Session保存用户名
1.构造登录界面
用户名:
密 码:
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Session保存用户名</title>
</head>
<body>
<form action="doS3" method= "post">
用户名:<input type="text" name="name"/><br/>
密 码:<input type="password" name = "pwd"><br/>
<input type="submit">
</form>
</body>
</html>
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2.获取Session并将用户名保存到Session域对象中
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package com.oaec.session;
import java.io.IOException;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class servletDemo3 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
// req.getAttribute(arg0)
String name = req.getParameter("name");
String pwd = req.getParameter("pwd");
if ("高圆圆".equals(name) && "123".equals(pwd)) {
// 将用户名保存在session中
// 1.获得session
HttpSession session = req.getSession();
// 2.将用户名保存在session中
session.setAttribute("uname", name);
resp.sendRedirect("doS4");
} else {
resp.sendRedirect("index.html");
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
} |
3.从Session中取出数据 并对页面进行保护 没有登录通过URL访问 直接重定向到登录界面 即主页
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package com.oaec.session;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class servletDemo4 extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
//从session中取出数据
HttpSession session = req.getSession(false);
Object object = null;
if (session != null && (object = session.getAttribute("uname"))!=null) {
PrintWriter writer = resp.getWriter();
writer.write("登录成功<br>");
writer.write("欢迎你"+object);
}else {
//没有登录过 直接重定向到主页
resp.sendRedirect("index.html");
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
} |