項目結構
代碼如下
登錄servlet
package com.ming.servlrt;
import com.ming.factory.DAOFactory;
import com.ming.vo.User;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String path = "login.jsp";
// 接收userid內容
String userid = req.getParameter("userid");
// 接收userpass內容
String userpadd = req.getParameter("userpass");
// 保存返回信息
List<string> info = new ArrayList<string>();
if(userid == null || "".equals(userid)){
info.add("用戶id不能為空");
}
if(userpadd == null || "".equals(userpadd)){
info.add("密碼不能為空");
}
// 報錯信息為0進行驗證
if(info.size() == 0){
User user = new User();
user.setUserid(userid);
user.setPassword(userpadd);
try{
if(DAOFactory.getIuserDAOInstance().findLogin(user)){
info.add("登錄成功!" + user.getName());
// 增加session會話
HttpSession session = req.getSession();
session.setAttribute("id", userid);
}else{
info.add("登錄失敗");
}
}catch (Exception e){
e.printStackTrace();
}
}
// 使用服務器端跳轉, 保存數據
req.setAttribute("info", info);
req.getRequestDispatcher(path).forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
/<string>/<string>
對於登錄的servlet增加了session
過濾器如下
package com.ming.filter;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;
// 首頁過濾器
public class LoginFile implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
// 轉型 因為默認的ServletRequest中未提供相關的方法,需要向下轉型
HttpServletRequest request = (HttpServletRequest)servletRequest;
// 獲取到session
HttpSession session = request.getSession();
// 判斷登錄
if(session.getAttribute("id") != null){
// 已經登錄
filterChain.doFilter(servletRequest, servletResponse);
}else{
// 跳轉登錄頁登錄
request.getRequestDispatcher("login.jsp").forward(servletRequest, servletResponse);
}
}
@Override
public void destroy() {
}
}
配置文件如下
br> "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application/<display-name>
<filter>
<filter-name>LoginFile/<filter-name>
<filter-class>com.ming.filter.LoginFile/<filter-class>
/<filter>
<filter-mapping>
<filter-name>LoginFile/<filter-name>
<url-pattern>/index.jsp/<url-pattern>
/<filter-mapping>
<servlet>
<servlet-name>login/<servlet-name>
<servlet-class>com.ming.servlrt.LoginServlet/<servlet-class>
/<servlet>
<servlet-mapping>
<servlet-name>login/<servlet-name>
<url-pattern>/loginServlet/<url-pattern>
/<servlet-mapping>
/<web-app>
jsp文件如下
涉及 前端的js驗證
採用攔截click事件
Created by IntelliJ IDEA.
User: ming
Date: 19-3-16
Time: 下午11:07
To change this template use File | Settings | File Templates.
--%>
<title>Title/<title>用戶登錄程序
List<string> info = (List<string>)request.getAttribute("info");
if(info != null){
Iterator<string> iterator = info.iterator();
while(iterator.hasNext()){
%>
}
}
%>
/<string>/<string>/<string>
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