MyJavawebProject/src/com/servlet/FindByIdServlet.java

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.StuDao;
import com.dao.StuDaoImpl;

/**
 * Servlet implementation class FindByIdServlet
 */
@WebServlet("/FindByIdServlet")
public class FindByIdServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FindByIdServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		

		String id = request.getParameter("id");
		
		StuDao ud = new StuDaoImpl();
		
		if(id!= "") {
			if(ud.getStuById(id).isEmpty()) 
			{
				System.out.println("查询到的为空值");
				response.sendRedirect("error.jsp");
			}else 
			{
				request.setAttribute("findlist", ud.getStuById(id));  //向request域中放置参数
				request.setAttribute("message", " 查找成功");
				request.getRequestDispatcher("/findlist.jsp").forward(request, response);  //转发到登录页面
			}
		}else {
			response.sendRedirect("error.jsp");
		}