indexOf substring
如下所示：
1 public static void main(String[] args) 2 { 3 String url = "http://bbs.zqh.com/user/login.html"; 4 System.out.println(url); 5 int a = url.indexOf("/")+2; 6 String surl1 = url.substring(a,url.length()); 7 System.out.println(surl1); 8 int b = surl1.indexOf("/"); 9 String surl2 = surl1.substring(0,b); 10 System.out.println(surl2); 11 int c =surl2.indexOf("."); 12 String url3 = surl2.substring(c,b); 13 System.out.println(url3); 14 }
substring截取从0开始，截取的字符串理解为：str 大于等于起始，小于末尾。
下面是api的demo:
"hamburger".substring(4, 8) returns "urge" "smiles".substring(1, 5) returns "mile"
