java执行 string code

import com.ishansong.bigdata.common.util.DateUtils;
import org.apache.commons.jexl3.JexlBuilder;
import org.apache.commons.jexl3.JexlContext;
import org.apache.commons.jexl3.JexlEngine;
import org.apache.commons.jexl3.MapContext;
import org.junit.jupiter.api.Test;

import java.util.HashMap;

/**
 * @author shengjk1
 * @date 2020/6/30
 */
public class jcTest {
	@Test
	void getImpalaUrl() {
		JexlEngine jexl;
		JexlContext jc;
		
		jexl = new JexlBuilder().create();
		jc = new MapContext();
		long l = System.currentTimeMillis();
		for (int i = 0; i < 10000; i++) {
			HashMap<String, String> sourceMap = new HashMap<>();
			sourceMap.put("ctime", "20200321 12:23:22");
			jc.set("map", sourceMap);
			jc.set("dateUtils", DateUtils.class);
			String rangExpression = "dateUtils.dateStrFormatDay(map['ctime'], 'yyyyMMdd')";
			jexl.createExpression(rangExpression.trim()).evaluate(jc);
		}
		long l1 = System.currentTimeMillis();
		System.out.println((l1 - l) / 10000.0);
	}
}

import org.apache.commons.lang3.time.FastDateFormat;

import java.text.ParseException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Period;
import java.time.format.DateTimeFormatter;
import java.util.*;

/**
 * @author shengjk1
 */
public class DateUtils {
		
	/**
	 *
	 * @param dateStr
	 * @param format
	 * @return
	 * @throws ParseException
	 */
	public static String dateStrFormatDay(String dateStr, String format) throws ParseException {
		FastDateFormat dateFormat = FastDateFormat.getInstance(format);
		Date parse = dateFormat.parse(dateStr);
		dateFormat=FastDateFormat.getInstance("yyyyMMdd");
		return dateFormat.format(parse);
	}
}