java根本数据类型转换成byte[]数组

package com.mystudypro.byteutil;

import java.io.UnsupportedEncodingException;

public class ConToByte {

	/**
	 * double改换byte
	 * @param  arr  byte[]
	 * @param  param    double   double类型的参数
	 * @p http://www.fpnanchang.com aram  index  int
	 */
	public static void putDouble(byte[] arr, double param, int index) {
		int len = (index - 1)   8;
        int arrLen = arr.length;
		boolean b = isOutOfArrLength(arrLen, len);   //区分其时数组长度能否大于改换的数组长度
        Long l = Double.doubleToLongBits(param);
		if (b) { 
			for (int i = 7; i >=0; i--) {
                arr[index   i] = l.byteValue();
				l = l >> 8;
			}
		} else {
            // 如果其时数组长度小于改换的数组长度，就根据index截取改换的数组元素
             l = l>>(8*index);
            for(int j= arrLen-index-1;j>=0;j--){ 
                arr[index j] = l.byteValue();
                l = l>>8;
            }
        }

	}

	/**
	 * float改换byte
	 * 
	 * @param  arr   byte[]
	 * @param  param    float  float类型的参数
	 * @param  index  int
	 */
	public static void putFloat(byte[] arr, float param, int index) {
		int len = (index - 1)   4;
        int arrLen = arr.length;
		boolean b = isOutOfArrLength(arrLen, len);    //区分其时数组长度能否大于改换的数组长度
        int l = Float.floatToIntBits(param);
		if (b) {
			for (int i = 3; i >=0; i--) {
				arr[index   i] = new Integer(l).byteValue();
				l = l >> 8;
			}
		} else {
            // 如果其时数组长度小于改换的数组长度，就根据index截取改换的数组元素
            l = l>>(8*index);
            for(int j=arrLen-index-1;j>=0;j--){ 
                arr[index j] =  new Integer(l).byteValue();
                 l =l>>8;
            }
        }

	}

	/**
	 * 字符到字节改换
	 * 
	 * @param  arr   byte[]
	 * @param  ch     char   char类型的参数
	 * @param  index   int
	 * @return
	 */
	public static void putChar(byte[] arr, char ch, int index) {
		int len = (index - 1)   4;
		boolean b = isOutOfArrLength(arr.length, len);      //区分其时数组长度能否大于改换的数组长度
		if (b) {
			int temp = (int) ch;
			for (int i = 1; i >=0; i--) {
				arr[index   i] = new Integer(temp  http://www.fpzhuhai.com