jsp原理:
项目目录：
login.jsp代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/jsp/dologin.jsp" method="post">
用户名：<input type="text" name="username" value="username"><br>
密码：<input type="password" name="userpassword" value="userpassword"><br/>
<input type="submit" name="submint" value="submit">
</form>
</body>
</html>dologin代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
//获取表单数据
String username=request.getParameter("username");
String userpassowrd=request.getParameter("userpassword");
//处理业务逻辑
if("tom".equals(username)&&"123".equals(userpassowrd)){
request.getRequestDispatcher("/succes.jsp").forward(request, response);
}else{
response.sendRedirect("/jsp/login.jsp");
}
//分发转向
%>
</body>
</html>succes.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
欢迎你<%
String username=request.getParameter("username");
out.print(username);
%>
</body>
</html>运行效果：
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