package threadlocal;import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;/*** 描述： 利用ThreadLocal，給每個線程分配自己的dateFormat對象，保證了線程安全，高效利用內存*/ public class ThreadLocalNormalUsage05 {public static ExecutorService threadPool = Executors.newFixedThreadPool(10);public static void main(String[] args) throws InterruptedException {for (int i = 0; i < 1000; i++) {int finalI = i;threadPool.submit(new Runnable() {@Overridepublic void run() {String date = new ThreadLocalNormalUsage05().date(finalI);System.out.println(date);}});}threadPool.shutdown();}public String date(int seconds) {//參數的單位是毫秒，從1970.1.1 00:00:00 GMT計時Date date = new Date(1000 * seconds); // SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");SimpleDateFormat dateFormat = ThreadSafeFormatter.dateFormatThreadLocal2.get();return dateFormat.format(date);} }class ThreadSafeFormatter {public static ThreadLocal<SimpleDateFormat> dateFormatThreadLocal = new ThreadLocal<SimpleDateFormat>() {@Overrideprotected SimpleDateFormat initialValue() {return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");}};public static ThreadLocal<SimpleDateFormat> dateFormatThreadLocal2 = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); }

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