Add missing code snippets (#9228)

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/configuration/processor/JdbcProperties.java

@@ -0,0 +1,21 @@
+package com.baeldung.configuration.processor;
+
+import org.springframework.boot.context.properties.*;
+import org.springframework.context.annotation.*;
+import org.springframework.beans.factory.annotation.*;
+
+@Configuration
+@ConfigurationProperties(prefix = "com.baeldung")
+public class JdbcProperties {
+
+    @Value("${jdbc.url:jdbc:postgresql:/localhost:5432}")
+    private String jdbcUrl;
+
+    public String getJdbcUrl() {
+        return jdbcUrl;
+    }
+
+    public void setJdbcUrl(String jdbcUrl) {
+        this.jdbcUrl = jdbcUrl;
+    }
+}

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/configuration/processor/PropertyBeanInjection.java

@@ -6,16 +6,23 @@ import org.springframework.stereotype.*;
 @Component
 public class PropertyBeanInjection {
 
-    private final CustomProperties customProperties;
+    private CustomProperties customProperties;
 
-    PropertyBeanInjection(@Autowired CustomProperties customProperties) {
+    private JdbcProperties jdbcProperties;
+
+    PropertyBeanInjection(@Autowired CustomProperties customProperties, @Autowired JdbcProperties jdbcProperties) {
         this.customProperties = customProperties;
+        this.jdbcProperties = jdbcProperties;
     }
 
     String getUrl() {
         return customProperties.getUrl();
     }
 
+    String getJdbcUrl() {
+        return jdbcProperties.getJdbcUrl();
+    }
+
     int getTimeoutInMilliseconds() {
         return customProperties.getTimeoutInMilliSeconds();
     }

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/configurationproperties/Database.java

@@ -0,0 +1,36 @@
+package com.baeldung.configurationproperties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+
+@ConfigurationProperties(prefix = "database")
+public class Database {
+
+    String url;
+    String username;
+    String password;
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/configurationproperties/DatabaseConfig.java

@@ -0,0 +1,23 @@
+package com.baeldung.configurationproperties;
+
+import org.springframework.core.env.Environment;
+import org.springframework.beans.factory.annotation.*;
+import org.springframework.context.annotation.*;
+
+@Configuration
+public class DatabaseConfig {
+
+    @Autowired private Environment env;
+
+    @Bean(name="dataSource")
+    public Database dataSource() {
+
+        Database dataSource = new Database();
+        dataSource.setUrl(env.getProperty("jdbc.url"));
+        dataSource.setUsername(env.getProperty("database.username"));
+        dataSource.setPassword(env.getProperty("database.password"));
+
+        return dataSource;
+    }
+
+}

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/configurationproperties/DatabaseConfigPropertiesApp.java

@@ -0,0 +1,13 @@
+package com.baeldung.configurationproperties;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan(basePackageClasses = {Database.class,DatabaseConfig.class})
+public class DatabaseConfigPropertiesApp{
+
+    public static void main(String[]args) {SpringApplication.run(DatabaseConfigPropertiesApp.class,args);}
+
+}

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/properties/spring/PropertyPlaceholderConfig.java

@@ -0,0 +1,23 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.*;
+
+@Configuration
+public class PropertyPlaceholderConfig {
+
+    public PropertyPlaceholderConfig(){
+        super();
+    }
+
+    @Bean
+    public static PropertyPlaceholderConfigurer properties() {
+        PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer();
+        Resource[] resources = new ClassPathResource[]{ new ClassPathResource("foo.properties") };
+        ppc.setLocations( resources );
+        ppc.setIgnoreUnresolvablePlaceholders( true );
+        return ppc;
+    }
+}

spring-boot-modules/spring-boot-properties/src/main/java/com/baeldung/properties/spring/PropertySourcesPlaceholderConfig.java

@@ -0,0 +1,24 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.*;
+
+@Configuration
+public class PropertySourcesPlaceholderConfig{
+
+    public PropertySourcesPlaceholderConfig(){
+        super();
+    }
+
+    @Bean
+    public static PropertySourcesPlaceholderConfigurer properties(){
+        PropertySourcesPlaceholderConfigurer pspc = new PropertySourcesPlaceholderConfigurer();
+        Resource[] resources = new ClassPathResource[]{ new ClassPathResource("foo.properties") };
+        pspc.setLocations(resources);
+        pspc.setIgnoreUnresolvablePlaceholders(true);
+        return pspc;
+    }
+
+}