com.sinszm.common.util.CamelAndUnderLineConverter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of szm-boot-common Show documentation

There is a newer version: 1.1.3.RELEASE

package com.sinszm.common.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 字符串驼峰命名相互转换
 *
 * @author chenjianbo
 */
public final class CamelAndUnderLineConverter {

    private static Pattern linePattern = Pattern.compile("_(\\w)");

    private static Pattern humpPattern = Pattern.compile("[A-Z]");

    /**
     * 下划线转驼峰
     * @param str   参数
     * @return      驼峰字符串
     */
    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,效率较高
     * @param str   参数
     * @return      下线字符串
     */
    public static String humpToLine(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();
    }

    /**
     * 驼峰转下划线(简单写法，效率低于{@link #humpToLine(String)})
     * @param str   参数
     * @return      下线字符串
     */
    public static String humpToLine2(String str) {
        return str.replaceAll("[A-Z]", "_$0").toLowerCase();
    }

}