1. maven pom 配置

#注意version，前面有小写字母v

        <dependency>
            <groupId>com.github.ipfs</groupId>
            <artifactId>java-ipfs-api</artifactId>
            <version>v1.2.0</version>
        </dependency>
		
		<repository>
            <id>jitpack.io</id>
            <url>https://jitpack.io</url>
        </repository>
		

1. JUnit test ``` #ip为服务器的Public IP

public class TestIpfs { private final IPFS ipfs = new IPFS(new MultiAddress(“/ip4/47.93.230.63/tcp/5001”)); private final Random r = new Random(33550336); // perfect

@Test
public void dag() throws IOException {
    byte[] object = "{\"data\":1234}".getBytes();
    MerkleNode put = ipfs.dag.put("json", object);

    Cid expected = Cid.decode("zdpuB2CbdLrUK5AgZusm4hraisDDDC135ugdmZWvMHhhsSYTb");

    Multihash result = put.hash;
    Assert.assertTrue("Correct cid returned", result.equals(expected));

    byte[] get = ipfs.dag.get(expected);
    Assert.assertTrue("Raw data equal", Arrays.equals(object, get));
}

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

} }

3. Couldn't connect to IPFS daemon at /api/v0/version

#1.阿里云服务器，安全规则开放4001，5001端口 #2.ipfs daemon 启动config配置更改 路径要设置为服务器的Private IP

$ cd ~/.ipfs

root@iZ2zeb5n81znirjwr3s29iZ:~/.ipfs# vi config

“Addresses”: { “Swarm”: [ “/ip4/0.0.0.0/tcp/4001”, “/ip6/::/tcp/4001” ], “Announce”: [], “NoAnnounce”: [], “API”: “/ip4/172.17.81.217/tcp/5001”, “Gateway”: “/ip4/127.0.0.1/tcp/8080” },

root@iZ2zeb5n81znirjwr3s29iZ:~/.ipfs# ipfs daemon

Initializing daemon… Swarm listening on /ip4/127.0.0.1/tcp/4001 Swarm listening on /ip4/172.17.81.217/tcp/4001 Swarm listening on /p2p-circuit/ipfs/QmYSnkoAntVQdmsByceEKwMS4XTokW66QxuiKrFeZ29CS8 Swarm announcing /ip4/127.0.0.1/tcp/4001 Swarm announcing /ip4/172.17.81.217/tcp/4001 API server listening on /ip4/172.17.81.217/tcp/5001 Gateway (readonly) server listening on /ip4/127.0.0.1/tcp/8080

4. add文件后，访问

#gateway 修改为0.0.0.0 Gateway (readonly) server listening on /ip4/0.0.0.0/tcp/8080

#http而非https http://47.93.230.63:8080/ipfs/QmQPzjhk9Eqy7vJWhaheyg4NiBxAz51WXUTsx92STBTs1j

```