Java多線程（三）SimpleDateFormat
阿新 • • 發佈：2017-09-25
spa bsp sdf java多線程 ext add println turn static
多線程報錯:java.lang.NumberFormatException: multiple points
SimpleDateFormat是非線程安全的，在多線程情況下會有問題，在每個線程下得各自new SimpleDateFormat()就可以了
實現有兩種方法：
1.
public class DateTools { public static Date parse(String formatPattern,String dateString) throws ParseException{ return new SimpleDateFormat(formatPattern).parse(dateString); }public static String format(String formatPattern,Date date){ System.out.println("format"); return new SimpleDateFormat(formatPattern).format(date); } }
2. ThreadLocal 每個線程都有自己的私有數據
package threadDemo.date; import java.text.SimpleDateFormat; public class DateTools {private static ThreadLocal<SimpleDateFormat> threadLocals = new ThreadLocal<SimpleDateFormat>(); public static SimpleDateFormat getSimpleDateFormat(String datePattern){ SimpleDateFormat sdf = null; sdf = threadLocals.get(); if(sdf ==null){ sdf= new SimpleDateFormat(datePattern); threadLocals.set(sdf); } return sdf; } }
Java多線程（三）SimpleDateFormat