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最新评论
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xiaoxin:
(⊙o⊙)… 我到现在才知道,QQQ
Runtime.getRuntime().exec()常见问题 -
uuhorse:
不错,解决了困扰我许久的问题,都准备搞flex了
js判断上传文件大小 -
fenghoer:
ie下不好用??
js判断上传文件大小
public class ByteConvert { // 以下 是整型数 和 网络字节序的 byte[] 数组之间的转换 public static byte[] longToBytes(long n) { byte[] b = new byte[8]; b[7] = (byte) (n & 0xff); b[6] = (byte) (n >> 8 & 0xff); b[5] = (byte) (n >> 16 & 0xff); b[4] = (byte) (n >> 24 & 0xff); b[3] = (byte) (n >> 32 & 0xff); b[2] = (byte) (n >> 40 & 0xff); b[1] = (byte) (n >> 48 & 0xff); b[0] = (byte) (n >> 56 & 0xff); return b; } public static void longToBytes( long n, byte[] array, int offset ){ array[7+offset] = (byte) (n & 0xff); array[6+offset] = (byte) (n >> 8 & 0xff); array[5+offset] = (byte) (n >> 16 & 0xff); array[4+offset] = (byte) (n >> 24 & 0xff); array[3+offset] = (byte) (n >> 32 & 0xff); array[2+offset] = (byte) (n >> 40 & 0xff); array[1+offset] = (byte) (n >> 48 & 0xff); array[0+offset] = (byte) (n >> 56 & 0xff); } public static long bytesToLong( byte[] array ) { return ((((long) array[ 0] & 0xff) << 56) | (((long) array[ 1] & 0xff) << 48) | (((long) array[ 2] & 0xff) << 40) | (((long) array[ 3] & 0xff) << 32) | (((long) array[ 4] & 0xff) << 24) | (((long) array[ 5] & 0xff) << 16) | (((long) array[ 6] & 0xff) << 8) | (((long) array[ 7] & 0xff) << 0)); } public static long bytesToLong( byte[] array, int offset ) { return ((((long) array[offset + 0] & 0xff) << 56) | (((long) array[offset + 1] & 0xff) << 48) | (((long) array[offset + 2] & 0xff) << 40) | (((long) array[offset + 3] & 0xff) << 32) | (((long) array[offset + 4] & 0xff) << 24) | (((long) array[offset + 5] & 0xff) << 16) | (((long) array[offset + 6] & 0xff) << 8) | (((long) array[offset + 7] & 0xff) << 0)); } public static byte[] intToBytes(int n) { byte[] b = new byte[4]; b[3] = (byte) (n & 0xff); b[2] = (byte) (n >> 8 & 0xff); b[1] = (byte) (n >> 16 & 0xff); b[0] = (byte) (n >> 24 & 0xff); return b; } public static void intToBytes( int n, byte[] array, int offset ){ array[3+offset] = (byte) (n & 0xff); array[2+offset] = (byte) (n >> 8 & 0xff); array[1+offset] = (byte) (n >> 16 & 0xff); array[offset] = (byte) (n >> 24 & 0xff); } public static int bytesToInt(byte b[]) { return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16 | (b[0] & 0xff) << 24; } public static int bytesToInt(byte b[], int offset) { return b[offset+3] & 0xff | (b[offset+2] & 0xff) << 8 | (b[offset+1] & 0xff) << 16 | (b[offset] & 0xff) << 24; } public static byte[] uintToBytes( long n ) { byte[] b = new byte[4]; b[3] = (byte) (n & 0xff); b[2] = (byte) (n >> 8 & 0xff); b[1] = (byte) (n >> 16 & 0xff); b[0] = (byte) (n >> 24 & 0xff); return b; } public static void uintToBytes( long n, byte[] array, int offset ){ array[3+offset] = (byte) (n ); array[2+offset] = (byte) (n >> 8 & 0xff); array[1+offset] = (byte) (n >> 16 & 0xff); array[offset] = (byte) (n >> 24 & 0xff); } public static long bytesToUint(byte[] array) { return ((long) (array[3] & 0xff)) | ((long) (array[2] & 0xff)) << 8 | ((long) (array[1] & 0xff)) << 16 | ((long) (array[0] & 0xff)) << 24; } public static long bytesToUint(byte[] array, int offset) { return ((long) (array[offset+3] & 0xff)) | ((long) (array[offset+2] & 0xff)) << 8 | ((long) (array[offset+1] & 0xff)) << 16 | ((long) (array[offset] & 0xff)) << 24; } public static byte[] shortToBytes(short n) { byte[] b = new byte[2]; b[1] = (byte) ( n & 0xff); b[0] = (byte) ((n >> 8) & 0xff); return b; } public static void shortToBytes(short n, byte[] array, int offset ) { array[offset+1] = (byte) ( n & 0xff); array[offset] = (byte) ((n >> 8) & 0xff); } public static short bytesToShort(byte[] b){ return (short)( b[1] & 0xff |(b[0] & 0xff) << 8 ); } public static short bytesToShort(byte[] b, int offset){ return (short)( b[offset+1] & 0xff |(b[offset] & 0xff) << 8 ); } public static byte[] ushortToBytes(int n) { byte[] b = new byte[2]; b[1] = (byte) ( n & 0xff); b[0] = (byte) ((n >> 8) & 0xff); return b; } public static void ushortToBytes(int n, byte[] array, int offset ) { array[offset+1] = (byte) ( n & 0xff); array[offset] = (byte) ((n >> 8) & 0xff); } public static int bytesToUshort(byte b[]) { return b[1] & 0xff | (b[0] & 0xff) << 8; } public static int bytesToUshort(byte b[], int offset) { return b[offset+1] & 0xff | (b[offset] & 0xff) << 8; } public static byte[] ubyteToBytes( int n ){ byte[] b = new byte[1]; b[0] = (byte) (n & 0xff); return b; } public static void ubyteToBytes( int n, byte[] array, int offset ){ array[0] = (byte) (n & 0xff); } public static int bytesToUbyte( byte[] array ){ return array[0] & 0xff; } public static int bytesToUbyte( byte[] array, int offset ){ return array[offset] & 0xff; } // char 类型、 float、double 类型和 byte[] 数组之间的转换关系还需继续研究实现。 }
public class ByteConvertTest { public static String byte2Hex(byte[] buf) { StringBuffer strbuf = new StringBuffer(); strbuf.append("{"); for (byte b : buf) { if (b == 0) { strbuf.append("00"); } else if (b == -1) { strbuf.append("FF"); } else { String str = Integer.toHexString(b).toUpperCase(); // sb.append(a); if (str.length() == 8) { str = str.substring(6, 8); } else if (str.length() < 2) { str = "0" + str; } strbuf.append(str); } strbuf.append(" "); } strbuf.append("}"); return strbuf.toString(); } public static byte[] longToBytes(long n) { byte[] b = new byte[8]; b[7] = (byte) (n & 0xff); b[6] = (byte) (n >> 8 & 0xff); b[5] = (byte) (n >> 16 & 0xff); b[4] = (byte) (n >> 24 & 0xff); b[3] = (byte) (n >> 32 & 0xff); b[2] = (byte) (n >> 40 & 0xff); b[1] = (byte) (n >> 48 & 0xff); b[0] = (byte) (n >> 56 & 0xff); return b; } public static long bytesToLong( byte[] array ) { return ((((long) array[ 0] & 0xff) << 56) | (((long) array[ 1] & 0xff) << 48) | (((long) array[ 2] & 0xff) << 40) | (((long) array[ 3] & 0xff) << 32) | (((long) array[ 4] & 0xff) << 24) | (((long) array[ 5] & 0xff) << 16) | (((long) array[ 6] & 0xff) << 8) | (((long) array[ 7] & 0xff) )); } public static int bytesToInt(byte b[]) { return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16 | (b[0] & 0xff) << 24; } public static long bytesToUint(byte[] array) { return ((long) (array[3] & 0xff)) | ((long) (array[2] & 0xff)) << 8 | ((long) (array[1] & 0xff)) << 16 | ((long) (array[0] & 0xff)) << 24; } public static byte[] uintToBytes( long n ) { byte[] b = new byte[4]; b[3] = (byte) (n & 0xff); b[2] = (byte) (n >> 8 & 0xff); b[1] = (byte) (n >> 16 & 0xff); b[0] = (byte) (n >> 24 & 0xff); return b; } public static byte[] shortToBytes(short n) { byte[] b = new byte[2]; b[1] = (byte) ( n & 0xff); b[0] = (byte) ((n >> 8) & 0xff); return b; } public static short bytesToShort(byte[] b){ return (short)( b[1] & 0xff |(b[0] & 0xff) << 8 ); } static void testShortConvert(){ System.out.println("=================== short convert ============="); System.out.println("byte2Hex(shortToBytes((short)0x11f2))"+byte2Hex(shortToBytes((short)0x11f2))); System.out.print("println 0x11f2:"); System.out.println((short)0x11f2); System.out.println("byte2Hex(shortToBytes((short)0xf1f2))"+byte2Hex(shortToBytes((short)0xf1f2))); System.out.print("println 0xf1f2:"); System.out.println((short)0xf1f2); System.out.print("println bytesToShort(shortToBytes((short)0x11f2)):"); System.out.println((short)bytesToShort(shortToBytes((short)0x11f2))); System.out.print("println bytesToShort(shortToBytes((short)0xf1f2)):"); System.out.println((short)bytesToShort(shortToBytes((short)0xf1f2))); } public static byte[] ushortToBytes(int n) { byte[] b = new byte[2]; b[1] = (byte) (n & 0xff); b[0] = (byte) (n >> 8 & 0xff); return b; } public static int bytesToUshort(byte b[]) { return b[1] & 0xff | (b[0] & 0xff) << 8; } static void testUshortConvert(){ System.out.println("=================== Ushort convert ============="); System.out.println("byte2Hex(ushortToBytes(0x11f2))"+byte2Hex(ushortToBytes(0x11f2))); System.out.print("println 0x11f2:"); System.out.println(0x11f2); System.out.println("byte2Hex(ushortToBytes(0xf1f2))"+byte2Hex(ushortToBytes(0xf1f2))); System.out.print("println 0xf1f2:"); System.out.println(0xf1f2); System.out.print("println bytesToUshort(ushortToBytes(0x11f2)):"); System.out.println(bytesToUshort(ushortToBytes(0x11f2))); System.out.print("println bytesToUshort(ushortToBytes(0xf1f2)):"); System.out.println(bytesToUshort(ushortToBytes(0xf1f2))); } public static byte[] ubyteToBytes( int n ){ byte[] b = new byte[1]; b[0] = (byte) (n & 0xff); return b; } public static int bytesToUbyte( byte[] array ){ return array[0] & 0xff; } static void testUbyteConvert(){ System.out.println("=================== Ubyte convert ============="); System.out.println("byte2Hex(ubyteToBytes(0x1112))"+byte2Hex(ubyteToBytes(0x1112))); System.out.print("println 0x1112:"); System.out.println(0x1112); System.out.println("byte2Hex(ubyteToBytes(0xf2))"+byte2Hex(ubyteToBytes(0xf2))); System.out.print("println 0xf2:"); System.out.println(0xf2); System.out.print("println bytesToUbyte(ubyteToBytes(0x1112)):"); System.out.println(bytesToUbyte(ubyteToBytes(0x1112))); System.out.print("println bytesToUbyte(ubyteToBytes(0xf1f2)):"); System.out.println(bytesToUbyte(ubyteToBytes(0xf1f2))); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub byte[] array = new byte[4]; array[3] = (byte) 0xF4; array[2] = 0x13; array[1] = 0x12; array[0] = 0x11; System.out.println("=================== Integer bytes ============="); System.out.println("the bytes is:"+byte2Hex(array) ); System.out.print("println bytesToInt :"); System.out.println( bytesToInt(array)); System.out.printf("printf bytesToInt :%X\n", bytesToInt(array)); System.out.println("=================== long bytes ============="); byte[] longBytes = new byte[8]; longBytes[7] = (byte) 0xf7; longBytes[6] = (byte) 0x16; longBytes[5] = (byte) 0xf5; longBytes[4] = (byte) 0x14; longBytes[3] = (byte) 0xf3; longBytes[2] = (byte) 0x12; longBytes[1] = (byte) 0xf1; longBytes[0] = (byte) 0x10; System.out.println( "the bytes is:"+byte2Hex(longBytes) ); System.out.printf("printf bytesToLong:%X\n",bytesToLong(longBytes)); System.out.println("=================byte to long ================"); byte b = (byte)0xf1; System.out.print("Println the byte:"); System.out.println(b); System.out.printf("Printf the byte:%X\n",b); long l = b; System.out.print("Println byte to long:"); System.out.println(l); System.out.printf("printf byte to long:%X\n",l); System.out.println("================= uint Bytes ================"); byte[] uint = new byte[4]; uint[3] = (byte) 0xf3; uint[2] = (byte) 0x12; uint[1] = (byte) 0xf1; uint[0] = (byte) 0xFF; System.out.println( "the bytes is:"+byte2Hex(uint) ); System.out.printf("printf bytesToUint:%X\n",bytesToUint(uint)); System.out.print("Println bytesToUint:"); System.out.println(bytesToUint(uint)); System.out.println("byte2Hex(uintToBytes(0x11f2f3f4f5f6f7f8l)):"+byte2Hex(uintToBytes(0x11f2f3f4f5f6f7f8l))); System.out.println("===============Long Integer=============="); System.out.print("println 0x11f2f3f4f5f6f7f8l:"); System.out.println(0x11f2f3f4f5f6f7f8l); System.out.printf("Printf 0x11f2f3f4f5f6f7f8l:%X\n",0x11f2f3f4f5f6f7f8l); System.out.println("println byte2Hex(longToBytes(0x11f2f3f4f5f6f7f8l))"+byte2Hex(longToBytes(0x11f2f3f4f5f6f7f8l))); // 注意,下面的这行,并不能获得正确的uint。 System.out.printf("printf bytesToUint(longToBytes(0x11f2f3f4f5f6f7f8l):%X\n",bytesToUint(longToBytes(0x11f2f3f4f5f6f7f8l))); System.out.println("===============bytesToLong(longToBytes())=============="); System.out.println(bytesToLong(longToBytes(0x11f2f3f4f5f6f7f8l))); System.out.printf("%X\n",bytesToLong(longToBytes(0x11f2f3f4f5f6f7f8l))); testShortConvert(); testUshortConvert(); testUbyteConvert(); } }
发表评论
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java读取文件及文件流
2012-02-24 14:44 1220//java读取文件或是文件流的代码,涵盖了读取jar文 ... -
读写二进制文件到字节数组
2012-02-23 15:59 0public class DiskTest { pu ... -
java读写二进制文件
2012-02-23 12:09 5900写入二进制文件,用ultraEdit打开看data1.dat, ... -
java编码
2012-02-22 13:15 4723从基础的开始最小的单元是位(bit),接着是字节(Byte), ... -
处理 Java 程序中的内存漏洞? 研究何时应该关注内存漏洞以及如何预防内存漏洞
2012-02-22 11:32 1238研究何时应该关注内存漏洞以及如何预防内存漏洞 (作者: ... -
阻塞队列 查找文件夹下文件,匹配出指定字符的文件名、行数、该行语句
2011-11-30 15:05 1139public class BlockingQueueTest ... -
读写txt文件
2011-11-21 14:33 952读取txt文件: /** * 读取txt文件的 ... -
解析算术表达式
2011-11-21 14:01 1097现有字符串形式的算术表达式,求计算其值。 Strin ... -
struts2 解决上传问题
2011-11-16 18:10 886记录下最近接触的用struct上传文件的方法。 ... -
队列处理
2011-11-16 17:40 728在做项目的时候有这个需求:用户提交请求需要排队处理(先来 ... -
Runtime.getRuntime().exec()常见问题
2011-11-15 16:14 24273JAVA调用一个bat批处理程序,调用几十次后会莫名的不再执 ... -
dom增删改查xml文件
2011-11-14 10:25 3213public class DOMForXml { ... -
多线程——waiting-notify机制实例(三个人打水)
2011-11-09 11:03 911//三个学生到一个水龙头下排队取水,三人都取完水后一起离 ... -
数字格式化
2011-03-22 11:00 823double pi=3.1415927; //圆周率 ...
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