【Java】JAVA日期安全格式化之SimpleDateFormat和jodaTime,DateTimeFormatter

Z时代
2024-01-10
分类：技术分享

`SimpleDateFormat`线程不安全的日期格式化库

package com.rumenz.task;
import java.text.SimpleDateFormat;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
//线程不安全
public class DataFormat {
private static SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyyMMdd");
private static Integer clientTotal=5000;
private static Integer threadTotal=200;
public static void main(String[] args) throws Exception{
ExecutorService executorService = Executors.newCachedThreadPool();
final Semaphore semaphore=new Semaphore(threadTotal);
final CountDownLatch countDownLatch=new CountDownLatch(clientTotal);
for (int i = 0; i <clientTotal ; i++) {
executorService.execute(()->{
try{
semaphore.acquire();
update();
semaphore.release();
}catch (Exception e){
e.printStackTrace();
}
countDownLatch.countDown();
});
}
countDownLatch.await();
executorService.shutdown();
}
private static void update() {
try{
simpleDateFormat.parse("20200115");
}catch (Exception e){
e.printStackTrace();
}
}
}

java.lang.NumberFormatException: For input string: "E152"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at java.text.DigitList.getDouble(DigitList.java:169)
at java.text.DecimalFormat.parse(DecimalFormat.java:2089)
at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1867)
at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1514)
at java.text.DateFormat.parse(DateFormat.java:364)
at com.rumenz.task.DataFormat.update(DataFormat.java:47)
at com.rumenz.task.DataFormat.lambda$main$0(DataFormat.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

`jodaTime` 线程安全的格式化库

引入依赖

<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.9.9</version></dependency>

package com.keytech.task;
import org.joda.time.DateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAccessor;
import java.util.Date;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
//线程安全
public class DataFormat1 {
public static Integer clientTotal=5000;
public static Integer threadTotal=200;
private static DateTimeFormatter dateTimeFormatter=DateTimeFormatter.ofPattern("yyyyMMdd");
public static void main(String[] args)  throws Exception{
ExecutorService executorService = Executors.newCachedThreadPool();
final Semaphore semaphore=new Semaphore(threadTotal);
final CountDownLatch countDownLatch=new CountDownLatch(clientTotal);
for (int i = 0; i < clientTotal; i++) {
executorService.execute(()->{
try{
semaphore.acquire();
update();
semaphore.release();
}catch (Exception e){
e.printStackTrace();
}
countDownLatch.countDown();
});
}
countDownLatch.await();
executorService.shutdown();
}
private static void update() {
DateTime dateTime = DateTime.parse("20200115").toDateTime();
System.out.println(dateTime);
}
}

`DateTimeFormatter` JAVA8中线程安全的日期转换类

package com.keytech.task;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
//线程安全
public class DateFormat2 {
public static Integer clientTotal=5000;
public static Integer threadTotal=200;
private  static final  DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
public static void main(String[] args) throws Exception{
ExecutorService executorService = Executors.newCachedThreadPool();
final Semaphore semaphore=new Semaphore(threadTotal);
final CountDownLatch countDownLatch=new CountDownLatch(clientTotal);
for (int i = 0; i < clientTotal; i++) {
try{
semaphore.acquire();
update();
semaphore.release();
}catch (Exception e){
e.printStackTrace();
}
countDownLatch.countDown();
}
countDownLatch.await();
executorService.shutdown();
}
private static void update() {
LocalDate localDate = LocalDate.parse("20200115", formatter);
System.out.println(localDate);
}
}