Java property file comments

You can use properties files, YAML files, environment variables, and command-line arguments to externalize configuration. Properties File Properties files are used to keep 'N' number of properties in a single file to run the application in a different environment. In Spring Boot , properties are kept in the application.

The application. Spring Boot Framework comes with a built-in mechanism for application configuration using a file called application. Spring Boot provides various properties that can be configured in the application. It's a path inside your project where you place resources. During the build step, Maven will take files in there and place them in the appropriate place for you to use them in your runtime classpath , eg in an executable.

Spring boot provides command line configuration called spring. Here properties file name will be my-config. Another very simple way to read application properties is to use Value annotation.

Simply annotation the class field with Value annotation providing the name of the property you want to read from application. To read the value of app. Click in a text line, or select multiple lines of text.

What does uncomment mean? They are primarily there to supply additional information to make the code easier to read for humans. Follow the steps given below for commenting multiple using the terminal. Jesper de Jong. Java Cowboy. Properties class was not designed to keep the format of the properties file exactly the same. So if you load and save your properties file by using the methods in class Properties, the comments and formatting will not be preserved.

If this is really important, then you will have to read and write the file yourself with BufferedReader and FileWriter and parse and format the properties yourself. Sree : You are hijacking someone else's topic; please start your own topic next time It doesn't; that is not functionality of the Properties class.

You probably saw this when you were using Ant. See Also: setProperty java. String, java. String , defaults getProperty public String getProperty String key, String defaultValue Searches for the property with the specified key in this property list. The method returns the default value argument if the property is not found. Parameters: key - the hashtable key. Returns: an enumeration of all the keys in this property list, including the keys in the default property list.

Throws: ClassCastException - if any key in this property list is not a string. Properties whose key or value is not of type String are omitted. The returned set is not backed by the Properties object. Changes to this Properties are not reflected in the set, or vice versa. Returns: a set of keys in this property list where the key and its corresponding value are strings, including the keys in the default property list.

This method is useful for debugging. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. All rights reserved. Use is subject to license terms.

Also see the documentation redistribution policy. Object java. The Properties can be saved to a stream or loaded from a stream. Each key and its corresponding value in the property list is a string. Field Summary Fields Modifier and Type Field and Description protected Properties defaults A property list that contains default values for any keys not found in this property list. Reads a property list key and element pairs from the input character stream in a simple line-oriented format.

Loads all of the properties represented by the XML document on the specified input stream into this properties table. Returns an enumeration of all the keys in this property list, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list.

Writes this property list key and element pairs in this Properties table to the output stream in a format suitable for loading into a Properties table using the load InputStream method.

Writes this property list key and element pairs in this Properties table to the output character stream in a format suitable for using the load Reader method. Emits an XML document representing all of the properties contained in this table. Emits an XML document representing all of the properties contained in this table, using the specified encoding. Returns a set of keys in this property list where the key and its corresponding value are strings, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list.

Also, notice that when we use the same Properties object to load another property file, we should clear its contents using clear method. If we pass any key for which there is no value stored in the properties object, it returns null. Thank you so much for this. I was into this issue and tired to tinker around to check if its possible but couldnt get it done.

Now that i have seen the way you did it, thanks guys with regards. Your email address will not be published. Prev Java read file line by line. Next Enum in Java.