怎么在Java项目中利用正则表达式验证IP

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具体方法如下：

package des;import java.util.regex.Matcher;import java.util.regex.Pattern;public class IP {  public static void main(String[] args) { // TODO Auto-generated method stub    IP p=new IP();    String ii="127.0.0.1";    String ii2="127.0.0.";    String ii3="127.0.0.1000";    String ii4="256.0.0.1";    String ii5="127.0.0.gg";    String ii6="127.h.0.1";    String ii7="127.555.0.1";    String ii8="127.00.0.1";    String ii9="127.0.04.1";    String ii10="127.100.#.1";    String ii11="127.*.0.1";    String ii12="127.0.0.000";    String ii13="192.168.3.12";    System.out.println("来自 www.jb51.net 的测试结果：");    p.isMatches(ii);    p.isMatches(ii2);    p.isMatches(ii3);    p.isMatches(ii4);    p.isMatches(ii5);    p.isMatches(ii6);    p.isMatches(ii7);    p.isMatches(ii8);    p.isMatches(ii9);    p.isMatches(ii10);    p.isMatches(ii11);    p.isMatches(ii12);    p.isMatches(ii13); } public boolean isMatches(String ip){ boolean flag=false; try{//  String regex="[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+";  String regex="^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$";  //正确的是//String regex="^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$";//  String regex="\\b((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\b";  Pattern p=Pattern.compile(regex);  Matcher m=p.matcher(ip);  if(m.find()){   System.out.println("successss");  return true;  }else{  System.out.println("falsss");  } }catch(Exception e){  e.printStackTrace(); } return flag; }}