：互联网发布：赈灾晚会的数据统计编辑：程序博客网时间：2024/04/30 13:15

半成品带完善

用户注册信息的验证与数据回显
注：需要数据库驱动jar包，BeanUtils.jar,jstl.jar,stand.jar
熟悉各种表单类型数据的回显与验证
会写FormBeanUtil工具类
会在一个web.controller类中处理各种业务
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注册表单
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.itcast.cn/myfn" prefix="myfn"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>用户注册</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>

<body>

<form action="${pageContext.request.contextPath}/servlet/ControllerServlet?operation=regist" method="post">
<table border="1" width="50%">
<tr>
<td><span style="color: red;">*</span>用户名(3~8位字母)</td>
<td>

<input type="text" name="username" value="${formBean.username}" />${formBean.errors.username}
</td>
</tr>
<tr>
<td><span style="color: red;">*</span>密码(3~8位数字)</td>
<td>
<input type="password" name="password" value="${formBean.password}" />${formBean.errors.password}
</td>
</tr>
<tr>
<td><span style="color: red;">*</span>确认密码</td>
<td>
<input type="password" name="repassword" value="${formBean.repassword}" />${formBean.errors.repassword}
</td>
</tr>
<tr>
<td>性别</td>
<td>
<input type="radio" name="gender" value="1" ${formBean.gender=="1"?"checked='checked'":""} />男
<input type="radio" name="gender" value="0" ${formBean.gender=="0"?"checked='checked'":""}/>女
</td>
</tr>
<tr>
<td><span style="color: red;">*</span>邮箱</td>
<td>
<input type="text" name="email" value="${formBean.email}" />${formBean.errors.email}
</td>
</tr>
<tr>

<td><span style="color: red;">*</span>出生日期</td>
<td>
<input type="text" name="birthday" value="${formBean.birthday}" />${formBean.errors.birthday}
</td>
</tr>
<tr>
<td>爱好</td>
<td>
<input type="checkbox" name="hobbies" value="吃饭" ${myfn:contains(formBean.hobbies,'吃饭')?"checked='checked'":""}/>吃饭
<input type="checkbox" name="hobbies" value="睡觉" ${myfn:contains(formBean.hobbies,'睡觉')?"checked='checked'":""}/>睡觉
<input type="checkbox" name="hobbies" value="打豆豆" ${myfn:contains(formBean.hobbies,'打豆豆')?"checked='checked'":""}/>打豆豆
</td>
</tr>
<tr>
<td>描述</td>
<td>
<textarea name="description" rows="6" cols="48" >${formBean.description}</textarea>
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="注册" />
</td>
</tr>
</table>
</form>

</body>
</html>

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针对hobbies中的数据回显自定义的EL函数
// 1 创建函数
public class MyFunctions {
public static boolean contains(String[] strs,String str){
boolean result = false;
if(strs!=null&&strs.length>0){
for(String s: strs){
if(s.equals(str)){
result = true;
break;
}
}
}
return result;
}
}

// 2 在WEB-INF下建立myfn.tld的xml文件更改配置信息
<?xml version="1.0" encoding="UTF-8"?>
<taglib 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"
version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>myfn</short-name>
<uri>http://www.itcast.cn/myfn</uri>
<function>
<name>contains</name>
<function-class>cn.itcast.el.functions.MyFunctions</function-class>
<function-signature>boolean contains( java.lang.String[],java.lang.String )</function-signature>
</function>
</taglib>
// 3 在jsp页面中导入配置文件myfn.tld
<%@ taglib uri="http://www.itcast.cn/myfn" prefix="myfn"%>

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formBean: 与表单对应，所有字段都是String类型的,封装了表单提交的信息
public class UserFormBean {

private String username;
private String password;
private String repassword;
private String gender;
private String email;
private String birthday;
private String[] hobbies;
private String description;
// 存放错误信息： key: 字段名 value:错误消息
private Map<String, String> errors = new HashMap<String, String>();

// 一系列的setter和getter属性(注：不需要errors的setter属性)

// 验证字段
public boolean validate(){
// 正则： java.util.regex.Pattern查

// 验证用户名: 3~8位字母
if(username==null || username.trim().equals("")){
errors.put("username", "用户名不能为空");
}else{
if(!username.matches("[a-zA-Z]{3,8}")){
errors.put("username", "用户名必须是3~8位的字母");
}
}

// 验证密码： 3~8位数字
if(password==null || password.trim().equals("")){
errors.put("password", "密码不能为空");
}else{
if(!password.matches("\\d{3,8}")){
errors.put("password", "密码必须是3~8位的数字");
}
}

// 重复密码
if(repassword!=null){
if(!repassword.equals(password)){
errors.put("repassword", "两次密码必须一致");
}
}else{
errors.put("repassword", "请输入重复密码");
}

// 邮箱
if(email==null || email.trim().equals("")){
errors.put("email", "邮箱不能为空");
}else{
if(!email.matches("\\w+@\\w+(\\.\\w+)+")){
errors.put("email", "请输入正确的邮箱");
}
}

// 生日
if(birthday==null || birthday.trim().equals("")){
errors.put("birthday", "出生日期不能为空");
}else{
DateLocaleConverter dlc = new DateLocaleConverter();
try{
dlc.convert(birthday);
}catch(Exception e){
errors.put("birthday", "请输入正确的日期");
}
}

// 若errors集合为空，即没有错误，返回true
return errors.isEmpty();
}

}
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FormBeanUtil工具类：将form发送的请求的信息封装到类中
public class WebUtil {
public static <T>T fillData(HttpServletRequest request, Class<T> clazz){
try{
T bean = clazz.newInstance();
BeanUtils.populate(bean, request.getParameterMap());
return bean;
}catch (Exception e){
throw new RuntimeException(e);
}
}
}
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Servlet控制层
public class ControllerServlet extends HttpServlet {

private BusinessService s = new BusinessServiceImpl();

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String encoding = "UTF-8";
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
response.setContentType("text/html;charset="+encoding);

String operation = request.getParameter("operation");
if("regist".equals(operation)){
regist(request,response);
}
}

// 完成注册
private void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 验证--填充模型：把用户的数据填充到模型层javaBean中
UserFormBean formBean = null;
try{
// 把数据(字段和错误信息error)封装到一个FormBean(与form表单对应)中，利用FormBean进行验证
formBean = FormBeanUtil.fillData(request,UserFormBean.class);
// 验证不通过：数据回显
if(!formBean.validate()){
request.setAttribute("formBean", formBean);
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}else{
// 验证通过：填充模型FormBean ---> user 类型转换：String-->Other Other-->String
User user = new User();
ConvertUtils.register(new DateLocaleConverter(), Date.class);
// 参数：目标源
BeanUtils.copyProperties(user, formBean);

// 对爱好进行单独处理
String[] hobbies = formBean.getHobbies();
if(hobbies!=null&&hobbies.length>0){
StringBuffer sb = new StringBuffer();
for(int i=0;i<hobbies.length;i++){
if(i>0){
sb.append(",");
}
sb.append(hobbies[i]);
}
c.setHobby(sb.toString());
}

// 把信息存到数据库中(用户名可能存在)
s.register(user);
request.setAttribute("message", "注册成功");
request.getRequestDispatcher("/message.jsp").forward(request, response);
}
}catch(UserExistException e){
formBean.getErrors().put("username", "用户名已存在"); // 给errors错误集合新增元素
// 数据回显
request.setAttribute("formBean", formBean);
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}catch(Exception e){
e.printStackTrace(); // 后台日志记录异常
request.setAttribute("message", "服务器忙");
request.getRequestDispatcher("/message.jsp").forward(request, response);
}
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>全局消息页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
${message}
</body>
</html>

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