How to read values from properties file

Question

I am using spring  I need to read values from properties file  This is internal properties file not the external properties file  Properties file can be as below     some properties ---file name  values are below   abc   abc def   dsd ghi   weds jil   sdd   I need to read those values from the properties file not in traditional way   How to achieve it  Is there any latest approach with spring 3 0

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project structure   http   i stack imgur com RAGX3 jpg -------------------------------     package beans           import java util Properties          import java util Set           public class PropertiesBeans                private Properties properties               public void setProperties Properties properties                    this properties   properties                             public void getProperty                    Set keys   properties keySet                    for  Object key   keys                        System out println key       properties getProperty key toString                                                     ----------------------------          package beans           import org springframework context ApplicationContext          import org springframework context support ClassPathXmlApplicationContext           public class Test                public static void main String   args                       TODO Auto-generated method stub                 ApplicationContext ap   new ClassPathXmlApplicationContext  resource spring xml                    PropertiesBeans p    PropertiesBeans ap getBean  p                    p getProperty                                 ----------------------------   - driver properties      Driver   com mysql jdbc Driver     url   jdbc mysql   localhost 3306 test     username   root     password   root     ----------------------------          lt beans xmlns  http   www springframework org schema beans                 xmlns xsi  http   www w3 org 2001 XMLSchema-instance                 xmlns util  http   www springframework org schema util                 xsi schemaLocation           http   www springframework org schema beans http   www springframework org schema beans spring-beans-3 0 xsd         http   www springframework org schema util http   www springframework org schema util spring-util-3 0 xsd  gt                lt bean id  p  class  beans PropertiesBeans  gt                   lt property name  properties  gt                       lt util properties location  classpath resource driver properties   gt                   lt  property gt               lt  bean gt            lt  beans gt

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You need to put a PropertyPlaceholderConfigurer bean in your application context and set its location property   See details here   http   www zparacha com how-to-read-properties-file-in-spring   You might have to modify your property file a bit for this thing to work   Hope it helps

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I ll recommend reading this link https   docs spring io spring-boot docs current reference html boot-features-external-config html from SpringBoot docs about injecting external configs  They didn t only talk about retrieving from a properties file but also YAML and even JSON files  I found it helpful  I hope you do too

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Here is an additional answer that was also great help for me to understand how it worked   http   www javacodegeeks com 2013 07 spring-bean-and-propertyplaceholderconfigurer html     any BeanFactoryPostProcessor beans have to be declared with a static  modifier    Configuration  PropertySource  classpath root test props   public class SampleConfig     Value    test prop     private String attr    Bean  public SampleService sampleService       return new SampleService attr         Bean  public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer       return new PropertySourcesPlaceholderConfigurer

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Another way is using a ResourceBundle  Basically you get the bundle using its name without the   properties   private static final ResourceBundle resource   ResourceBundle getBundle  config      And you recover any value using this   private final String prop   resource getString  propName

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Configure PropertyPlaceholder in your context    lt context property-placeholder location  classpath  my properties   gt    Then you refer to the properties in your beans    Component class MyClass      Value    my property name      private String   myValues      EDIT  updated the code to parse property with mutliple comma-separated values   my property name aaa bbb ccc   If that doesnt work  you can define a bean with properties  inject and process it manually    lt bean id  myProperties        class  org springframework beans factory config PropertiesFactoryBean  gt     lt property name  locations  gt       lt list gt         lt value gt classpath  my properties lt  value gt       lt  list gt     lt  property gt   lt  bean gt    and the bean    Component class MyClass      Resource name  myProperties     private Properties myProperties      PostConstruct   public void init            do whatever you need with properties

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I wanted an utility class which is not managed by spring  so no spring annotations like  Component   Configuration etc  But I wanted the class to read from application properties  I managed to get it working by getting the class to be aware of the Spring Context  hence is aware of Environment  and hence environment getProperty   works as expected   To be explicit  I have   application properties  mypath somestring   Utils java  import org springframework core env Environment      No spring annotations here public class Utils       public String execute String cmd               Making the class Spring context aware         ApplicationContextProvider appContext   new ApplicationContextProvider            Environment env   appContext getApplicationContext   getEnvironment                env getProperty   works            System out println env getProperty  mypath               ApplicationContextProvider java  see Spring get current ApplicationContext   import org springframework beans BeansException  import org springframework context ApplicationContext  import org springframework context ApplicationContextAware  import org springframework stereotype Component    Component public class ApplicationContextProvider implements ApplicationContextAware       private static ApplicationContext CONTEXT       public ApplicationContext getApplicationContext             return CONTEXT             public void setApplicationContext ApplicationContext context  throws BeansException           CONTEXT   context             public static Object getBean String beanName            return CONTEXT getBean beanName

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There are various ways to achieve the same  Below are some commonly used ways in spring-  Using PropertyPlaceholderConfigurer  Using PropertySource  Using ResourceBundleMessageSource  Using PropertiesFactoryBean and many more                           Assuming ds type is key in your property file   Using PropertyPlaceholderConfigurer Register PropertyPlaceholderConfigurer bean-  lt context property-placeholder location  quot classpath path filename properties quot   gt   or  lt bean class  quot org springframework beans factory config PropertyPlaceholderConfigurer quot  gt     lt property name  quot locations quot  value  quot classpath path filename properties quot   gt  lt  property gt   lt  bean gt   or  Configuration public class SampleConfig     Bean  public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer       return new PropertySourcesPlaceholderConfigurer        set locations as well        After registering PropertySourcesPlaceholderConfigurer  you can access the value-  Value  quot   ds type  quot  private String attr     Using PropertySource In the latest spring version you don t need to register PropertyPlaceHolderConfigurer with  PropertySource  I found a good link to understand version compatibility-  PropertySource  quot classpath path filename properties quot    Component public class BeanTester        Autowired Environment environment       public void execute             String attr   this environment getProperty  quot ds type quot              Using ResourceBundleMessageSource Register Bean-  lt bean id  quot messageSource quot  class  quot org springframework context support ResourceBundleMessageSource quot  gt     lt property name  quot basenames quot  gt       lt list gt         lt value gt classpath path filename properties lt  value gt       lt  list gt     lt  property gt   lt  bean gt   Access Value-   ApplicationContext context  getMessage  quot ds type quot   null  null    or  Component public class BeanTester        Autowired MessageSource messageSource       public void execute             String attr   this messageSource getMessage  quot ds type quot   null  null             Using PropertiesFactoryBean Register Bean-  lt bean id  quot properties quot        class  quot org springframework beans factory config PropertiesFactoryBean quot  gt     lt property name  quot locations quot  gt       lt list gt         lt value gt classpath path filename properties lt  value gt       lt  list gt     lt  property gt   lt  bean gt   Wire Properties instance into your class-  Component public class BeanTester        Autowired Properties properties       public void execute             String attr   properties getProperty  quot ds type quot

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If you need to manually read a properties file without using  Value   Thanks for the well written page by Lokesh Gupta   Blog    package utils  import org slf4j Logger  import org slf4j LoggerFactory  import org springframework util ResourceUtils   import java io FileInputStream  import java io IOException  import java io InputStream  import java util Properties  import java io File    public class Utils        private static final Logger LOGGER   LoggerFactory getLogger Utils class getName          public static Properties fetchProperties            Properties properties   new Properties            try               File file   ResourceUtils getFile  classpath application properties                InputStream in   new FileInputStream file               properties load in             catch  IOException e                LOGGER error e getMessage                       return properties

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In configuration class   Configuration  PropertySource  classpath  com myco app properties   public class AppConfig       Autowired    Environment env       Bean    public TestBean testBean            TestBean testBean   new TestBean           testBean setName env getProperty  testbean name            return testBean

[spring] How to read values from properties file?

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