prototype/src/main/java/org/hso/ecommerce/action/shop/GetRandomArticlesAction.java

@@ -0,0 +1,20 @@
+package org.hso.ecommerce.action.shop;
+
+import org.hso.ecommerce.entities.shop.Article;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class GetRandomArticlesAction {
+
+    public static List<Article> getRandomArticles(int quantity, List<Article> advertisedArticles) {
+        List<Article> randomisedArticles = new ArrayList<Article>();
+        for (int i = 0; i < quantity; i++) {
+            int index = (int) (Math.random() * advertisedArticles.size());
+            randomisedArticles.add(advertisedArticles.remove(index));
+            if(advertisedArticles.size() == 0)
+                break;
+        }
+        return randomisedArticles;
+    }
+}

prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopArticleController.java

@@ -1,6 +1,7 @@
 package org.hso.ecommerce.controller.shop;
 
 import org.apache.tomcat.util.http.fileupload.IOUtils;
+import org.hso.ecommerce.action.shop.GetRandomArticlesAction;
 import org.hso.ecommerce.entities.shop.Article;
 import org.hso.ecommerce.entities.shop.ShoppingCart;
 import org.hso.ecommerce.repos.shop.ArticleRepository;
@@ -16,6 +17,7 @@ import javax.servlet.http.HttpSession;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.ArrayList;
 import java.util.List;
 
 @Controller
@@ -36,7 +38,7 @@ public class ShopArticleController {
         Article article = articleRepository.findArticleById(id);
 
 
-        if(article == null) {
+        if (article == null) {
             request.setAttribute("error", "Der Artikel wurde nicht gefunden.");
             response.setStatus(HttpServletResponse.SC_NOT_FOUND);
             return "error/404";
@@ -51,7 +53,7 @@ public class ShopArticleController {
             model.addAttribute("inStock", false);
         }
 
-        List<Article> commercialArticles = articleRepository.getAdvertisedArticles();
+        List<Article> commercialArticles = GetRandomArticlesAction.getRandomArticles(4, articleRepository.getAdvertisedArticles());
         model.addAttribute("commercialArticles", commercialArticles);
 
 

prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopIndexController.java

@@ -1,5 +1,6 @@
 package org.hso.ecommerce.controller.shop;
 
+import org.hso.ecommerce.action.shop.GetRandomArticlesAction;
 import org.hso.ecommerce.entities.shop.Article;
 import org.hso.ecommerce.repos.shop.ArticleRepository;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -9,6 +10,7 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 
 import javax.servlet.http.HttpSession;
+import java.util.ArrayList;
 import java.util.List;
 
 @Controller
@@ -26,7 +28,7 @@ public class ShopIndexController {
     @GetMapping("/shop/")
     public String shop(Model model, HttpSession session) {
 
-        List<Article> commercialArticles = articleRepository.getAdvertisedArticles();
+        List<Article> commercialArticles = GetRandomArticlesAction.getRandomArticles(8, articleRepository.getAdvertisedArticles());
         model.addAttribute("commercialArticles", commercialArticles);
 
         //check if logged in
@@ -39,7 +41,7 @@ public class ShopIndexController {
 
         if (isLoggedIn) {
             List<Article> suggestedArticles = articleRepository.getLastOrderedArticles("4");
-            if(suggestedArticles.size() > 0) {
+            if (suggestedArticles.size() > 0) {
                 model.addAttribute("suggestedArticles", suggestedArticles);
                 hasOrders = true;
             }

prototype/src/main/resources/templates/shop/articles/id.html

@@ -27,7 +27,7 @@
                     <p th:text="${article.description}"></p>
                 </div>
                 <div class="s">
-                    <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}" class="s"/>
+                    <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}"/>
                 </div>
                 <div class="s"></div>
                 <form class="s" method="POST">
@@ -56,7 +56,7 @@
             <h1>Weitere Schnäppchen</h1>
             <div class='grid m base shadow'>
                 <section th:each="article: ${commercialArticles}"><a th:href="@{/shop/articles/{id}(id = ${article.id})}" class="section">
-                    <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}" class="s"/>
+                    <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}"/>
                     <h2 th:text="${article.title}"></h2>
                     <p class='price' th:text="${article.shopPricePerUnitNetCent}"></p>
                     <p th:text="${article.description}"></p>

prototype/src/main/resources/templates/shop/index.html

@@ -21,7 +21,7 @@
                 <section th:each="article: ${commercialArticles}">
                     <a th:href="@{/shop/articles/{id}(id=${article.id})}" class="section">
 
-                        <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}" class="s"/>
+                        <img th:src="@{/shop/articles/{id}/image.jpg(id=${article.id})}"/>
                         <h2 th:text="${article.title}" />
                         <p class='price' th:text="${article.shopPricePerUnitNetCent}" />
                         <p th:text="${article.description}" />