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表单后台验证;
package cn.kgli.utils;
import java.util.Enumeration;import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.beanutils.BeanUtils;
public cla WebUtils {
//把request对象中的请求参数封装到bean中
public static T request2Bean(HttpServletRequest request,Cla clazz){
try{
T bean = clazz.newInstance();
//username=aa paword=bb email=aa@sina.com
Enumeration e = request.getParameterNames();
while(e.hasMoreElements()){
String name =(String)e.nextElement();//username=aaa paword=123
String value = request.getParameter(name);
BeanUtils.setProperty(bean, name, value);
}
return bean;
}catch(Exception e){
throw new RuntimeException(e);
}
}
public static String makeId(){
//UUID
36位字符
return UUID.randomUUID().toString();}
}
package cn.itcast.web.formbean;
import java.util.HashMap;import java.util.Map;
import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;
public cla RegisterFormBean {
private String username;private String paword;private String paword2;private String email;private String birthday;
private Map errors = new HashMap();
public Map getErrors(){
return errors;} public void setErrors(Map errors){
this.errors = errors;} public String getUsername(){
return username;} public void setUsername(String username){
this.username = username;} public String getPaword(){
return paword;} public void setPaword(String paword){
this.paword = paword;} public String getPaword2(){
return paword2;} public void setPaword2(String paword2){
this.paword2 = paword2;} public String getEmail(){
return email;} public void setEmail(String email){
this.email = email;
} public String getBirthday(){ return birthday;} public void setBirthday(String birthday){ this.birthday = birthday;} /* private String username;用户名不能为空，并且要是3-8的字符 abcdABcd private String paword;密码不能为空，并且要是3-8的数字 private String paword2;两次密码要一致
private String email;
可以为空，不为空要是一个合法的邮箱 private String birthday;可以为空，不为空时，要是一个合法的日期
*
*/ public boolean validate(){
boolean isOk = true;
if(this.username==null || this.username.trim().equals(“”)){
isOk = false;
errors.put(“username”, “用户名不能为空！”);}else{
if(!this.username.matches(“[a-zA-Z]{3,8}”)){
isOk = false;
errors.put(“username”, “用户名必须是3-8位的字母！”);
} }
if(this.paword==null || this.paword.trim().equals(“”)){
isOk = false;
errors.put(“paword”, “密码不能为空！”);}else{
if(!this.paword.matches(“d{3,8}”)){
isOk = false;
errors.put(“paword”, “密码必须是3-8位的数字！”);
} }
//private String paword2;两次密码要一致
if(this.paword2!=null){
if(!this.paword2.equals(this.paword)){
isOk = false;
errors.put(“paword2”, “两次密码不一致！”);
}
}
//private String email;
可以为空，不为空要是一个合法的邮箱
// flx_itcast@sina.com.cn
if(this.email!=null){
if(!this.email.matches(“w+@w+(.w+)+”)){
isOk = false;
errors.put(“email”, “邮箱不是一个合法邮箱！”);
}
}
//private String birthday;可以为空，不为空时，要是一个合法的日期
if(this.birthday!=null){
try{
DateLocaleConverter conver = new DateLocaleConverter();
conver.convert(this.birthday);
}catch(Exception e){
isOk = false;
errors.put(“birthday”, “生日必须要是一个日期！”);
}
}
return isOk;}
}
package cn.itcast.web.controller;
import java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.util.Date;
import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.beanutils.ConvertUtils;import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;
import cn.itcast.domain.User;import cn.itcast.exception.UserExistException;import cn.itcast.service.BusineService;import cn.itcast.service.impl.BusineServiceImpl;import cn.itcast.utils.WebUtils;import cn.itcast.web.formbean.RegisterFormBean;
public cla RegisterServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
RegisterFormBean formbean = WebUtils.request2Bean(request, RegisterFormBean.cla);
//表单校验
if(formbean.validate()==false){
request.setAttribute(“formbean”, formbean);
request.getRequestDispatcher(“/WEB-INF/jsp/register.jsp”).forward(request,response);
return;
}
//把表单的数据填充到javabean中
User user = new User();
try {
//注册字符串到日期的转换器
ConvertUtils.register(new DateLocaleConverter(), Date.cla);
BeanUtils.copyProperties(user, formbean);
user.setId(WebUtils.makeId());
BusineService service = new BusineServiceImpl();
service.registerUser(user);
request.setAttribute(“meage”, “注册成功！”);
request.getRequestDispatcher(“/meage.jsp”).forward(request, response);
}catch(UserExistException e){
formbean.getErrors().put(“username”, “注册用户已存在！”);
request.setAttribute(“formbean”, formbean);
request.getRequestDispatcher(“/WEB-INF/jsp/register.jsp”).forward(request, response);
} catch(Exception e){
e.printStackTrace();//在后台记录异常
request.setAttribute(“meage”, “对不起，注册失败！”);
request.getRequestDispatcher(“/meage.jsp”).forward(request, response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);}
}
过滤器解决中文乱码
package cn.itcast.web.filter;
import java.io.IOException;import java.io.UnsupportedEncodingException;
import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;
public cla CharacterEncodingFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)throws IOException, ServletException {
HttpServletRequest request =(HttpServletRequest)req;
HttpServletResponse response =(HttpServletResponse)resp;
request.setCharacterEncoding(“UTF-8”);
response.setCharacterEncoding(“UTF-8”);
response.setContentType(“text/html;charset=UTF-8”);
chain.doFilter(new MyRequest(request), response);
}
public void init(FilterConfig filterConfig)throws ServletException {
// TODO Auto-generated method stub
}
public void destroy(){
// TODO Auto-generated method stub
} }
cla MyRequest extends HttpServletRequestWrapper{ private HttpServletRequest request;public MyRequest(HttpServletRequest request){
super(request);
this.request = request;
} @Override public String getParameter(String name){
String value = this.request.getParameter(name);
if(value==null){
return null;
}
if(!this.request.getMethod().equalsIgnoreCase(“get”)){
return value;
}
try {
value = new String(value.getBytes(“iso8859-1”),“UTF-8”);
} catch(UnsupportedEncodingException e){
throw new RuntimeException(e);
}
return value;}
}
分页前端
<%@ page language=“java” import=“java.util.*” pageEncoding=“UTF-8”%> <%@taglib uri=“http://java.sun.com/jsp/jstl/core” prefix=“c”%>
显示所有书籍
图书信息
图书名称
作者
价格
图片
描述
操作
${book.name }
${book.author }
${book.price }
查看图片
${book.description }
修改
删除
当前第[${page.pagenum }]页
[${pagenum }]
总共[${page.totalpage }]页，总[${page.totalrecord }]纪录
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