Question

java 判断字符串是否是url

Answer 1

正则表达式撒

追问

具体正则表达式怎么写？

追答

这个.....我也不是很会,给你一个例子吧

//用于检索URL的正则表达式

private static String regex = "((http://)?([a-z]+[.])|(www.))\\w+[.]([a-z]{2,4})?[[.]([a-z]{2,4})]+((/[\\S&&[^,;\u4E00-\u9FA5]]+)+)?([.][a-z]{2,4}+|/?)";
private static String A1 = " ";
private static String A2 = " ";

//检索出URL并附加标记

public static String toHref(String title) {
StringBuffer sb = new StringBuffer(title);
Pattern pat = Pattern.compile(regex);
Matcher mat = pat.matcher(title);
int index = 0;
int index1 = 0;
while (mat.find()) {
String url = mat.group();
//System.out.println(url);
if (url.indexOf("http://") != 0)
url = "http://" + url;
Object obj[] = { "'" + url + "'" };
String a = MessageFormat.format(A1, obj);
int l = a.length();
index += index1;
sb.insert(mat.start() + index, a);
index += l;
sb.insert((mat.end()) + index, A2);
index1 = A2.length();
}
return sb.toString();
}

Answer 2

mark一下