Java多线程（三）SimpleDateFormat

多线程报错:java.lang.NumberFormatException: multiple points

SimpleDateFormat是非线程安全的，在多线程情况下会有问题，在每个线程下得各自new SimpleDateFormat()就可以了

实现有两种方法：

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 每个线程都有自己的私有数据

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;

    }

}

巴特西

Java多线程（三）SimpleDateFormat

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