2023.5.26每日总结

package servlets;

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

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 student.bean.studentInfo;

/**
 * Servlet implementation class studentController
 */
@WebServlet("/studentController")
public class studentController extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public studentController() {
        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
        request.setCharacterEncoding("utf-8");

        String actionUrl = request.getServletPath(); // 获取客户请求的Servlet地址

        if (actionUrl.equals("/index.do")) { // 查询所有图书
            ArrayList<studentInfo> list = studentInfo.getstudentList(); // 调用studentInfo的getBookList方法查询所有图书，赋值给list
            request.setAttribute("list", list); // 在request增加属性list，其结果为list对象
            request.getRequestDispatcher("/index.jsp").forward(request, response);// 重定向至index.jsp进行显示

        } else if (actionUrl.equals("/addview.do")) { // 新增图书显示页面
            request.getRequestDispatcher("add.html").forward(request, response); 
        } else if (actionUrl.equals("/add.do")) { // 新增图书
            studentInfo bi = new studentInfo();
            bi.setName(request.getParameter("Name"));
            bi.setSex(request.getParameter("Sex"));
            bi.setBirth(request.getParameter("Birth"));
            int r = studentInfo.addstudent(bi); // 调用studentInfor的addstudent方法完成
            if (r == 1)
                request.getRequestDispatcher("success.html").forward(request, response); // 成功的话重定向至success.html
            else
                request.getRequestDispatcher("failure.html").forward(request, response); // 失败的话重定向至failure.html

        } else if (actionUrl.equals("/edit.do")) { // 客户端要对指定id的图书进行修改
            String id = request.getParameter("id");
            studentInfo bi = studentInfo.getstudentById(id); // 调用studentInfo的getstudentById方法获取图书信息，赋值给bi对象
            request.setAttribute("bi", bi); // 将bi对象增加到request的属性中
            request.getRequestDispatcher("/edit.jsp").forward(request, response);// 重定向至edit.jsp进行显示

        } else if (actionUrl.equals("/update.do")) { // 用户输入要修改的图书的信息之后需要保存到数据库
            studentInfo bi = new studentInfo();
            bi.setId(request.getParameter("id"));
            bi.setName(request.getParameter("name"));
            bi.setSex(request.getParameter("sex"));
            bi.setBirth(request.getParameter("birth"));
            int r = studentInfo.updatestudent(bi);// 调用studentInfo的updatestudent方法实现
            if (r == 1)
                request.getRequestDispatcher("/success.html").forward(request, response);// 成功的话重定向至success.html
            else
                request.getRequestDispatcher("/failure.html").forward(request, response);// 失败的话重定向至failure.html

        } else if (actionUrl.equals("/delete.do")) { // 用户需要删除指定id的图书
            String id = request.getParameter("id");
            int r = studentInfo.deletestudent(id); // 调用studentInfo的deletestudent方法实现
            if (r == 1)
                request.getRequestDispatcher("/success.html").forward(request, response);// 成功的话重定向至success.html
            else
                request.getRequestDispatcher("/failure.html").forward(request, response);// 失败的话重定向至failure.html
        }
    
    }

}