sysservlet.java

这是一个过滤器的Demo.大家可以参考下.希望能对大家有所帮助.

package com.accp.servlet;

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;

import com.accp.action.Action;
import com.accp.action.AddAction;
import com.accp.action.StrAction;
import com.accp.action.SubAction;

public class SysServlet extends HttpServlet {

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

	/**
	 * 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 {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		String path = request.getServletPath();
		String type = path.substring(path.indexOf("/")+1,path.length()-3);
		
		//根据动作类型调用不同action
		String goUrl = "";
		Action action = null; 
		
		if("add".equals(type)){
			action = new AddAction();
		}else if("sub".equals(type)){
			action = new SubAction();
		}else if("str".equals(type)){
			action = new StrAction();
		}
		
		goUrl = action.doAction(request, response);
		//派发视图
		request.getRequestDispatcher(goUrl).forward(request, response);
		out.flush();
		out.close();
	}

	/**
	 * 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 {

		doGet(request, response);
	}

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

}