完成StringUtils工具类

src/main/java/cn/codingstar/chero/utils/StringUtils.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright 2016-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package cn.codingstar.chero.utils;
+
+import java.io.UnsupportedEncodingException;
+
+/**
+ * <p>Class: StringUtils</p>
+ * <p>Description: 处理String相关的工具方法</p>
+ * <p>site: www.codingstar.cn</p>
+ *
+ * @autor iCodingStar
+ * @date 2016/6/23 15:44
+ * @since 1.0.0
+ */
+public interface StringUtils {
+
+ /***
+ * 判断字符串是否为空串
+ *
+ * @param s 需要检查的字符串
+ * @return 如果字符串为null或者为空返回true, 否则返回false
+ */
+ static boolean isEmpty(String s) {
+ return s == null || s.trim().length() == 0;
+ }
+
+ /***
+ * 判断字符序列是否为空序列
+ *
+ * @param cs 需要检查的字符序列
+ * @return 如果字符序列为null或者为空返回true, 否则返回false
+ */
+ static boolean isEmpty(final CharSequence cs) {
+ return cs == null || cs.length() == 0;
+ }
+
+ /***
+ * 将字符串转化成UTF-8格式的字节数组
+ *
+ * @param s 需要转化的字符串
+ * @return
+ */
+ static byte[] toBytes(String s) {
+ try {
+ return s.getBytes("UTF-8");
+ } catch (UnsupportedEncodingException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ /***
+ * 将字节数组转化为UTF-8格式的字符串
+ *
+ * @param b 需要转化的字节数组
+ * @return
+ */
+ static String fromBytes(byte[] b) {
+ try {
+ return new String(b, "UTF-8");
+ } catch (UnsupportedEncodingException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ /***
+ * 判断一个字符序列是否为数字
+ *
+ * @param cs 需要判断的字符序列
+ * @return 如果字符序列为数字返回true, 否则返回false
+ */
+ static boolean isNumeric(CharSequence cs) {
+ if (isEmpty(cs)) {
+ return false;
+ }
+ final int length = cs.length();
+ for (int i = 0; i < length; i++) {
+ if (!Character.isDigit(cs.charAt(i))) {
+ return false;
+ }
+ }
+ return true;
+ }
+}