简单的Servlet登录小例子

servlet代码：

package com.wjrong.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class LoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String host="/index.jsp";
		request.setCharacterEncoding("UTF-8");
		String name=request.getParameter("username");
		String password=request.getParameter("password");
		if(name.equals("jack") && password.equals("abcd")){
			host="/welcome.jsp";
		}
		request.getRequestDispatcher(host).forward(request, response);

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doGet(request, response);
	}

}