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<HTML><BODY BGCOLOR="white"><PRE><FONT color="green">001</FONT> /* ===========================================================<a name="line.1"></a><FONT color="green">002</FONT> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a><FONT color="green">003</FONT> * ===========================================================<a name="line.3"></a><FONT color="green">004</FONT> *<a name="line.4"></a><FONT color="green">005</FONT> * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.<a name="line.5"></a><FONT color="green">006</FONT> *<a name="line.6"></a><FONT color="green">007</FONT> * Project Info: http://www.jfree.org/jfreechart/index.html<a name="line.7"></a><FONT color="green">008</FONT> *<a name="line.8"></a><FONT color="green">009</FONT> * This library is free software; you can redistribute it and/or modify it <a name="line.9"></a><FONT color="green">010</FONT> * under the terms of the GNU Lesser General Public License as published by <a name="line.10"></a><FONT color="green">011</FONT> * the Free Software Foundation; either version 2.1 of the License, or <a name="line.11"></a><FONT color="green">012</FONT> * (at your option) any later version.<a name="line.12"></a><FONT color="green">013</FONT> *<a name="line.13"></a><FONT color="green">014</FONT> * This library is distributed in the hope that it will be useful, but <a name="line.14"></a><FONT color="green">015</FONT> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY <a name="line.15"></a><FONT color="green">016</FONT> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public <a name="line.16"></a><FONT color="green">017</FONT> * License for more details.<a name="line.17"></a><FONT color="green">018</FONT> *<a name="line.18"></a><FONT color="green">019</FONT> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a><FONT color="green">020</FONT> * License along with this library; if not, write to the Free Software<a name="line.20"></a><FONT color="green">021</FONT> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, <a name="line.21"></a><FONT color="green">022</FONT> * USA. <a name="line.22"></a><FONT color="green">023</FONT> *<a name="line.23"></a><FONT color="green">024</FONT> * [Java is a trademark or registered trademark of Sun Microsystems, Inc. <a name="line.24"></a><FONT color="green">025</FONT> * in the United States and other countries.]<a name="line.25"></a><FONT color="green">026</FONT> *<a name="line.26"></a><FONT color="green">027</FONT> * ---------------------<a name="line.27"></a><FONT color="green">028</FONT> * ServletUtilities.java<a name="line.28"></a><FONT color="green">029</FONT> * ---------------------<a name="line.29"></a><FONT color="green">030</FONT> * (C) Copyright 2002-2006, by Richard Atkinson and Contributors.<a name="line.30"></a><FONT color="green">031</FONT> *<a name="line.31"></a><FONT color="green">032</FONT> * Original Author: Richard Atkinson;<a name="line.32"></a><FONT color="green">033</FONT> * Contributor(s): J?rgen Hoffman;<a name="line.33"></a><FONT color="green">034</FONT> * David Gilbert (for Object Refinery Limited);<a name="line.34"></a><FONT color="green">035</FONT> * Douglas Clayton;<a name="line.35"></a><FONT color="green">036</FONT> *<a name="line.36"></a><FONT color="green">037</FONT> * $Id: ServletUtilities.java,v 1.3.2.2 2006/01/10 15:53:30 mungady Exp $<a name="line.37"></a><FONT color="green">038</FONT> *<a name="line.38"></a><FONT color="green">039</FONT> * Changes<a name="line.39"></a><FONT color="green">040</FONT> * -------<a name="line.40"></a><FONT color="green">041</FONT> * 19-Aug-2002 : Version 1;<a name="line.41"></a><FONT color="green">042</FONT> * 20-Apr-2003 : Added additional sendTempFile method to allow MIME type <a name="line.42"></a><FONT color="green">043</FONT> * specification and modified original sendTempFile method to <a name="line.43"></a><FONT color="green">044</FONT> * automatically set MIME type for JPEG and PNG files<a name="line.44"></a><FONT color="green">045</FONT> * 23-Jun-2003 : Added additional sendTempFile method at the request of <a name="line.45"></a><FONT color="green">046</FONT> * J?rgen Hoffman;<a name="line.46"></a><FONT color="green">047</FONT> * 07-Jul-2003 : Added more header information to streamed images;<a name="line.47"></a><FONT color="green">048</FONT> * 19-Aug-2003 : Forced images to be stored in the temporary directory defined <a name="line.48"></a><FONT color="green">049</FONT> * by System property java.io.tmpdir, rather than default (RA);<a name="line.49"></a><FONT color="green">050</FONT> * 24-Mar-2004 : Added temp filename prefix attribute (DG);<a name="line.50"></a><FONT color="green">051</FONT> * 09-Mar-2005 : Added "one time" file option (DG);<a name="line.51"></a><FONT color="green">052</FONT> * ------------- JFREECHART 1.0.0 RELEASED ------------------------------------<a name="line.52"></a><FONT color="green">053</FONT> * 10-Jan-2006 : Updated API docs and reformatted (DG);<a name="line.53"></a><FONT color="green">054</FONT> *<a name="line.54"></a><FONT color="green">055</FONT> */<a name="line.55"></a><FONT color="green">056</FONT> <a name="line.56"></a><FONT color="green">057</FONT> package org.jfree.chart.servlet;<a name="line.57"></a><FONT color="green">058</FONT> <a name="line.58"></a><FONT color="green">059</FONT> <a name="line.59"></a><FONT color="green">060</FONT> import java.io.BufferedInputStream;<a name="line.60"></a><FONT color="green">061</FONT> import java.io.BufferedOutputStream;<a name="line.61"></a><FONT color="green">062</FONT> import java.io.File;<a name="line.62"></a><FONT color="green">063</FONT> import java.io.FileInputStream;<a name="line.63"></a><FONT color="green">064</FONT> import java.io.FileNotFoundException;<a name="line.64"></a><FONT color="green">065</FONT> import java.io.IOException;<a name="line.65"></a><FONT color="green">066</FONT> import java.text.SimpleDateFormat;<a name="line.66"></a><FONT color="green">067</FONT> import java.util.Date;<a name="line.67"></a><FONT color="green">068</FONT> import java.util.TimeZone;<a name="line.68"></a><FONT color="green">069</FONT> <a name="line.69"></a><FONT color="green">070</FONT> import javax.servlet.http.HttpServletResponse;<a name="line.70"></a><FONT color="green">071</FONT> import javax.servlet.http.HttpSession;<a name="line.71"></a><FONT color="green">072</FONT> <a name="line.72"></a><FONT color="green">073</FONT> import org.jfree.chart.ChartRenderingInfo;<a name="line.73"></a><FONT color="green">074</FONT> import org.jfree.chart.ChartUtilities;<a name="line.74"></a><FONT color="green">075</FONT> import org.jfree.chart.JFreeChart;<a name="line.75"></a><FONT color="green">076</FONT> <a name="line.76"></a><FONT color="green">077</FONT> /**<a name="line.77"></a><FONT color="green">078</FONT> * Utility class used for servlet related JFreeChart operations.<a name="line.78"></a><FONT color="green">079</FONT> */<a name="line.79"></a><FONT color="green">080</FONT> public class ServletUtilities {<a name="line.80"></a><FONT color="green">081</FONT> <a name="line.81"></a><FONT color="green">082</FONT> /** The filename prefix. */<a name="line.82"></a><FONT color="green">083</FONT> private static String tempFilePrefix = "jfreechart-";<a name="line.83"></a><FONT color="green">084</FONT> <a name="line.84"></a><FONT color="green">085</FONT> /** A prefix for "one time" charts. */<a name="line.85"></a><FONT color="green">086</FONT> private static String tempOneTimeFilePrefix = "jfreechart-onetime-";<a name="line.86"></a><FONT color="green">087</FONT> <a name="line.87"></a><FONT color="green">088</FONT> /**<a name="line.88"></a><FONT color="green">089</FONT> * Returns the prefix for the temporary file names generated by this class.<a name="line.89"></a><FONT color="green">090</FONT> * <a name="line.90"></a><FONT color="green">091</FONT> * @return The prefix (never <code>null</code>).<a name="line.91"></a><FONT color="green">092</FONT> */<a name="line.92"></a><FONT color="green">093</FONT> public static String getTempFilePrefix() {<a name="line.93"></a><FONT color="green">094</FONT> return ServletUtilities.tempFilePrefix; <a name="line.94"></a><FONT color="green">095</FONT> }<a name="line.95"></a><FONT color="green">096</FONT> <a name="line.96"></a><FONT color="green">097</FONT> /**<a name="line.97"></a><FONT color="green">098</FONT> * Sets the prefix for the temporary file names generated by this class.<a name="line.98"></a><FONT color="green">099</FONT> * <a name="line.99"></a><FONT color="green">100</FONT> * @param prefix the prefix (<code>null</code> not permitted).<a name="line.100"></a><FONT color="green">101</FONT> */<a name="line.101"></a><FONT color="green">102</FONT> public static void setTempFilePrefix(String prefix) {<a name="line.102"></a><FONT color="green">103</FONT> if (prefix == null) {<a name="line.103"></a><FONT color="green">104</FONT> throw new IllegalArgumentException("Null 'prefix' argument."); <a name="line.104"></a><FONT color="green">105</FONT> }<a name="line.105"></a><FONT color="green">106</FONT> ServletUtilities.tempFilePrefix = prefix;<a name="line.106"></a><FONT color="green">107</FONT> }<a name="line.107"></a><FONT color="green">108</FONT> <a name="line.108"></a><FONT color="green">109</FONT> /**<a name="line.109"></a><FONT color="green">110</FONT> * Returns the prefix for "one time" temporary file names generated by<a name="line.110"></a><FONT color="green">111</FONT> * this class.<a name="line.111"></a><FONT color="green">112</FONT> * <a name="line.112"></a><FONT color="green">113</FONT> * @return The prefix.<a name="line.113"></a><FONT color="green">114</FONT> */<a name="line.114"></a><FONT color="green">115</FONT> public static String getTempOneTimeFilePrefix() {<a name="line.115"></a><FONT color="green">116</FONT> return ServletUtilities.tempOneTimeFilePrefix;<a name="line.116"></a><FONT color="green">117</FONT> }<a name="line.117"></a><FONT color="green">118</FONT> <a name="line.118"></a><FONT color="green">119</FONT> /**<a name="line.119"></a><FONT color="green">120</FONT> * Sets the prefix for the "one time" temporary file names generated by <a name="line.120"></a><FONT color="green">121</FONT> * this class.<a name="line.121"></a><FONT color="green">122</FONT> * <a name="line.122"></a><FONT color="green">123</FONT> * @param prefix the prefix (<code>null</code> not permitted).<a name="line.123"></a><FONT color="green">124</FONT> */<a name="line.124"></a><FONT color="green">125</FONT> public static void setTempOneTimeFilePrefix(String prefix) {<a name="line.125"></a><FONT color="green">126</FONT> if (prefix == null) {<a name="line.126"></a><FONT color="green">127</FONT> throw new IllegalArgumentException("Null 'prefix' argument."); <a name="line.127"></a><FONT color="green">128</FONT> }<a name="line.128"></a><FONT color="green">129</FONT> ServletUtilities.tempOneTimeFilePrefix = prefix;<a name="line.129"></a><FONT color="green">130</FONT> }<a name="line.130"></a><FONT color="green">131</FONT> <a name="line.131"></a><FONT color="green">132</FONT> /**<a name="line.132"></a><FONT color="green">133</FONT> * Saves the chart as a PNG format file in the temporary directory.<a name="line.133"></a><FONT color="green">134</FONT> *<a name="line.134"></a><FONT color="green">135</FONT> * @param chart the JFreeChart to be saved.<a name="line.135"></a><FONT color="green">136</FONT> * @param width the width of the chart.<a name="line.136"></a><FONT color="green">137</FONT> * @param height the height of the chart.<a name="line.137"></a><FONT color="green">138</FONT> * @param session the HttpSession of the client (if <code>null</code>, the<a name="line.138"></a><FONT color="green">139</FONT> * temporary file is marked as "one-time" and deleted by <a name="line.139"></a><FONT color="green">140</FONT> * the {@link DisplayChart} servlet right after it is<a name="line.140"></a><FONT color="green">141</FONT> * streamed to the client).<a name="line.141"></a><FONT color="green">142</FONT> *<a name="line.142"></a><FONT color="green">143</FONT> * @return The filename of the chart saved in the temporary directory.<a name="line.143"></a><FONT color="green">144</FONT> *<a name="line.144"></a><FONT color="green">145</FONT> * @throws IOException if there is a problem saving the file.<a name="line.145"></a><FONT color="green">146</FONT> */<a name="line.146"></a><FONT color="green">147</FONT> public static String saveChartAsPNG(JFreeChart chart, int width, int height,<a name="line.147"></a><FONT color="green">148</FONT> HttpSession session) throws IOException {<a name="line.148"></a><FONT color="green">149</FONT> <a name="line.149"></a><FONT color="green">150</FONT> return ServletUtilities.saveChartAsPNG(chart, width, height, null, <a name="line.150"></a><FONT color="green">151</FONT> session);<a name="line.151"></a><FONT color="green">152</FONT> <a name="line.152"></a><FONT color="green">153</FONT> }<a name="line.153"></a><FONT color="green">154</FONT> <a name="line.154"></a><FONT color="green">155</FONT> /**<a name="line.155"></a><FONT color="green">156</FONT> * Saves the chart as a PNG format file in the temporary directory and<a name="line.156"></a><FONT color="green">157</FONT> * populates the {@link ChartRenderingInfo} object which can be used to <a name="line.157"></a><FONT color="green">158</FONT> * generate an HTML image map.<a name="line.158"></a><FONT color="green">159</FONT> *<a name="line.159"></a><FONT color="green">160</FONT> * @param chart the chart to be saved (<code>null</code> not permitted).<a name="line.160"></a><FONT color="green">161</FONT> * @param width the width of the chart.<a name="line.161"></a><FONT color="green">162</FONT> * @param height the height of the chart.<a name="line.162"></a><FONT color="green">163</FONT> * @param info the ChartRenderingInfo object to be populated <a name="line.163"></a><FONT color="green">164</FONT> * (<code>null</code> permitted).<a name="line.164"></a><FONT color="green">165</FONT> * @param session the HttpSession of the client (if <code>null</code>, the<a name="line.165"></a><FONT color="green">166</FONT> * temporary file is marked as "one-time" and deleted by <a name="line.166"></a>⌨️ 快捷键说明
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