Dodanie projektu Jakarta1 - wersja bezpośrednio z zajęć

jakarta1/.gitignore

+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file

jakarta1/.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

jakarta1/.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file

jakarta1/.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="temurin-21 (2)" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

jakarta1/.mvn/wrapper/maven-wrapper.properties

+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.5/apache-maven-3.8.5-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar
\ No newline at end of file

jakarta1/mvnw.cmd

+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

jakarta1/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>jakarta1</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>jakarta1</name>
+    <packaging>war</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.target>21</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <junit.version>5.10.2</junit.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>jakarta.platform</groupId>
+            <artifactId>jakarta.jakartaee-web-api</artifactId>
+            <version>10.0.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.xml.ws</groupId>
+            <artifactId>jakarta.xml.ws-api</artifactId>
+            <version>4.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.servlet.jsp.jstl</groupId>
+            <artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
+            <version>3.0.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish.web</groupId>
+            <artifactId>jakarta.servlet.jsp.jstl</artifactId>
+            <version>3.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>${project.artifactId}</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>3.4.0</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file

jakarta1/src/main/java/beans/PrzykladowyBean.java

+package beans;
+
+import java.util.Random;
+
+/* Klasa jest "Java Bean" jeśli:
+ * 1) posiada publiczny konstruktor bezargumentowy (tzw. "default constructor")
+ * 2) dostęp do własności ("properties") udostępniony poprzez gettery i settery (nie ma obowiązku aby zawsze była para)
+ * ... wzorzec Java Bean opisuje też technikę powiadamiania o zdarzeniach (korzysta się z tego przede wszystkim w GUI), ale w większości przypadków wystarczają te dwie powyższe cechy
+ */
+
+// konstruktor domyślny jest tworzony automatycznie
+
+public class PrzykladowyBean {
+    private String napis = "Ala ma kota";
+    private Random random = new Random();
+    private int liczba;
+    
+    public String getNapis() {
+        return napis;
+    }
+    
+    public String getNapisDuzymiLiterami() {
+        return napis.toUpperCase();
+    }
+    
+    public void setNapis(String napis) {
+        this.napis = napis;
+    }
+    
+    public String[] getWords() {
+        return napis.split(" ");
+    }
+    
+    public int wylosuj() {
+        return random.nextInt(1000);
+    }
+
+    @Override
+    public String toString() {
+        return "PrzykladowyBean z zawartością " + napis;
+    }
+}

jakarta1/src/main/java/org/example/jakarta1/HelloServlet.java

+package org.example.jakarta1;
+
+import java.io.*;
+
+import jakarta.servlet.http.*;
+import jakarta.servlet.annotation.*;
+
+@WebServlet(name = "helloServlet", value = "/hello-servlet")
+public class HelloServlet extends HttpServlet {
+    private String message;
+
+    public void init() {
+        message = "Hello World!";
+    }
+
+    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
+        response.setContentType("text/html");
+
+//        String name = request.getParameter("name");
+//        Cookie[] cookies = request.getCookies();
+//        HttpSession session = request.getSession();
+
+        // Hello
+        PrintWriter out = response.getWriter();
+        out.println("<html><body>");
+        out.println("<h1>" + message + "</h1>");
+        out.println("</body></html>");
+    }
+
+    public void destroy() {
+    }
+}
\ No newline at end of file

jakarta1/src/main/java/serwisy/AplikacjaRestowa.java

+package serwisy;
+
+import jakarta.ws.rs.ApplicationPath;
+import jakarta.ws.rs.core.Application;
+
+@ApplicationPath("/rest")
+public class AplikacjaRestowa extends Application {
+}

jakarta1/src/main/java/serwisy/HelloRest.java

+package serwisy;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+
+@Path("/hello")
+public class HelloRest {
+
+    @Produces(MediaType.TEXT_PLAIN)
+    @GET
+    public String sayHello() {
+        return "Hello World!";
+    }
+}

jakarta1/src/main/java/serwisy/Student.java

+package serwisy;
+
+import jakarta.xml.bind.annotation.*;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+// JAXB = Java (Jakarta?) Architecture for XML Binding
+@XmlRootElement
+@XmlAccessorType(XmlAccessType.FIELD)
+public class Student {
+    private String imie, nazwisko;
+    @XmlElementWrapper(name = "oceny")
+    @XmlElement(name = "ocena")
+    private final List<Integer> oceny = new ArrayList<>();
+
+    public Student() {
+        this("", "");
+    }
+
+    public Student(String imie, String nazwisko) {
+        this.imie = imie;
+        this.nazwisko = nazwisko;
+    }
+
+    public Student(String imie, String nazwisko, Collection<Integer> oceny) {
+        this.imie = imie;
+        this.nazwisko = nazwisko;
+        this.oceny.addAll(oceny);
+    }
+
+    public String getImie() {
+        return imie;
+    }
+
+    public void setImie(String imie) {
+        this.imie = imie;
+    }
+
+    public String getNazwisko() {
+        return nazwisko;
+    }
+
+    public void setNazwisko(String nazwisko) {
+        this.nazwisko = nazwisko;
+    }
+
+    public List<Integer> getOceny() {
+        return Collections.unmodifiableList(oceny);
+    }
+
+    public void setOceny(List<Integer> oceny) {
+        this.oceny.clear();
+        this.oceny.addAll(oceny);
+    }
+
+    public void dodajOcene(int ocena) {
+        this.oceny.add(ocena);
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "imie='" + imie + '\'' +
+                ", nazwisko='" + nazwisko + '\'' +
+                ", oceny=" + oceny +
+                '}';
+    }
+}

jakarta1/src/main/java/serwisy/StudentRest.java

+package serwisy;
+
+import jakarta.ws.rs.*;
+import jakarta.ws.rs.core.MediaType;
+
+import java.util.List;
+
+@Path("/student")
+public class StudentRest {
+
+    @Produces(MediaType.APPLICATION_JSON)
+    @GET
+    public Student getStudent() {
+        Student student = new Student("Jan", "Kowalski", List.of(4, 5, 4, 3));
+        return student;
+    }
+
+    @Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
+    @Produces(MediaType.TEXT_HTML)
+    @POST
+    public String postStudent(Student student) {
+        return "<html><body><h1>Dane studenta</h1>"
+                + "<p>Imię: " + student.getImie() + "</p>"
+                + "<p>Nazwisko: " + student.getNazwisko() + "</p>"
+                + "</body></html>";
+    }
+}

jakarta1/src/main/java/serwisy/StudentRestXml.java

+package serwisy;
+
+import jakarta.ws.rs.*;
+import jakarta.ws.rs.core.MediaType;
+
+import java.util.List;
+
+@Path("/student.xml")
+public class StudentRestXml {
+
+    @Produces(MediaType.APPLICATION_XML)
+    @GET
+    public Student getStudent() {
+        Student student = new Student("Jan", "Kowalski", List.of(4, 5, 4, 3));
+        return student;
+    }
+
+    @Consumes(MediaType.APPLICATION_XML)
+    @Produces(MediaType.TEXT_HTML)
+    @POST
+    public String postStudent(Student student) {
+        return "<html><body><h1>Dane studenta</h1>"
+                + "<p>Imię: " + student.getImie() + "</p>"
+                + "<p>Nazwisko: " + student.getNazwisko() + "</p>"
+                + "</body></html>";
+    }
+}

jakarta1/src/main/java/serwisy/Usluga.java

+package serwisy;
+
+import jakarta.jws.WebParam;
+import jakarta.jws.WebResult;
+import jakarta.jws.WebService;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+@WebService
+public class Usluga {
+
+    @WebResult(name="powitanie")
+    public String sayHello(@WebParam(name="imie") String imie) {
+        return "Hello " + imie + "!";
+    }
+
+    @WebResult(name="student")
+    public Student nowyStudent(
+            @WebParam(name="first-name") String imie,
+            @WebParam(name="last-name") String nazwisko,
+            @WebParam(name="cnt") int ileOcen) {
+        ThreadLocalRandom random = ThreadLocalRandom.current();
+        Student student = new Student(imie, nazwisko);
+        for(int i = 0; i < ileOcen; i++) {
+            student.dodajOcene(random.nextInt(2, 5));
+        }
+        return student;
+    }
+}

jakarta1/src/main/resources/META-INF/beans.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="https://jakarta.ee/xml/ns/jakartaee"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/beans_4_0.xsd">
+
+</beans>
\ No newline at end of file

jakarta1/src/main/resources/META-INF/persistence.xml

+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
+             version="3.0">
+    <persistence-unit name="default">
+
+    </persistence-unit>
+</persistence>

jakarta1/src/main/webapp/WEB-INF/web.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd"
+         version="6.0">
+</web-app>
\ No newline at end of file

jakarta1/src/main/webapp/index.jsp

+<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
+<!DOCTYPE html>
+<html>
+<head>
+    <title>JSP - Hello World</title>
+</head>
+<body>
+<h1><%= "Hello World!" %>
+</h1>
+<ul>
+<li><a href="hello-servlet">Hello Servlet</a></li>
+<li><a href="przyklad.jsp">przykład JSP</a></li>
+<li><a href="rest/hello">Hello REST</a></li>
+<li><a href="rest/student">Student REST</a> - wersja JSON</li>
+<li><a href="rest/student.xml">Student REST</a> - wersja XML</li>
+<li><a href="Usluga?wsdl">Usługa SOAP</a> - WSDL</li>
+</ul>
+</body>
+</html>
\ No newline at end of file

jakarta1/src/main/webapp/przyklad.jsp

+<%@page contentType="text/html;charset=UTF-8" language="java" %>
+<%@taglib prefix="c" uri="jakarta.tags.core" %>
+<html>
+<head>
+    <title>Title</title>
+</head>
+<body>
+<h1>Przykładowa strona JSP</h1>
+
+<p>Zwykła treść HTML.</p>
+<p>Wynik operacji Java: <%= java.time.LocalTime.now() %></p>
+<p>Wynik wyrażenia EL: ${2+3*4}</p>
+
+<form>
+    <label for="imie">Podaj imię:</label>
+    <input type="text" name="imie" id="imie">
+    <br>
+    <button>Wyślij</button>
+</form>
+
+<h3>Skryptlety - różne wersje</h3>
+<!-- To jest komentarz HTML - on będzie wysłany do klienta -->
+<%-- To jest komentarz w JSP. Klient tego nie zobaczy --%>
+
+<%-- Fragmenty HTML i zwykłego tekstu pisane w JSP są wysyłane w odpowiedzi do klienta.
+    Ale w plikach JSP można też umieszczać fragmenty kodu Java wewnątrz tzw. scriptlets. --%>
+<p>Zaraz wykonam kod Javy:</p>
+<%
+    out.println("Hej, tu Java wewnątrz JSP");
+    System.out.println("a kuku");
+    int x = 321;
+    String[] imiona = {"Ala", "Ola", "Ela"};
+%>
+<p>Znowu tryb HTML</p>
+
+<%-- brzydki styl, ale działa: --%>
+<ul>
+    <% for(String imie : imiona) { %>
+        <li><%= imie%></li>
+    <% } %>
+</ul>
+
+<%-- Istnieją specjalne wersje skryptletów.
+   Powyżej widzielismy zwykły blok kodu.
+   Poniżej zobaczymy wstawienie wartości do outputu: --%>
+<p>Wypisanie wyniku: <%= 2*x %></p>
+<p>Odczyt czasu: <%= java.time.LocalTime.now() %></p>
+<p>Prametr imie: <%= request.getParameter("imie") %></p>
+
+<%!
+    static int licznik = 100;
+    String dajGlos() {
+        return "hau hau";
+    }
+%>
+<p>Licznik: <%= licznik++ %></p>
+<p>Metoda: <%= dajGlos() %></p>
+
+<%-- Plik JSP jest na serwerze tłumaczony na klasę serwletu i kompilowany. --%>
+
+<h2>Inne sposoby</h2>
+<p>Mądrzejszy sposób korzystania z JSP łączy takie trzy techniki:</p>
+<ol>
+    <li><strong>Expression Language (EL)</strong> - wyrażenia wpisywane w znacznikach <code>$ { }</code>,
+    <li><strong>beans</strong> - obiekty przygotowane po stronie aplikacji lub w samym skrypcie JSP, do których JSP ma dostęp,
+    <li><strong>taglibs</strong> - biblioteki dodatkowych tagów, które działają jak polecenia, chociaż są pisane jak tagi HTML.
+</ol>
+
+
+<h3>EL</h3>
+<%-- proste wyrażenie EL --%>
+<p>Wynik obliczenia: ${2 + 3 * 4}</p>
+<p>Parametr imie: <strong>${param.imie}</strong></p>
+
+<jsp:useBean id="obiekt" class="beans.PrzykladowyBean"/>
+
+<p>Obiekt beanowy: ${obiekt}</p>
+<p>Napis: ${obiekt.napis}</p>
+<p>Napis DL: ${obiekt.napisDuzymiLiterami}</p>
+<%-- <p>Napis: ${obiekt.liczba}</p> -->
+
+<%-- Można wywoływać metody o nazwach niezgodnych z konwencją getterów: --%>
+<p>Wywołanie metody: ${obiekt.wylosuj()}</p>
+
+<jsp:setProperty property="napis" name="obiekt" value="Ola ma psa"/>
+<p>Napis po zmianie: ${obiekt.napis}</p>
+<p>Duże litery: ${obiekt.napisDuzymiLiterami}</p>
+<%-- Gdy wpisujemy odwołanie do obiektu, to jest on printowany za pomocą toString().
+    Gdy wpiszemy coś, co wygląda na odczyt pola obiektu, to jest wywoływany getter zwracający to property,
+    np. osoba.wiek powoduje wywołanie getWiek()
+    Gdy wpiszemy coś z nawiasami na końcu, to jest to wywołanie metody.
+    Polecenie setProperty skutkuje wywołaniem settera, np. setNapis(...)
+--%>
+
+<%-- Biblioteka tagów ("taglib") to jest zestaw poleceń zapisywanych w formie znaczników w obrębie JSP.
+Te znaczniki zawsze są poprzedzane prefiksem, np. <c:if>....
+
+Tagliby można definiować samodzielnie, ale w 98% przypadków używa się zestawu nazywanego JSTL
+"Java Standard Tag Library"
+--%>
+<h3>Taglibs</h3>
+<ul>
+    <c:forEach var="i" items="5,10,15">
+        <li>${i}
+            <c:choose>
+                <c:when test="${i % 2 == 0}">parzyste</c:when>
+                <c:otherwise>nieparzyste</c:otherwise>
+            </c:choose>
+        </li>
+    </c:forEach>
+</ul>
+
+<p>Słowa napisu:</p>
+<ul>
+    <c:forEach var="word" items="${obiekt.words}">
+        <li>${word}</li>
+    </c:forEach>
+</ul>
+
+</body>
+</html>