:驼峰与下划线之间互转工具类

时间:2025-02-13 11:06:22
package org.bood.common.utils; /** * <p> * 驼峰与下划线之间互转工具类 * </p> * * @author:bood * @date:2020/10/16 */ public class CamelCaseUtil { private static final char SEPARATOR = '_'; public CamelCaseUtil() { } /** * <p> * 转下划线 * </p> * * @param s: * @return: * @author:bood * @date:2020/10/16 */ public static String toUnderlineName(String s) { if (s == null) { return null; } StringBuilder sb = new StringBuilder(); boolean upperCase = false; for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); boolean nextUpperCase = true; if (i < (s.length() - 1)) { nextUpperCase = Character.isUpperCase(s.charAt(i + 1)); } if ((i >= 0) && Character.isUpperCase(c)) { if (!upperCase || !nextUpperCase) { if (i > 0) sb.append(SEPARATOR); } upperCase = true; } else { upperCase = false; } sb.append(Character.toLowerCase(c)); } return sb.toString(); } /** * <p> * 转驼峰 * </p> * * @param s: * @return: * @author:bood * @date:2020/10/16 */ public static String toCamelCase(String s) { if (s == null) { return null; } s = s.toLowerCase(); StringBuilder sb = new StringBuilder(s.length()); boolean upperCase = false; for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c == SEPARATOR) { upperCase = true; } else if (upperCase) { sb.append(Character.toUpperCase(c)); upperCase = false; } else { sb.append(c); } } return sb.toString(); } /** * <p> * 转大写驼峰 * </p> * * @param s: * @return: * @author:bood * @date:2020/10/16 */ public static String toCapitalizeCamelCase(String s) { if (s == null) { return null; } s = toCamelCase(s); return s.substring(0, 1).toUpperCase() + s.substring(1); } }