459 lines
12 KiB
Java
459 lines
12 KiB
Java
package com.ruoyi.common.utils;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import com.ruoyi.common.core.text.StrFormatter;
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/**
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* 字符串工具类
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*
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* @author ruoyi
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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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/** 空字符串 */
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private static final String NULLSTR = "";
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/** 下划线 */
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private static final char SEPARATOR = '_';
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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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* * 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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* 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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* 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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if (start < 0)
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{
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start = str.length() + start;
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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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return str.substring(start);
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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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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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if (end > str.length())
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{
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end = str.length();
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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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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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return str.substring(start, end);
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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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* 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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* 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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// 过滤空白字符串
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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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return list;
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}
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/**
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* 下划线转驼峰命名
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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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// 前置字符是否大写
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boolean preCharIsUpperCase = true;
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// 当前字符是否大写
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boolean curreCharIsUpperCase = true;
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// 下一字符是否大写
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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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curreCharIsUpperCase = Character.isUpperCase(c);
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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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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) && curreCharIsUpperCase)
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{
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sb.append(SEPARATOR);
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}
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sb.append(Character.toLowerCase(c));
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}
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return sb.toString();
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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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* 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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// 快速检查
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if (name == null || name.isEmpty())
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{
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// 没必要转换
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return "";
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}
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else if (!name.contains("_"))
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{
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// 不含下划线,仅将首字母大写
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return name.substring(0, 1).toUpperCase() + name.substring(1);
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}
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// 用下划线将原始字符串分割
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String[] camels = name.split("_");
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for (String camel : camels)
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{
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// 跳过原始字符串中开头、结尾的下换线或双重下划线
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if (camel.isEmpty())
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{
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continue;
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}
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// 首字母大写
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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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* 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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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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@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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} |