Java 把map的key转换成驼峰命名

• Z时代
• 2024-01-10
• 分类：综合

需求：将map里的key转换为驼峰命名，并返回

package com.enation.app.javashop.framework.util;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
/**
 * map工具类
 *
 * @author 
 * @date 2021/8/31 12:57
 */
public class MapUtils {
    /**
     * 把map的key转换成驼峰命名
     *
     * @param map
     * @return map
     */
    public static Map<String, Object> toReplaceKeyLow(Map<String, Object> map) {
        Map<String, Object> reMap = new HashMap<>();
        if (reMap != null) {
            Iterator var2 = map.entrySet().iterator();
            while (var2.hasNext()) {
                Entry<String, Object> entry = (Entry) var2.next();
                reMap.put(underlineToCamel((String) entry.getKey()), map.get(entry.getKey()));
            }
            map.clear();
        }
        return reMap;
    }
    public static final char UNDERLINE = '_';
    public static String underlineToCamel(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c == UNDERLINE) {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(Character.toLowerCase(param.charAt(i)));
            }
        }
        return sb.toString();
    }
}

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