java的int、char、long、float、double对byte的转换，在通信的时候会用到

Java代码
package com.util;

/**
*
* <ul>
* <li>文件名称: com.born.util.ByteUtil.java</li>
* <li>文件描述: byte转换工具</li>
* <li>版权所有: 版权所有(C)2001-2006</li>
* <li>公司: bran</li>
* <li>内容摘要:</li>
* <li>其他说明:</li>
* <li>完成日期：2011-7-18</li>
* <li>修改记录0：无</li>
* </ul>
*
* @version 1.0
* @author 许力多
*/
public class ByteUtil {
    /**
     * 转换short为byte
     *
     * @param b
     * @param s
     *            需要转换的short
     * @param index
     */
    public static void putShort(byte b[], short s, int index) {
        b[index + 1] = (byte) (s >> 8);
        b[index + 0] = (byte) (s >> 0);
    }

    /**
     * 通过byte数组取到short
     *
     * @param b
     * @param index
     *            第几位开始取
     * @return
     */
    public static short getShort(byte[] b, int index) {
        return (short) (((b[index + 1] << 8) | b[index + 0] & 0xff));
    }

    /**
     * 转换int为byte数组
     *
     * @param bb
     * @param x
     * @param index
     */
    public static void putInt(byte[] bb, int x, int index) {
        bb[index + 3] = (byte) (x >> 24);
        bb[index + 2] = (byte) (x >> 16);
        bb[index + 1] = (byte) (x >> 8);
        bb[index + 0] = (byte) (x >> 0);
    }

    /**
     * 通过byte数组取到int
     *
     * @param bb
     * @param index
     *            第几位开始
     * @return
     */
    public static int getInt(byte[] bb, int index) {
        return (int) ((((bb[index + 3] & 0xff) << 24)
                | ((bb[index + 2] & 0xff) << 16)
                | ((bb[index + 1] & 0xff) << 8) | ((bb[index + 0] & 0xff) << 0)));
    }

    /**
     * 转换long型为byte数组
     *
     * @param bb
     * @param x
     * @param index
     */
    public static void putLong(byte[] bb, long x, int index) {
        bb[index + 7] = (byte) (x >> 56);
        bb[index + 6] = (byte) (x >> 48);
        bb[index + 5] = (byte) (x >> 40);
        bb[index + 4] = (byte) (x >> 32);
        bb[index + 3] = (byte) (x >> 24);
        bb[index + 2] = (byte) (x >> 16);
        bb[index + 1] = (byte) (x >> 8);
        bb[index + 0] = (byte) (x >> 0);
    }

    /**
     * 通过byte数组取到long
     *
     * @param bb
     * @param index
     * @return
     */
    public static long getLong(byte[] bb, int index) {
        return ((((long) bb[index + 7] & 0xff) << 56)
                | (((long) bb[index + 6] & 0xff) << 48)
                | (((long) bb[index + 5] & 0xff) << 40)
                | (((long) bb[index + 4] & 0xff) << 32)
                | (((long) bb[index + 3] & 0xff) << 24)
                | (((long) bb[index + 2] & 0xff) << 16)
                | (((long) bb[index + 1] & 0xff) << 8) | (((long) bb[index + 0] & 0xff) << 0));
    }

    /**
     * 字符到字节转换
     *
     * @param ch
     * @return
     */
    public static void putChar(byte[] bb, char ch, int index) {
        int temp = (int) ch;
        // byte[] b = new byte[2];
        for (int i = 0; i < 2; i ++ ) {
            bb[index + i] = new Integer(temp & 0xff).byteValu

补充：软件开发 , Java ,