java - DateTimeFormatter 中的 IllegalArgumentException

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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这个问题是由拼写错误或无法再重现的问题引起的。虽然类似的问题可能是 on-topic在这里，这个问题的解决方式不太可能帮助 future 的读者。

已关闭 8 年前。

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这是我的异常(exception):

java.lang.IllegalArgumentException: Invalid format: "2014-09-16" is malformed at "-09-16"
   at org.joda.time.format.DateTimeFormatter.parseDateTime(DateTimeFormatter.java:866)
   at Project.BorrowedModel.getDateDifference(BorrowedModel.java:216)
   at Project.BorrowedModel.UserHasLatedReturn(BorrowedModel.java:195)
   ...

这是我的方法:

(此代码用于检测我们图书馆的用户是否有 10 天内未归还的图书)。

public boolean UserHasLatedReturn(int userID) throws NullPointerException {
    String todayDate = getTodayDate();
    String userBorrowDate = getUserBorrowDate(userID);
    if (userBorrowDate == null) {
        return false;
    }
    int difference = getDateDifference(userBorrowDate, todayDate);
    if (difference > 10) { // More that 10 days
        System.out.println("You have " + difference + " Days Delay in returning your previouse book");
        return true;
    }
    return false;
}

public int getDateDifference(String firstDate, String secondDate) {

    DateTime d1, d2, dt1 = null, dt2 = null;
    DateTimeFormatter format = DateTimeFormat.forPattern("YYYY/MM/dd");

    try {
        d1 = format.parseDateTime(firstDate);  // Exception is here
        d2 = format.parseDateTime(secondDate);

        dt1 = new DateTime(d1);
        dt2 = new DateTime(d2);

    } catch (Exception e) {
        e.printStackTrace();
    }
    return Days.daysBetween(dt1, dt2).getDays();
}

public String getTodayDate() {
    Calendar todayDate = Calendar.getInstance();
    SimpleDateFormat simpleFormat = new SimpleDateFormat("YYYY/MM/dd");
    String strDate = simpleFormat.format(todayDate.getTime());
    return strDate;
}

public String getUserBorrowDate(int userID) {
    String query = "SELECT Borrow_Date FROM Borrowed WHERE User_ID=?";
    String date = null;
    try (Connection con = DriverManager.getConnection(dbUrl, "root", "2323");
            PreparedStatement ps = con.prepareStatement(query);) {
        ps.setInt(1, userID);
        ResultSet rs = ps.executeQuery();
        while (rs.next()) {
            date = rs.getString("Borrow_Date");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return date;
}

这段代码之前可以正常工作，但现在不行!

我的代码有什么问题吗？

Answer 1

正如其他人所指出的，您从 getUserBorrowDate() 获取格式错误的日期字符串，并将其最终传递给 getDateDifference() ，这会引发异常。我只需使用 ResultSet.getDate() 并比较日期，而不是进行所有字符串解析。

public boolean UserHasLatedReturn(int userID) throws NullPointerException {
    LocalDate todayDate = new LocalDate();
    LocalDate userBorrowDate = getUserBorrowDate(userID);
    if (userBorrowDate == null) {
        return false;
    }
    int difference = Days.daysBetween(userBorrowDate, todayDate).getDays();
    if (difference > 10) { // More than 10 days
        System.out.println("You have " + difference + " Days Delay in returning your previous book");
        return true;
    }
    return false;
}
public LocalDate getUserBorrowDate(int userID) {
    String query = "SELECT Borrow_Date FROM Borrowed WHERE User_ID=?";
    LocalDate date = null;
    try (Connection con = DriverManager.getConnection(dbUrl, "root", "2323");
            PreparedStatement ps = con.prepareStatement(query);) {
        ps.setInt(1, userID);
        ResultSet rs = ps.executeQuery();
        while (rs.next()) {
            date = LocalDate.fromDateFields(rs.getDate("Borrow_Date"));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return date;
}