常用类型转换

package com.opslab.util;

import java.io.ByteArrayOutputStream;

/**
* 常用类型转换
*/
public final class ConvertUtil {

private final static String hexStr = "0123456789ABCDEF";

/**
* 短整型与字节的转换
*/
public final static byte[] shortToByte(short number) {
int temp = number;
byte[] b = new byte[2];
for (int i = 0; i < b.length; i++) {
// 将最低位保存在最低位
b[i] = new Integer(temp & 0xff).byteValue();
// 向右移8位
temp = temp >> 8;
}
return b;
}

/**
* 字节的转换与短整型
*/
public final static short byteToShort(byte[] b) {
short s;
// 最低位
short s0 = (short) (b[0] & 0xff);
short s1 = (short) (b[1] & 0xff);
s1 <<= 8;
s = (short) (s0 | s1);
return s;
}

/**
* 整型与字节数组的转换
*/
public final static byte[] intToByte(int i) {
byte[] bt = new byte[4];
bt[0] = (byte) (0xff & i);
bt[1] = (byte) ((0xff00 & i) >> 8);
bt[2] = (byte) ((0xff0000 & i) >> 16);
bt[3] = (byte) ((0xff000000 & i) >> 24);
return bt;
}

/**
* 整型数组转换为字节数组的转换
*
* @param arr 整型数组
*/
public final static byte[] intToByte(int[] arr) {
byte[] bt = new byte[arr.length * 4];
for (int i = 0; i < arr.length; i++) {
byte[] t = intToByte(arr[i]);
System.arraycopy(t, 0, bt, i + 4, 4);
}
return bt;
}

public final static byte[] encodeBytes(byte[] source, char split) {
ByteArrayOutputStream bos = new ByteArrayOutputStream(source.length);
for (byte b : source) {
if (b < 0) {
b += 256;
}
bos.write(split);
char hex1 = Character.toUpperCase(Character.forDigit((b >> 4) & 0xF, 16));
char hex2 = Character.toUpperCase(Character.forDigit(b & 0xF, 16));
bos.write(hex1);
bos.write(hex2);
}
return bos.toByteArray();
}

/**
* bytes数组转char数组
* bytes to chars
*
* @param bytes bytes数组
*/
public final static char[] bytesToChars(byte[] bytes) {
char[] chars = new char[]{};
if (CheckUtil.valid(bytes)) {
chars = new char[bytes.length];
for (int i = 0; i < bytes.length; i++) {
chars[i] = (char) bytes[i];
}
}
return chars;
}

/**
* 字节数组和整型的转换
*/
public final static int bytesToInt(byte[] bytes) {
int num = bytes[0] & 0xFF;
num |= ((bytes[1] << 8) & 0xFF00);
num |= ((bytes[2] << 16) & 0xFF0000);
num |= ((bytes[3] << 24) & 0xFF000000);
return num;
}

/**
* 字节数组和长整型的转换
*/
public final static byte[] longToByte(long number) {
long temp = number;
byte[] b = new byte[8];
for (int i = 0; i < b.length; i++) {
b[i] = new Long(temp & 0xff).byteValue();
// 将最低位保存在最低位
temp = temp >> 8;
// 向右移8位
}
return b;
}

/**
* 字节数组和长整型的转换
*/
public final static long byteToLong(byte[] b) {
long s;
long s0 = b[0] & 0xff;// 最低位
long s1 = b[1] & 0xff;
long s2 = b[2] & 0xff;
long s3 = b[3] & 0xff;
long s4 = b[4] & 0xff;// 最低位
long s5 = b[5] & 0xff;
long s6 = b[6] & 0xff;
long s7 = b[7] & 0xff; // s0不变
s1 <<= 8;
s2 <<= 16;
s3 <<= 24;
s4 <<= 8 * 4;
s5 <<= 8 * 5;
s6 <<= 8 * 6;
s7 <<= 8 * 7;
s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7;
return s;
}

/**
* 将byte转换为对应的二进制字符串
*
* @param src 要转换成二进制字符串的byte值
*/
public final static String byteToBinary(byte src) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < 8; i++) {
result.append(src % 2 == 0 ? '0' : '1');
src = (byte) (src >>> 1);
}
return result.reverse().toString();
}

/**
* 将十六进制字符串转为二进制字符串
*
* @param hexStr 十六进制字符串
*/
public final static String hexStringtoBinarg(String hexStr) {
hexStr = hexStr.replaceAll("\\s", "").replaceAll("0x", "");
char[] achar = hexStr.toCharArray();
String result = "";
for (char a : achar) {
result += Integer.toBinaryString(
Integer.valueOf(String.valueOf(a), 16)) + " ";
}
return result;
}

/**
* 将二进制转换为十六进制字符输出
*
* @param bytes bytes数组
*/
public final static String bytesToHexString(byte[] bytes) {
String result = "";
String hex;
for (byte b : bytes) {
//字节高4位
hex = String.valueOf(hexStr.charAt((b & 0xF0) >> 4));
//字节低4位
hex += String.valueOf(hexStr.charAt(b & 0x0F));
result += hex + " ";
}
return result;
}

/**
* 把16进制字符串转换成字节数组
*
* @param hexString 16进制字符串
* @return byte[]
*/
public final static byte[] hexStringToByte(String hexString) {
int len = (hexString.length() / 2);
byte[] result = new byte[len];
char[] achar = hexString.toCharArray();
for (int i = 0; i < len; i++) {
int pos = i * 2;
result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
}
return result;
}

private final static int toByte(char c) {
return (byte) hexStr.indexOf(c);
}
}