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The WebApplicationContext does not expand dramatically on the contract offered by the ApplicationContext interface, but in a web application you will often have a 1:1 relationship between WebApplicationContext instances and the servlet that is servicing a particular web request. The hierarchical capabilities of the web application context (inherited via ApplicationContext from HierarchicalBeanFactory) are used to good effect here to give the individual WebApplicationContext instances access to the parent ApplicationContext instance associated with the application as a whole, but not with any of their siblings. This approach makes the configuration information more modular with cleaner separation of concerns. You will see the application of this in 6, where a DispatcherServlet implementation initializes a WebApplicationContext instance and forwards all its incoming web requests to beans defined in the WebApplicationContext s configuration file. These beans in turn are injected with dependencies obtained from the parent ApplicationContext.
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Resource Properties
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As mentioned in the preceding section, ApplicationContext implementations allow for file-like resources to be injected based on path strings given in the configuration file. This capability arises from the ResourceLoader superinterface. For a file-like resource to be injectable on a bean, the receiving property must be specified as an implementation of the org.springframework.core.io.Resource interface. The resource type to be used will be determined by looking for the prefix on the property value.
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CH APT ER 3 T HE HEA RT OF S PR ING: IN VERS IO N O F CO NT ROL
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Listing 3-22 shows a variety of resources that will be resolved to appropriate types.
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Listing 3-22. A Set of Confi12gured Resources
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<bean id="describer" class="com.apress.coupling.ResourceConsumer"> <property name="resources"> <list> <value>classpath:config.xml</value> <value>file:config.xml</value> <value>http://example.com/config.xml</value> <value>ftp://config.xml</value> <value>config.xml</value> </list> </property> </bean> Listing 3-23 shows the implementation of the resources property setter.
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Listing 3-23. A Property Configured to Receive Resources
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public void setResources(final List<Resource> resources) { this.resources = resources; } The Resource interface provides methods allowing a file or URL object to be obtained for the resource, but an exception will be thrown if the resource is not available in the selected form. However, the interface also extends the InputStreamSource interface that allows an InputStream to be obtained from the resource. This method will fail only if the underlying resource does not exist or is inaccessible. The first four examples given in Listing 3-22 are returned (respectively) as a resource from the classpath of the application, from the file system relative to the working directory, as a web request, and as an FTP transfer. The last value, for a named resource with no prefix, is ambiguous; the resource returned will depend on the factory that the bean is hosted within. For example, for the ClassPathXmlApplicationContext used in Listing 3-7, the configuration file would be obtained as a resource from the classpath. Other application context types may return other resource types typically, file resource types from appropriate directory roots.
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Conclusion
In this chapter, you have looked at the core classes of the Spring framework and the configuration files associated with the creation of bean factories from which your configured beans are obtained. In the next chapter, you will look at the facilities that Spring provides for accessing databases, the foundation blocks of any enterprise application.
Data Access
n this chapter, you will look at Spring s support for databases. Spring provides libraries to help you create ordinary JDBC-based data access, but it also provides some support for several Object Relational Mapping (ORM) tools. The examples in this chapter are both based around the data access object (DAO) pattern. This is not the only way in which you can use Spring, but is probably the commonest approach in general use at the moment.
Persistence Frameworks
In this chapter, I build the same DAO implementation upon two different persistence APIs. The first of these is JDBC, the standard database connectivity API in JSE and Java EE. In practice, almost all developers have at least a passing familiarity with the JDBC API. My second DAO implementation is based on the Hibernate ORM framework. I have chosen to use Hibernate because it is a popular and effective tool, because Spring provides comprehensive support for it, and because it is the ORM tool that I am most familiar with. Unfortunately, Hibernate (along with the other ORM tools) is too complicated to explain in detail in this chapter. I am therefore forced to assume that you have some familiarity with Hibernate and to restrict my explanations to the limited parts of it that I happen to use in my examples. Nonetheless, if you are not familiar with Hibernate, I would recommend that you skim through the Hibernate section later in this chapter to see what features you are missing. This is especially true if you are familiar with another ORM tool, as many of the techniques applied to using the Hibernate framework within Spring will be analogous to those required to use other ORM frameworks. Speaking of which, Spring offers support for the following APIs and frameworks: JDBC Java Persistence API (JPA) Java Data Objects (JDO)
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