Java DataInputStream接收到的数据不准确

这个问题真让我头疼。非常简单的场景。使用DataInputStream通过TCP发送和接收文件

这是写入方法

private boolean send(File file)
{
    try {
        FileInputStream fileIStream = new FileInputStream(file);
        BufferedInputStream bufferedIStream = new BufferedInputStream(fileIStream);
        DataInputStream dataIStream = new DataInputStream(bufferedIStream);
        byte [] buffer = new byte [sendBufferSize];

        dataOStream.writeInt(ID);
        dataOStream.writeUTF(file.getName());
        dataOStream.writeLong(file.length());
        dataOStream.writeUTF(data1);
        dataOStream.writeUTF(data2);
        dataOStream.writeInt(number1);
        //dataOStream.flush(); tried to flush here if writing data might be the problem

        int write, total=0;
        //Starting to send
        while((write = dataIStream.read(buffer)) >= 0)
        {
            dataOStream.write(buffer);
            total+=write;
            System.out.println("size: " + file.length() + "  write: " + write + "  total: " + total);
        }
        dataIStream.close();
        dataOStream.flush();
        return true;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

这就是输出

size: 1830918  write: 8192  total: 8192
size: 1830918  write: 8192  total: 16384  
size: 1830918  write: 8192 total: 24576  
size: 1830918  write: 8192  total: 32768  
size: 1830918  write: 8192  total: 40960  
size: 1830918  write: 8192  total: 49152 
size: 1830918  write: 8192  total: 57344  
size: 1830918  write: 8192  total: 65536  
...............  
............... 
...............  
size: 1830918  write: 8192  total: 1802240  
size: 1830918  write: 8192  total: 1810432  
size: 1830918  write: 8192  total: 1818624  
size: 1830918  write: 8192  total: 1826816  
size: 1830918  write: 4102  total: 1830918

到目前为止，一切似乎都很好。问题在于读取数据

我是这样读的

private boolean receiveBinary()
{
    try {
        final int ID = dataIStream.readInt();

            final String fileName = dataIStream.readUTF();
            final long fileSize = dataIStream.readLong();
            final String data1 = dataIStream.readUTF();
            final String data2 = dataIStream.readUTF();
            final int number1 = dataIStream.readInt();
            //I printed out these data and everything is fine until here. No corruption or no missing.

            int read, totalRead = 0;
            File outputFile = createFile();
            OutputStream outputStream = new FileOutputStream(outputFile);

            try {
                byte [] readBuffer = new byte[readBufferSize];
                while ((read = dataIStream.read(readBuffer)) > 0) {
                    outputStream.write(readBuffer);
                    readBuffer = new byte[readBufferSize];
                    totalRead += read;
                    System.out.println("size: " + fileSize + "  read: " + read + "  total: " + totalRead);
                    if (totalRead == fileSize) {
                        outputStream.flush();
                        outputStream.close();
                        break;
                    }
                }
                return true;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }
    }
    catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

这是接收到的输出

size: 1830918  read: 34228  total: 34228
size: 1830918  read: 2920  total: 37148
size: 1830918  read: 3812  total: 40960
size: 1830918  read: 1460  total: 42420
size: 1830918  read: 6732  total: 49152
size: 1830918  read: 2920  total: 52072
size: 1830918  read: 5272  total: 57344
size: 1830918  read: 8192  total: 65536
size: 1830918  read: 8192  total: 73728
size: 1830918  read: 1460  total: 75188
size: 1830918  read: 6732  total: 81920
size: 1830918  read: 1460  total: 83380
size: 1830918  read: 6732  total: 90112
size: 1830918  read: 1460  total: 91572
size: 1830918  read: 6732  total: 98304
size: 1830918  read: 8192  total: 106496
size: 1830918  read: 1460  total: 107956
size: 1830918  read: 1460  total: 109416
size: 1830918  read: 5272  total: 114688
size: 1830918  read: 1460  total: 116148
size: 1830918  read: 6732  total: 122880
size: 1830918  read: 8192  total: 131072
size: 1830918  read: 8192  total: 139264
size: 1830918  read: 8192  total: 147456
size: 1830918  read: 1460  total: 148916
size: 1830918  read: 6732  total: 155648
size: 1830918  read: 8192  total: 163840
size: 1830918  read: 8192  total: 172032
size: 1830918  read: 8192  total: 180224
size: 1830918  read: 1460  total: 181684
size: 1830918  read: 6732  total: 188416
size: 1830918  read: 8192  total: 196608
size: 1830918  read: 8192  total: 204800
size: 1830918  read: 1460  total: 206260
size: 1830918  read: 6732  total: 212992
size: 1830918  read: 8192  total: 221184
size: 1830918  read: 8192  total: 229376
size: 1830918  read: 8192  total: 237568
size: 1830918  read: 8192  total: 245760
size: 1830918  read: 1460  total: 247220
size: 1830918  read: 6732  total: 253952
size: 1830918  read: 1460  total: 255412
size: 1830918  read: 6732  total: 262144
size: 1830918  read: 8192  total: 270336
size: 1830918  read: 1460  total: 271796
size: 1830918  read: 6732  total: 278528
size: 1830918  read: 1460  total: 279988
size: 1830918  read: 6732  total: 286720
size: 1830918  read: 8192  total: 294912
size: 1830918  read: 1460  total: 296372
size: 1830918  read: 6732  total: 303104
size: 1830918  read: 16384  total: 319488
size: 1830918  read: 8192  total: 327680
size: 1830918  read: 1460  total: 329140
size: 1830918  read: 6732  total: 335872
size: 1830918  read: 8192  total: 344064
size: 1830918  read: 1460  total: 345524
size: 1830918  read: 6732  total: 352256
size: 1830918  read: 8192  total: 360448
size: 1830918  read: 8192  total: 368640
size: 1830918  read: 8192  total: 376832
size: 1830918  read: 8192  total: 385024
size: 1830918  read: 8192  total: 393216
size: 1830918  read: 8192  total: 401408
size: 1830918  read: 8192  total: 409600
size: 1830918  read: 1460  total: 411060
size: 1830918  read: 6732  total: 417792
size: 1830918  read: 8192  total: 425984
size: 1830918  read: 8192  total: 434176
size: 1830918  read: 8192  total: 442368
size: 1830918  read: 8192  total: 450560
size: 1830918  read: 8192  total: 458752
size: 1830918  read: 8192  total: 466944
size: 1830918  read: 8192  total: 475136
size: 1830918  read: 1460  total: 476596
size: 1830918  read: 6732  total: 483328
size: 1830918  read: 1460  total: 484788
size: 1830918  read: 6732  total: 491520
size: 1830918  read: 1460  total: 492980
size: 1830918  read: 6732  total: 499712
size: 1830918  read: 8192  total: 507904
size: 1830918  read: 8192  total: 516096
size: 1830918  read: 8192  total: 524288
size: 1830918  read: 8192  total: 532480
size: 1830918  read: 8192  total: 540672
size: 1830918  read: 8192  total: 548864
size: 1830918  read: 1460  total: 550324
size: 1830918  read: 6732  total: 557056
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size: 1830918  read: 6732  total: 565248
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size: 1830918  read: 6732  total: 573440
size: 1830918  read: 8192  total: 581632
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size: 1830918  read: 8192  total: 606208
size: 1830918  read: 8192  total: 614400
size: 1830918  read: 1460  total: 615860
size: 1830918  read: 6732  total: 622592
size: 1830918  read: 8192  total: 630784
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size: 1830918  read: 8192  total: 647168
size: 1830918  read: 8192  total: 655360
size: 1830918  read: 8192  total: 663552
size: 1830918  read: 8192  total: 671744
size: 1830918  read: 1460  total: 673204
size: 1830918  read: 6732  total: 679936
size: 1830918  read: 1460  total: 681396
size: 1830918  read: 1460  total: 682856
size: 1830918  read: 1460  total: 684316
size: 1830918  read: 3812  total: 688128
size: 1830918  read: 8192  total: 696320
size: 1830918  read: 1460  total: 697780
size: 1830918  read: 6732  total: 704512
size: 1830918  read: 8192  total: 712704
size: 1830918  read: 8192  total: 720896
size: 1830918  read: 8192  total: 729088
size: 1830918  read: 8192  total: 737280
size: 1830918  read: 8192  total: 745472
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size: 1830918  read: 8192  total: 761856
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size: 1830918  read: 8192  total: 778240
size: 1830918  read: 8192  total: 786432
size: 1830918  read: 8192  total: 794624
size: 1830918  read: 8192  total: 802816
size: 1830918  read: 1460  total: 804276
size: 1830918  read: 6732  total: 811008
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size: 1830918  read: 1460  total: 828852
size: 1830918  read: 6732  total: 835584
size: 1830918  read: 8192  total: 843776
size: 1830918  read: 1460  total: 845236
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size: 1830918  read: 5272  total: 851968
size: 1830918  read: 8192  total: 860160
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size: 1830918  read: 8192  total: 876544
size: 1830918  read: 1460  total: 878004
size: 1830918  read: 6732  total: 884736
size: 1830918  read: 8192  total: 892928
size: 1830918  read: 1460  total: 894388
size: 1830918  read: 6732  total: 901120
size: 1830918  read: 4380  total: 905500
size: 1830918  read: 1460  total: 906960
size: 1830918  read: 2352  total: 909312
size: 1830918  read: 8192  total: 917504
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size: 1830918  read: 1460  total: 927156
size: 1830918  read: 6732  total: 933888
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size: 1830918  read: 6732  total: 942080
size: 1830918  read: 8192  total: 950272
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size: 1830918  read: 1460  total: 984500
size: 1830918  read: 6732  total: 991232
size: 1830918  read: 8192  total: 999424
size: 1830918  read: 1460  total: 1000884
size: 1830918  read: 1460  total: 1002344
size: 1830918  read: 5272  total: 1007616
size: 1830918  read: 8192  total: 1015808
size: 1830918  read: 8192  total: 1024000
size: 1830918  read: 8192  total: 1032192
size: 1830918  read: 8192  total: 1040384
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size: 1830918  read: 1460  total: 1082804
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size: 1830918  read: 5272  total: 1089536
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size: 1830918  read: 8192  total: 1105920
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size: 1830918  read: 8192  total: 1171456
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size: 1830918  read: 8192  total: 1196032
size: 1830918  read: 1460  total: 1197492
size: 1830918  read: 6732  total: 1204224
size: 1830918  read: 1460  total: 1205684
size: 1830918  read: 1460  total: 1207144
size: 1830918  read: 5272  total: 1212416
size: 1830918  read: 8192  total: 1220608
size: 1830918  read: 8192  total: 1228800
size: 1830918  read: 8192  total: 1236992
size: 1830918  read: 4380  total: 1241372
size: 1830918  read: 3812  total: 1245184
size: 1830918  read: 8192  total: 1253376
size: 1830918  read: 1460  total: 1254836
size: 1830918  read: 6732  total: 1261568
size: 1830918  read: 8192  total: 1269760
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size: 1830918  read: 1460  total: 1287604
size: 1830918  read: 6732  total: 1294336
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size: 1830918  read: 6732  total: 1310720
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size: 1830918  read: 6732  total: 1343488
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size: 1830918  read: 6732  total: 1703936
size: 1830918  read: 8192  total: 1712128
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size: 1830918  read: 1460  total: 1738164
size: 1830918  read: 6732  total: 1744896
size: 1830918  read: 1460  total: 1746356
size: 1830918  read: 1460  total: 1747816
size: 1830918  read: 5272  total: 1753088
size: 1830918  read: 8192  total: 1761280
size: 1830918  read: 8192  total: 1769472
size: 1830918  read: 1460  total: 1770932
size: 1830918  read: 1460  total: 1772392
size: 1830918  read: 5272  total: 1777664
size: 1830918  read: 1460  total: 1779124
size: 1830918  read: 1460  total: 1780584
size: 1830918  read: 5272  total: 1785856
size: 1830918  read: 8192  total: 1794048
size: 1830918  read: 8192  total: 1802240
size: 1830918  read: 8192  total: 1810432
size: 1830918  read: 8192  total: 1818624
size: 1830918  read: 1460  total: 1820084
size: 1830918  read: 6732  total: 1826816
size: 1830918  read: 1460  total: 1828276
size: 1830918  read: 1460  total: 1829736
size: 1830918  read: 5272  total: 1835008

在客户端，它显示文件已发送。但服务器端仍在等待 当我比较filesize==totalRead时，问题是， 为什么服务器收到的比我发送的多？这不正是问题所在吗 要接收的字节数相同吗

奇怪的是，当我终止应用程序时，写入的文件约为16MB。我处理接收部件的方式肯定有问题。我需要一些帮助

编辑 关于将16MB写入输出，我刚刚想到了。不管我读了多少，我都在写整个缓冲区。所以我修改了上面的行

outputStream.write(readBuffer);

像这样

outputStream.write(readBuffer, 0, read);

---

我的问题仍然存在。我如何不接收字节数？我收到的比发送的多。有什么线索吗？

你的复制循环都错了。发送循环应如下所示：

while ((count = in.read(buffer)) > 0)
{
    out.write(buffer, 0, count);
}

否则，您至少会在文件末尾写入垃圾，其他时间也可能如此

您的接收循环需要在读取正确的字节数后停止，因此它有点复杂：

while (total < length && (count = in.read(buffer, 0, (int)Math.min(buffer.length, length-total))) > 0)
{
    out.write(buffer, 0, count);
    total += count;
}

while（total0）
{
out.write（缓冲区，0，计数）；
总数+=计数；
}

---

E&OE

您是否对写入方法进行了相同的更改<代码>dataOStream.write（缓冲区，0，写入）@Alex就是这样。真的谢谢。你知道吗，考虑到这个问题的最后一个答案，我认为拥有一个银行账户对你来说会很好。我只是瞎了眼，看不见我的发送部分。哦还有一件事，在接收部分，对于读取（缓冲区，0，数量），我们不能期望读取相同数量的字节，因为在发送中我毕竟使用了flush吗？TCP保证交付和订单，这不是没有必要使用min（number，number）吗？为什么不直接读取（缓冲区）？flush（）与此无关。必须准确读取预期的字节数，不能再读取更多。如果不使用Math.min（）表达式，您将过度阅读，这正是您报告的问题。通读代码，找出为什么所有东西都在它所在的位置。它经过了非常好的测试，并且出现在这里的几十个答案中。然后我可以简单地删除接收while循环中的if条件，对吗？有些人说（在其他答案中）阅读和发送都不需要刷新。所以我应该只关闭？正确，删除if，然后在末尾关闭。“if”的作用与

while

条件和

Math.min（）

表达式的作用相同，但做得不正确，而且为时已晚。请更正此问题，不要使用可能遇到整数溢出的

Math.min（）

。