Autowiring by Constructor

springtutorial21/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

springtutorial21/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>springtutorial04</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.springframework.ide.eclipse.core.springbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.springframework.ide.eclipse.core.springnature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

springtutorial21/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding//src/main/java=UTF-8
+encoding//src/test/java=UTF-8
+encoding/<project>=UTF-8

springtutorial21/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
+org.eclipse.jdt.core.compiler.compliance=1.5
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.5

springtutorial21/.settings/org.eclipse.m2e.core.prefs

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+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

springtutorial21/.springBeans

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+<?xml version="1.0" encoding="UTF-8"?>
+<beansProjectDescription>
+	<version>1</version>
+	<pluginVersion><![CDATA[3.6.2.201410090854-RELEASE]]></pluginVersion>
+	<configSuffixes>
+		<configSuffix><![CDATA[xml]]></configSuffix>
+	</configSuffixes>
+	<enableImports><![CDATA[false]]></enableImports>
+	<configs>
+		<config>src/main/java/com/livingoncodes/spring/springtutorial/beans/beans.xml</config>
+	</configs>
+	<autoconfigs>
+	</autoconfigs>
+	<configSets>
+	</configSets>
+</beansProjectDescription>

springtutorial21/pom.xml

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+<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.livingoncodes.spring</groupId>
+  <artifactId>springtutorial04</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>springtutorial04</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+    	<groupId>org.springframework</groupId>
+    	<artifactId>spring-core</artifactId>
+    	<version>3.2.11.RELEASE</version>
+    </dependency>
+    <dependency>
+    	<groupId>org.springframework</groupId>
+    	<artifactId>spring-beans</artifactId>
+    	<version>3.2.11.RELEASE</version>
+    </dependency>
+    <dependency>
+    	<groupId>org.springframework</groupId>
+    	<artifactId>spring-context</artifactId>
+    	<version>3.2.11.RELEASE</version>
+    </dependency>
+  </dependencies>
+</project>

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/App.java

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+package com.livingoncodes.spring.springtutorial;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+import org.springframework.context.support.FileSystemXmlApplicationContext;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+
+    	ApplicationContext context = new ClassPathXmlApplicationContext("com/livingoncodes/spring/springtutorial/beans/beans.xml");
+
+    	Logger logger = (Logger) context.getBean("logger");
+
+    	logger.writeConsole("Hello there");
+    	logger.writeFile("Hi there");
+
+
+    	((ClassPathXmlApplicationContext) context).close();
+    }
+}

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/ConsoleWriter.java

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+package com.livingoncodes.spring.springtutorial;
+
+public class ConsoleWriter implements LogWriter {
+
+	public void write(String text) {
+		System.out.println(text);
+
+	}
+
+}

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/FileWriter.java

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+package com.livingoncodes.spring.springtutorial;
+
+public class FileWriter implements LogWriter {
+
+	public void write(String text) {
+		System.out.println("Log to file: " + text);
+
+	}
+
+}

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/LogWriter.java

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+package com.livingoncodes.spring.springtutorial;
+
+public interface LogWriter {
+	public void write(String text);
+
+}

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/Logger.java

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+package com.livingoncodes.spring.springtutorial;
+
+public class Logger {
+
+	private LogWriter consoleWriter;
+	private LogWriter fileWriter;
+
+
+	public Logger(ConsoleWriter consoleWriter, FileWriter fileWriter) {
+		this.consoleWriter = consoleWriter;
+		this.fileWriter = fileWriter;
+	}
+
+	public LogWriter getConsoleWriter() {
+		return consoleWriter;
+	}
+
+	public void setConsoleWriter(LogWriter consoleWriter) {
+		this.consoleWriter = consoleWriter;
+	}
+
+	public LogWriter getFileWriter() {
+		return fileWriter;
+	}
+
+	public void setFileWriter(LogWriter fileWriter) {
+		this.fileWriter = fileWriter;
+	}
+
+	public void writeFile(String text) {
+		fileWriter.write(text);		
+	}
+
+	public void writeConsole(String text) {
+		consoleWriter.write(text);
+
+	}
+
+}

springtutorial21/src/main/java/com/livingoncodes/spring/springtutorial/beans/beans.xml

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+<?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 name="consoleWriter" class="com.livingoncodes.spring.springtutorial.ConsoleWriter">
+	</bean>
+
+
+	<bean id="fileWriter" class="com.livingoncodes.spring.springtutorial.FileWriter">
+	</bean>
+
+	<bean id="logger"
+		class="com.livingoncodes.spring.springtutorial.Logger"
+		autowire="constructor">
+	</bean>
+</beans>

springtutorial21/src/test/java/com/livingoncodes/spring/springtutorial/AppTest.java

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+package com.livingoncodes.spring.springtutorial;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}