controllerservlet.java

达内JAVA培训-WEB课程部分项目源代码

package cn.com.tarena.web.servlet.day3.control;

import java.io.IOException;
import java.util.List;

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

import cn.com.tarena.web.servlet.day3.biz.StudentBiz;

public class ControllerServlet extends HttpServlet{
	public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
		String path = request.getServletPath();
		
		path = path.substring(0,path.lastIndexOf("."));
		
		if("/servlet/day3/studentList".equals(path)){
			showStudentList(request, response);
		}
	}

	private void showStudentList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try{
			StudentBiz studentBiz = new StudentBiz();
			List studentList = studentBiz.findAll();
			
			//把studentList保存在请求的属性中，转发至的下一个Servlet，可以根据属性名获得此对象
			request.setAttribute("studentList", studentList);
			
			//获得ServletContext
			ServletContext context = getServletContext();
			
			//获得请求分发器
			RequestDispatcher dispatcher = context.getRequestDispatcher("/servlet/day3/studentList3");
			
			//转发
			dispatcher.forward(request, response);
			
//			response.sendRedirect("http://www.google.cn/search?hl=zh-CN&q=%E8%BE%BE%E5%86%85&meta=&aq=f");
		} catch (Exception e) {
			//把错误信息保存在请求的属性中，转发至的下一个Servlet，可以根据属性名获得此对象
			request.setAttribute("message", e.getMessage());
			
			//获得ServletContext
			ServletContext context = getServletContext();
			
			//获得请求分发器
			RequestDispatcher dispatcher = context.getRequestDispatcher("/servlet/day3/error");
			
			//转发
			dispatcher.forward(request, response);
		}
	}

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