spring bean attributes

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Spring Framework Bean Configuration (3): annotation-based configuration, autowired Automatic assembly bean, generic dependency Injection

com.atguigu.spring.beans.annotation.test; Import Org.springframework.stereotype.Controller; @Controller // Identify presentation layer components Public class Usercontroller { publicvoid Test () { System.out.println (" panpan789 ");} }The above classes are built under the package com.atguigu.spring.beans.annotation.test;Spring XML configuration file: Beansannotation.xml, with the above four annotations under a Com.atguigu.spring.bean

Spring Bean Configuration 2

-based configuration of beans (based on annotation configuration beans; Assembly of bean attributes based on annotations) scan components in Classpath• Component scanning (component scanning): Spring is able to automatically scan, detect and instantiate components with specific annotations from the classpath.• Specific components include:– @Component: Basic annot

Action, forward, form-bean attributes in struts-config.xml

1> Action attributes and meanings: [Path] relative path of action class [Name] Name of the Action bean associated with this operation (actionform) [Type] full name of the action class connected to the ing (package name available) [Scope] scope of actionform Bean (request or session) [Prefix] [Suffix] [Classname] The default class for fully qualified names of acti

Spring JUnit error: nosuchbeandefinitionexception: no unique bean of type, expected single matching bean B

When the configuration file contains two spring datasource, the following error is reported during spring JUnit testing: Nosuchbeandefinitionexception: no unique bean of type, expected single matching bean but found 2 [performance1, performance2] The annotation of the test class is as follows:@ Runwith (springjunit

[Original] Spring 2.0 Technical Manual Study Notes-Chapter 3 bean, messages, events

Bean can be instantiated through the static factory method. Assume that the following interface is used: Public interface imusicbox {public void play ();} Create the musicboxfactory class and obtain the imusicbox instance. The static method creatmusicbox () is responsible: Public class musicboxfactory {public static imusicbox createmusicbox () {return New imusicbox () {public void play () {system. out. println ("playing piano music ");}};}}

Spring Core Learning (5) Inject bean bean-parsing dependency

Leading: Start learning Spring core ideas and learn with a cottage Lite spring code.Content: 1. beanreference-Save a reference to the bean. 2. Call Createbean ()-lazy-init in Getbean (). This time we used the bean in the case of injecting beans, here we rewrite the abstractbeanfactory again, the rewritten abstractbeanf

Spring Source Analysis (v) Analysis <bean></bean>

In this chapter we analyze how spring parses //Org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader1 Private voidparsedefaultelement (Element ele, beandefinitionparserdelegate delegate) {2 if(Delegate.nodenameequals (Ele, import_element)) {3 Importbeandefinitionresource (ele);//4 }5 Else if(Delegate.nodenameequals (Ele, alias_element)) {6 processaliasregistration (ele);//7 }8 Else if(Del

Assembly-DAYS02 of the Bean in the Spring Combat series

cdplayer CDPlayer (Compactdisc compactdisc) { returnnew CDPlayer ( COMPACTDISC);}Perhaps the code above looks a little more intuitive. This actually passes through the Cdplay () method to a Compactdisc object and completes the injection through the constructor. And there is no direct relationship with @bean Compactdisc. A little modification of the code is the injection of setter attributes:@

[JAVA] [Spring] The difference between a bean's naming problem (ID and name difference) and ref and IDREF in spring

, 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 t

The scope and life cycle of spring bean

In the previous blog mentioned in the container launch Get Beandefinition object has a scope property. This property controls the scope of the Bean object. This section describes the scope and life cycle of the bean, and how it does not.I. Scope of the BeanThe bean container starts reading the bean's XML configuration file, and then converts each

Spring Singleton Bean and prototype bean dependency

This document is synchronized to: http://www.waylau.com/spring-singleton-beans-with-prototype-bean-dependencies/ ProblemWe know that the Spring bean default scope is singleton (singleton), but some scenarios (such as multithreading) require each call to generate an instance,At this point, scope should be set to prototy

SPRING-002-IOC Bean Configuration

First, Bean naming1. Direct naming1.1, directly using the spring default naming method, do not specify id;1.2, only the fully qualified class name must be configured by the IOC container for it to generate an identity, 1.3, the client must pass the interface "T Getbean (classclass= "Wang.conge.HelloImpl"/>= Application.getbean (Helloimpl. Class);2. ID NameEach bean

Spring strategy learning notes (1.13) -- Inherit bean Configuration

I. knowledge points When you configure beans in the Spring IoC container, you may have more than one bean that shares some common configurations, such as attributes and attributes in the Spring allows you to extract common bean c

Spring Beans source interpretation of the--bean annotation (annotation)

With the introduction of spring annotations, more and more developers began to use annotations, this article will explain the mechanism of the annotations in series, do not seek thorough, but to string up the spring beans annotation of the pearl, show to everyone.1. Common annotations for Spring beans:Public @interface autowired: You can annotate member variables

Simple Analysis of bean construction process in Spring IoC container

Spring construction bean and Management initialization life cycle are processed in abstractautowirecapablebeanfactory, which can be divided into construction bean and subsequent management bean initialization life cycle. 1. Construct Bean 1.1 method call Diagram The entry to

The understanding of beans in spring and the role of @bean

First, what is a bean?1, Java object-oriented, the object has methods and properties, then you need an object instance to invoke methods and properties (i.e. instantiation);2. All classes that have methods or attributes need to be instantiated to use these methods and attributes in order to be figurative;3. Rule: All subclasses and classes with methods or

Spring Reading notes-----The configuration dependency of spring bean

The previous blog introduces the basic concepts and scopes of beans in spring (Spring Reading notes-----The basic concepts of spring bean beans), and now introduces The basic configuration of the Spring Bean . from the beginning w

Spring actual Bean's automatic assembly (non-annotated mode)

matches the type of the property.But Bytype automatic assembly has one limitation: What if Spring finds multiple beans whose type matches the type of attributes that need to be automatically assembled? In this scenario, spring does not guess which Bean is more suitable for automatic assembly, but instead chooses to th

"Spring Combat"--4 The Bean's init and destroy methods in spring

This article focuses on the operations that are added in spring by configuring the Init-method and Destroy-method methods to implement the initialization and destruction of beans. In Java, we don't need to manage memory or variables, and in C or C + +, you can create and delete variables or objects in the form of new and delete. In spring, if you want to initialize and end a

Spring decryption-detailed explanation of XML parsing and Bean registration examples, springbean

{/*** parse other nodes under the root node import "," alias "," bean ". * @ param root node name */protected void parseBeanDefinitions (Element root, BeanDefinitionParserDelegate delegate) {if (delegate. isDefaultNamespace (root) {NodeList nl = root. getChildNodes (); for (int I = 0; I Delegates The BeanDefinitionParserDelegate class's parseBeanDefinitionElement Method for element parsing and returns the BeanDefinitionHolder type instance bdHolder

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