今天做了一个十分简单的jsp内置对象实验，通过生成jsp登录界面，判断登录信息是否正确，正确跳转到显示登录正确信息的界面，否则跳转到显示错误信息的界面。
实验工具：tomcat5.0 Myeclipse
首先是登录界面Login.jsp的代码：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<
<body>
<form action="check.jsp" method="post">
用户名：<input type="text" name="username"/><br/>
密 码：<input type="password" name="passwd"/><br/><br/>
<input type="submit" value="确定"/>
<input type="reset" value="取消"/>
</form>
</body>
</html>
检查登录信息是否正确的check.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<% String Name=request.getParameter("username");
String Passwd=request.getParameter("passwd");
if(Name.equals("liuweifeng") && Passwd.equals("3152052051601"))
{%>
<jsp:forward page="welcome.jsp"/>
<% }else response.sendRedirect("error.jsp");%>
</body>
</html>
登录成功的界面welcome.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<%String Name=request.getParameter("username");%>
欢迎你,<%=Name%>成功登录！
</body>
</html>
登陆失败的界面error.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
对不起，你的信息有误，请重新登录！ <br/>
<form action="login.jsp" method="post">
<input type="submit" value="返回登录"/>
</form>
</body>
</html>
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jsp内置对象
原文地址：http://13271983.blog.51cto.com/13261983/1969592