ipfs问题汇总

    
        
            jitpack.io
            https://jitpack.io
        
    

        
            com.github.ipfs
            java-ipfs-api
            1.3.3
        

package com.chainmaker.nft.service;

import io.ipfs.api.IPFS;
import io.ipfs.api.MerkleNode;
import io.ipfs.api.NamedStreamable;
import io.ipfs.multihash.Multihash;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

@Service
@Slf4j
public class ipfsService {

    private IPFS ipfs;

    public void IPFSOpe(String ip) {
        this.ipfs = new IPFS(ip);
    }

    public void upload(String upaddr) throws IOException {
        //保存上传文件
        NamedStreamable.FileWrapper savefile = new NamedStreamable.FileWrapper(new File(upaddr));
        MerkleNode result = ipfs.add(savefile).get(0);
        System.out.println(result.toString());


    }
    public void cat(String hash) throws IOException {
        //参数为文件 hash
        Multihash filePointer = Multihash.frombase58(hash);
        byte[] fileContents = ipfs.cat(filePointer);
        System.out.println(new String(fileContents));
    }
    public void download(String hash, String downaddr) throws IOException {
        //参数为文件 hash
        Multihash filePointer = Multihash.frombase58(hash);
        byte[] fileContents = ipfs.cat(filePointer);

        File downloadfile = new File(downaddr);
        if(!downloadfile.exists()) {
            downloadfile.createNewFile();
        }
        FileOutputStream fop = new FileOutputStream(downloadfile);
        fop.write(fileContents);
        fop.flush();
        fop.close();
    }

    public static void main(String[] args) throws IOException {
        String ip = "/ip4/127.0.0.1/tcp/5001";
        String upaddr = "/root/lyzdfintech.com/image/test.log";
//        String downaddr = "/root/lyzdfintech.com/image/test1.log";
//        String hash = "QmNkspXsCVxsjVBG3FCoBJVfcD5zT15K3Uzo9J14NnLQru"; //test.txt
        //String hash = "QmNkspXsCVxsjVBG3FCoBJVfcD5zT15K3Uzo9J14NnLQru"; //java.txt
        ipfsService test = new ipfsService();
        test.IPFSOpe(ip);
        test.upload(upaddr);
        //test.cat(hash);
//        test.download(hash, downaddr);

    }
}

 java.lang.RuntimeException: Server returned status: 404 with body: and Trailer header: null

解决方案：
将8080 Gateway 改为API 5001

IPFS ipfs = new IPFS(“/ip4/127.0.0.1/tcp/8080”);
修改为
IPFS ipfs = new IPFS(“/ip4/127.0.0.1/tcp/5001”);