公司服务器一直报

java.lang.NumberFormatException: multiple points

at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1890)

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:2056)

at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1869)

at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1514)

at java.text.DateFormat.parse(DateFormat.java:364)

at cn.xjwlfw.yeshenghuo.system.util.DateUtil.parseDate(DateUtil.java:39)

或者



java.lang.NumberFormatException: For input string: ""

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Long.parseLong(Long.java:601)

at java.lang.Long.parseLong(Long.java:631)

at java.text.DigitList.getLong(DigitList.java:195)

at java.text.DecimalFormat.parse(DecimalFormat.java:2051)

at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:2162)

at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1514)

at java.text.DateFormat.parse(DateFormat.java:364)

at cn.xjwlfw.yeshenghuo.system.util.DateUtil.parseDate(DateUtil.java:39)

等等错误，

之前一直以为数据转换异常，后来查到多线程下SimpleDateFormat 是不安全的

之前的工具类

private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat();

/**

* 获取当前时间

* 

* @return 当前时间格式化后的字符串 示例: "2000-10-0 18:00:00"

*/

public static String getCurrentTime() { return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()); }

/**

* 获取当前格式化时间

* 

* @param pattern - 时间格式 示例: "yyyy-MM-dd HH:mm:ss"

* @return 当前时间格式化后的字符串 示例: "2000-10-0 18:00:00"

*/

public static String getCurrentTime(String pattern) { return new SimpleDateFormat(pattern).format(new Date()); }

public static String formatDate(String pattern, Date date) {

simpleDateFormat.applyPattern(pattern);

return simpleDateFormat.format(date);

}

public static Date parseDate(String pattern, String dateStr) throws ParseException {

simpleDateFormat.applyPattern(pattern);

return simpleDateFormat.parse(dateStr);

}

多线程环境下测试

测试代码

 final String patten1 = "yyyy-MM-dd";

        final String patten2 = "yyyy-MM";



     

        Thread t1 = new Thread() {



            @Override

            public void run() {

                try {

                for(int i=0;i<20000;i++){

                System.out.println("线程1："+i);

                DateUtil.simpleDateparseDate( patten1,"1992-09-13");

               

                }

                } catch (Exception e) {

                    e.printStackTrace();

                } 

            }

        };



        Thread t2 = new Thread() {



            @Override

            public void run() {

                try {

                for(int i=0;i<200000;i++){

                System.out.println("线程2："+i);

                DateUtil.simpleDateparseDate( patten1,"1992-09-13");

               

                }

                } catch (Exception e) {

                    e.printStackTrace();

                } 

            }

        };

        t1.start();

        t2.start();



修改后的工具类

//private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat();

private static ThreadLocal<SimpleDateFormat> local = new ThreadLocal<SimpleDateFormat>();  

/**

* 获取当前时间

* 

* @return 当前时间格式化后的字符串 示例: "2000-10-0 18:00:00"

*/

public static String getCurrentTime() { 

return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());

}

/**

* 获取当前格式化时间

* 

* @param pattern - 时间格式 示例: "yyyy-MM-dd HH:mm:ss"

* @return 当前时间格式化后的字符串 示例: "2000-10-0 18:00:00"

* 

* 解决方案1

* 

*/

public static String getCurrentTime(String pattern) { 

return new SimpleDateFormat(pattern).format(new Date());

}

public static String simpleDateformatDate(String pattern, Date date) {



return new SimpleDateFormat(pattern).format(date);

}

/**

* 

* 

* 

* 解决方案2

* 

*/

public static Date simpleDateparseDate(String pattern, String dateStr) throws ParseException {

return new SimpleDateFormat(pattern).parse(dateStr);

}



  public static Date parseDate(String pattern,String str) throws ParseException {  

        SimpleDateFormat sdf = local.get();  

        if (sdf == null) {  

            sdf = new SimpleDateFormat(pattern, Locale.US);  

            local.set(sdf);  

        }  

        try {

return sdf.parse(str);

} catch (ParseException e) {

e.printStackTrace();

}

return new SimpleDateFormat(pattern).parse(str);  

    }  

  public static String formatDate(String pattern,Date date){  

        SimpleDateFormat sdf = local.get();  

        if (sdf == null) {  

            sdf = new SimpleDateFormat(pattern, Locale.US);  

            local.set(sdf);  

        }  

        return sdf.format(date);  

    }  



附上几篇博客

https://www.cnblogs.com/zemliu/archive/2013/08/29/3290585.html

http://blog.csdn.net/zdp072/article/details/41044059