登录验证题目

CheckServlet.java

package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet("/check")
public class CheckServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("gbk");
		response.setCharacterEncoding("gbk");
		
		String name=request.getParameter("name11");
		String password=request.getParameter("password11");
		
		if("admin".equals(name)&&"123".equals(password)) {
			HttpSession session=request.getSession();
			session.setAttribute("info",name);
			request.getRequestDispatcher("welcome").forward(request, response);
		}else {
			request.getRequestDispatcher("index.html").forward(request, response);
		}	
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

WelcomeServlet.java

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.jasper.tagplugins.jstl.core.Out;

@WebServlet("/welcome")
public class WelcomeServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("gbk");
		response.setCharacterEncoding("gbk");
		response.setContentType("text/html");
		PrintWriter out=response.getWriter();
		out.print("");
		out.print("");
		out.print("");
		out.print("");
		HttpSession session=request.getSession();
		String info=(String)session.getAttribute("info");
		if(info==null) {
			request.getRequestDispatcher("index.html").forward(request, response);			
		}else {
			out.print("welcome");
			out.print("欢迎你来到青岛职业技术学院");
		}
		out.print("");
		out.print("");
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

index.html

	

	用户名：

	密码：

	

	

这是文件的位置

1.  添加到tomcat服务器上
2. 运行服务器
3. 在浏览器上输入http://127.0.0.1:8080/demo1104/index.html