IPFS sample program to add and get file.

IPFSSample.java

package com.dev.ipfs.sample;

import java.io.IOException;

import io.ipfs.api.IPFS;
import io.ipfs.api.MerkleNode;
import io.ipfs.api.NamedStreamable;
import io.ipfs.multihash.Multihash;

public class IPFSSample {

    public static void main(String[] args) throws IOException {

        IPFS ipfs = new IPFS("/ip4/127.0.0.1/tcp/5001");

        // ipfs.refs.local();

        NamedStreamable.ByteArrayWrapper file = new NamedStreamable.ByteArrayWrapper(
                "hello.txt", "my first string".getBytes());
         MerkleNode addResult = ipfs.add(file).get(0);

        // System.out.println(addResult.hash.toBase58());

        Multihash filePointer = Multihash
                .fromBase58("QmXCsyADdT78FYqyjdzRNmVHBJS1CmuSYxxD3vnmR5U8ob");
        byte[] fileContents = ipfs.cat(filePointer);
        
        String str = new String(fileContents);

        System.out.println(str);

    }

}