精通struts2pdf:《精通Struts2 Web2.0 开发实战》笔记(1)

在第五章中，日期和时间的各必须输入正确才能运行正常。其格式应当与Locale有关。

我在默认的Locale（zh_cn）下，日期的格式为：xxxx-xx-xx

时间的输入，由于进行了验证，所以在TimeUtil类里我设置了Locale为US。US下的时间格式为：hh:mm:ss am/pm，其中hh的值为0-12。zh_cn下的格式：下午3:00。

为了方便用户输入0-24的数字，并且am/pm作为可选输入，我修改了TimeUtil类，修改后的代码如下：

 package com.fdar.apress.s2.app.util; import java.text.DateFormat; import java.util.Calendar; import java.util.Date; import java.util.Locale; import java.util.TimeZone; public class TimeUtil { private static final int INVALID = -1; private boolean valid = false; private int hour = 0; private int minute = 0; private int amOrPm = 0; public TimeUtil(String time){ parseTime(time); } public int getHour() { return hour; } public int getMinute() { return minute; } public int getHourAmPm() { return hour % 12; } public int getAmOrPm() { return amOrPm; } public boolean isValid(){ return this.valid; } protected void parseTime(String time, Locale locale){ if(time != null){ final String lowerCaseTime = time.toLowerCase(); int ampmIndex = lowerCaseTime.indexOf("am"); if(ampmIndex == INVALID){ ampmIndex = lowerCaseTime.indexOf("pm"); } int timeEnd = lowerCaseTime.indexOf(' '); if(timeEnd == INVALID){ timeEnd = ampmIndex==INVALID ? time.length() : ampmIndex; } int hourEnd = lowerCaseTime.indexOf(':'); if(hourEnd == INVALID){ hourEnd = timeEnd; } int hour = Integer.parseInt(time.substring(0, hourEnd)); int formatHour = hour % 12; this.amOrPm = (hour/12 == 1)? 1: 0; StringBuffer timeBuffer = new StringBuffer(String.valueOf(formatHour)); if(lowerCaseTime.indexOf(':') == INVALID){ timeBuffer.append(":00"); } else{ timeBuffer.append(time.substring(hourEnd+1, timeEnd)); } if(ampmIndex != INVALID){ timeBuffer.append(' '); timeBuffer.append(time.substring(ampmIndex)); } else{ if(this.amOrPm == Calendar.PM){ timeBuffer.append(" pm"); } else{ timeBuffer.append(" am"); } } try{ DateFormat df = DateFormat.getTimeInstance(DateFormat.SHORT, locale); df.setLenient(false); Date parsed = df.parse(timeBuffer.toString()); Calendar cal = Calendar.getInstance(); cal.setTime(parsed); this.amOrPm = cal.get(Calendar.AM_PM); this.hour = cal.get(Calendar.HOUR_OF_DAY); this.minute = cal.get(Calendar.MINUTE); this.valid = true; } catch(Exception e){ } } } protected void parseTime(String time) { parseTime(time, Locale.US); } protected Date resolveDate(Date date, int offset, int hour, int minute){ if(date == null) return null; Calendar cal = Calendar.getInstance(); StringBuffer sb = new StringBuffer("GMT"); if(offset >= 0){ sb.append('+'); } sb.append(offset); cal.setTimeZone(TimeZone.getTimeZone(sb.toString())); cal.setTime(date); cal.set(Calendar.HOUR_OF_DAY, hour); cal.set(Calendar.MINUTE, minute); return cal.getTime(); } public Date resolveDate(Date date, int offset){ return resolveDate(date, offset, this.hour, this.minute); } }

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