Added code for https://jstobigdata.com/spring/spring-@propertysource-to-read-property-files/

Author: Bikraji

pom.xml

@@ -14,6 +14,7 @@
     <module>spring-core-ioc</module>
     <module>spring-bean-lifecycle</module>
     <module>spring-core-beanpostprocessor</module>
+    <module>spring-core-environment-abstraction</module>
   </modules>
 
   <properties>

spring-core-environment-abstraction/pom.xml

@@ -0,0 +1,38 @@
+<?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">
+  <parent>
+    <artifactId>spring-framework-tutorial-parent</artifactId>
+    <groupId>com.jstobigdata</groupId>
+    <version>1.0-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>spring-core-environment-abstraction</artifactId>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.springframework</groupId>
+      <artifactId>spring-core</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework</groupId>
+      <artifactId>spring-context</artifactId>
+    </dependency>
+  </dependencies>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.jstobigdata</groupId>
+        <artifactId>spring-tutorial-boms</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+</project>

spring-core-environment-abstraction/src/main/java/com/jsbd/propertysource/AppConfig.java

@@ -0,0 +1,11 @@
+package com.jsbd.propertysource;
+
+import org.springframework.context.annotation.*;
+
+@Configuration
+@PropertySource("classpath:app.properties")
+@ComponentScan("com.jsbd.propertysource")
+//@ImportResource("classpth:${app.name}.xml")
+public class AppConfig {
+
+}

spring-core-environment-abstraction/src/main/java/com/jsbd/propertysource/AppLogger.java

@@ -0,0 +1,17 @@
+package com.jsbd.propertysource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+@Component
+public class AppLogger {
+
+  @Autowired
+  private Environment env;
+
+  public void printLogLevel() {
+    String logLevel = env.getProperty("app.log.level");
+    System.out.println(logLevel);
+  }
+}

spring-core-environment-abstraction/src/main/java/com/jsbd/propertysource/ConnectionManager.java

@@ -0,0 +1,32 @@
+package com.jsbd.propertysource;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import java.util.StringJoiner;
+
+@Component
+public class ConnectionManager {
+
+  @Value("${app.database.url}")
+  private String url;
+
+  @Value("${app.database.username}")
+  private String username;
+
+  @Value("${app.database.password}")
+  private String password;
+
+  @Value("${no.value}")
+  private String noValue;
+
+  @Override
+  public String toString() {
+    return new StringJoiner(", ", ConnectionManager.class.getSimpleName() + "[", "]")
+        .add("url='" + url + "'")
+        .add("username='" + username + "'")
+        .add("password='" + password + "'")
+        .add("noValue='" + noValue +"'")
+        .toString();
+  }
+}

spring-core-environment-abstraction/src/main/java/com/jsbd/propertysource/TestClass.java

@@ -0,0 +1,14 @@
+package com.jsbd.propertysource;
+
+    import org.springframework.context.ApplicationContext;
+    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class TestClass {
+  public static void main(String[] args) {
+    ApplicationContext context
+        = new AnnotationConfigApplicationContext(AppConfig.class);
+    System.out.println(context.getBean(ConnectionManager.class));
+
+    context.getBean(AppLogger.class).printLogLevel();
+  }
+}

spring-core-environment-abstraction/src/main/resources/app.properties

@@ -0,0 +1,4 @@
+app.database.url=http://random-url
+app.database.password=abcd@123
+app.database.username=root
+app.log.level=DEBUG

spring-core-ioc/src/main/java/basic/ioc/beanfactory/AutowireBeanConfig.java

@@ -0,0 +1,23 @@
+package basic.ioc.beanfactory;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+
+import java.util.Random;
+import java.util.UUID;
+
+@Configuration
+@ComponentScan("basic.ioc.autowire")
+public class AutowireBeanConfig {
+
+  @Bean
+  @Scope("prototype")
+  public Item item(){
+    return new Item(
+        new Random().nextLong(),
+        UUID.randomUUID().toString()
+    );
+  }
+}

spring-core-ioc/src/main/java/basic/ioc/beanfactory/Item.java

@@ -0,0 +1,40 @@
+package basic.ioc.beanfactory;
+
+import java.util.StringJoiner;
+
+public class Item {
+  private Long id;
+  private String name;
+
+  public Item() {
+  }
+
+  public Item(Long id, String name) {
+    this.id = id;
+    this.name = name;
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  @Override
+  public String toString() {
+    return new StringJoiner(", ", Item.class.getSimpleName() + "[", "]")
+        .add("id=" + id)
+        .add("name='" + name + "'")
+        .toString();
+  }
+}

spring-core-ioc/src/main/java/basic/ioc/beanfactory/Store.java

@@ -0,0 +1,53 @@
+package basic.ioc.beanfactory;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Component;
+
+import java.util.StringJoiner;
+import java.util.UUID;
+
+@Component
+@Scope("prototype")
+public class Store {
+  private String id;
+
+  /* Field injection is not recommended. Instead use, Constructor
+    or Setter injection
+   */
+  @Autowired
+  private Item item;
+
+  public Store() {
+    id = UUID.randomUUID().toString();
+  }
+
+  public Store(String id, Item item) {
+    this.id = id;
+    this.item = item;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public void setId(String id) {
+    this.id = id;
+  }
+
+  public Item getItem() {
+    return item;
+  }
+
+  public void setItem(Item item) {
+    this.item = item;
+  }
+
+  @Override
+  public String toString() {
+    return new StringJoiner(", ", Store.class.getSimpleName() + "[", "]")
+        .add("id=" + id)
+        .add("item=" + item)
+        .toString();
+  }
+}