Mercurial > hg > digilib-old
annotate servlet/src/digilib/servlet/ServletOps.java @ 95:a82150544f4a
New version 1.8b4.
Uses new Collection classes.
| author | robcast |
|---|---|
| date | Mon, 17 Mar 2003 16:07:05 +0100 |
| parents | 3b8797fc3e90 |
| children | afe7ff98bb71 |
| rev | line source |
|---|---|
| 1 | 1 /* ServletOps -- Servlet utility class |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 5 Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de) | |
| 6 | |
| 7 This program is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Please read license.txt for the full details. A copy of the GPL | |
| 13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 package digilib.servlet; | |
| 22 | |
| 23 import javax.servlet.*; | |
| 24 import javax.servlet.http.*; | |
| 25 import java.io.*; | |
| 26 import java.util.*; | |
| 27 | |
| 28 import digilib.*; | |
| 29 import digilib.io.*; | |
| 30 | |
| 31 | |
| 32 public class ServletOps { | |
| 33 | |
| 34 private Utils util = null; | |
| 95 | 35 private HashMap confTable = null; |
| 1 | 36 |
| 37 public ServletOps() { | |
| 38 util = new Utils(); | |
| 39 } | |
| 40 | |
| 41 public ServletOps(Utils u) { | |
| 42 util = u; | |
| 43 } | |
| 44 | |
| 45 public ServletOps(Utils u, ServletConfig sc) throws ServletException { | |
| 46 util = u; | |
| 47 setConfig(sc); | |
| 48 } | |
| 49 | |
| 50 public void setUtils(Utils u) { | |
| 51 util = u; | |
| 52 } | |
| 53 | |
| 54 /** | |
| 55 * read parameter list from the XML file in init parameter "config-file" | |
| 56 */ | |
| 57 public void setConfig(ServletConfig c) throws ServletException { | |
| 58 // reset parameter table | |
| 59 confTable = null; | |
| 60 if (c == null) { | |
| 61 return; | |
| 62 } | |
| 63 // get config file name | |
| 64 String fn = c.getInitParameter("config-file"); | |
| 65 if (fn == null) { | |
| 66 util.dprintln(4, "setConfig: no param config-file"); | |
| 67 return; | |
| 68 } | |
| 69 File f = new File(fn); | |
| 70 // setup config file list reader | |
| 71 XMLListLoader lilo = new XMLListLoader("digilib-config", "parameter", "name", "value"); | |
| 72 try { | |
| 73 confTable = lilo.loadURL(f.toURL().toString()); | |
| 74 } catch (Exception e) { | |
| 75 util.dprintln(4, "setConfig: unable to read file "+fn); | |
| 76 throw new ServletException(e); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /** | |
|
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81 * convert a string with a list of pathnames into an array of strings |
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82 * using the system's path seperator string |
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83 */ |
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84 public String[] getPathArray(String paths) { |
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85 // split list into directories |
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86 StringTokenizer dirs = new StringTokenizer(paths, java.io.File.pathSeparator); |
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87 int n = dirs.countTokens(); |
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88 if (n < 1) { |
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89 return null; |
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90 } |
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91 // add directories into array |
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92 String[] pathArray = new String[n]; |
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93 for (int i = 0; i < n; i++) { |
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94 pathArray[i] = dirs.nextToken(); |
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95 } |
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96 return pathArray; |
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97 } |
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98 |
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99 /** |
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100 * getPathArray with default fall back |
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101 */ |
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102 public String[] tryToGetPathArray(String paths, String[] defaultPath) { |
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103 String[] pa = getPathArray(paths); |
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104 return (pa != null) ? pa : defaultPath; |
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105 } |
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106 |
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107 /** |
| 1 | 108 * print a servlet response and exit |
| 109 */ | |
| 110 public static void htmlMessage(String s, HttpServletResponse response) throws IOException { | |
| 111 response.setContentType("text/html; charset=iso-8859-1"); | |
| 112 PrintWriter out = response.getWriter(); | |
| 113 out.println("<html>"); | |
| 114 out.println("<head><title>Scaler</title></head>"); | |
| 115 out.println("<body>"); | |
| 116 out.println("<p>"+s+"</p>"); | |
| 117 out.println("</body></html>"); | |
| 118 } | |
| 119 | |
| 73 | 120 /** Transfers an image file as-is. |
| 121 * | |
| 122 * The local file is copied to the <code>OutputStream</code> of the | |
| 123 * <code>ServletResponse</code>. The mime-type for the response is detected | |
| 124 * from the file. | |
| 125 * | |
| 126 * @param f Image file to be sent. | |
| 127 * @param res ServletResponse where the image file will be sent. | |
| 128 * @throws FileOpException Exception is thrown for a IOException. | |
| 129 */ | |
| 130 public void sendFile(File f, ServletResponse response) throws FileOpException { | |
| 131 util.dprintln(4, "sendFile("+f+")"); | |
| 132 String mimeType = FileOps.mimeForFile(f); | |
| 133 if (mimeType == null) { | |
| 134 util.dprintln(2, "ERROR(sendFile): unknown file Type"); | |
| 135 throw new FileOpException("Unknown file type."); | |
| 136 } | |
| 137 response.setContentType(mimeType); | |
| 138 // open file | |
| 139 try { | |
| 140 FileInputStream inFile = new FileInputStream(f); | |
| 141 OutputStream outStream = response.getOutputStream(); | |
| 142 byte dataBuffer[] = new byte[4096]; | |
| 143 int len; | |
| 144 while ((len = inFile.read(dataBuffer)) != -1) { | |
| 145 // copy out file | |
| 146 outStream.write(dataBuffer, 0, len); | |
| 147 } | |
| 148 inFile.close(); | |
| 149 } catch (IOException e) { | |
| 150 util.dprintln(2, "ERROR(sendFile): unable to send file"); | |
| 151 throw new FileOpException("Unable to send file."); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 | |
| 1 | 156 /** |
| 157 * get a parameter from request and return it if set, otherwise return default | |
| 158 */ | |
| 159 public int tryToGetParam(String s, int i, HttpServletRequest r) { | |
| 160 try { | |
| 161 i = Integer.parseInt(r.getParameter(s)); | |
| 162 } catch(Exception e) { | |
| 163 util.dprintln(4, "trytoGetParam(int) failed on param "+s); | |
| 164 //e.printStackTrace(); | |
| 165 } | |
| 166 return i; | |
| 167 } | |
| 168 public float tryToGetParam(String s, float f, HttpServletRequest r) { | |
| 169 try { | |
| 170 f = Float.parseFloat(r.getParameter(s)); | |
| 171 } catch(Exception e) { | |
| 172 util.dprintln(4, "trytoGetParam(float) failed on param "+s); | |
| 173 //e.printStackTrace(); | |
| 174 } | |
| 175 return f; | |
| 176 } | |
| 177 public String tryToGetParam(String s, String x, HttpServletRequest r) { | |
| 178 if (r.getParameter(s) != null) { | |
| 179 x = r.getParameter(s); | |
| 180 } else { | |
| 181 util.dprintln(4, "trytoGetParam(string) failed on param "+s); | |
| 182 } | |
| 183 return x; | |
| 184 } | |
| 185 | |
| 186 | |
| 187 /** | |
| 188 * get an init parameter from config and return it if set, otherwise return default | |
| 189 */ | |
| 190 public int tryToGetInitParam(String s, int i) { | |
| 191 //System.out.println("trytogetInitParam("+s+", "+i+")"); | |
| 192 try { | |
| 193 //System.out.println("trytogetInitParam: "+(String)confTable.get(s)); | |
| 194 i = Integer.parseInt((String)confTable.get(s)); | |
| 195 } catch(Exception e) { | |
| 196 util.dprintln(4, "trytogetInitParam(int) failed on param "+s); | |
| 197 //e.printStackTrace(); | |
| 198 } | |
| 199 return i; | |
| 200 } | |
| 201 public float tryToGetInitParam(String s, float f) { | |
| 202 try { | |
| 203 f = Float.parseFloat((String)confTable.get(s)); | |
| 204 } catch(Exception e) { | |
| 205 util.dprintln(4, "trytoGetInitParam(float) failed on param "+s); | |
| 206 //e.printStackTrace(); | |
| 207 } | |
| 208 return f; | |
| 209 } | |
| 210 public String tryToGetInitParam(String s, String x) { | |
| 211 if ((confTable != null)&&((String)confTable.get(s) != null)) { | |
| 212 x = (String)confTable.get(s); | |
| 213 } else { | |
| 214 util.dprintln(4, "trytoGetInitParam(string) failed on param "+s); | |
| 215 } | |
| 216 return x; | |
| 217 } | |
| 218 | |
| 219 } |