iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

BAEL-305 - front controller pattern source

This commit is contained in:
slavisa-baeldung 2016-09-05 06:09:37 +02:00
parent 4c561c3e2e
commit 3d7ccfd56d
14 changed files with 314 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
enterprise-patterns/front-controller-pattern/pom.xml Normal file
View File

@ -0,0 +1,43 @@
<?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>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.0.M1</version>
<configuration>
<webApp>
<contextPath>/front-controller</contextPath>
</webApp>
</configuration>
</plugin>
</plugins>
</build>
</project>

45
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/FrontControllerServlet.java Normal file
View File

@ -0,0 +1,45 @@
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;
}
}
}

32
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/FrontCommand.java Normal file
View File

@ -0,0 +1,32 @@
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);
}
}

21
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/SearchCommand.java Normal file
View File

@ -0,0 +1,21 @@
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.BookshelfImpl;
import javax.servlet.ServletException;
import java.io.IOException;
public class SearchCommand extends FrontCommand {
@Override
public void process() throws ServletException, IOException {
Book book = new BookshelfImpl().getInstance()
.findByTitle(request.getParameter("title"));
if (book != null) {
request.setAttribute("book", book);
forward("book-found");
} else {
forward("book-notfound");
}
}
}

11
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/commands/UnknownCommand.java Normal file
View File

@ -0,0 +1,11 @@
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
View File

@ -0,0 +1,40 @@
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;
}
}

15
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/data/Bookshelf.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.enterprise.patterns.front.controller.data;
public interface Bookshelf {
default void init() {
add(new Book("Wilson, Robert Anton & Shea, Robert", "Illuminati", 9.99));
add(new Book("Fowler, Martin", "Patterns of Enterprise Application Architecture", 27.88));
}
Bookshelf getInstance();
<E extends Book> boolean add(E book);
Book findByTitle(String title);
}

24
enterprise-patterns/front-controller-pattern/src/main/java/com/baeldung/enterprise/patterns/front/controller/data/BookshelfImpl.java Normal file
View File

@ -0,0 +1,24 @@
package com.baeldung.enterprise.patterns.front.controller.data;
import java.util.ArrayList;
public class BookshelfImpl extends ArrayList<Book> implements Bookshelf {
private static Bookshelf INSTANCE;
@Override
public Bookshelf getInstance() {
if (INSTANCE == null) {
INSTANCE = new BookshelfImpl();
INSTANCE.init();
}
return INSTANCE;
}
@Override
public Book findByTitle(String title) {
return this.stream()
.filter(book -> book.getTitle().toLowerCase().contains(title.toLowerCase()))
.findFirst()
.orElse(null);
}
}

12
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/book-found.jsp Normal file
View File

@ -0,0 +1,12 @@
<!DOCTYPE html>
<html>
<head>
<title>Bookshelf: Title found</title>
</head>
<body>
<p>Our Bookshelf contains this title:</p>
<h2>${book.getTitle()}</h2>
<p>Author: ${book.getAuthor()}</p>
<input type="submit" value="Buy it: ${book.getPrice()}$">
</body>
</html>

10
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/book-notfound.jsp Normal file
View File

@ -0,0 +1,10 @@
<!DOCTYPE html>
<html>
<head>
<title>Bookshelf: Title not found</title>
</head>
<body>
<p>Our Bookshelf doesn't contains this title:</p>
<h2>${param.get("title")}</h2>
</body>
</html>

9
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/jsp/unknown.jsp Normal file
View File

@ -0,0 +1,9 @@
<!DOCTYPE html>
<html>
<head>
<title>Bookshelf: Command unknown</title>
</head>
<body>
<p>Sorry, this command is not known!</p>
</body>
</html>

15
enterprise-patterns/front-controller-pattern/src/main/webapp/WEB-INF/web.xml Normal file
View File

@ -0,0 +1,15 @@
<?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_3_1.xsd"
version="3.1">
<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
View File

@ -0,0 +1,35 @@
<?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>

2
pom.xml
View File

@ -29,6 +29,8 @@
<module>dozer</module>
<module>dependency-injection</module>
<module>deltaspike</module>
<module>enterprise-patterns</module>
<!-- <module>gatling</module> --> <!-- not meant to run as part of the standard build -->
<module>gson</module>