多平台统一管理软件接口,如何实现多平台统一管理软件接口
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2023-07-03
java用户管理注册功能 含前后台代码
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"%>
用户注册:
姓名:
密码:
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
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println(" ");
out.println("");
out.println("
out.println("
out.println("
for(User u:users){
out.println("
out.println("
}
out.println("
out.println(" ");
out.println("");
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(" ");
out.println("");
out.println("
out.println("
if(boo){
out.println("恭喜您("+name+")注册成功了...");
}else{
out.println("您("+name+")注册失败了...
用户名已存在,请换一个注册");
}
out.println("返回");
out.println(" ");
out.println("");
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:
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://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">
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://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">
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);
http:// eUser.addElement("name").setText(user.getName());
eUser.addElement("pwd").setText(user.getPwd());
DomFactory.save();
return true;
}
@Override
public List
List
List
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:
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