classip { privatestaticlongiptolong(stringstrip) //将127.0.0.1形式的ip地址转换成10进制整数，这里没有进行任何错误处理 { intj=0; inti=0; long[]ip=newlong[4]; intposition1=strip.indexof("."); intposition2=strip.indexof(".",position1+1); intposition3=strip.indexof(".",position2+1); ip[0]=long.parselong(strip.substring(0,position1)); ip[1]=long.parselong(strip.substring(position1+1,position2)); ip[2]=long.parselong(strip.substring(position2+1,position3)); ip[3]=long.parselong(strip.substring(position3+1)); return(ip[0]<<24)+(ip[1]<<16)+(ip[2]<<8)+ip[3];//ip1*256*256*256+ip2*256*256+ip3*256+ip4 } privatestaticstringlongtoip(longlongip) //将10进制整数形式转换成127.0.0.1形式的ip地址，在命令提示符下输入ping3396362403l { stringbuffersb=newstringbuffer(""); sb.append(string.valueof(longip>>>24));//直接右移24位 sb.append("."); sb.append(string.valueof((longip&0x00ffffff)>>>16));//将高8位置0，然后右移16位 sb.append("."); sb.append(string.valueof((longip&0x0000ffff)>>>8)); sb.append("."); sb.append(string.valueof(longip&0x000000ff)); sb.append("."); returnsb.tostring(); } publicstaticvoidmain(string[]args) { system.out.println("ip地址的各种表现形式：rn"); system.out.print("32位二进制形式："); system.out.println(long.tobinarystring(3396362403l)); system.out.print("十进制形式："); system.out.println(iptolong("202.112.96.163")); system.out.print("普通形式："); system.out.println(longtoip(3396362403l)); } }

publicclassIp{ publicstaticvoidmain(String[]args){ System.out.print(ip2int("10.0.3.193")); } publicstaticlongip2int(Stringip){ String[]items=ip.split("."); returnLong.valueOf(items[0])<<24 |Long.valueOf(items[1])<<16 |Long.valueOf(items[2])<<8 |Long.valueOf(items[3]); } }

publicclassIp{ publicstaticvoidmain(String[]args){ System.out.print(int2ip(167773121)); } publicstaticStringint2ip(longipInt){ StringBuildersb=newStringBuilder(); sb.append(ipInt&0xFF).append("."); sb.append((ipInt>>8)&0xFF).append("."); sb.append((ipInt>>16)&0xFF).append("."); sb.append((ipInt>>24)&0xFF); returnsb.toString(); } }