Ivan Krizsan的Spring 5认证详解

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"《CoreSpring5认证详解》是一本由Ivan Krizsan编写的关于Spring框架5.0版本认证的专业指南。该书于2019年11月29日更新，详细涵盖了Spring框架的核心概念和技术，旨在帮助读者准备Spring认证考试。作者保留了所有版权，未经许可，任何形式的复制、分发或传输都必须得到出版商的书面同意，除非在学术评论中的短引用或其他非商业用途下符合版权法的规定。本书特别指出，部分章节的内容是专为计算机系统输入和执行设计的，仅供购买该作品的用户专享。书中可能包含商标名称、标志和图像，这些名称仅以编辑性方式提及，以保护商标所有者的权益，无意侵犯其商标权。尽管作者在编写时力求信息的准确性和时效性，但书中并不承担因信息过时导致的法律责任。本书涵盖了Spring 5.0的核心知识点，包括依赖注入（Dependency Injection）、面向切面编程（Aspect-Oriented Programming）、Spring MVC、AOP、事务管理、Spring Boot等，以及如何配置和管理Spring应用程序。此外，还可能涉及Spring Security、WebSocket支持、微服务架构等相关主题。通过阅读和理解这些内容，读者不仅能够掌握Spring框架的基础，还能深入理解其在现代软件开发中的应用策略。对于准备Spring认证考试的考生来说，这本书是宝贵的参考资料，提供了丰富的实践案例和解答，有助于理解和巩固理论知识，提高应对实际考试的能力。同时，对于已经在Spring环境中工作的开发者，这本指南也能作为提升技能和深化理解的重要工具。"

Core Spring 5 Certification in Detail by Ivan Krizsan

• XmlWebApplicationContext

Web application context used with XML configuration.

References:

• Spring 5 Reference: Introduction to the Spring IoC Container and Beans

• Spring 5 Reference: Container Overview

• Spring 5 Reference: Additional Capabilities of the ApplicationContext

• Spring 5 API: ApplicationContext

Core Spring 5 Certification in Detail by Ivan Krizsan

How are you going to create a new instance of an

ApplicationContext?

The way to create an application context differs depending on the type of application context that is

to be created. Below follows examples for some common types of application contexts.

An application context implementation is chosen depending on what type of configuration is more

commonly used. It is possible to mix the two types of configuration.

Non-Web Applications

For non-web applications, creating an application context only involves creating a new instance of

the appropriate class implementing the ApplicationContext interface.

AnnotationConfigApplicationContext

This type of application context is used with standalone applications that uses Java configuration,

that is classes annotated with @Configuration.

There are four constructors in AnnotationConfigApplicationContext with these signatures:

/* Creates an empty application context. */

public AnnotationConfigApplicationContext()

* Creates an application context that uses the supplied bean factory.

* Whether the application context is empty depends on the supplied bean factory.

public AnnotationConfigApplicationContext(DefaultListableBeanFactory beanFactory)

* Creates an application context populated with the beans from the supplied

* classes annotated with @Configuration.

public AnnotationConfigApplicationContext(Class<?>... annotatedClasses)

* Creates an application context populated with the beans from the

* classes annotated with @Configuration found in the supplied package and its

* sub-packages.

public AnnotationConfigApplicationContext(String... basePackages)

This example shows how to create an instance of this application context that will be populated with

the beans from a Java class annotated with the @Configuration annotation:

AnnotationConfigApplicationContext theApplicationContext =

new AnnotationConfigApplicationContext(MyConfiguration.class);

This example shows how to create and instance of this application context that will be populated

with the beans from all Java classes annotated with the @Configuration annotation in a certain

package, including configuration found in any sub-packages:

AnnotationConfigApplicationContext theParentApplicationContext =

new AnnotationConfigApplicationContext(

"se.ivankrizsan.spring.examples.configuration");

Core Spring 5 Certification in Detail by Ivan Krizsan

• AbstractAnnotationConfigDispatcherServletInitializer

Abstract base class that registers a DispatcherServlet in the servlet context and uses Java-

based Spring configuration.

• AbstractReactiveWebInitializer

Creates a Spring application context that uses Java-based Spring configuration. Creates a

Spring reactive web application in the servlet container.

Servlet 3 – XmlWebApplicationContext

As with non-web application the Spring application context can be configured using either XML

configuration file(s) or Java configuration (class(es) annotated with the @Configuration

annotation).

XmlWebApplicationContext has one single constructor that takes no parameters. The following

example shows how a WebApplicationInitializer that creates and configures an instance of

XmlWebApplicationContext that in turn reads Spring bean configuration from an XML file.

public class MyXmlWebApplicationInitializer implements WebApplicationInitializer {

@Override

public void onStartup(final ServletContext inServletContext) {

/* Create Spring web application context using XML configuration. */

final XmlWebApplicationContext theXmlWebApplicationContext =

new XmlWebApplicationContext();

theXmlWebApplicationContext

.setConfigLocation("/WEB-INF/applicationContext.xml");

theXmlWebApplicationContext.setServletContext(inServletContext);

theXmlWebApplicationContext.refresh();

theXmlWebApplicationContext.start();

* Create and register the DispatcherServlet.

* This is not strictly necessary if the application does not need

* to receive web requests.

final DispatcherServlet theDispatcherServlet =

new DispatcherServlet(theXmlWebApplicationContext);

ServletRegistration.Dynamic theServletRegistration =

inServletContext.addServlet("app", theDispatcherServlet);

theServletRegistration.setLoadOnStartup(1);

theServletRegistration.addMapping("/app/*");

}

Note that a servlet context must be set on the web application context.

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