目錄結構

pom.xml

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.geyao</groupId><artifactId>spring01geyao</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.13.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>3.2.0.RELEASE</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>4.3.4.RELEASE</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>4.3.4.RELEASE</version><scope>test</scope></dependency></dependencies> </project>

log4j.properties

### 設置### log4j.rootLogger = ERROR,stdout### 輸出信息到控制抬 ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n log4j.category.org.springframework.beans.factory=ERROR

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?> <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"><!--bean元素：描述當前的對象需要由spring容器管理id屬性：標識對象 未來在應用程序中可以根據id獲取對象class對象：被管理的對象的全名--><bean id="notepad" class="com.geyao.demo.NotePad" scope="singleton"/> </beans>

notepad類

package com.geyao.demo;public class NotePad {public NotePad() {super();System.out.println("NotePad的構造函數"+this.toString());} }

Notepadtest類

package com.geyao.demo;import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; //無論我們是否去主動獲取對象，spring上下文剛加載就會創建對象 //無論獲取多少次，都是統一對象 // public class NotepadTest {@Testpublic void test01(){ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");NotePad notePad1= (NotePad)context.getBean("notepad");NotePad notePad2= (NotePad)context.getBean("notepad");System.out.println(notePad1=notePad2);} }

notepadtestAuto類

package com.geyao.demo;import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class NotePadTestAuto {@Autowiredprivate NotePad notePad1;@Autowiredprivate NotePad notePad2;@Testpublic void test01(){System.out.println(notePad1==notePad2);} }

運行結果

NotePad的構造函數com.geyao.demo.NotePad@478190fc com.geyao.demo.NotePad@478190fc

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總結

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