通过JAVA SDK分块上传大附件，只有最后一次上传了（如4.36M的附件，分块每次上传1M，最终上传的大小只有0.36M，且该文件损坏无法打开），具体代码如下：

File file = new File(filePath);

FileInputStream fileInputStream = new FileInputStream(file);

int maxChunkSize = 1024 * 1024; // 定义每次转换的最大块大小，例如1M

byte[] chunk = new byte[maxChunkSize];

int bytesRead;

String fileId = "";

bytesRead = fileInputStream.read(chunk);

boolean isLast = false;

if(bytesRead < maxChunkSize){

isLast = true;

}

while (bytesRead != -1) {

byte[] subArray = new byte[bytesRead];

System.arraycopy(chunk, 0, subArray, 0, bytesRead);

// 将字节转换为Base64编码

String encodedString = Base64.getEncoder().encodeToString(subArray);

JSONObject job = new JSONObject(new LinkedHashMap());

job.put("FileName", fileName);

job.put("FEntryKey", "");

job.put("FormId", "PUR_PurchaseOrder");

job.put("IsLast", isLast);

job.put("InterId", InterId);

job.put("BillNO", fBillNo);

job.put("AliasFileName", fileName);

job.put("FFileId", fileId);

job.put("SendByte", encodedString);

String resultJson = api.attachmentUpload(job.toString());

JSONObject job1 = JSONObject.parseObject(resultJson);

job1 = JSONObject.parseObject(job1.getString("Result").toString());

fileId = job1.getString("FileId");

bytesRead = fileInputStream.read(chunk);

if(bytesRead < maxChunkSize) {

isLast = true;

}

产品问题大附件如何分块上传

50 产品问题 大附件如何分块上传