How can I transform a .properties file during a Gr

问题:

As part of a deploy task in Gradle, I want to change the value of a property in foo.properties to point to a production database instead of a development database.

I'd rather not replace the whole file outright, as it's rather large and it means we would have to maintain two separate versions that only differ on a single line.

What is the best way to accomplish this?

回答1:

You can use the ant.propertyfile task:

    ant.propertyfile(
        file: "myfile.properties") {
        entry( key: "propertyName", value: "propertyValue")
        entry( key: "anotherProperty", operation: "del")
    }

回答2:

You should be able to fire off an ant "replace" task that does what you want: http://ant.apache.org/manual/Tasks/replace.html

ant.replace(file: "blah", token: "wibble", value: "flibble")

回答3:

A simple solution is to code a task that uses java.util.Properties to write the file. If you really want to incrementally update the file, you'll have to implement this on your own. Or maybe you find an Ant task that does what you want (all Ant tasks can be used as-is from Gradle). For best results, you should also declare the inputs and outputs of the task, so that Gradle only executes the tasks when the properties file needs to be changed.

回答4:

Create a properties object, then create the file object with the targeted properties file path, load the file on the properties object with load, set the desired property with setProperty, and save the changes with store.

def var = new Properties() 
File myfile = file("foo.properties");

var.load(myfile.newDataInputStream())
var.setProperty("db", "prod")
var.store(myfile.newWriter(), null)