Now = * 2006/03/12 13:38:00, date = 2006/03/12 15:50:00 will output "in 1 hour, 12 minutes". * * @param tp text provider * @param date the date * @return the date nicely */ public String formatTime(TextProvider tp, java.util.Date date) { java.util.Date now = new java.util.Date(); StringBuilder sb = new StringBuilder(); List args = new ArrayList(); long secs = Math.abs((now.getTime() - date.getTime()) / 1000); long mins = secs / 60; long sec = secs % 60; int min = (int) mins % 60; long hours = mins / 60; int hour = (int) hours % 24; int days = (int) hours / 24; int day = days % 365; int years = days / 365; if (years > 0) { args.add(Long.valueOf(years)); args.add(Long.valueOf(day)); args.add(sb); args.add(null); sb.append(tp.getText(DATETAG_PROPERTY_YEARS, DATETAG_DEFAULT_YEARS, args)); } else if (day > 0) { args.add(Long.valueOf(day)); args.add(Long.valueOf(hour)); args.add(sb); args.add(null); sb.append(tp.getText(DATETAG_PROPERTY_DAYS, DATETAG_DEFAULT_DAYS, args)); } else if (hour > 0) { args.add(Long.valueOf(hour)); args.add(Long.valueOf(min)); args.add(sb); args.add(null); sb.append(tp.getText(DATETAG_PROPERTY_HOURS, DATETAG_DEFAULT_HOURS, args)); } else if (min > 0) { args.add(Long.valueOf(min)); args.add(Long.valueOf(sec)); args.add(sb); args.add(null); sb.append(tp.getText(DATETAG_PROPERTY_MINUTES, DATETAG_DEFAULT_MINUTES, args)); } else { args.add(Long.valueOf(sec)); args.add(sb); args.add(null); sb.append(tp.getText(DATETAG_PROPERTY_SECONDS, DATETAG_DEFAULT_SECONDS, args)); } args.clear(); args.add(sb.toString()); if (date.before(now)) { // looks like this date is passed return tp.getText(DATETAG_PROPERTY_PAST, DATETAG_DEFAULT_PAST, args); } else { return tp.getText(DATETAG_PROPERTY_FUTURE, DATETAG_DEFAULT_FUTURE, args); } } public boolean end(Writer writer, String body) { String msg = null; java.util.Date date = null; // find the name on the valueStack try { //suport Calendar also Object dateObject = findValue(name); if (dateObject instanceof java.util.Date) date = (java.util.Date) dateObject; else if(dateObject instanceof Calendar) date = ((Calendar) dateObject).getTime(); } catch (Exception e) { LOG.error("Could not convert object with key '" + name + "' to a java.util.Date instance"); // bad date, return a blank instead ? msg = ""; } //try to find the format on the stack if (format != null) { format = findString(format); } if (date != null) { TextProvider tp = findProviderInStack(); if (tp != null) { if (nice) { msg = formatTime(tp, date); } else { TimeZone tz = getTimeZone(); if (format == null) { String globalFormat = null; // if the format is not specified, fall back using the // defined property DATETAG_PROPERTY globalFormat = tp.getText(DATETAG_PROPERTY); // if tp.getText can not find the property then the // returned string is the same as input = // DATETAG_PROPERTY if (globalFormat != null && !DATETAG_PROPERTY.equals(globalFormat)) { SimpleDateFormat sdf = new SimpleDateFormat(globalFormat, ActionContext.getContext().getLocale()); sdf.setTimeZone(tz); msg = sdf.format(date); } else { DateFormat df = DateFormat.getDateTimeInstance( DateFormat.MEDIUM, DateFormat.MEDIUM, ActionContext.getContext().getLocale()); df.setTimeZone(tz); msg = df.format(date); } } else { SimpleDateFormat sdf = new SimpleDateFormat(format, ActionContext .getContext().getLocale()); sdf.setTimeZone(tz); msg = sdf.format(date); } } if (msg != null) { try { if (getVar() == null) { writer.write(msg); } else { putInContext(msg); } } catch (IOException e) { LOG.error("Could not write out Date tag", e); } } } } return super.end(writer, ""); } private TimeZone getTimeZone() { TimeZone tz = TimeZone.getDefault(); if (timezone != null) { timezone = stripExpressionIfAltSyntax(timezone); String actualTimezone = (String) getStack().findValue(timezone, String.class); if (actualTimezone != null) { timezone = actualTimezone; } tz = TimeZone.getTimeZone(timezone); } return tz; } @StrutsTagAttribute(description="Date or DateTime format pattern", rtexprvalue=false) public void setFormat(String format) { this.format = format; } @StrutsTagAttribute(description="Whether to print out the date nicely", type="Boolean", defaultValue="false") public void setNice(boolean nice) { this.nice = nice; } /** * @return Returns the name. */ public String getName() { return name; } @StrutsTagAttribute(description="The date value to format", required=true) public void setName(String name) { this.name = name; } /** * @return Returns the format. */ public String getFormat() { return format; } /** * @return Returns the nice. */ public boolean isNice() { return nice; } /** * @return Returns the name. */ public String getTimezone() { return timezone; } @StrutsTagAttribute(description = "The specific timezone in which to format the date", required = false) public void setTimezone(String timezone) { this.timezone = timezone; } }
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Struts example source code file (Date.java)
The Struts Date.java source code/* * $Id: Date.java 929448 2010-03-31 09:53:00Z lukaszlenart $ * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.apache.struts2.components; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.TextProvider; import com.opensymphony.xwork2.util.ValueStack; import com.opensymphony.xwork2.util.logging.Logger; import com.opensymphony.xwork2.util.logging.LoggerFactory; import org.apache.struts2.views.annotations.StrutsTag; import org.apache.struts2.views.annotations.StrutsTagAttribute; import java.io.IOException; import java.io.Writer; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Iterator; import java.util.List; import java.util.TimeZone; /** * <!-- START SNIPPET: javadoc --> * * Format Date object in different ways. * <p> * The date tag will allow you to format a Date in a quick and easy way. * You can specify a <b>custom format (eg. "dd/MM/yyyy hh:mm"), you can generate * <b>easy readable notations (like "in 2 hours, 14 minutes"), or you can just fall back * on a <b>predefined format with key 'struts.date.format' in your properties file. * * If that key is not defined, it will finally fall back to the default DateFormat.MEDIUM * formatting. * * <b>Note: If the requested Date object isn't found on the stack, a blank will be returned. * </p> * * Configurable attributes are :- * <ul> * <li>name * <li>nice * <li>format * </ul> * * <p/> * * Following how the date component will work, depending on the value of nice attribute * (which by default is false) and the format attribute. * * <p/> * * <b>Condition 1: With nice attribute as true * <table border="1"> * <tr> * <td>i18n key |
