SimpleDateFormat和FastDateFormat的效率测试，FastDateFormatr优于SimpleDateFormat

需要引入commons-lang包，Maven配置如下：

 

 <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>

 

 

测试代码如下：

importorg.apache.commons.lang3.time.FastDateFormat;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * Discribe:日期工具类
 * Date:  2016/5/13
 * Time: .19:05
 */
public class FastDateFormaTest {

    /*patten*/
public final static String PATTEN_YEAR = "yyyy" ;
    public final static String PATTEN_YEAR_MM = "yyyy-MM" ;
    public final static String PATTEN_YEAR_MM_DD = "yyyy-MM-dd" ;
    public final static String PATTEN_YEAR_MM_DD_HH = "yyyy-MM-dd HH" ;
    public final static String PATTEN_YEAR_MM_DD_HH_MM = "yyyy-MM-dd HH:mm" ;
    public final static String PATTEN_YEAR_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss" ;
    public final static String PATTEN_YEAR_MM_DD_HH_MM_SS_MS = "yyyy-MM-dd HH:mm:ss:ms" ;

    public static  void main(String[] args)  {
       /**
         * 测试10次
         */
        /*for(int i=1;i<=10;i++){
            testDateFormat(i);
        }*/
Date date = new Date();
        System.out.println(dateToString(date,PATTEN_YEAR));
        System.out.println(dateToString(date,PATTEN_YEAR_MM));
        System.out.println(dateToString(date,PATTEN_YEAR_MM_DD));
        System.out.println(dateToString(date,PATTEN_YEAR_MM_DD_HH));
        System.out.println(dateToString(date,PATTEN_YEAR_MM_DD_HH_MM));
        System.out.println(dateToString(date,PATTEN_YEAR_MM_DD_HH_MM_SS));
        System.out.println(dateToString(date,PATTEN_YEAR_MM_DD_HH_MM_SS_MS));
    }

    /**
     * 指定日期及需输出格式，返回格式化后的字符串
     * @param date
* @param patten
* @return
*/
public final static String dateToString(Date date,String patten) {
        FastDateFormat fastDateFormat = FastDateFormat.getInstance(patten);
        return fastDateFormat.format(date);
    }



    /**
     *  testDateFormat
     */
public static void testDateFormat(int num){
        System.out.println("执行第"+num+"次");
        int cont = 200000;

        long l1 = System.currentTimeMillis();
        for(int i=0;i<=cont;i++){
            SimpleDateFormat s = new SimpleDateFormat(PATTEN_YEAR_MM_DD_HH_MM_SS);
            Date date = new Date();
            String string = s.format(date);

        }
        long l2 =  System.currentTimeMillis();
        System.out.println("SimpleDateFormat covert time:"+(l2-l1));

        for(int i=0;i<=cont;i++){
            FastDateFormat s = FastDateFormat.getInstance(PATTEN_YEAR_MM_DD_HH_MM_SS);
            Date date = new Date();
            String string = s.format(date);
            //System.out.println(string);
}
        long l3 =  System.currentTimeMillis();
        System.out.println("FastDateFormat covert time:"+(l3-l2));

    }
}

 

多次运行结果如下：

 

执行第1次
SimpleDateFormat covert time:1183
FastDateFormat covert time:441
执行第2次
SimpleDateFormat covert time:566
FastDateFormat covert time:155
执行第3次
SimpleDateFormat covert time:322
FastDateFormat covert time:132
执行第4次
SimpleDateFormat covert time:323
FastDateFormat covert time:140
执行第5次
SimpleDateFormat covert time:331
FastDateFormat covert time:130
执行第6次
SimpleDateFormat covert time:292
FastDateFormat covert time:93
执行第7次
SimpleDateFormat covert time:245
FastDateFormat covert time:96
执行第8次
SimpleDateFormat covert time:249
FastDateFormat covert time:98
执行第9次
SimpleDateFormat covert time:246
FastDateFormat covert time:98
执行第10次
SimpleDateFormat covert time:242
FastDateFormat covert time:103

 从运行结果来看，FastDateFormat效率明 SimpleDateFormat