java map重写转大写、转驼峰

/**
 * @author admin
 * @Description
 * 转大写
 */
public class HashMapUpper<V> extends HashMap<String, V> {
    /**
     * 复写put方法，因为Mybatis底层给Map赋值就是调用的put方法
     *
     * @param key
     * @param value
     * @return
     */
    @Override
    public V put(String key, V value) {
        return super.put(key.toUpperCase(), value);
    }
 
    /**
     * 复写get方法
     *
     * @param key
     * @return
     */
    @Override
    public V get(Object key) {
        if (key instanceof String) {
            return super.get(((String) key).toUpperCase());
        } else {
            return super.get(key);
        }
    }
}

/**
 * @author admin
 * @Description 将下划线转为驼峰格式
 */
public class HashMapToCamel<V> extends HashMap<String, V> {
 
    public static final char UNDERLINE = '_';
 
    /**
     * 复写put方法，因为Mybatis底层给Map赋值就是调用的put方法
     *
     * @param key
     * @param value
     * @return
     */
    @Override
    public V put(String key, V value) {
        return super.put(underlineToCamel(key), value);
    }
 
    /**
     * 复写get方法
     *
     * @param key
     * @return
     */
    @Override
    public V get(Object key) {
        if (key instanceof String) {
            return super.get(underlineToCamel(key + ""));
        } else {
            return super.get(key);
        }
    }
 
 
    /**
     * 将下划线转为驼峰格式
     *
     * @param param
     * @return
     */
    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();
    }
 
}