((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)

Pattern p=Pattern.compile("((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)");
Matcher m=p.matcher(strint);
if(m.find())
{
  //headers.put("ip",m.group());
}

ip地址的正则表达式及JAVA的字符串提取方法