Spring Learning Path (i) Spring introduction

1. Introduction of JAR Package

Spring Core jar Package
Spring-beans-4.3.2.release.jar
Spring-core-4.3.2.release.jar
Spring-context-4.3.2.release.jar
Spring-expression-4.3.2.release.jar
Spring Log jar Package
Log4j-1.2.17.jar
Commons-logging-1.1.3.jar
Spring Annotations jar Package
Spring-aop-4.3.2.release.jar
Spring AOP Operations
Aopalliance-1.0.jar
Aspectjweaver-1.8.7.jar
Spring-aop-4.3.2.release.jar
Spring-aspects-4.3.2.release.jar
log File
log4j.properties-"placed under SRC
Spring-to-database operations
Spring-tx-4.3.2.release.jar
Spring-jdbc-4.3.2.release.jar
c3p0 Connection Pool
C3p0-0.9.2.1.jar
Mchange-commons-java-0.2.3.4.jar

2. Creating classes, writing methods in classes

 Public class User {    publicvoid  Add () {        System.out.println ("Add----------");    } // Public     static void Main (string[] args) {////         Original Practice //          User user = new user (); //         User.add (); //     }}

3. Configure the spring file, configure the class file

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation= "Http://www.springframework.org/schema/beans Http://www.springframework.org/schema/beans/spring-bean S.xsd "><!--Getting started with IOC -    <!--Bean Tag id attribute: A custom value; class: The path to the classes when getting the value of the created object -    <BeanID= "User"class= "Com.ioc.User"></Bean></Beans>

4. Write code debugging test object creation

 PackageCom.junit;Import Staticorg.junit.assert.*;Importorg.junit.Test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;ImportCom.ioc.User; Public classText {@Test Public voidTest () {//load Spring configuration fileApplicationContext context =NewClasspathxmlapplicationcontext ("Bean1.xml");//gets the object created by the configuration object user is the value of the bean tag id attribute in the spring configuration fileUser user = (user) Context.getbean ("user"));//gets to the User class, and executes the Add methodUser.add (); }}

Three ways to instantiate a bean

1, using the non-parametric construction method of the class to create (focus)-"above case;"

2. Create with Static factory

 PackageCom.ioc;Importorg.junit.Test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;//class Public classbean2 { Public voidAdd () {System.out.println ("Add--------------"); }}//Static Factory Public classFactory {//returning a Bean object using a static method     Public Staticbean2 getBean2 () {return Newbean2 (); }}//Test@Test Public voidTest () {//load Spring configuration fileApplicationContext context =NewClasspathxmlapplicationcontext ("Bean1.xml");//get the object created by the configuration objectBean2 bean2 = (bean2) context.getbean ("Bean2"); System.out.println (bean2);}

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation= "Http://www.springframework.org/schema/beans Http://www.springframework.org/schema/beans/spring-beans . xsd "><!--Getting started with IOC -    <!--Bean Tag id attribute: A custom value; class: The path to the classes when getting the value of the created object -    <BeanID= "User"class= "Com.ioc.User"></Bean>    <!--Destroy-method: Pointer to a static method name in Factory -    <BeanID= "Bean2"class= "Com.factory.Factory"Factory-method= "GetBean2"></Bean></Beans>

configuration file

3. Create with Instance factory

 PackageCom.ioc;Importorg.junit.Test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;//class Public classbean2 { Public voidAdd () {System.out.println ("Add--------------"); }}//Instance factory class Public classFactory {//Common Methods     Publicbean2 getBean2 () {return Newbean2 (); }}/**Profile <!--instance Factory--<bean id= "bean2factory" class= "Com.factory.Factory" ></bean> <bean Id= "bean2" factory-bean= "Bean2factory" factory-method= "getBean2" ></bean>*///Test@Test Public voidTest () {//load Spring configuration fileApplicationContext context =NewClasspathxmlapplicationcontext ("Bean1.xml");//get the object created by the configuration objectBean2 bean2 = (bean2) context.getbean ("Bean2"); System.out.println (bean2);}

Spring Learning Path (i) Spring introduction