搞分在线等待帮组（关于数据类型转换）

[patriot_cool]

请问怎样把一个string类型变成二进制数呢？谢谢你的帮组

[xiaoyoung]

什么意思，数字就是用二进制方式存在计算机里的呀？
你是不是要转换成二进制的字符串输出？

java.lang.Integer.toBinaryString( java.lang.Integer.valueOf( str ).intValue() );

[zxhong]

http://expert.csdn.net/Expert/topic/1432/1432875.xml?temp=.8989984

[patriot_cool]

但是我的字符串中不是数字呀，而是像“aaa”这种！

[patriot_cool]

还有，我如何得到的二进制转换成字符串呀？

[hoxisoft]

//转过去

char temChr ;
int ascChr ;
int i ;
String ss = "" ;
String rtStr = "地从" ;
int length = rtStr.length() ;
for ( i = 0 ; i < length ; i++ )
{
temChr = rtStr.charAt( i ) ;
ascChr = temChr + 0 ;
ss = ss + "&#x" + Integer.toHexString( ascChr ) + ";" ;

//转回来

String sArray[] = ss.split(";");
byte bArray[] = new byte[2 * sArray.length];
for (i = 0 ; i < sArray.length; i++) {
try {
int tmp = Integer.parseInt(sArray[i].substring(3), 16);
System.out.println(">>>>>int value is " + sArray[i].substring(3));
bArray[i*2 + 1] = (byte)(tmp & 0xff);
bArray[i*2 ] = (byte)((tmp >> 8) & 0xff);
} catch (NumberFormatException e) {
e.printStackTrace();
}
}
System.out.println("convert to orginal String is " + new String(bArray));

[bluesmile979]

自己写

String s = "abcdefgh";
byte[] b = s.getBytes();
int[] r = new int[ b.length * 8 ];
for ( int i = 0; i < b.length; i++ ){
int t = 128;
for ( int j = 0; j < 8; j++ ){
r[ i * 8 + j] = ( ( int ) b[ i ] & t ) == 0 ? 0 : 1;
t = t >> 1;
}
}

int num = r.length / 8;
char[] bb = new char[num];
for ( int i = 0; i < num; i++ ){
bb[ i ] = 0;
for ( int j = 0; j < 8; j++ ){
bb[ i ] = ( char ) ( bb[ i ] << 1 );
bb[ i ] = ( char ) ( bb[ i ] | r[ i * 8 + j ] );
}
}