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JAVA基本數據類型與其他語言數據類型之間的轉換方法 (ZT)

/**

* 通信格式轉換

* Java和一些windows編程語言如c、c++、delphi所寫的網絡程序進行通訊時，需要進行相應的轉換

* 高、低字節之間的轉換

* windows的字節序為低字節開頭

* linux,unix的字節序為高字節開頭

* java則無論平臺變化，都是高字節開頭

public class FormatTransfer {

/**

* 將int轉為低字節在前，高字節在后的byte數組

* @param n int

* @return byte[]

public static byte[] toLH(int n) {

byte[] b = new byte[4];

b[0] = (byte) (n & 0xff);

b[1] = (byte) (n >> 8 & 0xff);

b[2] = (byte) (n >> 16 & 0xff);

b[3] = (byte) (n >> 24 & 0xff);

return b;

}

/**

* 將int轉為高字節在前，低字節在后的byte數組

* @param n int

* @return byte[]

public static byte[] toHH(int n) {

byte[] b = new byte[4];

b[3] = (byte) (n & 0xff);

b[2] = (byte) (n >> 8 & 0xff);

b[1] = (byte) (n >> 16 & 0xff);

b[0] = (byte) (n >> 24 & 0xff);

return b;

}

/**

* 將short轉為低字節在前，高字節在后的byte數組

* @param n short

* @return byte[]

public static byte[] toLH(short n) {

byte[] b = new byte[2];

b[0] = (byte) (n & 0xff);

b[1] = (byte) (n >> 8 & 0xff);

return b;

}

/**

* 將short轉為高字節在前，低字節在后的byte數組

* @param n short

* @return byte[]

public static byte[] toHH(short n) {

byte[] b = new byte[2];

b[1] = (byte) (n & 0xff);

b[0] = (byte) (n >> 8 & 0xff);

return b;

}

/**

* 將將int轉為高字節在前，低字節在后的byte數組

public static byte[] toHH(int number) {

int temp = number;

byte[] b = new byte[4];

for (int i = b.length - 1; i > -1; i--) {

b[i] = new Integer(temp & 0xff).byteValue();

temp = temp >> 8;

}

return b;

}

public static byte[] IntToByteArray(int i) {

byte[] abyte0 = new byte[4];

abyte0[3] = (byte) (0xff & i);

abyte0[2] = (byte) ((0xff00 & i) >> 8);

abyte0[1] = (byte) ((0xff0000 & i) >> 16);

abyte0[0] = (byte) ((0xff000000 & i) >> 24);

return abyte0;

}

/**

* 將float轉為低字節在前，高字節在后的byte數組

public static byte[] toLH(float f) {

return toLH(Float.floatToRawIntBits(f));

}

/**

* 將float轉為高字節在前，低字節在后的byte數組

public static byte[] toHH(float f) {

return toHH(Float.floatToRawIntBits(f));

}

/**

* 將String轉為byte數組

public static byte[] stringToBytes(String s, int length) {

while (s.getBytes().length < length) {

s += " ";

}

return s.getBytes();

}

/**

* 將字節數組轉換為String

* @param b byte[]

* @return String

public static String bytesToString(byte[] b) {

StringBuffer result = new StringBuffer("");

int length = b.length;

for (int i=0; i result.append((char)(b[i] & 0xff));

}

return result.toString();

}

/**

* 將字符串轉換為byte數組

* @param s String

* @return byte[]

public static byte[] stringToBytes(String s) {

return s.getBytes();

}

/**

* 將高字節數組轉換為int

* @param b byte[]

* @return int

public static int hBytesToInt(byte[] b) {

int s = 0;

for (int i = 0; i < 3; i++) {

if (b[i] >= 0) {

s = s + b[i];

} else {

s = s + 256 + b[i];

}

s = s * 256;

}

if (b[3] >= 0) {

s = s + b[3];

} else {

s = s + 256 + b[3];

}

return s;

}

/**

* 將低字節數組轉換為int

* @param b byte[]

* @return int

public static int lBytesToInt(byte[] b) {

int s = 0;

for (int i = 0; i < 3; i++) {

if (b[3-i] >= 0) {

s = s + b[3-i];

} else {

s = s + 256 + b[3-i];

}

s = s * 256;

}

if (b[0] >= 0) {

s = s + b[0];

} else {

s = s + 256 + b[0];

}

return s;

}

/**

* 高字節數組到short的轉換

* @param b byte[]

* @return short

public static short hBytesToShort(byte[] b) {

int s = 0;

if (b[0] >= 0) {

s = s + b[0];

} else {

s = s + 256 + b[0];

}

s = s * 256;

if (b[1] >= 0) {

s = s + b[1];

} else {

s = s + 256 + b[1];

}

short result = (short)s;

return result;

}

/**

* 低字節數組到short的轉換

* @param b byte[]

* @return short

public static short lBytesToShort(byte[] b) {

int s = 0;

if (b[1] >= 0) {

s = s + b[1];

} else {

s = s + 256 + b[1];

}

s = s * 256;

if (b[0] >= 0) {

s = s + b[0];

} else {

s = s + 256 + b[0];

}

short result = (short)s;

return result;

}

/**

* 高字節數組轉換為float

* @param b byte[]

* @return float

public static float hBytesToFloat(byte[] b) {

int i = 0;

Float F = new Float(0.0);

i = ((((b[0]&0xff)<<8 | (b[1]&0xff))<<8) | (b[2]&0xff))<<8 | (b[3]&0xff);

return F.intBitsToFloat(i);

}

/**

* 低字節數組轉換為float

* @param b byte[]

* @return float

public static float lBytesToFloat(byte[] b) {

int i = 0;

Float F = new Float(0.0);

i = ((((b[3]&0xff)<<8 | (b[2]&0xff))<<8) | (b[1]&0xff))<<8 | (b[0]&0xff);

return F.intBitsToFloat(i);

}

/**

* 將byte數組中的元素倒序排列

public static byte[] bytesReverseOrder(byte[] b) {

int length = b.length;

byte[] result = new byte[length];

for(int i=0; i result[length-i-1] = b[i];

}

return result;

}

/**

* 打印byte數組

public static void printBytes(byte[] bb) {

int length = bb.length;

for (int i=0; i System.out.print(bb[i] + " ");

}

System.out.println("");

}

public static void logBytes(byte[] bb) {

int length = bb.length;

String out = "";

for (int i=0; i out = out + bb[i] + " ";

}

/**

* 將int類型的值轉換為字節序顛倒過來對應的int值

* @param i int

* @return int

public static int reverseInt(int i) {

int result = FormatTransfer.hBytesToInt(FormatTransfer.toLH(i));

return result;

}

/**

* 將short類型的值轉換為字節序顛倒過來對應的short值

* @param s short

* @return short

public static short reverseShort(short s) {

short result = FormatTransfer.hBytesToShort(FormatTransfer.toLH(s));

return result;

}

/**

* 將float類型的值轉換為字節序顛倒過來對應的float值

* @param f float

* @return float

public static float reverseFloat(float f) {

float result = FormatTransfer.hBytesToFloat(FormatTransfer.toLH(f));

return result;

}

posted on 2008-07-20 12:02 SeesSea 閱讀(323) 評論(0) 編輯收藏所屬分類: JAVA

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JAVA基本數據類型與其他語言數據類型之間的轉換方法 (ZT)

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