还是有关session的登录验证小应用
一个jsp登录页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.mison.User"%>
<html>
<head>
<title>My JSP 'sessionLogin.jsp' starting page</title>
</head>
<body>
<%
User user=null;
String name="";
String authority="";
if(!session.isNew()){
user =(User)session.getAttribute("user");
name=user.getName();
authority=user.getAuthority();
}
%>
<form action="LoginCheck">
username1:<input type="text" name="username" value="<%=name%>"><br>
password:<input type="password" name="password" value=""><br>
authority:
<select name="authority">
<option value="boss" <%="boss".equals(authority)?"selected='selected'":""%>>boss</option>
<option value="user" <%="user".equals(authority)?"selected='selected'":"" %>>user</option>
</select><br>
<input type="submit" value="submit">
</form>
</body>
</html>
web.xml页面
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>LoginCheck</servlet-name>
<servlet-class>com.mison.LoginCheck</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginCheck</servlet-name>
<url-pattern>/LoginCheck</url-pattern>
</servlet-mapping>
一个进行验证的servlet类
package com.mison;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginCheck extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
User user=new User();
HttpSession session =req.getSession();
String username=req.getParameter("username");
String password=req.getParameter("password");
String authority=req.getParameter("authority");
if("boss".equals(authority)){
if("chenjing".equals(username)&&"chenjing".equals(password)){
user.setName(username);
user.setPassword(password);
user.setAuthority(authority);
session.setAttribute("user", user);
RequestDispatcher dp=req.getRequestDispatcher("success.jsp");
dp.forward(req, resp);
}
else{
user.setName(username);
user.setAuthority(authority);
session.setAttribute("user", user);
RequestDispatcher dp=req.getRequestDispatcher("sessionLogin.jsp");
dp.forward(req, resp);
}
}
else if("user".equals(authority)){
if("chenfeng".equals(username)&&"chenfeng".equals(password)){
user.setName(username);
user.setPassword(password);
user.setAuthority(authority);
session.setAttribute("user", user);
RequestDispatcher dp=req.getRequestDispatcher("success.jsp");
dp.forward(req, resp);
}
else{
user.setName(username);
user.setAuthority(authority);
session.setAttribute("user", user);
RequestDispatcher dp=req.getRequestDispatcher("sessionLogin.jsp");
dp.forward(req, resp);
}
}
}
}
一个进行存取用户名，用户类型的javabean类
package com.mison;
public class User {
private String name;
private String password;
private String authority;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAuthority() {
return authority;
}
public void setAuthority(String authority) {
this.authority = authority;
}
}
一个显示正确结果的jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.mison.User" %>
<html>
<head>
<title>My JSP 'success.jsp' starting page</title>
</head>
<body>
<%
User user =(User)session.getAttribute("user");
String username =user.getName();
String authority =user.getAuthority();
%>
您好：<%=username%> <br> 欢迎您，您是<%=authority%>;可以直接登录！
</body>
</html>