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BAEL-305: Runnable demo application

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This commit is contained in:
Christian Raedel 2016-08-31 03:18:02 +02:00
parent 442d9916fd
commit 9c5404ead8
13 changed files with 282 additions and 0 deletions
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41
enterprise-patterns/front-controller-pattern/pom.xml Normal file
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>front-controller-pattern</artifactId>
<packaging>war</packaging>
<parent>
<artifactId>enterprise-patterns-parent</artifactId>
<groupId>com.baeldung.enterprise.patterns</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<outputDirectory>${env.DEPLOYMENTS}</outputDirectory>
</configuration>
</plugin>
</plugins>
</build>
</project>

45
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/FrontControllerServlet.java Normal file
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package com.baeldung.enterprise.patterns.front.controller;
import com.baeldung.enterprise.patterns.front.controller.commands.FrontCommand;
import com.baeldung.enterprise.patterns.front.controller.commands.UnknownCommand;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class FrontControllerServlet extends HttpServlet {
@Override
protected void doGet(
HttpServletRequest request,
HttpServletResponse response
) throws ServletException, IOException {
FrontCommand command = getCommand(request);
command.init(getServletContext(), request, response);
command.process();
}
private FrontCommand getCommand(HttpServletRequest request) {
try {
return (FrontCommand) getCommandClass(request)
.asSubclass(FrontCommand.class)
.newInstance();
} catch (Exception e) {
throw new RuntimeException("Failed to get command!", e);
}
}
private Class getCommandClass(HttpServletRequest request) {
try {
return Class.forName(
String.format(
"com.baeldung.enterprise.patterns.front.controller.commands.%sCommand",
request.getParameter("command")
)
);
} catch (ClassNotFoundException e) {
return UnknownCommand.class;
}
}
}

22
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/BookCommand.java Normal file
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package com.baeldung.enterprise.patterns.front.controller.commands;
import com.baeldung.enterprise.patterns.front.controller.data.Book;
import com.baeldung.enterprise.patterns.front.controller.data.Bookshelf;
import javax.servlet.ServletException;
import java.io.IOException;
public class BookCommand extends FrontCommand {
@Override
public void process() throws ServletException, IOException {
Book book = Bookshelf.getInstance()
.findByTitle(request.getParameter("title"));
if (book != null) {
request.setAttribute("book", book);
forward("book-found");
} else {
request.setAttribute("books", Bookshelf.getInstance().getBooks());
forward("book-notfound");
}
}
}

32
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/FrontCommand.java Normal file
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package com.baeldung.enterprise.patterns.front.controller.commands;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public abstract class FrontCommand {
protected ServletContext context;
protected HttpServletRequest request;
protected HttpServletResponse response;
public void init(
ServletContext servletContext,
HttpServletRequest servletRequest,
HttpServletResponse servletResponse
) {
this.context = servletContext;
this.request = servletRequest;
this.response = servletResponse;
}
public abstract void process() throws ServletException, IOException;
protected void forward(String target) throws ServletException, IOException {
target = String.format("/WEB-INF/jsp/%s.jsp", target);
RequestDispatcher dispatcher = context.getRequestDispatcher(target);
dispatcher.forward(request, response);
}
}

11
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/UnknownCommand.java Normal file
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package com.baeldung.enterprise.patterns.front.controller.commands;
import javax.servlet.ServletException;
import java.io.IOException;
public class UnknownCommand extends FrontCommand {
@Override
public void process() throws ServletException, IOException {
forward("unknown");
}
}

40
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/data/Book.java Normal file
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package com.baeldung.enterprise.patterns.front.controller.data;
public class Book {
private String author;
private String title;
private Double price;
public Book() {
}
public Book(String author, String title, Double price) {
this.author = author;
this.title = title;
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
}

32
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/data/Bookshelf.java Normal file
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package com.baeldung.enterprise.patterns.front.controller.data;
import java.util.ArrayList;
import java.util.List;
public class Bookshelf {
private static Bookshelf INSTANCE = new Bookshelf();
private List<Book> books = new ArrayList<>();
public static Bookshelf getInstance() {
if (INSTANCE.books.size() == 0) {
INSTANCE.init();
}
return INSTANCE;
}
private void init() {
books.add(new Book("Wilson, Robert Anton & Shea, Robert", "Illuminati", 9.99));
books.add(new Book("Fowler, Martin", "Patterns of Enterprise Application Architecture", 27.88));
}
public Book findByTitle(String title) {
return books.stream()
.filter(book -> book.getTitle().equalsIgnoreCase(title))
.findFirst()
.orElse(null);
}
public List<Book> getBooks() {
return books;
}
}

6
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jboss-web.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss-web PUBLIC "-//JBoss//DTD Web Application 5.0//EN"
"http://www.jboss.org/j2ee/dtd/jboss-web_5_0.dtd">
<jboss-web>
<context-root>/front-controller/</context-root>
</jboss-web>

4
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/book-found.jsp Normal file
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<p>Our Bookshelf contains this title:</p>
<h2>${book.getTitle()}</h2>
<p>Author: ${book.getAuthor()}</p>
<input type="submit" value="Buy it: ${book.getPrice()}$">

2
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/book-notfound.jsp Normal file
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<p>Our Bookshelf doesn't contains this title:</p>
<h2>${param.get("title")}</h2>

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enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/unknown.jsp Normal file
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<p>Sorry, this command is not known!</p>

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enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/web.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
<servlet>
<servlet-name>front-controller</servlet-name>
<servlet-class>com.baeldung.enterprise.patterns.front.controller.FrontControllerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>front-controller</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

35
enterprise-patterns/pom.xml Normal file
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.enterprise.patterns</groupId>
<artifactId>enterprise-patterns-parent</artifactId>
<packaging>pom</packaging>
<modules>
<module>front-controller-pattern</module>
</modules>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>