replace properties of properties file

Question

I have a cluster.properties file with contents :

master=1.2
first.node=
second.node=10.20.30.30

I want to replace these properties with some different value. How can I do this this?

My method look like replaceProp(String filePath, String prop, String newValue)

Do you know how to actually read and write to a file? It should be easy if you do. If you don't, there are countless tutorials/SO questions one Google search away... — bcsb1001, Sep 07 '15 at 15:52
Thanks! I got some answer at http://stackoverflow.com/questions/15337409/updating-property-value-in-properties-file-without-deleting-other-values — Shashi Ranjan, Sep 07 '15 at 16:03

score 0 · Answer 1 · answered Sep 07 '15 at 16:05

0

One way of doing this could be:

Read Properties:

Properties properties = new Properties();
FileInputStream fis=new FileInputStream("cluster.properties");
properties.load(fis);
fis.close();

Replace:

properties.set("master", "1.2.3")
...

Save back:

FileOutputStream fos=new FileOutputStream("cluster.properties");
properties.store(fos,"Some meaningfule comments");
fos.close();

answered Sep 07 '15 at 16:05

Sandeep Jindal

Closing streams should be done in a finally block/ try-with-resources statement. – Puce Sep 07 '15 at 16:22

1 Answers1