流的方式上传文件 about fastdfs-client-java

[0312birdzhang]

已解决，用modify_file1，第一次先上传一个文件，后面逐渐用偏移添加

[0312birdzhang]

贴一下主要的代码吧，或许会有需要的

/**
     * 大文件分块上传
     * @author debo.zhang
     * @param in
     * @param upload
     * @param remoteid
     * @throws IOException
     * @throws NoSuchAlgorithmException 
     */
    public String bigBufferUpload(InputStream in,boolean upload,String remoteid,MessageDigest md) throws IOException, NoSuchAlgorithmException{
        byte[] buffer = new byte[1024];
        ByteArrayOutputStream ous = null;
        NameValuePair[] meta = null;
        long buffer_length = 0;
        boolean read_end = false;
        ous = new ByteArrayOutputStream();

        while(true){
            //一次400M上传，根据jvm虚拟机大小调整，不要设置太小导致频繁跟fastdfs交互
            if(buffer_length > 1024 * 1024 * 400){
                break;
            }
            int r = in.read(buffer);
            if(r == -1){
                read_end = true;
                break;
            }

            ous.write(buffer, 0, r);
            buffer_length += r;

            md.update(buffer, 0, r);
        }

        if(upload){
            Ret ret = FastDFSService.uploadAppendfile(ous.toByteArray(),filetype,meta);
            if(ret != ResultKit.fail()){
                remoteid = ret.get(Constant.DATA);
                upload = false;
                if(!read_end){
                    bigBufferUpload(in, false, remoteid,md);
                }else{
                    byte[] digest = md.digest();
                    filemd5 = new String(Hex.encodeHex(digest));
                }
            }
        }else{
            byte[] buff = ous.toByteArray();
            long filesize = FastDFSService.getFileInfo(remoteid).getFileSize();
            FastDFSService.modifyAppendFile(remoteid, filesize, buff, 0,buff.length);
            if(!read_end){
                bigBufferUpload(in, false, remoteid,md);
            }else {
                byte[] digest = md.digest();
                filemd5 = new String(Hex.encodeHex(digest));
            }
        }
        return remoteid;
    }

然后用下面代码调用

public void upload(){
        HttpServletRequest req = getRequest();
        boolean isMultipart = ServletFileUpload.isMultipartContent(req);
        JsonMessageBean msg = new JsonMessageBean();
        if(isMultipart){
            ServletFileUpload upload = new ServletFileUpload();
            try {
                FileItemIterator iter = upload.getItemIterator(req);
                while (iter.hasNext()) {
                    FileItemStream item = iter.next();
                    input  = item.openStream();
                    if(item.isFormField()){
                        String fileName = item.getFieldName();
                        String value = Streams.asString(input);
                        if("filename".equals(fileName)){
                            this.filename = value;
                        }else if("uri".equals(fileName)){
                            this.uri = value;
                        }else if("filetype".equals(fileName)){
                            this.filetype = value;
                        }else if ("appid".equals(fileName)) {
                            this.appid = value;
                        }else if ("appzone".equals(fileName)) {
                            this.appzone = value;
                        }else if ("appsecret".equals(fileName)) {
                            this.appsecret = value;
                        }
                    }
                    // Handle a multi-part MIME encoded file.
                    else {
                    MessageDigest md = MessageDigest.getInstance("MD5");
                    dfspath = bigBufferUpload(input, true, "",md);
                    System.out.println("calculated md5:"+filemd5);