CODEWITHSUNDEEP
java
TT52
TT52

Reputation: 13

How do I utilize a config file with my Java program?

I'm trying to use a config file that holds a list of hosts/websites and a time frequency for each one.

ex.

google.com  15s 
yahoo.com   10s

My objective is to ping each website from the config file at every time period (15 secs).

Should I just read the config file and input the hosts/time into separate arrays?

Seems like there is a more efficient method...

Upvotes: 0

Views: 129

Answers (2)

James P.
James P.

Reputation: 19607

Here is a quick rundown of how to use a properties file.

You can create a file with the extension .properties (if under Windows make sure you have file extensions displayed) in the root of your project. The properties can be defined as pairs:

google.com=15
yahoo.com=10

In Java,

To get the ping time of a particular URL:

final String path = "config.properties";

Properties prop = new Properties();

int pingTimeGoogle = prop.load(new FileInputStream(path)).getProperty("google.com");

To cycle through the properties and get the whole list:

final String path = "config.properties";

Properties props = new Properties().load(new FileInputStream(path));
Enumeration e = props.propertyNames();

while (e.hasMoreElements()) {
    String key = (String) e.nextElement();
    System.out.println(key + "=" + props.getProperty(key));
}

Edit: And here's a handy way to transform properties into a Map (Properties implements the Map interface):

final String path = "config.properties";

Properties props = new Properties().load(new FileInputStream(path));

Map<String, Integer> pingUrlTimes = new HashMap<String, Integer>((Map) props);

Cycling through the HashMap can be done like this:

Iterator iterator = pingUrlTimes.keySet().iterator(); // Get Iterator

while (iterator.hasNext()) {
    String key = (String) iterator.next();

    System.out.println(key + "=" +  pingUrlTimes.get(key) );
}

Upvotes: 0

duffymo
duffymo

Reputation: 308753

Why use two arrays when the two items are so intimately related?

I'd put them into a Map:

Map<String, Integer> pingUrlTimes = new HashMap<String, Integer>();
pingUrlTimes.put("google.com", 15);
pingUrlTimes.put("yahoo.com", 10);

int pingTime = pingUrlTimes.get("google.com");

Upvotes: 2

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