findcourseservlet.java

来自「jsp的课程实践」· Java 代码 · 共 93 行

package StudentCourse.servlets;

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

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 course.beans.Course;
import course.dao.CourseDAO;

public class FindCourseServlet extends HttpServlet {

	private CourseDAO couDao;
	/**
	 * Constructor of the object.
	 */
	public FindCourseServlet() {
		super();
		couDao=new CourseDAO();
	}

	/**
	 * 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 {
          RequestDispatcher rd=null;
          ServletContext sc=this.getServletContext();
          String argCourseId=request.getParameter("courseId");
          String argCourseName=request.getParameter("courseName");
          String argTeacher=request.getParameter("teacher");
          String argCourseDes=request.getParameter("courseDes");
          String argCredit=request.getParameter("credit");
          ArrayList<Course>courses=couDao.findCourse(argCourseId, argCourseName, argTeacher, argCourseDes, argCredit);
          if(courses.size()!=0)
          {
        	  request.setAttribute("courses", courses);
        	  rd=sc.getRequestDispatcher("/display.jsp");
          }
          else
          {
        	  request.setAttribute("error", "课程表中未查到您想要的信息！");
			  rd=sc.getRequestDispatcher("/error.jsp");
          }
         rd.forward(request, response);
	}

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

}