Java Web基于Session的登录实现方法
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2024-03-07 12:21:03
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：
package cn.com.login;
import ja...
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：
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>
希望本文所述对大家java web程序设计有所帮助。