How to read values from configuration properties file in java
For example, I will create 3 files.
1. main.properties file: .properties is a file extension for files mainly used in Java related technologies to store the configurable parameters of an application. Each parameter is stored as a pair of strings, one storing the name of the parameter (called the key/map), and the other storing the value.
2. GetPropertyValues.java: This java file will have implementation to get property values from property file.
3. ReadConfigMain.java: This java file will have main method and will use to call method of GetPropertyValues class.
Step 1: Create main.properties file
1. If you have spring project, create main.properties file under src/main/resources. Else, create Folder “resources” under Java Resources folder if your project doesn’t have it and than create main.properties file under /Java Resources/resources/.
2. Create main.properties file as given below:
main.propertis file content:
queue_name=QUEUE
queue_manager=QM
queue_hostname=localhost
queue_port=1414
Step 2: Create ReadConfigMain java class
package engineernitesh.blogspot.com;
import java.io.IOException;
public class ReadConfigMain {
public static void main(String[] args) throws IOException {
GetPropertyValues properties = new GetPropertyValues();
properties.getPropValues();
}
}
Step 3: Create GetPropertyValues java class
package engineernitesh.blogspot.com;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Properties;
public class GetPropertyValues {
String result = "";
InputStream inputStream;
public String getPropValues() throws IOException {
try {
Properties prop = new Properties();
String propFileName = "main.properties";
inputStream = getClass().getClassLoader().getResourceAsStream(propFileName);
if (inputStream != null) {
prop.load(inputStream);
} else {
throw new FileNotFoundException("property file '" + propFileName + "' not found in the classpath");
}
// get the property value and print it out
String queue_name = prop.getProperty("queue_name");
String queue_manager = prop.getProperty("queue_manager");
String queue_hostname = prop.getProperty("queue_hostname");
String queue_port = prop.getProperty("queue_port");
result = queue_hostname+":" + queue_port + "\ " + queue_manager + "\ " + queue_name;
System.out.println("result: "+result);
} catch (Exception e) {
System.out.println("Exception: " + e);
} finally {
inputStream.close();
}
return result;
}
}
