驼峰下划线相互转化
package com.iflytek.contractmanage; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Tool { private static Pattern linePattern = Pattern.compile("_(\\w)"); /** * 下划线转驼峰 */ public static String lineToHump(String str) { str = str.toLowerCase(); Matcher matcher = linePattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sb, matcher.group(1).toUpperCase()); } matcher.appendTail(sb); return sb.toString(); } /** * 驼峰转下划线(简单写法,效率低于{@link #humpToLine2(String)}) */ public static String humpToLine(String str) { return str.replaceAll("[A-Z]", "_$0").toLowerCase(); } private static Pattern humpPattern = Pattern.compile("[A-Z]"); /** * 驼峰转下划线,效率比上面高 */ public static String humpToLine2(String str) { Matcher matcher = humpPattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase()); } matcher.appendTail(sb); return sb.toString(); } public static void main(String[] args) { String lineToHump = lineToHump("f_parent_no_leader"); System.out.println(lineToHump);// fParentNoLeader System.out.println(humpToLine(lineToHump));// f_parent_no_leader System.out.println(humpToLine2(lineToHump));// f_parent_no_leader } }
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