Java Web基于Session的登录实现方法
本文实例讲述了JavaWeb基于Session的登录实现方法。分享给大家供大家参考，具体如下：
packagecn.com.login;
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.ArrayList;
importjava.util.List;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassLoginextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
StringuserName=request.getParameter("userName");
Stringpassword=request.getParameter("password");
PrintWriterout=response.getWriter();
List<User>list=Db.getAll();
for(Useruser: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！");
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doGet(request,response);
}
}
classDb
{
publicstaticList<User>list=newArrayList();
static
{
list.add(newUser("aaa","123"));
list.add(newUser("bbb","123"));
list.add(newUser("ccc","123"));
}
publicstaticList<User>getAll()
{
returnlist;
}
}
packagecn.com.login;
publicclassUser{
privateStringuserName;
privateStringpassword;
publicUser(){
super();
//TODOAuto-generatedconstructorstub
}
publicUser(StringuserName,Stringpassword){
super();
this.userName=userName;
this.password=password;
}
publicStringgetUserName(){
returnuserName;
}
publicvoidsetUserName(StringuserName){
this.userName=userName;
}
publicStringgetPassword(){
returnpassword;
}
publicvoidsetPassword(Stringpassword){
this.password=password;
}
}
packagecn.com.login;
importjava.io.IOException;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
/**
*ServletimplementationclassLogOut
*/
publicclassLogOutextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
HttpSessionsession=request.getSession(false);
if(session==null)
{
response.sendRedirect("/Session/index.jsp");
return;
}
session.removeAttribute("user");
response.sendRedirect("/Session/index.jsp");
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doGet(request,response);
}
}
<!DOCTYPEhtml>
<html>
<head>
<title>Index.html</title>
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="thisismypage">
<metahttp-equiv="content-type"content="text/html;charset=UTF-8">
<!--<linkrel="stylesheet"type="text/css"href="./styles.css">-->
</head>
<body>
<formaction="/Session/Login">
用户名：<inputtype="text"name="userName"/><br/>
密码：<inputtype="password"name="password"/><br/>
<inputtype="submit"value="登录"name="login"/>
</form>
</body>
</html>
希望本文所述对大家Javaweb程序设计有所帮助。