Rozwiązanie zadania

src/com/zdzislaw/controller/Servlet.java

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+package com.zdzislaw.controller;
+
+import com.zdzislaw.model.FormatterContext;
+
+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 java.io.IOException;
+
+@WebServlet(name = "Servlet", urlPatterns = "/Servlet")
+public class Servlet extends HttpServlet {
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+        String textAreaValue = request.getParameter("textArea");
+        FormatterContext formatterContext = new FormatterContext(request.getParameter("selectedOption"));
+        String newText = null;
+        try {
+            newText = formatterContext.transformText(textAreaValue).trim();
+        } catch (NullPointerException e) {
+            System.out.println("Select correct tranformation");
+        }
+        request.getSession().setAttribute("newText", newText);
+
+        response.sendRedirect("index.jsp");
+    }
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    }
+}

src/com/zdzislaw/model/FormatterContext.java

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+package com.zdzislaw.model;
+
+import com.zdzislaw.model.transformations.Lowercase;
+import com.zdzislaw.model.transformations.Mixedcase;
+import com.zdzislaw.model.transformations.Uppercase;
+
+public class FormatterContext {
+    private ITextFormatter textFormatter = null;
+
+    public FormatterContext(String modifyType) {
+        if (modifyType.equals("lowercase")) {
+            textFormatter = new Lowercase();
+        } else if (modifyType.equals("uppercase")) {
+            textFormatter = new Uppercase();
+        } else if (modifyType.equals("mixedcase")) {
+            textFormatter = new Mixedcase();
+        }
+    }
+
+    public String transformText(String sourceText) {
+
+
+        String newText = textFormatter.modifyText(sourceText);
+
+        System.out.println("zly argument");
+
+        return newText;
+    }
+}
+

src/com/zdzislaw/model/ITextFormatter.java

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+package com.zdzislaw.model;
+
+public interface ITextFormatter {
+
+    String modifyText(String text);
+}

src/com/zdzislaw/model/transformations/Lowercase.java

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+package com.zdzislaw.model.transformations;
+
+import com.zdzislaw.model.ITextFormatter;
+
+public class Lowercase implements ITextFormatter {
+
+    @Override
+    public String modifyText(String text) {
+        return text.toLowerCase();
+    }
+}

src/com/zdzislaw/model/transformations/Mixedcase.java

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+package com.zdzislaw.model.transformations;
+
+import com.zdzislaw.model.ITextFormatter;
+
+public class Mixedcase implements ITextFormatter {
+    @Override
+    public String modifyText(String text) {
+        int lenght = text.length();
+        StringBuilder sb = new StringBuilder();
+        for (int i = 1; i < lenght; i++) {
+            if (i % 2 == 0)
+
+                sb.append(Character.toLowerCase(text.charAt(i)));
+
+
+            else
+                sb.append(Character.toUpperCase(text.charAt(i)));
+        }
+        return sb.toString();
+    }
+}

src/com/zdzislaw/model/transformations/Uppercase.java

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+package com.zdzislaw.model.transformations;
+
+import com.zdzislaw.model.ITextFormatter;
+
+public class Uppercase implements ITextFormatter {
+
+    @Override
+    public String modifyText(String text) {
+        return text.toUpperCase();
+    }
+}

web/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
+         version="4.0">
+</web-app>

web/index.jsp

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+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>$Title$</title>
+    <link rel="stylesheet" href="style.css">
+</head>
+<body>
+<%
+    String text = "Lorem ipsum dolor amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur ullamcorper ultricies nisi. Nam eget dui.";
+%>
+<%
+    if (session.getAttribute("newText") != null)
+        text = (String) session.getAttribute("newText");
+%>
+<div class="View">
+    <form action=Servlet method="post">
+  <textarea name="textArea" rows="10" cols="100">
+    <%=text%>
+  </textarea>
+        <br>
+
+        <select id="selectedOption" name="selectedOption">
+            <option>Choose transformation</option>
+            <option value="lowercase">Lowercase</option>
+            <option value="uppercase">Uppercase</option>
+            <option value="mixedcase">Mixedcase</option>
+        </select>
+        <br>
+        <button type="submit">Modify</button>
+    </form>
+</div>
+</body>
+</html>

web/style.css

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+.View {
+    text-align: center;
+
+}
+
+select {
+    text-align: center;
+    font-size: 16px;
+    margin-top: 10px;
+}
+
+button {
+    width: 100px;
+    font-size: 18px;
+    margin: 20px;
+    border-radius: 6px;
+    border: none;
+    background-color: green;
+    color: white;
+}
+
+
+