Java程序对二进制流的读写

把字符串和整数放到二进制流

private void valuecpy(byte[] b,int start, int end,String strMsg){byte[] cs = strMsg.getBytes();for(byte c : cs){b[start] = c;start++;if(start>=end)break;}}private void valuecpy(byte[] b,int start, int end,int nValue){b[start] =(byte)(nValue&0x000000ff) ;b[start+1]=(byte)( (nValue&0x0000ff00) >> 8) ;b[start+2]=(byte)( (nValue&0x00ff0000) >> 16) ;b[start+3]=(byte)( (nValue&0xff000000) >> 24) ;}

从二进制流中取字符串和整数

private int getIntValue(byte [] b,int s,int e){int nR=0;if(s+3<e){nR = b[s] & 0xff;nR = nR + ( b[s+1]<<8 & 0x0000ff00 );nR = nR + ( b[s+2]<<16 & 0x00ff0000 );nR = nR + ( b[s+3]<<24 & 0xff000000 );}return nR;}private String getStrValue(byte[] b,int s,int e){byte[] tb=new byte[e-s+1];int i=0;for(byte ee:tb){tb[i++]=0;}i=0;for(byte ee:b){if(i>=s && i<e){tb[i-s]= b[i];}else if(i>=e){break;}i++;}String r=new String(tb);return r;}

 

其它可能要用到的函数

private void ZeroMem(){int i=0;m_packet = new byte[1024];for(byte c:m_packet){m_packet[i++]=0;}}

这样C语言中struct结构体变量可以对应到二进制流，而Java程序就可以从二进制流中取数据