package com.code2roc.fastface.util;
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import org.apache.commons.lang3.text.StrBuilder;
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import java.io.File;
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import java.util.regex.Pattern;
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public class StringUtil {
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public static boolean isEmpty(String str) {
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return str == null || "".equals(str) || "null".equals(str);
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}
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public static String padLeft(String src, int len, char ch) {
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int diff = len - src.length();
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if (diff <= 0) {
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return src;
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}
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char[] charr = new char[len];
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System.arraycopy(src.toCharArray(), 0, charr, diff, src.length());
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for (int i = 0; i < diff; i++) {
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charr[i] = ch;
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}
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return new String(charr);
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}
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public static String uncapitalize(String str) {
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int strLen;
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return str != null && (strLen = str.length()) != 0 ? (new StrBuilder(strLen)).append(Character.toLowerCase(str.charAt(0))).append(str.substring(1)).toString() : str;
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}
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public static String getConverPath(String path) {
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return path.replaceAll("\\.", "\\\\") + File.separator;
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}
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//通过正则表达式判断是否是英文字母和数字加下划线和中文
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public static boolean checkIsOnlyContainCharAndNum(String content) {
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content = content.replace("_", "");
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String regex = "^[a-zA-Z0-9_-\u4e00-\u9fa5]*$";
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return Pattern.matches(regex, content);
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}
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//判断关键字后面是否是某个特定的字符
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public static boolean checkFlowChar(String content, String keyword, String followchar, boolean CheckPostfixIsEmpty) {
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int index = content.indexOf(keyword);
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while (index >= 0) {
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if ((index + keyword.length()) >= content.length()) // 如果关键字是最后一个字，没有后续字符
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return false;
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if ((index + keyword.length() + followchar.length()) > content.length()) // 如果关键字后面的字符串不够后续字符串程度
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return false;
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String followchar1 = subString(content,index + keyword.length(), followchar.length());
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if (followchar.equals(followchar1)) {
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if (CheckPostfixIsEmpty) {
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if (index == 0)// 第一个字符就是关键字
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return true;
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else if (subString(content,index - 1, 1) == " ") // 关键字前面是
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return true;
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else if (subString(content,index - CommonUtil.getNewLine().length(), CommonUtil.getNewLine().length()) == CommonUtil.getNewLine()) // 关键字前面是回车
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return true;
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} else {
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return true;
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}
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}
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index = content.indexOf(keyword, index + keyword.length());
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}
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return false;
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}
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//判断Key前面和后面是否是英文字符
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public static boolean checkBeforAfterChar(String Source, String Key) {
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if (StringUtil.isEmpty(Source) || StringUtil.isEmpty(Key))
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return true;
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int index = Source.indexOf(Key);
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while (index >= 0) {
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if (index == 0) {
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if (!checkIsEnglishChar(Source.toCharArray()[Key.length()])) {
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return false;
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}
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} else if (index == Source.length() - Key.length()) {
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if (!checkIsEnglishChar(Source.toCharArray()[index - 1])) {
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return false;
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}
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} else {
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if (!checkIsEnglishChar(Source.toCharArray()[index - 1]) || !checkIsEnglishChar(Source.toCharArray()[index + Key.length()])) {
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return false;
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}
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}
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Source = Source.substring(index + Key.length());
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index = Source.indexOf(Key);
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}
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return true;
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}
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//判断是否是英文字母
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public static boolean checkIsEnglishChar(char c) {
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if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
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return true;
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else
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return false;
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}
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//截取字符串
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public static String subString(String source, int startIndex, int length) {
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return source.substring(startIndex, startIndex + length);
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}
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public static String replaceLast(String text, String regex, String newStr) {
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return text.replaceFirst("(?s)" + regex + "(?!.*?" + regex + ")", newStr);
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}
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}
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