java - 操作日期的静态方法。多线程问题

Question

friend ，

我正在提供我的生产代码的修改后的摘录。

运行以下代码时，尽管我正在通过传递 auditdate1 执行 getDateEndOfDay，但我收到“TestDateProblem:getYear 方法问题”。

我无法真正解决这个问题，因为日期是正确的，我可以在我的生产代码的 catch block 中的记录器中看到它。我非常需要你的帮助。

此 getDateEndOfDay 方法从许多公共(public)方法调用，并且多个线程可能同时调用这些静态方法。

package test;

import java.util.Arrays;

import java.util.Date;

import java.util.GregorianCalendar;


public class TestDateProblem {

    public static void main(String args[]) {
        /*
         * This is the date format that is mostly used. Logger shows this kind
         * of date during Exception.
         */
        String auditdate1 = "2011-12-27";
        // Rarely sent this way.
        String auditdate2 = "27-12-2011";
        /*
         * We don't send this way but I'm sure the problem occurs if the date goes this
         * way. As far as the inputs are concerned, it doesn't go like this.
         */
        String auditdate3 = "27-2011-12";

        try {

            System.out.println("Result1:" + getDateEndOfDay(auditdate1));

            System.out.println("Result2:" + getDateEndOfDay(auditdate2));
            // simulating problem?
            System.out.println("Result3:" + getDateEndOfDay(auditdate3));
        } catch (Exception e) {
            System.out.println("auditdate1:" + auditdate1);
        }
    }

    /*
     * This getDateEndOfDay(.) method is called from many public methods and it
     * may be possible that multiple threads are calling these static methods at
     * the same time.
     */
    public static Date getDateEndOfDay(String dateparam) throws Exception {
        String separator = "/";
        dateparam = dateparam.replace("-", separator);
        String[] strP = dateparam.split(separator);
        Integer year = getYear(strP);
        Integer month = getMonth(strP);
        Integer day = getDay(strP);
        GregorianCalendar cal = new GregorianCalendar(year, month - 1, day, 23,
                59, 00);

        return cal.getTime();
    }

    private static Integer getYear(String[] dateComponents) throws Exception {
        if (dateComponents.length != 3) {
            return 1900;
        }
        System.out
                .println("dateComponents::" + Arrays.toString(dateComponents));

        Integer val1 = Integer
                .valueOf(dateComponents[0].startsWith("0") ? dateComponents[0]
                        .substring(1) : dateComponents[0]);
        Integer val2 = Integer
                .valueOf(dateComponents[2].startsWith("0") ? dateComponents[2]
                        .substring(1) : dateComponents[2]);
        if (val1 > 1900) {
            return val1;
        } else if (val2 > 1900) {
            return val2;
        } else {
            // Original code throws exception instead of printing to console.
            System.out.println("TestDateProblem: Problem with getYear method.");
            throw new Exception();
        }
    }

    private static Integer getDay(String[] dateComponents) {
        if (dateComponents.length != 3) {
            return -1;
        }

        Integer val1 = Integer
                .valueOf(dateComponents[0].startsWith("0") ? dateComponents[1]
                        .substring(1) : dateComponents[0]);
        Integer val2 = Integer
                .valueOf(dateComponents[2].startsWith("0") ? dateComponents[1]
                        .substring(1) : dateComponents[2]);

        if (val1 <= 31) {
            return val1;
        } else if (val2 <= 31) {
            return val2;
        } else {
            System.out.println("TestDateProblem: Problem with getDay method.");
            return 0;
        }
    }

    private static Integer getMonth(String[] dateComponents) {
        if (dateComponents.length != 3) {
            return 0;
        }

        Integer val1 = Integer
                .valueOf(dateComponents[1].startsWith("0") ? dateComponents[1]
                        .substring(1) : dateComponents[1]);

        if (val1 <= 12 && val1 >= 1) {
            return val1;
        } else {
            System.out
                    .println("TestDateProblem:: Problem with getMonth method");
            return 0;
        }
    }
}

Answer 1

虽然代码不必要地冗长，但也相当清晰。您遇到的问题是它试图确定日期是 yyyy/mm/dd 格式还是 dd/mm/yyyy 格式，但是如果您有时给它像 yy/mm/dd 格式，它无法计算出什么它是并给出了您看到的错误。

使用调试器单步执行代码将证实这一点。

我会再次阅读这条评论，因为它解释了问题

* We don't send this way but the problem occurs if the date goes this
* way.

你给它一个无效的格式化日期，它拒绝它是正确的，因为它不知道如何处理它。