Java:无法解析的日期异常 [英] Java: unparseable date exception

问题描述

在尝试转换日期格式时，我收到一个异常:无法解析的日期并且不知道如何解决这个问题.

While trying to transform the date format I get an exception:unparseable date and don't know how to fix this problem.

我收到一个表示事件日期的字符串，并希望在 GUI 中以不同的格式显示该日期.

I am receiving a string which represents an event date and would like to display this date in different format in GUI.

我试图做的是以下内容:

What I was trying to do is the following:

private String modifyDateLayout(String inputDate){
        try {
            //inputDate = "2010-01-04 01:32:27 UTC";
            Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").parse(inputDate);
            return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return "15.01.2010";
        }
    }

反正行

String modifiedDateString = originalDate.toString();

是假的.我想获得以下格式的日期字符串:

is dummy. I would like to get a date string in the following format:

dd.MM.yyyy HH:mm:ss

dd.MM.yyyy HH:mm:ss

输入字符串示例如下:

2010-01-04 01:32:27 UTC

2010-01-04 01:32:27 UTC

有谁知道如何将上面的示例日期(字符串)转换成字符串格式dd.MM.yyyy HH:mm:ss?

Does anyone know how to convert the example date (String) above into a String format dd.MM.yyyy HH:mm:ss?

谢谢！

我修正了错误的输入日期格式，但仍然无法正常工作.上面是粘贴的方法，下面是调试会话的屏幕图像.

I fixed the wrong input date format but still it doesn't work. Above is the pasted method and below is the screen image from debugging session.

替代文字 http://img683.imageshack.us/img683/193/dateproblem.png

#更新我跑了

String[] timezones = TimeZone.getAvailableIDs();

并且数组中有 UTC 字符串.这是一个奇怪的问题.

and there is UTC String in the array. It's a strange problem.

我做了一个有效的肮脏的黑客:

I did a dirty hack that works:

private String modifyDateLayout(String inputDate){
    try {
        inputDate = inputDate.replace(" UTC", "");
        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(inputDate);
        return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
    } catch (ParseException e) {
        e.printStackTrace();
        return "15.01.2010";
    }
}

但我仍然希望在不减少时区的情况下转换原始输入.

But still I would prefer to transform the original input without cutting timezone away.

此代码是为使用 JDK 1.6 的 Android 手机编写的.

This code is written for Android phone using JDK 1.6.

推荐答案

你在这里所做的基本上是依赖于 Date#toString() 已经有了固定的模式.要将 Java Date 对象转换为另一个人类可读的 String 模式，您需要 SimpleDateFormat#format().

What you're basically doing here is relying on Date#toString() which already has a fixed pattern. To convert a Java Date object into another human readable String pattern, you need SimpleDateFormat#format().

private String modifyDateLayout(String inputDate) throws ParseException{
    Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").parse(inputDate);
    return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
}

顺便说一句，无法解析的日期"异常在这里只能被SimpleDateFormat#parse().这意味着 inputDate 不在预期的模式 "yyyy-MM-dd HH:mm:ss z" 中.您可能需要修改模式以匹配 inputDate 的实际模式.

By the way, the "unparseable date" exception can here only be thrown by SimpleDateFormat#parse(). This means that the inputDate isn't in the expected pattern "yyyy-MM-dd HH:mm:ss z". You'll probably need to modify the pattern to match the inputDate's actual pattern.

更新:好的，我做了一个测试:

Update: Okay, I did a test:

public static void main(String[] args) throws Exception {
    String inputDate = "2010-01-04 01:32:27 UTC";
    String newDate = new Test().modifyDateLayout(inputDate);
    System.out.println(newDate);
}

这正确打印:

03.01.2010 21:32:27

(我在 GMT-4)

更新 2: 根据您的编辑，您确实得到了一个 ParseException.最可疑的部分将是 UTC 的时区.这在您的 Java 环境中实际上已知吗?您使用的是什么 Java 版本和什么操作系统版本?检查 TimeZone.getAvailableIDs().中间必须有 UTC.

Update 2: as per your edit, you really got a ParseException on that. The most suspicious part would then be the timezone of UTC. Is this actually known at your Java environment? What Java version and what OS version are you using? Check TimeZone.getAvailableIDs(). There must be a UTC in between.

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