这里有新鲜出炉的Java函数式编程,程序狗速度看过来!
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
下面小编就为大家带来一篇Java基本类型与byte数组之间相互转换方法。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
Java基本类型与byte数组之间相互转换,刚刚写的
- package cn.teaey.utils;
- import java.nio.charset.Charset;
- public class ByteUtil
- {
- public static byte[] getBytes(short data)
- {
- byte[] bytes = new byte[2];
- bytes[0] = (byte) (data & 0xff);
- bytes[1] = (byte) ((data & 0xff00) >> 8);
- return bytes;
- }
- public static byte[] getBytes(char data)
- {
- byte[] bytes = new byte[2];
- bytes[0] = (byte) (data);
- bytes[1] = (byte) (data >> 8);
- return bytes;
- }
- public static byte[] getBytes(int data)
- {
- byte[] bytes = new byte[4];
- bytes[0] = (byte) (data & 0xff);
- bytes[1] = (byte) ((data & 0xff00) >> 8);
- bytes[2] = (byte) ((data & 0xff0000) >> 16);
- bytes[3] = (byte) ((data & 0xff000000) >> 24);
- return bytes;
- }
- public static byte[] getBytes(long data)
- {
- byte[] bytes = new byte[8];
- bytes[0] = (byte) (data & 0xff);
- bytes[1] = (byte) ((data >> 8) & 0xff);
- bytes[2] = (byte) ((data >> 16) & 0xff);
- bytes[3] = (byte) ((data >> 24) & 0xff);
- bytes[4] = (byte) ((data >> 32) & 0xff);
- bytes[5] = (byte) ((data >> 40) & 0xff);
- bytes[6] = (byte) ((data >> 48) & 0xff);
- bytes[7] = (byte) ((data >> 56) & 0xff);
- return bytes;
- }
- public static byte[] getBytes(float data)
- {
- int intBits = Float.floatToIntBits(data);
- return getBytes(intBits);
- }
- public static byte[] getBytes(double data)
- {
- long intBits = Double.doubleToLongBits(data);
- return getBytes(intBits);
- }
- public static byte[] getBytes(String data, String charsetName)
- {
- Charset charset = Charset.forName(charsetName);
- return data.getBytes(charset);
- }
- public static byte[] getBytes(String data)
- {
- return getBytes(data, "GBK");
- }
- public static short getShort(byte[] bytes)
- {
- return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
- }
- public static char getChar(byte[] bytes)
- {
- return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
- }
- public static int getInt(byte[] bytes)
- {
- return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 & (bytes[2] << 16)) | (0xff000000 & (bytes[3] << 24));
- }
- public static long getLong(byte[] bytes)
- {
- return(0xffL & (long)bytes[0]) | (0xff00L & ((long)bytes[1] << 8)) | (0xff0000L & ((long)bytes[2] << 16)) | (0xff000000L & ((long)bytes[3] << 24))
- | (0xff00000000L & ((long)bytes[4] << 32)) | (0xff0000000000L & ((long)bytes[5] << 40)) | (0xff000000000000L & ((long)bytes[6] << 48)) | (0xff00000000000000L & ((long)bytes[7] << 56));
- }
- public static float getFloat(byte[] bytes)
- {
- return Float.intBitsToFloat(getInt(bytes));
- }
- public static double getDouble(byte[] bytes)
- {
- long l = getLong(bytes);
- System.out.println(l);
- return Double.longBitsToDouble(l);
- }
- public static String getString(byte[] bytes, String charsetName)
- {
- return new String(bytes, Charset.forName(charsetName));
- }
- public static String getString(byte[] bytes)
- {
- return getString(bytes, "GBK");
- }
- public static void main(String[] args)
- {
- short s = 122;
- int i = 122;
- long l = 1222222;
- char c = 'a';
- float f = 122.22f;
- double d = 122.22;
- String string = "我是好孩子";
- System.out.println(s);
- System.out.println(i);
- System.out.println(l);
- System.out.println(c);
- System.out.println(f);
- System.out.println(d);
- System.out.println(string);
- System.out.println("**************");
- System.out.println(getShort(getBytes(s)));
- System.out.println(getInt(getBytes(i)));
- System.out.println(getLong(getBytes(l)));
- System.out.println(getChar(getBytes(c)));
- System.out.println(getFloat(getBytes(f)));
- System.out.println(getDouble(getBytes(d)));
- System.out.println(getString(getBytes(string)));
- }
- }
以上这篇Java基本类型与byte数组之间相互转换方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持PHPERZ。
来源: http://www.phperz.com/article/17/1110/360162.html