java 驼峰和下划线互相转换

其实是很简单的正则表达式转换

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直接上代码

    /**
     * 驼峰转下划线
     * @param str   目标字符串
     * @return: 
     */
    public static String humpToUnderline(String str) {
        String regex = "([A-Z])";
        Matcher matcher = Pattern.compile(regex).matcher(str);
        while (matcher.find()) {
            String target = matcher.group();
            str = str.replaceAll(target, "_"+target.toLowerCase());
        }
        return str;
    }

    /**
     * 下划线转驼峰
     * @param str   目标字符串
     * @return: 
     */
    public static String underlineToHump(String str) {
        String regex = "_(.)";
        Matcher matcher = Pattern.compile(regex).matcher(str);
        while (matcher.find()) {
            String target = matcher.group(1);
            str = str.replaceAll("_"+target, target.toUpperCase());
        }
        return str;
    }

测试

System.out.println(humpToUnderline("humpToUnderline"));
System.out.println(underlineToHump("hump_to_underline"));

结果

hump_to_underline
humpToUnderline

js 版的更加简单: /qq_31254489/article/details/115843025