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org.apache.turbine.util.HttpUtils |
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1 | package org.apache.turbine.util; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import java.text.SimpleDateFormat; |
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20 | ||
21 | import java.util.Date; |
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22 | import java.util.Locale; |
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23 | import java.util.TimeZone; |
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24 | ||
25 | /** |
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26 | * This class provides utilities for handling some semi-trivial HTTP stuff that |
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27 | * would othterwise be handled elsewhere. |
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28 | * |
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29 | * @author <a href="mailto:magnus@handpoint.com">Magnús Þór Torfason</a> |
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30 | * @version $Id: HttpUtils.java 278958 2005-09-06 09:35:39Z henning $ |
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31 | */ |
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32 | 0 | public class HttpUtils |
33 | { |
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34 | /** |
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35 | * The date format to use for HTTP Dates. |
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36 | */ |
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37 | private static SimpleDateFormat httpDateFormat; |
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38 | ||
39 | static |
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40 | { |
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41 | 0 | httpDateFormat = new SimpleDateFormat( |
42 | "EEE, dd MMM yyyy HH:mm:ss z", Locale.US); |
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43 | 0 | httpDateFormat.setTimeZone(TimeZone.getTimeZone("GMT")); |
44 | 0 | } |
45 | ||
46 | /** |
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47 | * Formats a java Date according to rfc 1123, the rfc standard for dates in |
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48 | * http. |
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49 | * |
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50 | * @param date The Date to format |
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51 | * @return A String represeentation of the date |
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52 | */ |
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53 | public static String formatHttpDate(Date date) |
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54 | { |
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55 | 0 | synchronized (httpDateFormat) |
56 | { |
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57 | 0 | return httpDateFormat.format(date); |
58 | 0 | } |
59 | } |
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60 | ||
61 | /** |
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62 | * This method sets the required expiration headers in the response for a |
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63 | * given RunData object. This method attempts to set all relevant headers, |
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64 | * both for HTTP 1.0 and HTTP 1.1. |
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65 | * |
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66 | * @param data The RunData object we are setting cache information for. |
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67 | * @param expiry The number of seconds untill the document should expire, |
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68 | * <code>0</code> indicating immediate expiration (i.e. no caching). |
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69 | */ |
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70 | public static void setCacheHeaders(RunData data, int expiry) |
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71 | { |
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72 | 0 | if (0 == expiry) |
73 | { |
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74 | 0 | data.getResponse().setHeader("Pragma", "no-cache"); |
75 | 0 | data.getResponse().setHeader("Cache-Control", "no-cache"); |
76 | 0 | data.getResponse().setHeader("Expires", |
77 | formatHttpDate(new Date())); |
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78 | } |
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79 | else |
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80 | { |
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81 | 0 | Date expiryDate = new Date(System.currentTimeMillis() + expiry); |
82 | 0 | data.getResponse().setHeader("Expires", |
83 | formatHttpDate(expiryDate)); |
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84 | } |
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85 | 0 | } |
86 | ||
87 | } |
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