com.kukababy.plus.utils.StringUtil Maven / Gradle / Ivy

Go to download
/**
 * 
 */
package com.kukababy.plus.utils;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.alibaba.fastjson.JSON;

/**
 * 
 * 
 *  * 描述:
 * 
 * 
 * 
 * 
 * @author [email protected]
 * @date 2019年3月5日 下午10:48:56
 */
public class StringUtil {
	public static final char UNDERLINE_CHAR = '_';

	public static String getTableName(String className) {
		return className.substring(0, 1).toLowerCase() + className.substring(1);
	}

	/**
	 * 
	 * 
	 * 
	 * 	 * 描述:
	 * 驼峰转下划线
	 * 
	 * 
	 * 
	 * 
	 * @param camelStr
	 * @return
	 */
	public static String camel2Underline(String camelStr) {

		if (StringUtils.isEmpty(camelStr)) {
			return StringUtils.EMPTY;
		}

		int len = camelStr.length();
		StringBuilder strb = new StringBuilder(len + len >> 1);
		for (int i = 0; i < len; i++) {

			char c = camelStr.charAt(i);
			if (Character.isUpperCase(c)) {

				strb.append(UNDERLINE_CHAR);
				strb.append(Character.toLowerCase(c));
			} else {

				strb.append(c);
			}
		}
		return strb.toString();
	}

	/**
	 * 
	 * 
	 * 
	 * 	 * 描述:
	 * 下划线转驼峰
	 * 
	 * 
	 * 
	 * 
	 * @param underlineStr
	 * @return
	 */
	public static String underline2Camel(String underlineStr) {

		if (StringUtils.isEmpty(underlineStr)) {
			return StringUtils.EMPTY;
		}

		int len = underlineStr.length();
		StringBuilder strb = new StringBuilder(len);
		for (int i = 0; i < len; i++) {

			char c = underlineStr.charAt(i);
			if (c == UNDERLINE_CHAR && (++i) < len) {
				c = underlineStr.charAt(i);
				strb.append(Character.toUpperCase(c));
			} else {
				strb.append(c);
			}
		}
		return strb.toString();
	}

	public static String select2Lower(String sql) {
		// String sql = "seLect * from SelEct";
		return sql.replaceAll("[sS][eE][lL][eE][cC][tT]", "select");
	}

	public static String from2Lower(String sql) {
		return sql.replaceAll("[fF][rR][oO][mM]", "from");

	}

	/**
	 * 
	 * 
	 * 
	 * 	 * 描述:
	 * 构建sql语句的统计
	 * 
	 * 
	 * 
	 * 
	 * @param sql
	 * @return
	 */
	public static String getCountSql(String sql) {
		// sql = select2Lower(sql);
		sql = from2Lower(sql);
		int fromPos = sql.indexOf("from");
		String countSql = "select count(1) from " + sql.substring(fromPos + 4);
		return countSql;
	}

	public static Map humpConvert(Map rowMap) {
		Map resMap = new HashMap();
		for (Map.Entry entry : rowMap.entrySet()) {
			String key = entry.getKey();
			resMap.put(underline2Camel(key), entry.getValue());
		}
		return resMap;
	}

	public static void main(String args[]) {
		Map map = new HashMap();
		map.put("emp_id", "001");
		map.put("agE_Id", "001");
		map.put("addr_id", "001");
		map.put("addTT_d", "001");

		System.out.println(JSON.toJSONString(humpConvert(map)));
		// String sql = "select we,wwe,ee from where From and from";
		// System.out.println(getCountSql(sql));
	}

}