Question

这是我的测试代码，问题是resultLength！= original.length，结果数组与原始数组相同，压缩和解压缩后不应该这样吗？

public static void main(String[] args) {

        // generateTyreAlarmEvent()
        byte[] original = {10, 17, 97, 98, 99, 100, 101, 102, 103, 104, 105, 103, 107, 108, 109, 110, 111, 112, 113, 16, 2, 24, -50, -1, -113, -59, 5, 34, 20, 8, -35, 1, 16, 40, 24, -34, 1, 32, 60, 40, -33, 1, 48, 80, 56, -32, 1, 64, 100, 42, 16, 8, 2, 16, 1, 24, 3, 32, 0, 40, 1, 48, 1, 56, 1, 64, 0};
        byte[] buffer = new byte[original.length];
        Deflater compresser = new Deflater();
        compresser.setInput(original);
        compresser.finish();
        int compressedLen = compresser.deflate(buffer);
        compresser.end();

        Inflater decompressor = new Inflater();
        decompressor.setInput(buffer, 0, compressedLen);
        byte[] result = new byte[original.length];
        int resultLength = 0;
        try {
            resultLength = decompressor.inflate(result);
        } catch (DataFormatException e) {
        }
        decompressor.end();

        // the problem is resultLength(63) != original.length(67), and result array is same as original array
    }

原始字节数组是（len是67）：

{10, 17, 97, 98, 99, 100, 101, 102, 103, 104, 105, 103, 107, 108, 109, 110, 111, 112, 113, 16, 2, 24, -50, -1, -113, -59, 5, 34, 20, 8, -35, 1, 16, 40, 24, -34, 1, 32, 60, 40, -33, 1, 48, 80, 56, -32, 1, 64, 100, 42, 16, 8, 2, 16, 1, 24, 3, 32, 0, 40, 1, 48, 1, 56, 1, 64, 0}

结果是（len是63）：

{10, 17, 97, 98, 99, 100, 101, 102, 103, 104, 105, 103, 107, 108, 109, 110, 111, 112, 113, 16, 2, 24, -50, -1, -113, -59, 5, 34, 20, 8, -35, 1, 16, 40, 24, -34, 1, 32, 60, 40, -33, 1, 48, 80, 56, -32, 1, 64, 100, 42, 16, 8, 2, 16, 1, 24, 3, 32, 0, 40, 1, 48, 1}

谢谢！

Answer 1

您没有使输出缓冲区足够大。为了测试，我将byte[] buffer = new byte[original.length];替换为byte[] buffer = new byte[1000];，它运行正常。

如果数据不可压缩，那么输出将大于输入。

使用Inflater解压缩后无法获取原始数据。膨胀

1 个答案: