发布于 2016-07-21 04:25:11 | 147 次阅读 | 评论: 0 | 来源: 网友投递
Java程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)）的总称。
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。