java web分层之——2层架构

2层架构，JSP+Servlet

login.jsp

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web.xml
package control;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class DoLoginServlet extends HttpServlet {private static final long serialVersionUID = 1L;@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String encoding = "GBK";request.setCharacterEncoding(encoding);response.setCharacterEncoding(encoding);  String userName = request.getParameter("username");  String password = request.getParameter("password");    if("黄启庆".equals(userName) && "123456".equals(password)){  request.getRequestDispatcher("success.jsp").forward(request, response);  }else{  request.getRequestDispatcher("fail.jsp").forward(request, response);  }}}
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