java基本数据类型转换成byte[]数组 - JAVA

byte) (param & 0xff);
param = param >> 8;
}
}

}

/**
* int类型转换成byte数组
*
* @param arr byte[]
* @param param int int类型的参数
* @param index int
*/
public static void putInt(byte[] arr, int param, int index) {
int len = (index - 1) + 4;
boolean b = isOutOfArrLength(arr.length, len); //判断当前数组长度是否大于转换的数组长度
if (b) {
arr[index + 0] = (byte) ((param >> 24) & 0xff);
arr[index + 1] = (byte) ((param >> 16) & 0xff);
arr[index + 2] = (byte) ((param >> 8) & 0xff);
arr[index + 3] = (byte) (param & 0xff);
}
}

/**
* short类型转换成byte数组
*
* @param arr byte[]
* @param param short
* @param index int
*/
public static void putShort(byte[] arr, short param, int index) {
int len = (index - 1) + 2;
boolean b = isOutOfArrLength(arr.length, len); //判断当前数组长度是否大于转换的数组长度
if (b) {
arr[index + 0] = (byte) ((param >> 8) & 0xff);
arr[index + 1] = (byte) (param & 0xff);
}
}

/**
* 字符串转换成byte数组
*
* @param arr byte[]
* @param str String

* @param index int
* @throws java.io.UnsupportedEncodingException
*/
public static void putString(byte[] arr, String str, int index) {

try {
byte[] bb = str.getBytes("GBK");
int len = index + bb.length;
boolean b = isOutOfArrLength(arr.length, len);
if (b) {
for (int i = 0; i < bb.length; i++) {
arr[index + i] = bb[i];
}
} else {
// 如果当前数组长度小于转换的数组长度，就根据index截取转换的数组元素
for(int j=0;j arr[index+j] = bb[j];
}
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}

}

/**
* 判断数组下标是否越界
*
* @param arrLength
* 数组总长度
* @param index
* 数组偏移量
* @return
*/
public static boolean isOutOfArrLength(int arrLength, int index) {
boolean b;
if (arrLength > index) {
b = true;
} else {
b = false;
}
return b;
}
}

java基本数据类型转换成byte[]数组 (二)