dispatcherservlet.java

Servlet的初次尝试

package com.sovoadkj;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DispatcherServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DispatcherServlet() {
		super();
	}

	
	private String target = "/hello.jsp";
	
	
	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
//		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		
		request.setAttribute("USER","username");
		request.setAttribute("PASSWORD", "password");
		
		ServletContext context = getServletContext();
		
		System.out.println("Redirecting to" + target);
		RequestDispatcher dispatcher = context.getRequestDispatcher(target);
		
		dispatcher.forward(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init(ServletConfig config) throws ServletException {
		// Put your code here
		super.init(config);
	}

}