完整简洁的jsp+servlet+jstl实例

      package jsp.cotroller;

import java.io.IOException;
import java.util.ArrayList;

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

import jsp.impl.Studentimpl;
import jsp.model.Student;

public class StudentSer extends HttpServlet {
	
	
	Studentimpl studentimpl = new Studentimpl(); 
	/**
	 * Constructor of the object.
	 */
	public StudentSer() {
		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 {

		this.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 {
		
		request.setCharacterEncoding("UTF-8");
         
		
		String status = request.getParameter("status");
		if(status.equals("saveStudent")){
			Student  student = new  Student();
			String name = request.getParameter("sname");
			String address = request.getParameter("saddress");
			String[]  hobby = request.getParameterValues("shobby");
			String str = studentimpl.subString(hobby);
			student.setName(name);
			student.setAddress(address);
			student.setHobby(str);
			studentimpl.savaStudent(student);
		}else if(status.equals("queryStudent")){
			String sname = request.getParameter("sname");
			request.getSession().setAttribute("sname", sname);
			ArrayList<Student> students = studentimpl.queryStudent(sname);
			request.setAttribute("studentparam", students);
			RequestDispatcher dispatcher = request.getRequestDispatcher("/queryStudent.jsp");
			dispatcher.forward(request, response);
		}else if(status.equals("deleteStudent")){
			int sid = Integer.parseInt(request.getParameter("sid"));
			studentimpl.deleteStudent(sid);
			String sname = request.getSession().getAttribute("sname").toString();
			ArrayList<Student> students = studentimpl.queryStudent(sname);
			request.setAttribute("studentparam", students);
			RequestDispatcher dispatcher = request.getRequestDispatcher("/queryStudent.jsp");
			dispatcher.forward(request, response);
			//RequestDispatcher dispatcher = request.getRequestDispatcher("/queryStudent.jsp");
			//dispatcher.forward(request, response);
		}else if(status.equals("updateStudent")){
			Student student = new Student();
			String sid = request.getParameter("sid");
			String name = request.getParameter("sname");
			String address = request.getParameter("saddress");
			String[]  hobby = request.getParameterValues("shobby");
			String str = studentimpl.subString(hobby);
			student.setId(sid);
			student.setName(name);
			student.setAddress(address);
			student.setHobby(str);
			studentimpl.updateStudent(student);
		}
			
			
		
	}

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

}