标签：content enc array 首页 dex 用户 div rac rate
一、index.jsp
<form action="index" method="get"> 账户：<input type="text" name="username"/></br> 密码：<input type="password" name="password"/></br> <input type="submit" value="提交"/> </form>
二、LoginServlet
public class LoginServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
req.setCharacterEncoding("utf-8");
PrintWriter pw=resp.getWriter();
String username=req.getParameter("username");
String password=req.getParameter("password");
List<User> list=DB.getAll();
for(User user:list){
if(user.getUsername().equals(username) && user.getPassword().equals(password)){
pw.write("成功登陆！！");
HttpSession session=req.getSession();
//登陆成功，向session存入一个登陆标记
session.setAttribute("user",user);
//跳转首页，用重定向，url地址发生变化，用户能看到地址的变化
resp.sendRedirect("login.jsp");
return;
}
}
pw.write("用户名或密码不对！！！");
resp.sendRedirect("login.jsp");
}
}
class DB{
public static List list=new ArrayList();
static {
list.add(new User("张三","123"));
list.add(new User("李四","abc"));
list.add(new User("王五","12345"));
}
public static List getAll(){
return list;
}
}
三、login.jsp
<body>
<h1>欢迎您： ${user.username} ！！</h1>
<a href="index.jsp">登录</a>
<a href="loginout">退出登录</a>
</body>
四、web.xml
<servlet>
<servlet-name>session</servlet-name>
<servlet-class>cn.itcast.login.LoginServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>loginout</servlet-name>
<servlet-class>cn.itcast.login.LoginOutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginout</servlet-name>
<url-pattern>/loginout</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>session</servlet-name>
<url-pattern>/index</url-pattern>
</servlet-mapping>
五、退出登录
//注销用户
public class LoginOutServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
//只获得session,不获取session
HttpSession session=req.getSession(false);
if(session==null){
resp.sendRedirect("login.jsp");
}
session.removeAttribute("user");
resp.sendRedirect("login.jsp");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
super.doPost(req, resp);
}
}
标签：content enc array 首页 dex 用户 div rac rate
原文地址：http://www.cnblogs.com/syj1993/p/7189663.html
