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@@ -0,0 +1,459 @@
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+package cn.com.taiji.algorithm.utils;
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+
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+
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+import cn.hutool.core.text.StrFormatter;
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+
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+import java.util.*;
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+
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+
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+ * 字符串工具类
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+ *
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+ * @author seat
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+ */
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+public class StringUtils extends org.apache.commons.lang3.StringUtils
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+{
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+
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+ private static final String NULLSTR = "";
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+
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+
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+ private static final char SEPARATOR = '_';
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+ private static final String XIA = "_";
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+
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+
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+ * 获取参数不为空值
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+ *
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+ * @param value defaultValue 要判断的value
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+ * @return value 返回值
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+ */
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+ public static <T> T nvl(T value, T defaultValue)
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+ {
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+ return value != null ? value : defaultValue;
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+ }
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+
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+
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+ * * 判断一个Collection是否为空, 包含List,Set,Queue
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+ *
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+ * @param coll 要判断的Collection
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+ * @return true:为空 false:非空
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+ */
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+ public static boolean isEmpty(Collection<?> coll)
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+ {
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+ return isNull(coll) || coll.isEmpty();
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+ }
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+
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+
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+ * * 判断一个Collection是否非空,包含List,Set,Queue
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+ *
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+ * @param coll 要判断的Collection
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+ * @return true:非空 false:空
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+ */
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+ public static boolean isNotEmpty(Collection<?> coll)
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+ {
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+ return !isEmpty(coll);
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+ }
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+
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+
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+ * * 判断一个对象数组是否为空
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+ *
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+ * @param objects 要判断的对象数组
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+ ** @return true:为空 false:非空
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+ */
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+ public static boolean isEmpty(Object[] objects)
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+ {
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+ return isNull(objects) || (objects.length == 0);
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+ }
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+
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+
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+ * * 判断一个对象数组是否非空
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+ *
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+ * @param objects 要判断的对象数组
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+ * @return true:非空 false:空
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+ */
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+ public static boolean isNotEmpty(Object[] objects)
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+ {
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+ return !isEmpty(objects);
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+ }
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+
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+
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+ * * 判断一个Map是否为空
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+ *
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+ * @param map 要判断的Map
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+ * @return true:为空 false:非空
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+ */
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+ public static boolean isEmpty(Map<?, ?> map)
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+ {
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+ return isNull(map) || map.isEmpty();
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+ }
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+
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+
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+ * * 判断一个Map是否为空
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+ *
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+ * @param map 要判断的Map
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+ * @return true:非空 false:空
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+ */
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+ public static boolean isNotEmpty(Map<?, ?> map)
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+ {
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+ return !isEmpty(map);
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+ }
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+
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+
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+ * * 判断一个字符串是否为空串
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+ *
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+ * @param str String
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+ * @return true:为空 false:非空
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+ */
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+ public static boolean isEmpty(String str)
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+ {
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+ return isNull(str) || NULLSTR.equals(str.trim());
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+ }
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+
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+
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+ * * 判断一个字符串是否为非空串
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+ *
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+ * @param str String
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+ * @return true:非空串 false:空串
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+ */
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+ public static boolean isNotEmpty(String str)
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+ {
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+ return !isEmpty(str);
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+ }
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+
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+
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+ * * 判断一个对象是否为空
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+ *
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+ * @param object Object
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+ * @return true:为空 false:非空
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+ */
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+ public static boolean isNull(Object object)
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+ {
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+ return object == null;
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+ }
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+
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+
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+ * * 判断一个对象是否非空
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+ *
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+ * @param object Object
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+ * @return true:非空 false:空
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+ */
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+ public static boolean isNotNull(Object object)
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+ {
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+ return !isNull(object);
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+ }
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+
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+
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+ * * 判断一个对象是否是数组类型(Java基本型别的数组)
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+ *
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+ * @param object 对象
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+ * @return true:是数组 false:不是数组
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+ */
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+ public static boolean isArray(Object object)
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+ {
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+ return isNotNull(object) && object.getClass().isArray();
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+ }
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+
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+
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+ * 去空格
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+ */
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+ public static String trim(String str)
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+ {
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+ return (str == null ? "" : str.trim());
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+ }
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+
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+
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+ * 截取字符串
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+ *
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+ * @param str 字符串
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+ * @param start 开始
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+ * @return 结果
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+ */
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+ public static String substring(final String str, int start)
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+ {
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+ if (str == null)
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+ {
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+ return NULLSTR;
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+ }
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+
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+ if (start < 0)
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+ {
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+ start = str.length() + start;
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+ }
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+
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+ if (start < 0)
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+ {
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+ start = 0;
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+ }
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+ if (start > str.length())
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+ {
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+ return NULLSTR;
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+ }
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+
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+ return str.substring(start);
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+ }
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+
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+
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+ * 截取字符串
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+ *
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+ * @param str 字符串
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+ * @param start 开始
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+ * @param end 结束
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+ * @return 结果
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+ */
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+ public static String substring(final String str, int start, int end)
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+ {
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+ if (str == null)
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+ {
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+ return NULLSTR;
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+ }
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+
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+ if (end < 0)
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+ {
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+ end = str.length() + end;
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+ }
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+ if (start < 0)
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+ {
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+ start = str.length() + start;
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+ }
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+
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+ if (end > str.length())
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+ {
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+ end = str.length();
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+ }
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+
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+ if (start > end)
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+ {
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+ return NULLSTR;
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+ }
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+
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+ if (start < 0)
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+ {
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+ start = 0;
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+ }
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+ if (end < 0)
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+ {
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+ end = 0;
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+ }
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+
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+ return str.substring(start, end);
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+ }
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+
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+
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+ * 格式化文本, {} 表示占位符<br>
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+ * 此方法只是简单将占位符 {} 按照顺序替换为参数<br>
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+ * 如果想输出 {} 使用 \\转义 { 即可,如果想输出 {} 之前的 \ 使用双转义符 \\\\ 即可<br>
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+ * 例:<br>
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+ * 通常使用:format("this is {} for {}", "a", "b") -> this is a for b<br>
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+ * 转义{}: format("this is \\{} for {}", "a", "b") -> this is \{} for a<br>
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+ * 转义\: format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br>
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+ *
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+ * @param template 文本模板,被替换的部分用 {} 表示
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+ * @param params 参数值
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+ * @return 格式化后的文本
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+ */
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+ public static String format(String template, Object... params)
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+ {
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+ if (isEmpty(params) || isEmpty(template))
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+ {
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+ return template;
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+ }
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+ return StrFormatter.format(template, params);
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+ }
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+
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+
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+ * 字符串转set
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+ *
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+ * @param str 字符串
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+ * @param sep 分隔符
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+ * @return set集合
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+ */
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+ public static final Set<String> str2Set(String str, String sep)
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+ {
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+ return new HashSet<String>(str2List(str, sep, true, false));
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+ }
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+
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+
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+ * 字符串转list
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+ *
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+ * @param str 字符串
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+ * @param sep 分隔符
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+ * @param filterBlank 过滤纯空白
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+ * @param trim 去掉首尾空白
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+ * @return list集合
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+ */
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+ public static final List<String> str2List(String str, String sep, boolean filterBlank, boolean trim)
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+ {
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+ List<String> list = new ArrayList<String>();
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+ if (StringUtils.isEmpty(str))
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+ {
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+ return list;
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+ }
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+
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+
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+ if (filterBlank && StringUtils.isBlank(str))
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+ {
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+ return list;
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+ }
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+ String[] split = str.split(sep);
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+ for (String string : split)
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+ {
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+ if (filterBlank && StringUtils.isBlank(string))
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+ {
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+ continue;
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+ }
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+ if (trim)
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+ {
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+ string = string.trim();
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+ }
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+ list.add(string);
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+ }
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+
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+ return list;
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+ }
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+
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+
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+ * 驼峰转下划线命名
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+ */
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+ public static String toUnderScoreCase(String str)
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+ {
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+ if (str == null)
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+ {
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+ return null;
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+ }
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+ StringBuilder sb = new StringBuilder();
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+
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+ boolean preCharIsUpperCase = true;
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+
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+ boolean curreCharIsUpperCase = true;
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+
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+ boolean nexteCharIsUpperCase = true;
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+ for (int i = 0; i < str.length(); i++)
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+ {
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+ char c = str.charAt(i);
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+ if (i > 0)
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+ {
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+ preCharIsUpperCase = Character.isUpperCase(str.charAt(i - 1));
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+ }
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+ else
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+ {
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+ preCharIsUpperCase = false;
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+ }
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+
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+ curreCharIsUpperCase = Character.isUpperCase(c);
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+
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+ if (i < (str.length() - 1))
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+ {
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+ nexteCharIsUpperCase = Character.isUpperCase(str.charAt(i + 1));
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+ }
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+
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+ if (preCharIsUpperCase && curreCharIsUpperCase && !nexteCharIsUpperCase)
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+ {
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+ sb.append(SEPARATOR);
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+ }
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+ else if (i != 0 && !preCharIsUpperCase)
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+ {
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+ if (curreCharIsUpperCase){
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+ sb.append(SEPARATOR);
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+ }
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+ }
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+ sb.append(Character.toLowerCase(c));
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+ }
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+
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+ return sb.toString();
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+ }
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+
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+
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+ * 是否包含字符串
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+ *
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+ * @param str 验证字符串
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+ * @param strs 字符串组
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+ * @return 包含返回true
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+ */
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+ public static boolean inStringIgnoreCase(String str, String... strs)
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+ {
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+ if (str != null && strs != null)
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+ {
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+ for (String s : strs)
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+ {
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+ if (str.equalsIgnoreCase(trim(s)))
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+ {
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+ return true;
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+ }
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+ }
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+ }
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+ return false;
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+ }
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+
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+
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+ * 将下划线大写方式命名的字符串转换为驼峰式。如果转换前的下划线大写方式命名的字符串为空,则返回空字符串。 例如:HELLO_WORLD->HelloWorld
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+ *
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+ * @param name 转换前的下划线大写方式命名的字符串
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+ * @return 转换后的驼峰式命名的字符串
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+ */
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+ public static String convertToCamelCase(String name)
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+ {
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+ StringBuilder result = new StringBuilder();
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+
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+ if (name == null || name.isEmpty())
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+ {
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+
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+ return "";
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+ }
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+ else if (!name.contains(XIA))
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+ {
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+
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+ return name.substring(0, 1).toUpperCase() + name.substring(1);
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+ }
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+
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+ String[] camels = name.split("_");
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+ for (String camel : camels)
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+ {
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+
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+ if (camel.isEmpty())
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+ {
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+ continue;
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+ }
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+
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+ result.append(camel.substring(0, 1).toUpperCase());
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+ result.append(camel.substring(1).toLowerCase());
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+ }
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+ return result.toString();
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+ }
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+
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+
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+ * 驼峰式命名法 例如:user_name->userName
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+ */
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+ public static String toCamelCase(String s)
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+ {
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+ if (s == null)
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+ {
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+ return null;
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+ }
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+ s = s.toLowerCase();
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+ StringBuilder sb = new StringBuilder(s.length());
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+ boolean upperCase = false;
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+ for (int i = 0; i < s.length(); i++)
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+ {
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+ char c = s.charAt(i);
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+
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+ if (c == SEPARATOR)
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+ {
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+ upperCase = true;
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+ }
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+ else if (upperCase)
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+ {
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+ sb.append(Character.toUpperCase(c));
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+ upperCase = false;
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+ }
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+ else
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+ {
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+ sb.append(c);
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+ }
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+ }
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+ return sb.toString();
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+ }
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+
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+ @SuppressWarnings("unchecked")
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+ public static <T> T cast(Object obj)
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+ {
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+ return (T) obj;
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+ }
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+}
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