package com.ruoyi.web.controller.yuncang.utils;
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/**
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* 字符串工具类。
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*
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*/
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public abstract class StringUtils {
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private StringUtils() {}
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/**
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* 检查指定的字符串是否为空。
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* <ul>
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* <li>SysUtils.isEmpty(null) = true</li>
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* <li>SysUtils.isEmpty("") = true</li>
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* <li>SysUtils.isEmpty(" ") = true</li>
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* <li>SysUtils.isEmpty("abc") = false</li>
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* </ul>
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*
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* @param value 待检查的字符串
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* @return true/false
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*/
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public static boolean isEmpty(String value) {
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int strLen;
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if (value == null || (strLen = value.length()) == 0) {
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return true;
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}
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for (int i = 0; i < strLen; i++) {
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if ((Character.isWhitespace(value.charAt(i)) == false)) {
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return false;
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}
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}
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return true;
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}
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/**
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* 检查对象是否为数字型字符串,包含负数开头的。
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*/
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public static boolean isNumeric(Object obj) {
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if (obj == null) {
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return false;
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}
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char[] chars = obj.toString().toCharArray();
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int length = chars.length;
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if(length < 1)
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return false;
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int i = 0;
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if(length > 1 && chars[0] == '-')
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i = 1;
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for (; i < length; i++) {
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if (!Character.isDigit(chars[i])) {
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return false;
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}
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}
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return true;
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}
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/**
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* 检查指定的字符串列表是否不为空。
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*/
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public static boolean areNotEmpty(String... values) {
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boolean result = true;
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if (values == null || values.length == 0) {
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result = false;
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} else {
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for (String value : values) {
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result &= !isEmpty(value);
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}
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}
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return result;
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}
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/**
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* 把通用字符编码的字符串转化为汉字编码。
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*/
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public static String unicodeToChinese(String unicode) {
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StringBuilder out = new StringBuilder();
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if (!isEmpty(unicode)) {
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for (int i = 0; i < unicode.length(); i++) {
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out.append(unicode.charAt(i));
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}
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}
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return out.toString();
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}
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public static String toUnderlineStyle(String name) {
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StringBuilder newName = new StringBuilder();
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for (int i = 0; i < name.length(); i++) {
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char c = name.charAt(i);
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if (Character.isUpperCase(c)) {
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if (i > 0) {
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newName.append("_");
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}
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newName.append(Character.toLowerCase(c));
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} else {
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newName.append(c);
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}
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}
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return newName.toString();
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}
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public static String convertString(byte[] data, int offset, int length) {
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if (data == null) {
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return null;
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} else {
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try {
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return new String(data, offset, length, "UTF-8");
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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public static byte[] convertBytes(String data) {
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if (data == null) {
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return null;
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} else {
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try {
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return data.getBytes("UTF-8");
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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}
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