jsp+servlet实现的验证登陆

可以将业务逻辑处理和视图相分离，使用jsp界面表示视图，使用servlet处理业务逻辑

<%@ 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=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

<%

String msg=(String)request.getAttribute("msg");

if(msg!=null){

out.print(msg);

}

%>

<form action="dologin" method="post">

username:<input type="text" name="username" /><br>

password:<input type="password" name="password" /><br>

<input type="submit" value="submit" />

</form>

</body>

</html>

success.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=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

登陆成功

<%

String username=request.getParameter("username");

out.print(username+"欢迎你");

 %>

</body>

</html>

fail.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=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

登陆成功

<%

String username=request.getParameter("username");

out.print(username+"欢迎你");

 %>

</body>

</html>

业务逻辑处理

com.zk.myservlet.dologin.java

public class dologin extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

	//获取表单数据

	String username=request.getParameter("username");

	String password=request.getParameter("password");

	//处理业务逻辑

	if("Tom".equals(username)&&"123".equals(password))

	{

	//分发转向

	request.getSession().setAttribute("username", username);

	request.getRequestDispatcher("/success.jsp").forward(request, response);

	//response.sendRedirect(request.getContextPath()+"/success.jsp");//丢失 username参数值 ，一次请求

	}

	else

	{

	//分发转向

	//request.getRequestDispatcher("/fail.jsp").forward(request,response);

	//response.sendRedirect(request.getContextPath()+"/fail.jsp");

          request.setAttribute("msg", "用户名密码不正确");

	  request.getRequestDispatcher("/login.jsp").forward(request,response);

	}

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request,response);

	}

}

巴特西

jsp+servlet实现的验证登陆

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