jsp substring()函数实现字符串截取方法

str＝str.substring(int beginIndex);截取掉str从首字母起长度为beginIndex的字符串，将剩余字符串赋值给str；

str＝str.substring(int beginIndex，int endIndex);截取str中从beginIndex开始至endIndex结束时的字符串，并将其赋值给str;

实例

public class Utils {
public static String diff(String str1, String str2) {
    int index = str1.lastIndexOf(str2);
    if (index > -1) {
      return str1.substring(str2.length());
    }
    return str1;
}
}

实例二

public class TestSubstring {

public static void main(String[] args) {
String str1 = "fghjkl";
String str2 = str1.substring(1);//从第1号位置开始截取字符串，截到最后,把截取后的返回，赋值给str2
System.out.println("str1 == " + str1);
System.out.println("str2 == " + str2);
}
}

实例三

public static String substring(String str, int start, int end) {
      if (str == null) {
          return null;
      }

      // handle negatives
      if (end < 0) {
          end = str.length() + end; // remember end is negative
      }
      if (start < 0) {
          start = str.length() + start; // remember start is negative
      }

      // check length next
      if (end > str.length()) {
          end = str.length();
      }

      // if start is greater than end, return ""
      if (start > end) {
          return "";
      }

      if (start < 0) {
          start = 0;
      }
      if (end < 0) {
          end = 0;
      }

      return str.substring(start, end);
}

}

补充：Jsp教程,Java技巧及代码