本文实例讲述了Java Web基于Session的登录实现方法。分享给大家供大家参考,具体如下:
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package cn.com.login;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding( "UTF-8" );
response.setContentType( "text/html;charset=UTF-8" );
String userName=request.getParameter( "userName" );
String password=request.getParameter( "password" );
PrintWriter out=response.getWriter();
List<User> list=Db.getAll();
for (User user:list)
{
if (user.getUserName().equals(userName)&&user.getPassword().equals(password))
{
request.getSession().setAttribute( "user" , user);
response.sendRedirect( "/Session/index.jsp" );
return ;
}
}
out.write( "用户名或者密码错误!" );
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
}
class Db
{
public static List<User> list= new ArrayList();
static
{
list.add( new User( "aaa" , "123" ));
list.add( new User( "bbb" , "123" ));
list.add( new User( "ccc" , "123" ));
}
public static List<User> getAll()
{
return list;
}
}
package cn.com.login;
public class User {
private String userName;
private String password;
public User() {
super ();
// TODO Auto-generated constructor stub
}
public User(String userName, String password) {
super ();
this .userName = userName;
this .password = password;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this .userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this .password = password;
}
}
package cn.com.login;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class LogOut
*/
public class LogOut extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session=request.getSession( false );
if (session== null )
{
response.sendRedirect( "/Session/index.jsp" );
return ;
}
session.removeAttribute( "user" );
response.sendRedirect( "/Session/index.jsp" );
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
}
<!DOCTYPE html>
<html>
<head>
<title>Index.html</title>
<meta http-equiv= "keywords" content= "keyword1,keyword2,keyword3" >
<meta http-equiv= "description" content= "this is my page" >
<meta http-equiv= "content-type" content= "text/html; charset=UTF-8" >
<!--<link rel= "stylesheet" type= "text/css" href= "./styles.css" >-->
</head>
<body>
<form action= "/Session/Login" >
用户名:<input type= "text" name= "userName" /><br/>
密码:<input type= "password" name= "password" /><br/>
<input type= "submit" value= "登录" name= "login" />
</form>
</body>
</html>
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希望本文所述对大家Java web程序设计有所帮助。