login.jsp页面
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<body bgcolor="${requestScope.bg}" onload="${requestScope.welcome}">
<h${requestScope.h}>登录
</h${requestScope.h}>
<form name="form1" method="post" action="loginservlet" onsubmit="return check()">
<br>
用户名：<input type="text" name="name" />
<br>
<input type="submit" name="Submit" value="${empty requestScope.name?"提交":name}">
<input type="reset" value="Reset"><br />
${requestScope.err}<br />
${empty param.name?"":name}
</form>
</body>
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loginservlet 的代码：
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String name = request.getParameter("name");
if (name.equals("xiaoxiao")) {
String err="返回 ";
request.setAttribute("err",err);
request.setAttribute("bg", "red");
request.setAttribute("h", "1");
request.setAttribute("welcome", "alert('欢迎您的登录！')");
request.setAttribute("name","登陆成功，欢迎小小");
request.getRequestDispatcher("login.jsp?name=123").forward(request, response);
} else {
String err="返回 ";
request.setAttribute("err",err);
request.setAttribute("bg", "blue");
request.setAttribute("h", "3");
request.setAttribute("name",name);
request.setAttribute("welcome", "alert('欢迎BOY的登录！');");
request.getRequestDispatcher("login.jsp").forward(request, response);
}
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程序虽然简单 但是可以举一反三 在很多地方应该很有用处，拿来和大家分享
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