java 中 Date 类型快判断日期是否合法.

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// 如果日期不合法，则抛异常try {String date_str = "5555-22-33";SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");format.setLenient(false);Date date = format.parse(date_str);} catch (Exception ex){ex.printStackTrace();System.out.println("日期不合法");}

JDK 中的注释说明：

/**     * Specify whether or not date/time parsing is to be lenient.  With     * lenient parsing, the parser may use heuristics to interpret inputs that     * do not precisely match this object's format.  With strict parsing,     * inputs must match this object's format.     *     * <p>This method is equivalent to the following call.     * <blockquote><pre>     *  getCalendar().setLenient(lenient)     * </pre></blockquote>     *     * <p>This leniency value is overwritten by a call to {@link     * #setCalendar(java.util.Calendar) setCalendar()}.     *     * @param lenient when {@code true}, parsing is lenient     * @see java.util.Calendar#setLenient(boolean)     */    public void setLenient(boolean lenient)    {        calendar.setLenient(lenient);    }

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