??1?public?class?TypeConvert?{
??2??????
??3?????/**
??4??????*?整數到字節數組的轉換
??5??????*/
??6?????public?static?byte[]?intToByte(int?number)?{
??7?????????
??8?????????int?temp?=?number;
??9?????????byte[]?b?=?new?byte[4];
?10?????????for?(int?i?=?b.length?-?1;?i?>?-1;?i--)?{
?11?????????????b[i]?=?new?Integer(temp?&?0xff).byteValue();?//?將最高位保存在最低位
?12?????????????temp?=?temp?>>?8;?//?向右移8位
?13?????????}
?14?????????return?b;
?15?????}
?16?
?17?????/**
?18??????*?字節數組到整數的轉換
?19??????*?@param?b
?20??????*?@return
?21??????*/
?22?????public?static?int?byteToInt(byte[]?b)?{
?23?????????int?s?=?0;
?24?????????for?(int?i?=?0;?i?<?3;?i++)?{
?25?????????????if?(b[i]?>=?0)
?26?????????????????s?=?s?+?b[i];
?27?????????????else
?28?
?29?????????????????s?=?s?+?256?+?b[i];
?30?????????????s?=?s?*?256;
?31?????????}
?32?????????if?(b[3]?>=?0)?//?最后一個之所以不乘，是因為可能會溢出
?33?????????????s?=?s?+?b[3];
?34?????????else
?35?????????????s?=?s?+?256?+?b[3];
?36?????????return?s;
?37?????}
?38?
?39?????/**
?40??????*?字符到字節轉換
?41??????*?@param?ch
?42??????*?@return
?43??????*/
?44?????public?static?byte[]?charToByte(char?ch)?{
?45?????????int?temp?=?(int)?ch;
?46?????????byte[]?b?=?new?byte[2];
?47?????????for?(int?i?=?b.length?-?1;?i?>?-1;?i--)?{
?48?????????????b[i]?=?new?Integer(temp?&?0xff).byteValue();?//?將最高位保存在最低位
?49?????????????temp?=?temp?>>?8;?//?向右移8位
?50?????????}
?51?????????return?b;
?52?????}
?53?
?54?????/**
?55??????*?字節到字符轉換
?56??????*?@param?b
?57??????*?@return
?58??????*/
?59?????public?static?char?byteToChar(byte[]?b)?{
?60?????????int?s?=?0;
?61?????????if?(b[0]?>?0)
?62?????????????s?+=?b[0];
?63?????????else
?64?????????????s?+=?256?+?b[0];
?65?????????s?*=?256;
?66?????????if?(b[1]?>?0)
?67?????????????s?+=?b[1];
?68?????????else
?69?????????????s?+=?256?+?b[1];
?70?????????char?ch?=?(char)?s;
?71?????????return?ch;
?72?????}
?73?
?74?????/**
?75??????*?浮點到字節轉換
?76??????*?@param?d
?77??????*?@return
?78??????*/
?79?????public?static?byte[]?doubleToByte(double?d)?{
?80?????????byte[]?b?=?new?byte[8];
?81?????????long?l?=?Double.doubleToLongBits(d);
?82?????????for?(int?i?=?0;?i?<?b.length;?i++)?{
?83?????????????b[i]?=?new?Long(l).byteValue();
?84?????????????l?=?l?>>?8;
?85?
?86?????????}
?87?????????return?b;
?88?????}
?89?
?90?????/**
?91??????*?字節到浮點轉換
?92??????*?@param?b
?93??????*?@return
?94??????*/
?95?????public?static?double?byteToDouble(byte[]?b)?{
?96?????????long?l;
?97?
?98?????????l?=?b[0];
?99?????????l?&=?0xff;
100?????????l?|=?((long)?b[1]?<<?8);
101?????????l?&=?0xffff;
102?????????l?|=?((long)?b[2]?<<?16);
103?????????l?&=?0xffffff;
104?????????l?|=?((long)?b[3]?<<?24);
105?????????l?&=?0xffffffffl;
106?????????l?|=?((long)?b[4]?<<?32);
107?????????l?&=?0xffffffffffl;
108?
109?????????l?|=?((long)?b[5]?<<?40);
110?????????l?&=?0xffffffffffffl;
111?????????l?|=?((long)?b[6]?<<?48);
112?
113?????????l?|=?((long)?b[7]?<<?56);
114?????????return?Double.longBitsToDouble(l);
115?????}
116?}