You just need to autowire the ResourceLoader and then call the getResource(„somePath“) method. With Java you can use the classLoader of the current thread and try to load the file, but the Spring Framework provides you with much more elegant solution like the ResourceLoader. Therefore I needed to load the file and create a DatabaseReader object, which is stored in the server memory.īeneath you will find the solutions for loading files in a WAR and JAR. If your config.properties file reside on your same package of your java class then just use, InputStream inputStream this.getClass ().getClassLoader ().getResourceAsStream ('config. In my case I was using a MAXMIND GeoLite2 database for geolocation retrieval. When creating a Spring Boot web app, it is sometimes necessary to load files from the classpath, for example if data is only available as a file. Example of loading a file from the resource directory / classpath in Spring Boot (WAR).Properties.load() method is very convenient to load properties file in form of key-values pairs. Java uses Properties class to store the above key-values pair. The file loads the properties lazily, but only once.
The class PropertiesCache acts as a cache for loaded properties. Listing 2: Writing the Properties to Text File //Example 02: Store Properties to MyApp.Properties Path PropertyFile = Paths.get( "MyApp. Properties files are used in java projects to externalise configuration, for example, database settings. In the given example, we are reading the properties from a file app.properties which is in the classpath. To organize a group of properties use comment heading and a blank line at the end of the group. Java allows you to read the value of the property by providing its name which makes it easy to access configuration settings.To place comment, prefix the line with # or ! symbol.This is a common task for a developer to maintain project configuration data or settings in an. You can use this PropertiesFileReader utility class to load 'config.properties' file and it provides getValue () API to retrieve a property value by key. To have = or: in key and/or value, use the escape char \. This post gives you PropertiesFileReader utility class to use in your Java/Java EE projects.Use the “=” or “:” as a separator between Key & Value.Key and Value pairs can be created one per line.new Properties().load(('file.properties')) Given that Properties extends Hashtable you can iterate over the values in the same manner as you would in a Hashtable. The “store()” method of the Java’s Properties Class Persists Key-Value pair to Disc and the “load()” method will read the persisted information from the disc and forms the Key-Value Pair If you put the properties file in the same package as class Foo, you can easily load it with. Listing 1: Creating Application Settings //Example 01: Create List of Property Values Properties AppProps = new Properties() tProperty( "Backcolor", "White") tProperty( "Forecolor", "Blue") tProperty( "FontSize", "12")
So, in the code snippet, we created three application settings and stored that in a Properties object called AppProps. Here, "FontSize " is the Key (Marked as 2) which is passed as First Parameter and 12 is the value for it which is passed as second parameter (Marked as 3). tProperty(user.name, admin) tProperty(user.age, 25) We will use store method of the Properties class, to write properties object to a file. Procedure to dump properties to property file in java. Field names are in standard Java camel case, while the properties are in kebab case. For example, the third property we are adding is "FontSize " and the Size of the font is 12. We will use Properties class to set properties file. Reading Simple Properties Our class is marked Configuration. The two parameters passed to it is "Key and Value" pair. Later, the Value can be retrieved by providing the corresponding Key. The "setProperties()" method accepts two strings and forms Key-Value Pair.
Once the object is on hand, we are storing three properties by calling its "setProperty()" method. Here, first, we are creating a Java Properties object called AppProps which will hold application properties (Marked as 1).