本文实例为大家分享了java用户注册功能，供大家参考，具体内容如下
主页面:
浏览器显示：
代码实现：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>用户信息管理</title>
</head>
<body>
用户注册:<br/>
<!-- 相对路径 -->
<form action="reg" method="post">
姓名:<input type="text" name="name"/><br/>
密码:<input type="password" name="pwd"/><br/>
<input type="submit" value="注册"/>
</form>
<!-- 绝对路径 -->
<a href="/usersWeb/reg">查看所有用户</a><!-- GET方式:超链接和在url后面添加参数 -->
</body>
</html>
注册功能：
浏览器显示：
1)注册成功：
2)注册失败：
代码实现:
package cn.hncu.user.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.user.dao.UserDao;
import cn.hncu.user.dao.UserDaoImpl;
import cn.hncu.user.domain.User;
public class RegServlet extends HttpServlet {
//注入
UserDao dao=new UserDaoImpl();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<User> users=dao.queryAllUsers();
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>注册结果页面</TITLE></HEAD>");
out.println(" <BODY>");
out.println("<table cellspacing=0 border=1px><tr><th>操作</th><th>姓名</th></tr>");
for(User u:users){
out.println("<tr><td><a href='/usersWeb/del?id="+u.getId()+"'>删除</a></th>");
out.println("<th>"+u.getName()+"</th></tr>");
}
out.println("</table>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
String pwd=request.getParameter("pwd");
User user=new User();
user.setName(name);
user.setPwd(pwd);
boolean boo=dao.reg(user);
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>注册结果页面</TITLE></HEAD>");
out.println(" <BODY>");
if(boo){
out.println("恭喜您("+name+")注册成功了...");
}else{
out.println("您("+name+")注册失败了...<br/>用户名已存在,请换一个注册");
}
out.println("<a href='javascript:history.go(-1)'>返回</a>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
查看所有用户功能:
浏览器显示：
代码实现： RegServlet类的doGet方法实现
删除操作功能：删除成功会重定向到主页面
代码实现：
package cn.hncu.user.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.user.dao.UserDao;
import cn.hncu.user.dao.UserDaoImpl;
public class DelServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String id=request.getParameter("id");
// System.out.println("del-id:"+id);
UserDao dao=new UserDaoImpl();
dao.delUser(id);
//转到主页--重定向
response.sendRedirect("/usersWeb/index.jsp");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
配置文件：
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <servlet> <servlet-name>RegServlet</servlet-name> <servlet-class>cn.hncu.user.servlet.RegServlet</servlet-class> </servlet> <servlet> <servlet-name>DelServlet</servlet-name> <servlet-class>cn.hncu.user.servlet.DelServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RegServlet</servlet-name> <url-pattern>/reg</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DelServlet</servlet-name> <url-pattern>/del</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
domain包的User对象
package cn.hncu.user.domain;
public class User {
private String id;
private String name;
private String pwd;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
User other = (User) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", pwd=" + pwd + "]";
}
}
逻辑层dao：
接口
实现类
package cn.hncu.user.dao;
import java.util.ArrayList;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import cn.hncu.user.domain.User;
import cn.hncu.user.utils.DomFactory;
import cn.hncu.user.utils.IDGenerate;
public class UserDaoImpl implements UserDao{
Document dom=DomFactory.getDom();
@Override
public boolean reg(User user) {
// //title[@lang='eng']选取所有 title 元素，且这些元素拥有值为 eng 的 lang 属性。
// dom.selectSingleNode("//user[fn:lower-case(@name)='"+user.getName().toLowerCase()+"']");
Node node=dom.selectSingleNode("//user[name='"+user.getName()+"']");//user节点下值为user.getName()的name元素
//"name[='"+user.getName().toLowerCase()+"']"
if(node!=null){
return false;
}
Element root=dom.getRootElement();
Element eUser=root.addElement("user");
String id=IDGenerate.getID();
eUser.addAttribute("id", id);
eUser.addElement("name").setText(user.getName());
eUser.addElement("pwd").setText(user.getPwd());
DomFactory.save();
return true;
}
@Override
public List<User> queryAllUsers() {
List<User> users=new ArrayList<User>();
List<Element> en=dom.selectNodes("//user");
for(Element e:en){
String id=e.attributeValue("id");
String name=e.elementText("name");
User user=new User();
user.setId(id);
user.setName(name);
users.add(user);
}
return users;
}
@Override
public void delUser(String id) {
// System.out.println(id);
String xpath="//user[@id='"+id+"']";
Node node=dom.selectSingleNode(xpath);
if(node!=null){
// System.out.println("del...");
node.getParent().remove(node);
DomFactory.save();
}
}
}
工具包utils：
获取用户id
package cn.hncu.user.utils;
import java.util.UUID;
public class IDGenerate {
private IDGenerate(){
}
public static String getID(){
// return UUID.randomUUID().toString();
return UUID.randomUUID().toString().replace("-", "");
}
}
对数据库users.xml的dom获取和保存方法
这里用dom4j的包，，，所以要把dom4j两个包导入的相应的位置：
package cn.hncu.user.utils;
import java.io.FileOutputStream;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class DomFactory {
private static Document dom;
private static String fileName;
static{
try {
SAXReader r=new SAXReader();
fileName=DomFactory.class.getClassLoader().getResource("users.xml").getPath();
System.out.println("users.xml的路径:"+fileName);///D:/apache-tomcat-7.0.30/webapps/usersWeb/WEB-INF/classes/users.xml
//注意:获取tomcat中当前项目classpath下的资源方式
dom=r.read(fileName);
} catch (DocumentException e) {
e.printStackTrace();
}
}
public static Document getDom(){
return dom;
}
public static void save(){
XMLWriter w;
try {
w = new XMLWriter(new FileOutputStream(fileName));
w.write(dom);
w.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
数据库：
<?xml version="1.0" encoding="UTF-8"?> <users> </users>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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时间： 2024-10-04 21:57:12