java8和ThreadLocal解决时间格式的线程安全问题

╰半夏微凉° 2024-04-19 06:29 62阅读 0赞

一、传统时间，日期，日期格式是变化的，多线程访问下都是线程不安全的，解决此不安全问题实例如下  
 public class DateFormateThreadLocal \{  
   private static final ThreadLocal< DateFormat> df = new ThreadLocal()\{  
   @Override  
   protected DateFormat initialValue() \{  
      return new SimpleDateFormat(“yyyy-MM-dd”);  
     \}  
   \};  
   public static Date convert(String date) throws ParseException \{  
       return df.get().parse(date);  
     \}  
 \}  
、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、  
public class TestDateFormateThreadLocal \{  
   @Test  
   public void test1() throws Exception\{  
      Callable< Date> task = new Callable() \{  
         @Override  
         public Date call() throws Exception \{  
            return DateFormateThreadLocal.convert(“2019-12-15”);  
           \}  
     \};  
   ExecutorService pool = Executors.newFixedThreadPool(10);  
   List<Future< Date >> results = Lists.newArrayList();  
   for(int i = 0;i < 10;i++)\{  
      results.add(pool.submit(task));  
     \}  
   for (Future result : results) \{  
      System.out.println(result.get().toLocaleString());  
    \}  
   pool.shutdown();  
   \}  
\}  
     
/**华丽分割线 java8**\*\*\*\*/

public class TestDateFormateThreadLocal { 
    
        
        @Test
        public  void  test2() throws Exception{ 
           // DateTimeFormatter dtf = DateTimeFormatter.ISO_LOCAL_DATE;
            DateTimeFormatter dtf =  DateTimeFormatter.ofPattern("yyyy-MM-dd");
            Callable<LocalDate> task = new Callable<LocalDate>() { 
                @Override
                public LocalDate call() throws Exception { 
                    return LocalDate.parse("2019-12-15",dtf);
                }
            };
            ExecutorService pool = Executors.newFixedThreadPool(10);
            List<Future<LocalDate>> results = Lists.newArrayList();
            for(int i = 0;i < 10;i++){ 
                results.add(pool.submit(task));
            }
    
            for (Future<LocalDate> result : results) { 
                System.out.println(result.get().toString());
            }
            pool.shutdown();
        }