CODEWITHSUNDEEP
javaconfiguration-files
devsda
devsda

Reputation: 4222

How to read a configuration file in Java

I am doing a project to build thread pooled web server, in which I have to set

One way is to hard code all these variables in the code, that I did. But professionally it is not good.

Now, I want to make one configuration file, in which I put all these data, and at the run time my code fetches these.

How can I make configuration file for the above task ?

Upvotes: 57

Views: 207871

Answers (3)

Fakhredin Gholamizadeh
Fakhredin Gholamizadeh

Reputation: 332

app.config

app.name=Properties Sample Code
app.version=1.09

Source code:

Properties prop = new Properties();
String fileName = "app.config";
try (FileInputStream fis = new FileInputStream(fileName)) {
    prop.load(fis);
} catch (FileNotFoundException ex) {
    ... // FileNotFoundException catch is optional and can be collapsed
} catch (IOException ex) {
    ...
}
System.out.println(prop.getProperty("app.name"));
System.out.println(prop.getProperty("app.version"));

Output:

Properties Sample Code
1.09

Upvotes: 33

MadProgrammer
MadProgrammer

Reputation: 347194

It depends.

Start with Basic I/O, take a look at Properties, take a look at Preferences API and maybe even Java API for XML Processing and Java Architecture for XML Binding

And if none of those meet your particular needs, you could even look at using some kind of Database

Upvotes: 14

prasanth
prasanth

Reputation: 3602

Create a configuration file and put your entries there. 

SERVER_PORT=10000     
THREAD_POOL_COUNT=3     
ROOT_DIR=/home/

You can load this file using Properties.load(fileName) and retrieved values you get(key);

Upvotes: 14

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