How to read a file in AWS Lambda Function written in Java ?

Question

I have written an AWS Lambda Handler as below :

package com.lambda;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.r         


        

Answer 1

If the file in located under resources directory, then the following solution should work:

String fileName = "resources/config.json";

Path path = Paths.get(this.getClass().getResource("/").toURI());
Path resourceLocation = path.resolve(fileName);

try(InputStream configStream = Files.newInputStream(resourceLocation)) {
            //use your file stream as you need.
}

Here the most important part is "resources/config.json", it must not be "/resources/config.json", because the file location is /var/task/resources/config.json in lambda, I checked.

Hope this helps who still face problem in reading file in aws lambda.