Spring IOC Dependency Injection Project

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This is BKnight.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class BKnight implements Knight {   private final static Logger LOGGER = Logger.getLogger(BKnight.class);      private Quest quest;   public BKnight() {   }   public BKnight(Quest quest) {     this.quest = quest;   }   public BKnight(Quest quest, Music music) {     this.quest = quest;   }   public Quest getQuest() {     return quest;   }   public void setQuest(Quest quest) {     this.quest = quest;   }   @Override   public void embarkOnQuest() {     LOGGER.info("embarkOnQuest() called :BKnight");     quest.embark();   } }

This is DQuest.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class DQuest implements Quest {      private final static Logger LOGGER = Logger.getLogger(DQuest.class);      @Override   public void embark() {     LOGGER.info("embark() called:DQuest");   } }

This is Knight.java file having the source code to execute business logic.

package com.cv.spring.ioc; /**  * @author Chandra Vardhan  */ public interface Knight {      void embarkOnQuest();    }

This is KnightTest.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; /**  * @author Chandra Vardhan  */ public class KnightTest {   /**    * @param args    */   public static void main(String[] args) {     String configLocation = "src/main/resources/applicationContext.xml";     ApplicationContext factory = new FileSystemXmlApplicationContext(configLocation);           String beanName = "knight";          Knight knight = (Knight) factory.getBean(beanName);     knight.embarkOnQuest();   } }

This is Music.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class Music {      private final static Logger LOGGER = Logger.getLogger(Music.class);         public void singBeforeQuest() {     LOGGER.info("Before Quest it is called... singBeforeQuest(): Music");   }   public void singAfterQuest() {     LOGGER.info("After Quest it is called... singAfterQuest(): Music");   } }

This is NQuest.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class NQuest implements Quest {      private final static Logger LOGGER = Logger.getLogger(NQuest.class);         @Override   public void embark() {     LOGGER.info("embark() called:NQuest");   } }

This is Quest.java file having the source code to execute business logic.

package com.cv.spring.ioc; /**  * @author Chandra Vardhan  */ public interface Quest {   void embark(); }

This is SKnight.java file having the source code to execute business logic.

package com.cv.spring.ioc; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class SKnight implements Knight {      private final static Logger LOGGER = Logger.getLogger(SKnight.class);      private Quest quest;   public SKnight() {   }   public SKnight(Quest quest) {     this.quest = quest;   }   @Override   public void embarkOnQuest() {     LOGGER.info("embarkOnQuest() called :SKnight");     quest.embark();   } }

This is pom.xml file having the entries of dependency jars and information to build the application .

<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">.0" encoding="UTF-8"?> <modelVersion>4.0.0</modelVersion> <groupId>com.cv.spring.annotation</groupId> <artifactId>SpringIOCDependencyInjection</artifactId> <name>SpringIOCDependencyInjection</name> <packaging>jar</packaging> <version>1.0</version> <properties> <java-version>1.8</java-version> <log4j-version>1.2.16</log4j-version> <org.springframework-version>4.1.6.RELEASE</org.springframework-version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>javax.inject</groupId> <artifactId>javax.inject</artifactId> <version>1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>

This is applicationContext.xml file having the spring configuration properties.

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <bean id="knight" class="com.cv.spring.ioc.SKnight"> <constructor-arg ref="quest" /> </bean> <bean id="quest" class="com.cv.spring.ioc.NQuest" /> </beans>

This is log4j.properties file having the entries for logging the information into the console/file.

#By default enabling Console appender # Root logger option log4j.rootLogger=INFO, stdout # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n # Redirect log messages to a log file #log4j.appender.file=org.apache.log4j.RollingFileAppender #log4j.appender.file.File=C:\servlet-application.log #log4j.appender.file.MaxFileSize=5MB #log4j.appender.file.MaxBackupIndex=10 #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n