Servlet不断抽取案例

ServletDemo02

package cn.itcast.servlet;

import java.io.IOException;
import java.lang.reflect.Method;

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


public class ServletDemo02 extends HttpServlet {
	private static final long serialVersionUID = 1L;
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	
		String md=request.getParameter("method");
	
		String path=null;
		//获取到当前字节码对象（ServletDemo2.class在内存中的对象）
		Class clazz = this.getClass();
		try {
			//获取clazz上名称为md的方法
			Method method=clazz.getMethod(md, HttpServletRequest.class,HttpServletResponse.class);
			if(null!=method){
				//调用找到的方法
				path=(String)method.invoke(this, request,response);
			}
			if(null!=path){
				//服务端的转发
				request.getRequestDispatcher(path).forward(request, response);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} 
		
		
		
	}

	public String addStu(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		return "/test.html";
		
	}
	public String delStu(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		return "/test.html";
		
	}
	public String checkStu(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.getWriter().println("DDDDDD");
		return null;
	}

}