How to read properties file in java

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In this post , we will see how to read properties file in java.

Properties files are used in java projects to externalise configuration, for example, database settings.

Java uses Properties class to store the above key-values pair. Properties.load() method is very convenient to load properties file in form of key-values pairs.

Properties file looks something like this.

There are two ways you can do it.

Read properties file from System

In this, you need to read properties file from system path. Here I am putting properties file in root level of project.

java code:

When you run above program, you will get following output:

Reading from properties file
—————————–
host : localhost
username : java2blog
password : java123
—————————–

Read properties file from classpath

You can read properties file to classpath too. You have $project/src as default classpath as this src folder will be copied to classes. You can put it in $project/srcfolder and read it from there.

you need to use this.getClass().getResourceAsStream("/config.properties"); to read it from classpath.

When you run above program, you will get following output:

Reading from properties file
—————————–
host : localhost
username : java2blog
password : java123
—————————–

That’s all about how to read properties file in java

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