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Category: "java"2013-12-09 16:29 1020 People read reviews (0) favorite reports 1. IntroductionUnder the SSH framework, suppose we put the configuration file under the Src/datasource.properties path of the project, and the spring configuration file is also src/ Applicationcontext.xml path, we can read the configuration file with spring Property-placeholder and inject it into the
We mentioned spring Bean factory when talking about the factory model. Here is a detailed description: Http://wenku.baidu.com/view/69f94e80d0d233d4b14e6970.html? St = 1 download in Word format: Download in Word format: Spring bean containers and bean factories, also k
If you need to perform specific initialization and cleanup operations when the Bean is created or destroyed, there are two options in Spring. 1. Define the init-method and destroy-method attributes of bean in XML. Execute the init and destroy Methods unforcibly, and configure them freely in xml. The dependency with the
It's easy to understand the Spring Bean's life cycle. When a bean is instantiated, it may need to perform some initialization to convert it to a usable state. Similarly, some cleanup work may be required when the bean is no longer needed and removed from the container. The full life cycle of the bean undergoes various
Spring learning notes-three ways for Spring to instantiate Bean 1. Use the class constructor for instantiationThis is the most familiar and commonly used one. This is actually implemented by calling the default constructor of UserServiceBean.2. Static factory Method public class UserServiceBeanFactory { public static UserServiceBean createUserServiceBean()
attributes:Spring supports 3 kinds of dependency injection methods-Attribute Injection-Constructor Injection-factory method injection (rarely used, not recommended)Property injection is a setter method that injects the bean's property values or dependent objectsAttribute injection uses the Attribute injection is the most commonly used injection method in practical applications.1 Configuration Bean2 the full class name of the Class:bean, which creates the be
I. OverviewThe container is the core of the spring framework, and the spring container uses IOC to manage all components that comprise the application system. Spring has two different containers: Beanfactory provides the simplest container, provides the most basic dependency injection support, ApplicationContext based on Beanfactory, provides system architecture
The property values for a Java instance can have many data types, primitive type values, string types, Java instances, and even other bean instances, Java collections, arrays, and so on. So spring allows you to specify values for the properties of the bean instance through the following elements:ValueRefBeanlist, set, map, propsFirst, Value: Set normal property v
Scope is used to configure the scope of spring bean, which identifies the scope of bean. Before spring2.0, beans have only two scopes: Singleton (Singleton), non-singleton (also known as prototype), and spring2.0, added three beans for the Web application context: session, request, and global session. Therefore, spring2.0 currently has five types of beans by defa
;import Org.junit.test;import Org.junit.runner.runwith;import Org.springframework.beans.factory.annotation.autowired;import Org.springframework.context.applicationcontext;import org.springframework.test.context.ContextConfiguration; Import Org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith (Springjunit4classrunner.class) @ Contextconfiguration (locations = {"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_7/ Applicationcontext-test.xml "}) public class Caketest {@Auto
to Spring advanced path (7)-Bean lifecycle and creation and destruction execution processes. 5. @ Resource: inject by name. This annotation is a jdk annotation, but it is widely used in projects. 6. @ Autowired: Automatic Injection Based on type matching. The two annotations here are mainly used to inject values for attributes in the class. The two annotations c
, and Alias1,alias2,alias3,alias4 is an alias, which can be used as the bean's key value;6, you can use the The difference between ref and IDREFIn spring, both the Idref property and the ref attribute can be injected into the constructor-arg element and the property element, so what's the difference between it?Consider the following configuration:In fact, IDREF injects the ID of the target bean instead of
;importcom.springapp.mvc.easyBean.Sword;import org.springframework.context.annotation.bean;importorg.springframework.context.annotation.componentscan; importorg.springframework.context.annotation.configuration;/***createdby xucon2018/1/7.* Configuration Class */@ComponentScan (basepackages={"Com.springapp.mvc" }) @Configurationpublic classApplication{ @Bean (name= "Braves") Publicbravesbraves () { returnnewbraves (Sword ()); } @
This article mainly includes Bean Factory knowledge in spring. It mainly includes the following topics: 1. Bean factory at the beginning of getstart 2. Bean basic definition 3. Create a bean using the constructor 4. Create a bean
The bean definition in spring contains a lot of information, such as constructor parameters, property-specified dependencies, initialization methods, factory classes, and factory methods.If each bean in the spring container repeatedly declares these properties, it is very annoying and very inefficient and error-prone.
look for the same bean as the property type, and when found, by calling Setperson ( Person person) to inject it.What if there are two beans of the same type in the configuration file? As follows:Once configured as above, two beans of the same data type are configured and will throw unsatisfieddependencyexception exceptions, see the following:So, once you have selected the ' Bytype ' type of automatic assembly, make sure that each data type in your pr
1.SpEL to achieveThe person class, whose attributes are as follows, does not write the Get,set,tostrong method.Private String name; Private Car car; Private String city; // The city attribute refers to the attribute of city in address Private String info; // based on the price property of car to determine that Info,price is greater than 300,000, not greater than 300,000Car class, whose properties are as follows, the Set,get,tostring method will not wr
());Parseconstructorargelements (Ele, BD);Parsepropertyelements (Ele, BD);Parsequalifierelements (Ele, BD);return new Beandefinitionholder (BD, Beanname, Aliasesarray); Follow in, we see the bottom of the analysis, such as parsemetaelements, here no further analysis.For the configuration file, parsing is finished, decoration is finished, the XML has been encapsulated in the attributes of the bean element t
In the previous example of user registration, we have used spring to define a user persistence class: This is one of the simplest bean definitions. It is similar to calling a statement: Memoryuserdaouserdao = new Memoryuserdao (). The ID attribute must be a valid xmlid, which means it must be unique throughout the XML document. It is a bean's "Lifetime Code (9527)". You can also use the Name property to de
Turn from: also on the life cycle of spring beanBegin by using an old diagram to describe the life cycle of the bean container in spring.Socialize, remember that a blog post mentions: "The Spring bean container only manages the life cycle of non-singleton beans, and the life cycle of the singleton
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