下划线格式驼峰格式互相转化

最新推荐文章于 2024-01-24 10:32:26 发布

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最新推荐文章于 2024-01-24 10:32:26 发布

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分类专栏：下划线格式驼峰格式转化文章标签： java

本文链接：https://blog.youkuaiyun.com/qq_41347397/article/details/108124948

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本文介绍如何在Java中实现下划线格式字符串到驼峰格式的转换，以及从驼峰格式转换为下划线格式的方法。

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下划线格式转驼峰，驼峰格式转下划线

package com.jyd.prs.biz.util;

public class CamelCaseUtils {

    private static final char SEPARATOR = '_';

    //驼峰转下划线格式
    private 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();
    }

    //下划线转驼峰格式
    private 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 if (i == 0) {//如果需要驼峰形式首字母大写请放开
                sb.append(Character.toUpperCase(c));
            }*/
            else {
                sb.append(c);
            }
        }

        return sb.toString();
    }

    private static String toCapitalizeCamelCase(String s) {
        if (s == null) {
            return null;
        }
        s = toCamelCase(s);
        return s.substring(0, 1).toUpperCase() + s.substring(1);
    }

    public static void main(String[] args) {
        System.out.println(CamelCaseUtils.toUnderlineName("ISOCertifiedStaff"));
        System.out.println(CamelCaseUtils.toUnderlineName("CertifiedStaff"));
        System.out.println(CamelCaseUtils.toUnderlineName("UserID"));
        System.out.println(CamelCaseUtils.toCamelCase("iso_certified_staff"));
        System.out.println(CamelCaseUtils.toCamelCase("certified_staff"));
        System.out.println(CamelCaseUtils.toCamelCase("user_id"));
    }

}