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Как сервлеты переделать в Spring
#39796075
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Я сделал проект с помощью сервлетов, но надо его переделать на Spring с помощью @controller. Я книгу прочитал но не получается. Буду благодарен за помощь
MyServlet
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package servlet;
import dao.DatabaseDAO;
import entity.Student;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import static java.lang.Integer.parseInt;
import java.util.List;
public class MyServlet extends HttpServlet {
private DatabaseDAO dao;
@Override
public void init() throws ServletException {
dao = new DatabaseDAO();
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String action = request.getParameter("actionname");
if (action.equals("RemoveStudent")) {
int id = parseInt(request.getParameter("id"));
boolean deleted = dao.deleteStudentFromDB(id);
String message;
if (deleted) {
message = "Студент удален.";
} else {
message = "Студент не существует";
}
request.setAttribute("message", message);
List<Student> students = dao.readAllStudentsFromDB();
request.setAttribute("students", students);
request.getRequestDispatcher("ShowAllStudent.jsp").forward(request, response);
}
if (action.equals("ShowAllStudent")) {
List<Student> students = dao.readAllStudentsFromDB();
request.setAttribute("students", students);
request.getRequestDispatcher("ShowAllStudent.jsp").forward(request, response);
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
AddStudentServlet
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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package servlet;
import dao.DatabaseDAO;
import entity.Student;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@MultipartConfig(fileSizeThreshold = 1024 * 1024 * 2, // 2MB
maxFileSize = 1024 * 1024 * 10, // 10MB
maxRequestSize = 1024 * 1024 * 50) // 50MB
public class AddStudentServlet extends HttpServlet {
/**
* Name of the directory where uploaded files will be saved, relative to the
* web application directory.
*/
private static final String SAVE_DIR = "images";
private DatabaseDAO dao;
@Override
public void init() throws ServletException {
dao = new DatabaseDAO();
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// creates the save directory if it does not exists
String savePath = "C:\\Pictures";
File fileSaveDir = new File(savePath);
if (!fileSaveDir.exists()) {
fileSaveDir.mkdirs();
}
String name = request.getParameter("name");
String surname = request.getParameter("surname");
String fileName;
for (Part part : request.getParts()) {
String contentDisp = part.getHeader("content-disposition");
String[] items = contentDisp.split(";");
for (String item : items) {
String ss = item.trim();
if (ss.startsWith("filename")) {
try {
int id = dao.insertStudentIntoDB(name, surname);
fileName = String.valueOf(id);
String fileExt = ss.substring(ss.lastIndexOf("."), ss.length() - 1); // расширение включая точку
String fullPath = savePath + File.separator + fileName + fileExt;
part.write(fullPath);
dao.updateStudentImage(id, fullPath);
request.setAttribute("message", "Студент добавлен.");
} catch (IOException e) {
request.setAttribute("message", "Ошибка при добавлении студента!");
}
}
}
}
List<Student> students = dao.readAllStudentsFromDB();
request.setAttribute("students", students);
request.getRequestDispatcher("ShowAllStudent.jsp").forward(request, response);
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
GetImage Servlet
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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package servlet;
import dao.DatabaseDAO;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class GetImage extends HttpServlet {
private DatabaseDAO dao;
@Override
public void init() throws ServletException {
dao = new DatabaseDAO();
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
int id = Integer.parseInt(request.getParameter("id"));
String fullPath = dao.readStudentImagePath(id);
response.setContentType("image/jpeg");
try (BufferedInputStream bin = new BufferedInputStream(new FileInputStream(fullPath));
BufferedOutputStream bout = new BufferedOutputStream(response.getOutputStream())) {
int ch = 0;
while ((ch = bin.read()) != -1) {
bout.write(ch);
}
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
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