Spring enterprise recipes pdf

 
    Contents
  1. Long J., Mak G. Spring Enterprise Recipes: A Problem-Solution Approach
  2. Long J., Mak G. Spring Enterprise Recipes: A Problem-Solution Approach
  3. Spring Boot Cookbook - Second Edition
  4. Spring Recipes: A Problem-Solution Approach, Third Edition

Framework 3. Learn to use the full power of Spring 3 through coding recipes! . □Chapter Spring in the Enterprise. Creating Excel and PDF Views. The Spring framework is a widely adopted enterprise and general Java framework. Written by Gary Mak, author of the bestseller Spring Recipes, and Josh Long, DRM-free; Included format: PDF; ebooks can be used on all reading devices. Master reactive Spring, functional web framework, and microservices. ▷ Use Spring Batch Other recipes include Spring enterprise solutions for topics such as.

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Spring Enterprise Recipes Pdf

Spring Recipes: A Problem-Solution Approach, 2nd Edtion Publisher: Apress; 2nd edition (September 1, ); Paperback pages; eBook PDF, has been a technical architect and application developer on the enterprise Java. 10 items Covers Spring Framework 3. Enterprise Recipes A Problem-Solution Approach Learn to build robust enterprise-tier applications and architectures using. Enterprise; Explore ProgrammingBooks/[Daniel Rubio,Josh Long,Gary Mak, Marten Deinum ]Spring Recipes A Problem-Solution Approach(pdf){Zzzzz}.pdf.

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On the other hand, if the auto-wiring mode is set to byName or byType, and Spring cannot find a matching bean to wire, it will leave the property unset, which may cause a NullPointerException or a value that has not been initialized. However, if you want to be notified when auto-wiring cannot wire your beans, you should set the dependency-check attribute to objects or all.

Auto-Wiring Beans with Autowired and Resource Problem Auto-wiring by setting the autowire attribute in the bean configuration file will wire all properties of a bean. Moreover, you can auto-wire beans only either by type or by name. If neither strategy satisfies your requirements, you must wire your beans explicitly. Solution Spring 2. You can auto-wire a particular property by annotating a setter method, a constructor, a field, or even an arbitrary method with the Autowired annotation or the Resource annotation defined in JSR Common Annotations for the Java Platform.

That means you have one more option besides setting the autowire attribute to satisfy your requirements. However, this annotation-based option requires you to be using Java 1. If you are using a bean factory, you have to register this bean post processor through the API.

Otherwise, you can just declare an instance of it in your application context. Or you can simply include the element in your bean configuration file, and an AutowiredAnnotationBeanPostProcessor instance will automatically get registered. As an example, you can annotate the setter method of the prefixGenerator property with Autowired. By default, all the properties with Autowired are required.

If you want a certain property to be optional, set the required attribute of Autowired to false. Then Spring will attempt to find a bean with the compatible type for each of the constructor arguments.

In this way, you can omit the need of declaring a setter method or a constructor for this field. Spring will inject the matched bean into this field via reflection. Then Spring will attempt to wire a bean with the compatible type for each of the method arguments. For example, you can annotate a PrefixGenerator[] property with Autowired.

Then Spring will auto-wire all the beans whose type is compatible with PrefixGenerator at one time. In a similar way, you can apply the Autowired annotation to a type-safe collection. Spring can read the type information of this collection and auto-wire all the beans whose type is compatible. Map with strings as the keys, it will add all the beans of the compatible type, with the bean names as the keys, to this map. However, Spring allows you to specify a candidate bean by providing its name in the Qualifier annotation.

Autowired; import org. The Qualifier annotation can also be applied to a method argument for auto-wiring. This annotation type must be annotated with Qualifier itself. This is useful if you want a specific type of bean and configuration injected wherever an annotation decorates a field or setter method.

Target; import java. Retention; import java. ElementType; import java. RetentionPolicy;import org. Qualifier; 21 Download at WoweBook. It will ask Spring to auto-wire the bean with this qualifier annotation and the specified value.

The qualifier is added by the element with the type attribute.

Long J., Mak G. Spring Enterprise Recipes: A Problem-Solution Approach

The qualifier value is specified in the value attribute. The value attribute is mapped to the String value attribute of the annotation. Auto-Wiring by Name If you want to auto-wire bean properties by name, you can annotate a setter method, a constructor, or a field with the JSR Resource annotation.

By default, Spring will attempt to find a bean with the same name as this property. But you can specify the bean name explicitly in its name attribute. Scanning Components from the Classpath Problem In order for the Spring IoC container to manage your components, you declare them one by one in the bean configuration file.

However, it can save you a lot of work if Spring can automatically detect your components without manual configuration. Solution Spring provides a powerful feature called component scanning. It can automatically scan, detect, and instantiate your components with particular stereotype annotations from the classpath.

The basic annotation denoting a Spring-managed component is Component. Other more particular stereotypes include Repository, Service, and Controller. They denote components in the persistence, service, and presentation layers, respectively. How It Works Suppose you are asked to develop your sequence generator application using database sequences, and store the prefix and suffix of each sequence in a table. First, you create the domain class Sequence containing the id, prefix, and suffix properties.

The getSequence method loads a Sequence object from the table by its ID, while the getNextValue method retrieves the next value of a particular database sequence.

Internally, this service object will interact with the DAO to handle the sequence generation requests. So it requires a reference to the DAO.

You can auto-wire your components to reduce the amount of configurations. Then you can test the preceding components with the following Main class: package com. ApplicationContext; import org. By default, Spring can detect all components with a stereotype annotation. The basic annotation type that denotes a Spring-managed component is Component.

JSTL 1. It really eases life of Java developers by providing tons of features. Apache Tomcat 8. Maven-archetype-webapp only create minimum number of files and directories required to run the web application in a Servlet Container.

It is added by webapp archetype by default. We only change its version to a newer value. Figure 5. Service and DAO Classes 5. Repository annotation causes a singleton scope bean to be created in Spring Container. Person findById Long id. Service annotation causes a singleton scope bean to be created in Spring Container. We create a separate Controller class and a corresponding JSP file for each persistence operation that will be available to our users.

Before creating following JSP file. RequestMapping annotation over the meth- ods maps methods with request URIs to be handled by those controller beans. Autowire annotation injects a service bean of type PersonService available in the container. Person id: ComponentScan annotation causes Spring to scan base packages given as attribute value.

EnableTransactionManagement annotation enables annotation based declarative transaction support in the container. Repository and Component on top of them. Following page will be displayed listing persons in the application. Starting ProtocolHandler [http-nio] Nov Launch your favourite browser and type https: Starting ProtocolHandler [ajp-nio] Nov After several hunderd lines of log output. Catalina start INFO: Server startup in ms This indicates that your webapp has been deployed into the server successfully and is available.

After creation of necessary classes. The source directory of the project should be as below. On the other hand. Spring is designed to be non-intrusive. We show here how to integrate the spring easily with Angularjs in presentation layer.

Long J., Mak G. Spring Enterprise Recipes: A Problem-Solution Approach

The server side can serve content. Angularjs becomes popular for the single page applications in the client side. AngularJS is a structural framework for dynamic web apps. And it all happens within the browser. In this tutorial. Spring has been always one of the popular server sides framework in java world. The project developed based on jdk 1. Every application requires a server side backend framework besides the client side frontend framework. Spring is modular and allows you to use only those parts that you need.

The Spring Framework is a lightweight solution for enterprise applications. WebJars is simply taking the concept of a JAR and applying it to client-side libraries or resources. A complete list is available at webjars. Most JavaScript developers are likely familiar with npm and bower and make use of those in their projects.

In fact. JavaScript package management is not a new concept. Web application directory 6. It is as opposed to the mvc-dispatcher. To configure the resources and viewResolver. Here is the equivalent DispatcherServlet registration logic in form of a java class. As we configure the web app in java file in this tutorial. Another plugin that is used is tomcat7-mabven-plugin. To use ngRoute and inject it into our application. We use angular. Every time the current route changes.. To handle a request to e.

A scope can be seen as the glue which allows the template. Any changes made to the model are reflected in the view. AngularJS comes with a dependency injection container built in to it.

To do so. Unit Angular uses scopes. The concept of a scope in Angular is crucial. Angularjs and Spring integration tutorial.

Angularjs and Spring integration web app 6. Figure 6. Open Eclipse and create a simple Maven project and check the skip archetype selection checkbox on the dialogue box that appears. Replace the content of the existing pom. We shall leave out Encryption as it is beyond the scope of this write-up. In this example we will demonstrate how we can implement Spring-Security to secure our web-application. If the user enters his username as XYZ. Spring Security provides authentication and authorization in a very flexible manner and is also easy to configure and interpret.

We can now start with the actual Spring-Security implementation. We need to declare the SpringSecurityFilterC hain. Session Fixation. This filter guards the web-application from a host of malicious attacks like CSRF. The DelegatingF ilterProxy is a proxy for actual spring bean object which implements the javax. XSS etc. We pass the location of spring security config file. Filter interface. Javascript and CSS files. Authentication object. Not doing so may lead to infinite redirects to the same login page.

Spring extracts the username and password from the request using the names provided and provides them in the org. The sec: It acts as a container for all HTTP-related security settings.

The username-parameter and password-parameter are the names of the username and the password fields that the login page has. If we do not provide a login form. The user may also use hasRole expression to authenticate based in the user-roles. It is wise to rename to hide underlying technology. This specifies the roles authorized to access the resource mapped by this filter-pattern. The login-processing-url is the actual url which holds the resource to authenticate the user. We will look in to this class in detail in the next section.

The user may also choose to waive authentication process for certain resources from all security check like the login page. The developer may define multiple sec: If the role matches the access rights for the user is allowed to access the resource. UsernamePassword AuthenticationToken authentication object. The interface provides us with simple method which will help simplify the process of user- authentication for us. In this example we have implemented the org.

Authentic ationProvider interface.

This object contains the username and password the user entered in the login page. Upon successful authentication the users roles are populated in a new org.

If not. This method takes the authentication request object as a pa- rameter. Remember to pass this xml file-name in the init- param of the DispatcherServlet in web. Once the user is successfully authenticated and authorized. The resource requested by the user is then checked against the role in this authentication object.

There is also a hidden field which stores a random token to be submitted with the request. This helps to guard against the https: Login Page Upon successful authentication.

Your login was successful. If the user is authenticated but his role does not allow him to access the resource.. Figure 7. Welcome Page In case the user enters wrong password he is redirected back to the login page with the message that is thrown from the Custo mAuthenticationProvider authenticate method..

Access Denied 7. Download You can download the source code of this example here: View and Con- troller.

MVC framework provides separa- tion between input logic. Spring MVC framework comprised of three logical sections of Model. Spring provides MVC framework with ready components that can be used to develop flexible and loosely coupled web applications.

For this example. DispatcherServlet will send the model data to display rendered page in browser 8. We will have few options to show the database data on webpage. Our model for this example will be based on Employee and Company.

In eclipse. Dynamic Web Project. This is required for Maven project. This is how the final pom. This will create a POM dependencies xml file in the project. You can delete the WebContent folder. We will update pom. Select the default option of WAR for packaging. Directory Structure On next screen.

The code will look like below HibernateConfiguration. Along with creating entity class. This file will be application. This is the object we will use to modify through our sample web application.

Driver jdbc. Controller of MVC invokes this layer. This layer will provide a cohesive and high-level logic to application. List findAllEmployees. String ssn. That we will see in next section. Service objects invoke this layer. This is a generic base class for DAO implementation. For our application. Employee findEmployeeBySsn String ssn. We will also be adding ways to handle our error messages through messages.

Please fill in different value. This is a Spring based controller with annotation based handling of requests.

DispatcherServlet will handle our request. Autowired MessageSource messageSource. BindingResult result. ModelMap model. We will need a registration page. Inside views. If you face the error saying can not find symbol: You might run into the below error Figure 8. Now we can go to browser and access our web application.

Listing of all employees. Now access the webapplication https: This will start our webserver. Add new employee 8. When using the said class the user has to only provide the URL. The RestTemplate inherits from the Restoperations interface and as such. So the RestTemplate will ignore the rest of the properties that are not present in the PoJo we defined above. Please note that as with other the RestTemplate class assumes that we follow the Bean convention of getters and setters for all the properties in the PoJo.

This will be ignored "title": UserBean in this case. WARN Please initialize the log4j system properly. The object received from REST call: In a development environment.

GET method. This will help build a loosely coupled application. Closing the connection tunnel etc. WARN No appenders could be found for logger org. Class responseType Class responseType. Object request. We shall use the MySQL database for this demo.

The benefits of using Spring Data is that it removes a lot of boiler-plate code and provides a cleaner and more readable imple- mentation of DAO layer. We create a table "employee" with 2 columns as shown: Project Structure.

Figure We map the properties of the Employee class with the columns of the employee table and the entity with employee table itself using the Table annotation.

The Person class will be the entity that we will store and retrieve from the database using the JPA. The toString method is over-ridden so that we get a meaningful output when we print the instance of the class. First of all. The container creates a single Physical Transaction in the Database and multiple Logical transactions for each nested method. The class implements the save and findbyPk methods which save and fetch the data using the instance of EntityManager injected.

The PersistenceContext annotation tells the container to inject an instance of entitymanager in the DAO. One of the other options is Propagation.

We then mention the class whose instances are to be used Persisted. Now we define our persistence Unit in the Persistence. There are other options which help in having a fine control over the transaction management. Transactional asks the container to provide a transaction to use the methods of this class. Now that we have completed all the hard-work. The datasource contains the basic configuration prop- erties like URL. The properties are provided like the datasource. The SpringDataDemo class extracts the EmployeeDaoImpl and attempts to save an instance of Employee to the em- ployee table and retrieve the same instance from the database.

This is when Spring Batch comes to the rescue. At the outset. But before we begin. A https: Feel free to jump to any section of choice. Now we want this processing. As always. Now performing this one activity involves several smaller activities.

Now the question is when would one use batch processing? To answer that. Key Concepts The following section skims through the key concepts of the framework. So a Job ba- sically holds all these logically related bunch of activities that identify a flow or a sequence of actions.

Think of a Job as an activity. And it does its bit in a pretty nice and efficient way as we will see in this example.

Spring Boot Cookbook - Second Edition

And guess what? It is open-source. Of course.

But before we get our hands dirty. The article is organized as listed below. Each Step comprises three elements: It takes a default value of true. Spring Batch Step. As the name suggests. Observe how an order of execution of the Steps can be specified using the attribute next It is scoped over all the Steps in the Job. By default. In other words all the details needed to do the actual batch processing are encapsulated in Steps. It receives a batch or chunk of data that is to be written out either to a file or a database.

Now coming to the processing of Steps. So a bunch of different ItemWriters are exposed by the framework as listed in this Appendix. It is a very simple interface that simply allows passing it an object and transforming it to another with the application of the desired business logic. That is. It can retrieve the input from different sources and there are different implementations floated by the framework as listed in the https: Unlike the ItemReader and ItemWriter.

The size of the chunk is specified by the commit-interval attribute as shown in the snippet below. The input sources are broadly categorized as follows: Once it does.

So much for what comprises Steps. Chunk-Oriented Processing The following code snippet shows how to configure a TaskletStep. And once the operation gets done. Simple enough! Chunk-Processing and Tasklet-Processing. And we will use the in-memory database HSQL.

Final Project Structure Note that Spring-Batch internally imports Spring-core etc. These jars are available with the example code for download. Browser Output This is what will be executed from our tasklet code. On second thoughts. We will configure the job that reads data from a CSV file into a database table and then calls the tasklet in job-config. Next, we will set up the context. For example, Add a properties file spring. Now we are all set to fire the execution. In the Main. Job; import org.

JobExecution; import org. JobParameters; import org. JobLauncher; import org. ApplicationContext; import org. London] Jun 8. Executing step: As promised. Jun 8. Why do I need it? How different is it to the other features under the same Spring umbrella?

I am sure you would have had similar inquisitions too. In short, Spring Boot takes care of application infrastructure while you can focus on coding the actual business flesh. Surely fast tracks building of applications.

Spring Recipes: A Problem-Solution Approach, Third Edition

It makes reasonable assumptions of the dependencies and adds them accordingly. It also lets you customize the dependencies according to your requirement. In the following sections, I am going to site a sample application example using Spring Boot. This tutorial assumes that you have basic understanding of Gradle build framework and also that your Eclipse IDE Luna environment is fully setup and configured with:.

Welcome Page Enter the name of your project. Create Gradle Project. Gradle Wrapper Press finish on the preview screen. Finish Screen You have successfully created the Gradle project. The following is the project structure of your Gradle project. Modify the file as shown below. Gradle Project Structure When build using the tasks from the ecli pse plugin.

In our example. Follow the link Spring Boot Gradle plugin to dig further about this plugin. Any binary plugins that have been published as external jars can be added to the project by adding them to the classpath configuration and then applying the plugin.

And apply plugin: When the project is built with gradle clean build, the jar file with name sample

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