BAEL-1740: Cleanup and Annotation Approach

javax-servlets/src/main/java/com/baeldung/Constants.java

@@ -1,12 +1,11 @@
-package com.baeldung.servlets;
+package com.baeldung;
 
 public class Constants {
 
   public static final String UPLOAD_DIRECTORY = "upload";
-  public static final String ENDPOINT = "/jspupload/uploadFile";
+  public static final String DEFAULT_FILENAME = "default.file";
 
   public static final int MEMORY_THRESHOLD = 1024 * 1024 * 3;
   public static final int MAX_FILE_SIZE = 1024 * 1024 * 40;
   public static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50;
-
 }

javax-servlets/src/main/java/com/baeldung/servlets/FormServlet.java

@@ -24,10 +24,10 @@ public class FormServlet extends HttpServlet {
             response.setHeader("Test", "Success");
             response.setHeader("BMI", String.valueOf(bmi));
 
-            RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/jsp/upload.jsp");
+            RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/jsp/index.jsp");
             dispatcher.forward(request, response);
         } catch (Exception e) {
-            response.sendRedirect("upload.jsp");
+            response.sendRedirect("index.jsp");
         }
     }
 

javax-servlets/src/main/java/com/baeldung/servlets/MultipartServlet.java

@@ -0,0 +1,49 @@
+package com.baeldung.servlets;
+
+import com.baeldung.Constants;
+
+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;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import static com.baeldung.Constants.UPLOAD_DIRECTORY;
+
+@MultipartConfig(fileSizeThreshold = 1024 * 1024, maxFileSize = 1024 * 1024 * 5, maxRequestSize = 1024 * 1024 * 5 * 5)
+public class MultipartServlet extends HttpServlet {
+
+    private static final long serialVersionUID = 1L;
+
+    private String getFileName(Part part) {
+        for (String content : part.getHeader("content-disposition").split(";")) {
+            if (content.trim().startsWith("filename"))
+                return content.substring(content.indexOf("=") + 2, content.length() - 1);
+        }
+        return Constants.DEFAULT_FILENAME;
+    }
+
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+        String uploadPath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;
+        File uploadDir = new File(uploadPath);
+        if (!uploadDir.exists())
+            uploadDir.mkdir();
+
+        try {
+            String fileName = "";
+            for (Part part : request.getParts()) {
+                fileName = getFileName(part);
+                part.write(uploadPath + File.separator + fileName);
+            }
+            request.setAttribute("message", "File " + fileName + " has uploaded successfully!");
+        } catch (FileNotFoundException fne) {
+            request.setAttribute("message", "There was an error: " + fne.getMessage());
+        }
+        getServletContext().getRequestDispatcher("/result.jsp").forward(request, response);
+    }
+}

javax-servlets/src/main/java/com/baeldung/servlets/UploadServlet.java

@@ -1,27 +1,24 @@
 package com.baeldung.servlets;
 
-import static com.baeldung.servlets.Constants.MAX_FILE_SIZE;
-import static com.baeldung.servlets.Constants.MAX_REQUEST_SIZE;
-import static com.baeldung.servlets.Constants.MEMORY_THRESHOLD;
-import static com.baeldung.servlets.Constants.UPLOAD_DIRECTORY;
+import org.apache.commons.fileupload.FileItem;
+import org.apache.commons.fileupload.disk.DiskFileItemFactory;
+import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
-import java.io.File;
-import java.io.IOException;
-import java.util.List;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import org.apache.commons.fileupload.FileItem;
-import org.apache.commons.fileupload.disk.DiskFileItemFactory;
-import org.apache.commons.fileupload.servlet.ServletFileUpload;
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+import static com.baeldung.Constants.*;
 
 public class UploadServlet extends HttpServlet {
 
     private static final long serialVersionUID = 1L;
 
-	protected void doPost(HttpServletRequest request, HttpServletResponse response)
-			throws ServletException, IOException {
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
         if (ServletFileUpload.isMultipartContent(request)) {
 

javax-servlets/src/main/webapp/WEB-INF/web.xml

@@ -12,4 +12,13 @@
     <servlet-name>UploadServlet</servlet-name>
     <url-pattern>/uploadFile</url-pattern>
   </servlet-mapping>
+
+  <servlet>
+    <servlet-name>MultiPartServlet</servlet-name>
+    <servlet-class>com.baeldung.servlets.MultipartServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>MultiPartServlet</servlet-name>
+    <url-pattern>/multiPartServlet</url-pattern>
+  </servlet-mapping>
 </web-app>

javax-servlets/src/main/webapp/upload.jsp

@@ -8,8 +8,16 @@
 </head>
 
 <body>
+    <div>Apache FileUpload</div>
     <form method="post" action="uploadFile" enctype="multipart/form-data">
         Choose a file: <input type="file" name="uploadFile"/><input type="submit" value="Upload"/>
     </form>
+
+    </br>
+
+    <div>Servlet Multipart</div>
+    <form method="post" action="multiPartServlet" enctype="multipart/form-data">
+        Choose a file: <input type="file" name="multiPartServlet"/><input type="submit" value="Upload"/>
+    </form>
 </body>
 </html>