Getting started with the 1.Spring framework

**spring Framework's IOC core feature QuickStart (must master the development steps) **0. What is the function of the IOC? * ioc--inverse of control, inversion, reverse the creation of objects to spring!! * Use IOC to solve the problem of high coupling of programs!! 1. Step one: Download the Spring Framework development Package * The download path is: http://repo.spring.io/webapp/search/artifact/?0&q=spring-framework* the directory structure following the decompression * docs--API and Development specification * libs--JAR package and Source * Spring Framework's jar package is characterized by a jar package with 3 (using Jar package, document jar package and source code jar package) * schema--constraint 2. Step Two: Create the Javaweb project, introduce spring's development package * Introduce the Spring framework IOC core functionality required by the specific JAR package * Spring Framework IOC features, then according to the spring framework of the architecture diagram can see, only need to introduce the following jar package * Under spring-framework-3.2.0.release/libs/* beans* core* context* Expression language* Spring Framework also requires the introduction of log-related jar packages * In spring-framework-3.0.2.release-dependencies/org.apache.commons/com.springsource.org.apache.commons.logging/ 1.1.1* com.springsource.org.apache.commons.logging-1.1.1.jar* also needs to introduce LOG4J's jar package spring-framework-3.0.2.release-dependencies\org.apache.log4j\com.springsource.org.apache.log4j\1.2.15* Com.springsource.org.apache.log4j-1.2.15.jar3. Step three: Create the corresponding package structure, write Java classes, note: The future use of spring framework for development, all need to write interface and implementation Class!! * Com.itcast.demo1* userservice--interface * userserviceimpl--Specific implementation Class 4. Step four: To create the Userserviceimpl implementation class to the spring framework to manage, you need to create a spring framework configuration file, complete configuration * 1. In the SRC directory to create the Applicationcontext.xml configuration file, the name can be arbitrary, but will generally use the default name!! * 2. To introduce the constraints of spring, we need to find the specific constraint header information first!! * spring-framework-3.2.0.release\docs\spring-framework-reference\html\xsd-config.html* specific constraints are as follows: <beans xmlns= " Http://www.springframework.org/schema/beans "xmlns:xsi=" Http://www.w3.org/2001/XMLSchema-instance "Xsi:schem alocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans.xsd "></beans>* 3. Complete UserService Configuration <!--Spring QuickStart--><bean id= "UserService" class= "Com.itcast.demo1.UserServiceImpl"/> 5. Step five: Write a test program, using the Spring Framework factory way to get to the UserService interface specific implementation Class!! * The specific code is as follows: public void Demo2 () {//factory using spring: applicationcontext ApplicationContext = new Classpathxmlapplicationcontext ("Applicationcontext.xml");//factory-acquired class: UserService UserService = (userservice) Applicationcontext.getbean ("UserService"); Userservice.sayhello ();

Applicationcontext.xml:

<?xml version= "1.0" encoding= "UTF-8"?><!--introduce schema constraints--><beans xmlns= "/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 "><!--need to configure a specific bean--    <bean id=" UserService "class=" demo1. Userserviceimpl "></bean>    <bean id=" UserService2 "class=" demo1. USERSERVICEIMPL2 "></bean></beans>

UserService:

Package Demo1;public interface UserService {public void Save ();}

Userserviceimpl:

Package Demo1;public class Userserviceimpl implements Userservice{public void Save () {System.out.println (" Userserviceimpl executed ");}}

SpringDemo1: (Test)

Package Demo1;import Org.junit.test;import Org.springframework.context.applicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;public class SpringDemo1 {/** * traditional way */@ testpublic void Run1 () {///Traditional way UserService us=new Userserviceimpl (); Us.save ();} /** * Using Spring's IOC */@Testpublic void run2 () {//Get Spring Factory object ApplicationContext ac=new Classpathxmlapplicationcontext ("Applicationcontext.xml");//Gets the specific Bean instance object from the factory, the parameter is the ID value in the configuration file userservice US = ( UserService) Ac.getbean ("UserService"); Us.save ();}}

　　

Getting started with the 1.Spring framework