byte[]/char* 转int, int 转byte[]/char 大小端_char数组转int时,值的大小和大小端模式有关吗-优快云博客

本文链接：https://blog.youkuaiyun.com/wuchuanpingstone/article/details/80321676

本文提供了一系列用于在大端和小端模式下将整数转换为字节数组及字符数组的方法，并实现了相应的反向转换。适用于网络通信、文件读写等场景中的数据格式转换。

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/**
 * 以大端模式将int转成byte[]/char
 */
public static byte[] intToBytesBig(int value) {
    byte[] src = new byte[4];
    src[0] = (byte) ((value >> 24) & 0xFF);
    src[1] = (byte) ((value >> 16) & 0xFF);
    src[2] = (byte) ((value >> 8) & 0xFF);
    src[3] = (byte) (value & 0xFF);
    return src;
}

public static char* intToCharBig(int value) {
    char src[4];
    src[0] = (char) ((value >> 24) & 0xFF);
    src[1] = (char) ((value >> 16) & 0xFF);
    src[2] = (char) ((value >> 8) & 0xFF);
    src[3] = (char) (value & 0xFF);
    return src;
}


/**
 * 以小端模式将int转成byte[]/char
 *
 * @param value
 * @return
 */
public static byte[] intToBytesLittle(int value) {
    byte[] src = new byte[4];
    src[3] = (byte) ((value >> 24) & 0xFF);
    src[2] = (byte) ((value >> 16) & 0xFF);
    src[1] = (byte) ((value >> 8) & 0xFF);
    src[0] = (byte) (value & 0xFF);
    return src;
}

public static char* intToCharBig(int value) {
    char src[4];
    src[3] = (char) ((value >> 24) & 0xFF);
    src[2] = (char) ((value >> 16) & 0xFF);
    src[1] = (char) ((value >> 8) & 0xFF);
    src[0] = (char) (value & 0xFF);
    
    return src;
}


/**
 * 以大端模式将byte[]/char转成int
 */
public static int bytesToIntBig(byte[] src, int offset) {
    int value;
    value = (int) (((src[offset] & 0xFF) << 24)
            | ((src[offset + 1] & 0xFF) << 16)
            | ((src[offset + 2] & 0xFF) << 8)
            | (src[offset + 3] & 0xFF));
    return value;
}

public static int charToIntBig(char* src, int offset){
    int value;
    value = (int) (((src[offset] & 0xFF) << 24)
            | ((src[offset + 1] & 0xFF) << 16)
            | ((src[offset + 2] & 0xFF) << 8)
            | (src[offset + 3] & 0xFF));
    return value;
}
/**
 * 以小端模式将byte[]/char转成int
 */
public static int bytesToIntLittle(byte[] src, int offset) {
    int value;
    value = (int) ((src[offset] & 0xFF)
            | ((src[offset + 1] & 0xFF) << 8)
            | ((src[offset + 2] & 0xFF) << 16)
            | ((src[offset + 3] & 0xFF) << 24));
    return value;
}

public static int charToIntLittle(char* src, int offset) {
    int value;
    value = (int) ((src[offset] & 0xFF)
            | ((src[offset + 1] & 0xFF) << 8)
            | ((src[offset + 2] & 0xFF) << 16)
            | ((src[offset + 3] & 0xFF) << 24));
    return value;
}