Java：DataInputStream替换字节序

下面是我的代码，它替换了DataInputStream以包装InputStream，但除了读取大端类型的常规方法之外，还提供了读取小端数据类型的额外方法。 如果你愿意，可以随意使用它。

我有一些保留如下。 请注意不改变function的方法（读取大端类型的函数）。 我无法将DataInputStream实现为基类并使用其方法，如read（），readInt（），readChar（）等？

我的class级层次似乎有点奇怪。 这个合适吗？

这些其他类型如readUTF（）或readLine（）是否需要一个小的endian版本？ 或者这是特定程序的主观？

Java如何存储布尔类型？ 字节顺序是否也是主观的？

谢谢你满足我的好奇心:)

import java.io.*; /** * Replacement for a DataInputStream that provides both little and big endian reading capabilities for convenience without need to implement a ByteBuffer * @author Bill ([e-mail]) */ public class EndianInputStream extends InputStream implements DataInput { private DataInputStream dataInStream; private InputStream inStream; private byte byteBuffer[]; /** * Constructor to wrap InputStream for little and big endian data * @param refInStream Inputstream to wrap */ public EndianInputStream(InputStream refInStream) { inStream = refInStream; dataInStream = new DataInputStream(inStream); byteBuffer = new byte[8]; // Largest data type is 64-bits (8 bytes) } @Override public int available() throws IOException { return dataInStream.available(); } @Override public final int read(byte refBuffer[], int offset, int readLen) throws IOException { return inStream.read(refBuffer, offset, readLen); } @Override public int read() throws IOException { return inStream.read(); } @Override public final int readUnsignedByte() throws IOException { return dataInStream.readUnsignedByte(); } @Deprecated @Override public final String readLine() throws IOException { return dataInStream.readLine(); } @Override public final String readUTF() throws IOException { return dataInStream.readUTF(); } @Override public final void close() throws IOException { dataInStream.close(); } @Override public final void readFully(byte refBuffer[]) throws IOException { dataInStream.readFully(refBuffer, 0, refBuffer.length); } @Override public final void readFully(byte refBuffer[], int offset, int readLen) throws IOException { dataInStream.readFully(refBuffer, offset, readLen); } @Override public final int skipBytes(int n) throws IOException { return dataInStream.skipBytes(n); } @Override public final boolean readBoolean() throws IOException { return dataInStream.readBoolean(); } @Override public final byte readByte() throws IOException { return dataInStream.readByte(); } @Override public final float readFloat() throws IOException { return Float.intBitsToFloat(readInt()); } @Override public final double readDouble() throws IOException { return Double.longBitsToDouble(readLong()); } @Override public final short readShort() throws IOException { return dataInStream.readShort(); } @Override public final int readUnsignedShort() throws IOException { return dataInStream.readUnsignedShort(); } @Override public final long readLong() throws IOException { return dataInStream.readLong(); } @Override public final char readChar() throws IOException { return dataInStream.readChar(); } @Override public final int readInt() throws IOException { return dataInStream.readInt(); } /** * Reads floating point type stored in little endian (see readFloat() for big endian) * @return float value translated from little endian * @throws IOException if an IO error occurs */ public final float readLittleFloat() throws IOException { return Float.intBitsToFloat(readLittleInt()); } /** * Reads double precision floating point type stored in little endian (see readDouble() for big endian) * @return double precision float value translated from little endian * @throws IOException if an IO error occurs */ public final double readLittleDouble() throws IOException { return Double.longBitsToDouble(readLittleLong()); } /** * Reads short type stored in little endian (see readShort() for big endian) * @return short value translated from little endian * @throws IOException if an IO error occurs */ public final short readLittleShort() throws IOException { dataInStream.readFully(byteBuffer, 0, 2); return (short)((byteBuffer[1] & 0xff) << 8 | (byteBuffer[0] & 0xff)); } /** * Reads char (16-bits) type stored in little endian (see readChar() for big endian) * @return char value translated from little endian * @throws IOException if an IO error occurs */ public final char readLittleChar() throws IOException { dataInStream.readFully(byteBuffer, 0, 2); return (char)((byteBuffer[1] & 0xff) << 8 | (byteBuffer[0] & 0xff)); } /** * Reads integer type stored in little endian (see readInt() for big endian) * @return integer value translated from little endian * @throws IOException if an IO error occurs */ public final int readLittleInt() throws IOException { dataInStream.readFully(byteBuffer, 0, 4); return (byteBuffer[3]) << 24 | (byteBuffer[2] & 0xff) << 16 | (byteBuffer[1] & 0xff) << 8 | (byteBuffer[0] & 0xff); } /** * Reads long type stored in little endian (see readLong() for big endian) * @return long value translated from little endian * @throws IOException if an IO error occurs */ public final long readLittleLong() throws IOException { dataInStream.readFully(byteBuffer, 0, 8); return (long)(byteBuffer[7]) << 56 | (long)(byteBuffer[6]&0xff) << 48 | (long)(byteBuffer[5] & 0xff) << 40 | (long)(byteBuffer[4] & 0xff) << 32 | (long)(byteBuffer[3] & 0xff) << 24 | (long)(byteBuffer[2] & 0xff) << 16 | (long)(byteBuffer[1] & 0xff) << 8 | (long)(byteBuffer[0] & 0xff); } /** * Reads unsigned short type stored in little endian (see readUnsignedShort() for big endian) * @return integer value representing unsigned short value translated from little endian * @throws IOException if an IO error occurs */ public final int readLittleUnsignedShort() throws IOException { dataInStream.readFully(byteBuffer, 0, 2); return ((byteBuffer[1] & 0xff) << 8 | (byteBuffer[0] & 0xff)); } } 

Answer 1

readBoolean()读取单个字节。 readLine()读取单个字节并将每个字节转换为char 。

readUTF()读取修改后的UTF-8（代码单元大小为一个八位字节）。 UTF-8 没有字节顺序 。

这些方法没有字节序问题。

至于设计，请考虑类型是否需要是InputStream以及ByteBuffer是否有用。 如果您没有使用标记/重置和Closeable等function， Closeable可能不会公开新类型：

 public class Bytes { public static DataInput littleEndian(final DataInput decorated) { class LittleInput implements DataInput { private ByteBuffer buffer = ByteBuffer.allocate(8); public int readInt() throws IOException { buffer.clear(); buffer.order(ByteOrder.BIG_ENDIAN) .putInt(decorated.readInt()) .flip(); return buffer.order(ByteOrder.LITTLE_ENDIAN) .getInt(); } //TODO: other methods } return new LittleInput(); } } 

我注意到流行的Guava库已经有了LittleEndianDataInputStream 。