java中int、string、byte数组类型ip地址相互转化

public static String (int ip) {
    StringBuffer sb=new StringBuffer();
 int b=(ip>>0)&0xff;
   sb.append(b+".");
    b=(ip>>8)&0xff;
    sb.append(b+".");
    b=(ip>>16)&0xff;
   sb.append(b+".");
    b=(ip>>24)&0xff;
   sb.append(b);
    return sb.toString();
}
//string转int
public static int string2int(String ip) {
   String[] ss=ip.split("\.");
  byte[] bs=new byte[4];
    for(int i=0;i<4;++i) {
      bs[i]=Integer.valueOf(ss[i]).byteValue();
    }
    return bytes2int(bs);
}
//int转byte数组
public static byte[] int2bytes(int ip) {
    byte[] src = new byte[4];
 src[3] =  (byte) ((ip>>24) & 0xFF);
   src[2] =  (byte) ((ip>>16) & 0xFF);
   src[1] =  (byte) ((ip>>8) & 0xFF);  
  src[0] =  (byte) (ip & 0xFF);              
 return src;
}
//byte数组转int
public static int bytes2int(byte[] ip) {
 int value; 
 value = (int) ((ip[0] & 0xFF) 
          | ((ip[1] & 0xFF)<<8) 
         | ((ip[2] & 0xFF)<<16) 
            | ((ip[3] & 0xFF)<<24));
   return value;
}