Java与其他语言数据类型之间的转换方法_JSP教程

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Java与其他语言数据类型之间的转换方法实例程序

/**
* 通信格式转换
*
* Java和一些windows编程语言如c、c 、delphi所写的网络程序进行通讯时，需要进行相应的转换
* 高、低字节之间的转换
* windows的字节序为低字节开头
* linux,unix的字节序为高字节开头
* java则无论平台变化，都是高字节开头
*/

public class FormatTransfer {
/**
* 将int转为低字节在前，高字节在后的byte数组
* @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;
}

/**
* 将int转为高字节在前，低字节在后的byte数组
* @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;
}

/**
* 将short转为低字节在前，高字节在后的byte数组
* @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;
}

/**
* 将short转为高字节在前，低字节在后的byte数组
* @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;
}

/**
* 将将int转为高字节在前，低字节在后的byte数组

public static byte[] toHH(int number) {
int temp = number;
byte[] b = new byte[4];
for (int i = b.length - 1; i > -1; i--) {
b = 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;
}

*/

/**
* 将float转为低字节在前，高字节在后的byte数组
*/
public static byte[] toLH(float f) {
return toLH(Float.floatToRawIntBits(f));
}

/**
* 将float转为高字节在前，低字节在后的byte数组
*/
public static byte[] toHH(float f) {
return toHH(Float.floatToRawIntBits(f));
}

/**
* 将String转为byte数组
*/
public static byte[] stringToBytes(String s, int length) {
while (s.getBytes().length < length) {
s = " ";
}
return s.getBytes();
}

/**
* 将字节数组转换为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 & 0xff));
}
return result.toString();
}

/**
* 将字符串转换为byte数组
* @param s String
* @return byte[]
*/
public static byte[] stringToBytes(String s) {
return s.getBytes();
}

/**
* 将高字节数组转换为int
* @param b byte[]
* @return int
*/
public static int hBytesToInt(byte[] b) {
int s = 0;
for (int i = 0; i < 3; i ) {
if (b >= 0) {
s = s b;
} else {
s = s 256 b;
}
s = s * 256;
}
if (b[3] >= 0) {
s = s b[3];
} else {
s = s 256 b[3];
}
return s;
}

/**
* 将低字节数组转换为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;
}

/**
* 高字节数组到short的转换
* @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;
}

/**
* 低字节数组到short的转换
* @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;
}

/**
* 高字节数组转换为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);
}

/**
* 低字节数组转换为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);
}

/**
* 将byte数组中的元素倒序排列
*/
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;
}
return result;
}

/**
* 打印byte数组
*/
public static void printBytes(byte[] bb) {
int length = bb.length;
for (int i=0; i System.out.print(bb " ");
}
System.out.println("");
}

public static void logBytes(byte[] bb) {
int length = bb.length;
String out = "";
for (int i=0; i out = out bb " ";
}

}

/**
* 将int类型的值转换为字节序颠倒过来对应的int值
* @param i int
* @return int
*/
public static int reverseInt(int i) {
int result = FormatTransfer.hBytesToInt(FormatTransfer.toLH(i));
return result;
}

/**
* 将short类型的值转换为字节序颠倒过来对应的short值
* @param s short
* @return short
*/
public static short reverseShort(short s) {
short result = FormatTransfer.hBytesToShort(FormatTransfer.toLH(s));
return result;
}

/**
* 将float类型的值转换为字节序颠倒过来对应的float值
* @param f float
* @return float
*/
public static float reverseFloat(float f) {
float result = FormatTransfer.hBytesToFloat(FormatTransfer.toLH(f));
return result;
}

}

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