+ error messages for file upload

src/main/java/de/hsel/spm/baudas/web/ErrorCode.java

@@ -0,0 +1,14 @@
+package de.hsel.spm.baudas.web;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum ErrorCode {
+    FILE_NOT_FOUND ("Die Hochgeladene Datei konnte nicht gefunden werden"),
+    EMPTY_FILE ("Die Hochgeladene Datei ist leer"),
+    INVALID_FORMAT("Die Hochgeladene Datei hat ein falsches Format");
+
+    private String message;
+}

src/main/java/de/hsel/spm/baudas/web/Upload.java

@@ -1,6 +1,7 @@
 package de.hsel.spm.baudas.web;
 
 import org.jetbrains.annotations.NotNull;
+import weka.core.converters.CSVLoader;
 
 import javax.servlet.ServletException;
 import javax.servlet.annotation.MultipartConfig;
@@ -32,15 +33,57 @@ public class Upload extends HttpServlet {
     private static final long serialVersionUID = 14144111845151L;
 
 
+    private boolean checkFormat(InputStream stream) {
+        CSVLoader loader = new CSVLoader();
+        try {
+            loader.setSource(stream);
+            return loader.getDataSet() != null;
+        } catch (IOException e) {
+            return false;
+        }
+    }
+
     @Override
     protected void doPost(@NotNull HttpServletRequest req, HttpServletResponse resp)
             throws ServletException, IOException {
         req.setCharacterEncoding(StandardCharsets.UTF_8.name());
 
         Part filePart = req.getPart("file");
+
+        if(filePart == null){
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.FILE_NOT_FOUND);
+            return;
+        }
+
+        if(filePart.getSubmittedFileName() == null){
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.FILE_NOT_FOUND);
+            return;
+        }
+
         String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString();
+
+        if(fileName == null){
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.FILE_NOT_FOUND);
+            return;
+        }
+
         InputStream inputStream = filePart.getInputStream();
 
+        if(inputStream == null){
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.FILE_NOT_FOUND);
+            return;
+        }
+        if(inputStream.available() == 0) {
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.EMPTY_FILE);
+            return;
+        }
+
+        if(!checkFormat(inputStream)){
+            resp.sendRedirect("error.jsp?code=" + ErrorCode.INVALID_FORMAT);
+            return;
+        }else{
+            inputStream = filePart.getInputStream();
+        }
 
         Path path = Data.add(fileName);
         if (!Files.exists(path)) {
@@ -49,6 +92,7 @@ public class Upload extends HttpServlet {
 
         Files.copy(inputStream, path, StandardCopyOption.REPLACE_EXISTING);
 
+
         resp.sendRedirect("");
     }
 }

src/main/webapp/emptyHeader.jsp

@@ -0,0 +1,13 @@
+
+<%@include file="head.jsp"%>
+
+<!--Navbar-->
+<div class="navbar-fixed">
+    <nav class="nav-extended blue-grey darken-3 white-text row">
+        <a href="#" class="brand-logo hide-on-small-and-down center">BauDas</a>
+        <!--Navbar Items-->
+        <div class="nav-wrapper col 2 right">
+        </div>
+    </nav>
+</div>
+<br>

src/main/webapp/error.jsp

@@ -0,0 +1,36 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: julian
+  Date: 21.05.19
+  Time: 14:21
+  To change this template use File | Settings | File Templates.
+--%>
+
+<%@ page import="java.nio.charset.StandardCharsets" %>
+<%@ page import="de.hsel.spm.baudas.web.ErrorCode" %>
+<%@ page contentType="text/html;charset=UTF-8" %>
+<%@include file="emptyHeader.jsp"%>
+<% response.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
+<% request.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
+
+<%
+    String code = request.getParameter("code");
+    if(code != null){
+        ErrorCode errorCode = ErrorCode.valueOf(code);
+%>
+
+<div class="row">
+    <div class="col s4 push-s4">
+        <div class="card-panel red darken-1">
+        <h5 class="white-text center-align">
+            <%= errorCode.getMessage()%>
+        </h5>
+        </div>
+    </div>
+</div>
+<%
+    }
+%>
+
+
+<%@include file="theming.jsp"%>

src/main/webapp/footer.jsp

@@ -6,10 +6,8 @@
 
 <!--Script für Materlialize-->
 <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
-<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
-<script>
-    M.AutoInit();
-</script>
+
+<%@include file="theming.jsp"%>
 
 <script src="js/cache.js"></script>
 

src/main/webapp/head.jsp

@@ -0,0 +1,21 @@
+<% response.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
+<% request.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
+<!DOCTYPE html>
+<html lang="de">
+<head>
+    <title>BauDas</title>
+    <!--Import Google Icon Font-->
+    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
+    <!--Import materialize.css-->
+    <link type="text/css" rel="stylesheet"
+          href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css"
+          media="screen,projection"/>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.css"
+          integrity="sha256-aa0xaJgmK/X74WM224KMQeNQC2xYKwlAt08oZqjeF0E=" crossorigin="anonymous"/>
+    <meta charset="UTF-8">
+    <META HTTP-EQUIV="content-type" CONTENT="text/html; charset=utf-8">
+
+    <!--Let browser know website is optimized for mobile-->
+    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+
+</head>

src/main/webapp/index.jsp

@@ -1,6 +1,6 @@
 <%@ page import="java.nio.charset.StandardCharsets" %>
 <%@ page contentType="text/html;charset=UTF-8" %>
-<%@include file="header.jsp"%>
+<%@include file="menu.jsp"%>
 <% response.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
 <% request.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
 

src/main/webapp/menu.jsp

@@ -1,26 +1,6 @@
-<% response.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
-<% request.setCharacterEncoding(StandardCharsets.UTF_8.name()); %>
-<!DOCTYPE html>
-<html lang="de">
-<head>
-    <title>BauDas</title>
-    <!--Import Google Icon Font-->
-    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
-    <!--Import materialize.css-->
-    <link type="text/css" rel="stylesheet"
-          href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css"
-          media="screen,projection"/>
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.css"
-          integrity="sha256-aa0xaJgmK/X74WM224KMQeNQC2xYKwlAt08oZqjeF0E=" crossorigin="anonymous"/>
-    <meta charset="UTF-8">
-    <META HTTP-EQUIV="content-type" CONTENT="text/html; charset=utf-8">
 
-    <!--Let browser know website is optimized for mobile-->
-    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+<%@include file="head.jsp"%>
 
-
-</head>
-<body class="blue-grey lighten-5">
 <!--Navbar-->
 <div class="navbar-fixed">
     <nav class="nav-extended blue-grey darken-3 white-text row">
@@ -109,4 +89,4 @@
             </button>
         </li>
     </form>
-</ul>
+</ul>

src/main/webapp/theming.jsp

@@ -0,0 +1,4 @@
+<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
+<script>
+    M.AutoInit();
+</script>