32位二进制IP地址与十进制IP地址互相转换

代码：

 import java.util.List;

 import java.util.ArrayList;

 import java.util.Scanner;

 public class Transformation {

   public static void main(String[] args)throws Exception {

               String a;

               boolean b;

                 Scanner in=new Scanner(System.in);

                     System.out.println("请输入IP地址或32位2进制数");

                     a=in.next();

                     if((b=a.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"))) {

                     System.out.println("IP地址转2进制");

                         String[] array = a.split("\\.");

                   /*  for ( int i=0; i < array.length; i++) {

                             System.out.println(array[i]);

                             }*/

                         int[] intTemp = new int[array.length];

                         for (int i=0; i <array.length; i++)

                             {

                             intTemp[i] = Integer.parseInt(array[i]);

                             }

                         for (int i=0;i<intTemp.length ;i++)

                         {

                             int c =intTemp[i];

                             String binaryString = Integer.toBinaryString(c);//

                             int binaryInt = Integer.parseInt(binaryString);//

                             System.out.print(String.format("%08d",binaryInt));//

                         }

                }

                     else if(b=a.matches("\\d{32}")) {

                     System.out.println("2进制转iP地址");

                  /*

                      for(int i = 0; i < a.length(); i++){

                          arr[i] = a.substring(0,8);

                          result.add(tmp)

                          a= a.substring(8);

                         // System.out.println(arr[i]);*/

                          List<String> result = new ArrayList<String>();

                             int iPos = 0;

                             int iLen = a.length();

                             while(iLen>=8){

                                 String tmp = a.substring(0, 8);

                                 result.add(tmp);

                                 a= a.substring(8);

                                 iLen = a.length();

                             }

                             for(String st:result){

                                 System.out.print(Integer.parseInt(st,2));

                                 System.out.print(".");

                             }

                          }

                     else {

                     System.out.println("非法的输入！！！！");

                 }

             }

         }