java8中，java.util.Date, java.sql.Date, java.time.LocalDate 的转换异常及处理

java8中，java.util.Date, java.sql.Date, java.time.LocalDate 的转换异常及处理

/**
 *PreparedStatement绑定日期参数的时候，如果传入的是 java.util.Date,则会抛出如下异常
*  Caused by: java.lang.ClassCastException: java.util.Date cannot be cast to java.sql.Date
*/
ps.setDate(2, (java.sql.Date) startDate);//抛异常
ps.setDate(2, new java.sql.Date(startDate.getTime()));//正确方法

/**
 *利用如下方式将Date类型转换为 java.time.LocalDate 类型时，如果Date类型为 java.sql.Date,则会抛出如下异常
 *  Caused by: java.lang.UnsupportedOperationException
 *      at java.sql.Date.toInstant(Unknown Source) ~[?:1.8.0_172]
 *将java.sql.Date 转换成 java.util.Date后，如下方法正常转换
 */
LocalDate localSuspendDate = suspendDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();

// 完整代码如下
public Set<String> getSuspendDate(String stockId, Date startDate, Date endDate, String userId) {
    Connection connection = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    Set<String> suspendDates = new HashSet<>();
    try {
        logger.info(String.format("[SuspendDate][ %s ]开始请求停复盘信息 ...", userId));
        connection = dataSource.getConnection();
        ps = connection.prepareStatement(
                "select x.stock_id, x.suspend_date, x.resumption_date, x.suspend_reason from stock_suspend_info x where stock_id = ? and x.suspend_date >= ? and x.suspend_date <= ? order by suspend_date");
        ps.setString(1, stockId);
        // java.util.Date -> java.sql.Date
        ps.setDate(2, new java.sql.Date(startDate.getTime()));
        ps.setDate(3, new java.sql.Date(endDate.getTime()));
        rs = ps.executeQuery();
        while (rs.next()) {
            // java.sql.Date -> java.util.Date
            Date suspendDate = new java.util.Date(rs.getDate(2).getTime());
            Date resumptionDate = new java.util.Date(rs.getDate(3).getTime());
            String suspendReason = rs.getString(4);
            if (suspendDate == null || resumptionDate == null) {
                continue;
            }
            logger.info(String.format("[SuspendDate][ %s ][ %s ]在区间[ %s ]-[ %s ]内有停复盘信息，停盘原因 [ %s ]...", userId,
                    stockId, DateUtils.format(suspendDate, "yyyy-MM-dd"),
                    DateUtils.format(resumptionDate, "yyyy-MM-dd"), suspendReason));
            if (suspendDate.before(resumptionDate)) {
                // java.util.Date -> java.time.LocalDate
                LocalDate localSuspendDate = suspendDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
                LocalDate localResumptionDate = resumptionDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
                suspendDates.add(localSuspendDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
                while (localSuspendDate.isBefore(localResumptionDate)) {
                    localSuspendDate = localSuspendDate.plusDays(1);
                    suspendDates.add(localSuspendDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
                }
            }
        }
    } catch (Exception e) {
        throw new XException(XErrorCode.DB_EXCEPTION, e);
    } finally {
        if (rs != null)
            try {
                rs.close();
            } catch (SQLException e) {
                logger.error(e.getMessage(), e);
            }
        if (ps != null)
            try {
                ps.close();
            } catch (SQLException e) {
                logger.error(e.getMessage(), e);
            }

        if (connection != null)
            try {
                connection.close();
            } catch (SQLException e) {
                logger.error(e.getMessage(), e);
            }
    }

    return suspendDates;
}