用户登录与注册模块

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1、用户登录与注册模块（MVC）1.cn.itcast.dao包UserDao.java(Dao层的接口)packagecn.itcast.dao;importcn.itcast.domain.User;publicinterfaceUserDao{//添加用户到数据库中voidadd(Useruser);//根据用户名和密码查找数据库Userfind(Stringusername,Stringpassword);//查找注册的用户是否在数据库中存在Booleanfind(Stringusername);}2

2、.cn.itcast.dao.impl包UserDaoImpl.java（Dao接口实现）packagecn.itcast.dao.impl;importjava.text.SimpleDateFormat;importorg.dom4j.Document;importorg.dom4j.Element;importcn.itcast.dao.UserDao;importcn.itcast.domain.User;importcn.itcast.utils.XMLUtils;//操作数据库publiccl

3、assUserDaoImplimplementsUserDao{//添加用户到数据库中publicvoidadd(Useruser){try{Documentdocument=XMLUtils.getDocument();Elementroot=document.getRootElement();Elementuser_tag=root.addElement("user");user_tag.addAttribute("id",user.getId());user_tag.addAttribute("us

4、ername",user.getUsername());user_tag.addAttribute("password",user.getPassword());user_tag.addAttribute("eamil",user.getEmail());user_tag.addAttribute("birthday",user.getBirthday()==null?"":user.getBirthday().toLocaleString());user_tag.addAttribute("nickna

5、me",user.getNickname());XMLUtils.write2Xml(document);}catch(Exceptione){thrownewRuntimeException(e);}}//根据用户名和密码查找数据库publicUserfind(Stringusername,Stringpassword){try{Documentdocument=XMLUtils.getDocument();Elemente=(Element)document.selectSingleNode("//u

6、ser[@username='"+username+"'and@password='"+password+"']");if(e==null){returnnull;}Useruser=newUser();Stringdate=e.attributeValue("birthday");if(date==null

7、

8、date.equals("")){user.setBirthday(null);}else{SimpleDateFormatdf=newSimpleDateFormat("yyyy-MM-dd")

9、;user.setBirthday(df.parse(date));}user.setEmail(e.attributeValue("email"));user.setId(e.attributeValue("id"));user.setNickname(e.attributeValue("nickname"));user.setPassword(e.attributeValue("password"));user.setUsername(e.attributeValue("username"));ret

10、urnuser;}catch(Exceptione){thrownewRuntimeException(e);}}//查找注册的用户是否在数据库中存在publicBooleanfind(Stringusername){try{Documentdocument=XMLUtils.getDocument();Elemente=(Element)document.selectSingleNode("//user[@username=