InputStream,int,shot,long与byte数组之间的互相转换

没别的，直接上代码！

?

package com.dst.util;import java.io.*;/** * 流操作工具类 *  * @author 崔素强 */public class StreamTool {/** * @方法功能 InputStream 转为 byte * @param InputStream * @return 字节数组 * @throws Exception */public static byte[] inputStream2Byte(InputStream inStream)throws Exception {// ByteArrayOutputStream outSteam = new ByteArrayOutputStream();// byte[] buffer = new byte[1024];// int len = -1;// while ((len = inStream.read(buffer)) != -1) {// outSteam.write(buffer, 0, len);// }// outSteam.close();// inStream.close();// return outSteam.toByteArray();int count = 0;while (count == 0) {count = inStream.available();}byte[] b = new byte[count];inStream.read(b);return b;}/** * @方法功能 byte 转为 InputStream * @param 字节数组 * @return InputStream * @throws Exception */public static InputStream byte2InputStream(byte[] b) throws Exception {InputStream is = new ByteArrayInputStream(b);return is;}/** * @功能 短整型与字节的转换 * @param 短整型 * @return 两位的字节数组 */public static byte[] shortToByte(short number) {int temp = number;byte[] b = new byte[2];for (int i = 0; i < b.length; i++) {b[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位temp = temp >> 8; // 向右移8位}return b;}/** * @功能 字节的转换与短整型 * @param 两位的字节数组 * @return 短整型 */public static short byteToShort(byte[] b) {short s = 0;short s0 = (short) (b[0] & 0xff);// 最低位short s1 = (short) (b[1] & 0xff);s1 <<= 8;s = (short) (s0 | s1);return s;}/** * @方法功能 整型与字节数组的转换 * @param 整型 * @return 四位的字节数组 */public 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;}/** * @方法功能 字节数组和整型的转换 * @param 字节数组 * @return 整型 */public 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;}/** * @方法功能 字节数组和长整型的转换 * @param 字节数组 * @return 长整型 */public 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;}/** * @方法功能 字节数组和长整型的转换 * @param 字节数组 * @return 长整型 */public static long byteToLong(byte[] b) {long s = 0;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;}}

?

public static void main(String[] args) {short a = 65;short b = 12;short c = 15;short d = 24;byte[] bt = new byte[8];byte[] aa = shortToByte(a);byte[] bb = shortToByte(b);byte[] cc = shortToByte(c);byte[] dd = shortToByte(d);// 数组源，数组源拷贝的开始位子，目标，目标填写的开始位子，拷贝的长度System.arraycopy(aa, 0, bt, 0, 2);System.arraycopy(bb, 0, bt, 2, 2);System.arraycopy(cc, 0, bt, 4, 2);System.arraycopy(dd, 0, bt, 6, 2);short[] res = byteArray2ShortArray(bt);for (short t : res) {System.out.println(t);}System.out.println("--------------------------");byte[] stt = shortArray2ByteArray(res);res = byteArray2ShortArray(stt);for (short t : res) {System.out.println(t);}}/** * @说明 主要是为解析静态数据包，将一个字节数组转换为short数组 * @param b */public static short[] byteArray2ShortArray(byte[] b) {int len = b.length / 2;int index = 0;short[] re = new short[len];byte[] buf = new byte[2];for (int i = 0; i < b.length;) {buf[0] = b[i];buf[1] = b[i + 1];short st = byteToShort(buf);re[index] = st;index++;i += 2;}return re;}/** * @说明 主要是为解析静态数据包，将一个short数组反转为字节数组 * @param b */public static byte[] shortArray2ByteArray(short[] b) {byte[] rebt = new byte[b.length * 2];int index = 0;for (int i = 0; i < b.length; i++) {short st = b[i];byte[] bt = shortToByte(st);rebt[index] = bt[0];rebt[index + 1] = bt[1];index += 2;}return rebt;}public static void main(String[] args) {short a = 65;short b = 12;short c = 15;short d = 24;byte[] bt = new byte[8];byte[] aa = shortToByte(a);byte[] bb = shortToByte(b);byte[] cc = shortToByte(c);byte[] dd = shortToByte(d);// 数组源，数组源拷贝的开始位子，目标，目标填写的开始位子，拷贝的长度System.arraycopy(aa, 0, bt, 0, 2);System.arraycopy(bb, 0, bt, 2, 2);System.arraycopy(cc, 0, bt, 4, 2);System.arraycopy(dd, 0, bt, 6, 2);short[] res = byteArray2ShortArray(bt);for (short t : res) {System.out.println(t);}System.out.println("--------------------------");byte[] stt = shortArray2ByteArray(res);res = byteArray2ShortArray(stt);for (short t : res) {System.out.println(t);}}/** * @说明 主要是为解析静态数据包，将一个字节数组转换为short数组 * @param b */public static short[] byteArray2ShortArray(byte[] b) {int len = b.length / 2;int index = 0;short[] re = new short[len];byte[] buf = new byte[2];for (int i = 0; i < b.length;) {buf[0] = b[i];buf[1] = b[i + 1];short st = byteToShort(buf);re[index] = st;index++;i += 2;}return re;}/** * @说明 主要是为解析静态数据包，将一个short数组反转为字节数组 * @param b */public static byte[] shortArray2ByteArray(short[] b) {byte[] rebt = new byte[b.length * 2];int index = 0;for (int i = 0; i < b.length; i++) {short st = b[i];byte[] bt = shortToByte(st);rebt[index] = bt[0];rebt[index + 1] = bt[1];index += 2;}return rebt;}
其实也有现成的解决方法，相当强悍：

ByteBuffer bytes = ByteBuffer.allocate(8)        .putShort((short) 65)        .putShort((short) 12)        .putShort((short) 15)        .putShort((short) 24);System.out.println(Arrays.toString(bytes.array()));short [] shorts = new short[4];ByteBuffer.wrap(new byte[] {0, 65, 0, 12, 0, 15, 0, 24})        .asShortBuffer()        .get(shorts);System.out.println(Arrays.toString(shorts));

5 楼 canghailan 2012-03-02 我原来也做过类似的事情，后来读JDK源码时发现已经有更精妙完善的解决方法。 6 楼 cuisuqiang 2012-03-06 canghailan 写道我原来也做过类似的事情，后来读JDK源码时发现已经有更精妙完善的解决方法。
是吗，发出来分享一下 7 楼 canghailan 2012-03-06 cuisuqiang 写道canghailan 写道我原来也做过类似的事情，后来读JDK源码时发现已经有更精妙完善的解决方法。
是吗，发出来分享一下
http://www.oschina.net/code/list_by_user?id=116768 8 楼 cuisuqiang 2012-03-07 canghailan 写道cuisuqiang 写道canghailan 写道我原来也做过类似的事情，后来读JDK源码时发现已经有更精妙完善的解决方法。
是吗，发出来分享一下
http://www.oschina.net/code/list_by_user?id=116768
没有仔细看，不过好像也差不多吧！还是谢谢分享，希望共同进步！