java 怎么把字符串192.0.0.1变成192.000.000.001

import java.text.DecimalFormat;
import java.util.Scanner;

public class Test {

public static void main(String[] args) {
String str = "192.0.0.1";
String[] array = new String[]{};

array = str.split("[.]");

StringBuffer strBuf = new StringBuffer();
DecimalFormat format = new DecimalFormat("000");

for (int i = 0; i < array.length; i++) {
strBuf.append(format.format(Integer.parseInt(array[i])));
strBuf.append(".");
}
strBuf.delete(strBuf.length() - 1, strBuf.length());

System.out.println(strBuf.toString());
}
}