servletutilities.html

JFreeChart 9.20的文档 需要用JAVA在网页上做统计图的东东

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<A NAME="getTempFilePrefix()"><!-- --></A><H3>
getTempFilePrefix</H3>
<PRE>
public static java.lang.String <B>getTempFilePrefix</B>()</PRE>
<DL>
<DD>Returns the prefix for the temporary file names generated by this class.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The prefix (never <code>null</code>).</DL>
</DD>
</DL>
<HR>

<A NAME="setTempFilePrefix(java.lang.String)"><!-- --></A><H3>
setTempFilePrefix</H3>
<PRE>
public static void <B>setTempFilePrefix</B>(java.lang.String&nbsp;prefix)</PRE>
<DL>
<DD>Sets the prefix for the temporary file names generated by this class.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>prefix</CODE> - the prefix (<code>null</code> not permitted).</DL>
</DD>
</DL>
<HR>

<A NAME="saveChartAsPNG(org.jfree.chart.JFreeChart, int, int, javax.servlet.http.HttpSession)"><!-- --></A><H3>
saveChartAsPNG</H3>
<PRE>
public static java.lang.String <B>saveChartAsPNG</B>(<A HREF="../../../../org/jfree/chart/JFreeChart.html" title="class in org.jfree.chart">JFreeChart</A>&nbsp;chart,
                                              int&nbsp;width,
                                              int&nbsp;height,
                                              javax.servlet.http.HttpSession&nbsp;session)
                                       throws java.io.IOException</PRE>
<DL>
<DD>Saves the chart as a PNG format file in the temporary directory.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>chart</CODE> - the JFreeChart to be saved.<DD><CODE>width</CODE> - the width of the chart.<DD><CODE>height</CODE> - the height of the chart.<DD><CODE>session</CODE> - the HttpSession of the client.
<DT><B>Returns:</B><DD>the filename of the chart saved in the temporary directory.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is a problem saving the file.</DL>
</DD>
</DL>
<HR>

<A NAME="saveChartAsPNG(org.jfree.chart.JFreeChart, int, int, org.jfree.chart.ChartRenderingInfo, javax.servlet.http.HttpSession)"><!-- --></A><H3>
saveChartAsPNG</H3>
<PRE>
public static java.lang.String <B>saveChartAsPNG</B>(<A HREF="../../../../org/jfree/chart/JFreeChart.html" title="class in org.jfree.chart">JFreeChart</A>&nbsp;chart,
                                              int&nbsp;width,
                                              int&nbsp;height,
                                              <A HREF="../../../../org/jfree/chart/ChartRenderingInfo.html" title="class in org.jfree.chart">ChartRenderingInfo</A>&nbsp;info,
                                              javax.servlet.http.HttpSession&nbsp;session)
                                       throws java.io.IOException</PRE>
<DL>
<DD>Saves the chart as a PNG format file in the temporary directory and
 populates the ChartRenderingInfo object which can be used to generate
 an HTML image map.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>chart</CODE> - the chart to be saved (<code>null</code> not permitted).<DD><CODE>width</CODE> - the width of the chart.<DD><CODE>height</CODE> - the height of the chart.<DD><CODE>info</CODE> - the ChartRenderingInfo object to be populated (<code>null</code> permitted).<DD><CODE>session</CODE> - the HttpSession of the client.
<DT><B>Returns:</B><DD>the filename of the chart saved in the temporary directory.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is a problem saving the file.</DL>
</DD>
</DL>
<HR>

<A NAME="saveChartAsJPEG(org.jfree.chart.JFreeChart, int, int, javax.servlet.http.HttpSession)"><!-- --></A><H3>
saveChartAsJPEG</H3>
<PRE>
public static java.lang.String <B>saveChartAsJPEG</B>(<A HREF="../../../../org/jfree/chart/JFreeChart.html" title="class in org.jfree.chart">JFreeChart</A>&nbsp;chart,
                                               int&nbsp;width,
                                               int&nbsp;height,
                                               javax.servlet.http.HttpSession&nbsp;session)
                                        throws java.io.IOException</PRE>
<DL>
<DD>Saves the chart as a JPEG format file in the temporary directory.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>chart</CODE> - the JFreeChart to be saved.<DD><CODE>width</CODE> - the width of the chart.<DD><CODE>height</CODE> - the height of the chart.<DD><CODE>session</CODE> - the HttpSession of the client.
<DT><B>Returns:</B><DD>the filename of the chart saved in the temporary directory.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is a problem saving the file.</DL>
</DD>
</DL>
<HR>

<A NAME="saveChartAsJPEG(org.jfree.chart.JFreeChart, int, int, org.jfree.chart.ChartRenderingInfo, javax.servlet.http.HttpSession)"><!-- --></A><H3>
saveChartAsJPEG</H3>
<PRE>
public static java.lang.String <B>saveChartAsJPEG</B>(<A HREF="../../../../org/jfree/chart/JFreeChart.html" title="class in org.jfree.chart">JFreeChart</A>&nbsp;chart,
                                               int&nbsp;width,
                                               int&nbsp;height,
                                               <A HREF="../../../../org/jfree/chart/ChartRenderingInfo.html" title="class in org.jfree.chart">ChartRenderingInfo</A>&nbsp;info,
                                               javax.servlet.http.HttpSession&nbsp;session)
                                        throws java.io.IOException</PRE>
<DL>
<DD>Saves the chart as a JPEG format file in the temporary directory and
 populates the ChartRenderingInfo object which can be used to generate
 an HTML image map.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>chart</CODE> - the chart to be saved (<code>null</code> not permitted).<DD><CODE>width</CODE> - the width of the chart<DD><CODE>height</CODE> - the height of the chart<DD><CODE>info</CODE> - the ChartRenderingInfo object to be populated<DD><CODE>session</CODE> - the HttpSession of the client
<DT><B>Returns:</B><DD>the filename of the chart saved in the temporary directory
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is a problem saving the file.</DL>
</DD>
</DL>
<HR>

<A NAME="createTempDir()"><!-- --></A><H3>
createTempDir</H3>
<PRE>
protected static void <B>createTempDir</B>()</PRE>
<DL>
<DD>Creates the temporary directory if it does not exist.
 Throws a RuntimeException if the temporary directory is null.
 Uses the system property java.io.tmpdir as the temporary directory.
 Sounds like a strange thing to do but my temporary directory was not created
 on my default Tomcat 4.0.3 installation.  Could save some questions on the
 forum if it is created when not present.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="registerChartForDeletion(java.io.File, javax.servlet.http.HttpSession)"><!-- --></A><H3>
registerChartForDeletion</H3>
<PRE>
protected static void <B>registerChartForDeletion</B>(java.io.File&nbsp;tempFile,
                                               javax.servlet.http.HttpSession&nbsp;session)</PRE>
<DL>
<DD>Adds a ChartDeleter object to the session object with the name JFreeChart_Deleter
 if there is not already one bound to the session and adds the filename to the
 list of charts to be deleted.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>tempFile</CODE> - the file to be deleted.<DD><CODE>session</CODE> - the HTTP session of the client.</DL>
</DD>
</DL>
<HR>

<A NAME="sendTempFile(java.lang.String, javax.servlet.http.HttpServletResponse)"><!-- --></A><H3>
sendTempFile</H3>
<PRE>
public static void <B>sendTempFile</B>(java.lang.String&nbsp;filename,
                                javax.servlet.http.HttpServletResponse&nbsp;response)
                         throws java.io.IOException</PRE>
<DL>
<DD>Binary streams the specified file in the temporary directory to the
 HTTP response in 1KB chunks
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filename</CODE> - The name of the file in the temporary directory.<DD><CODE>response</CODE> - The HTTP response object.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is an I/O problem.</DL>
</DD>
</DL>
<HR>

<A NAME="sendTempFile(java.io.File, javax.servlet.http.HttpServletResponse)"><!-- --></A><H3>
sendTempFile</H3>
<PRE>
public static void <B>sendTempFile</B>(java.io.File&nbsp;file,
                                javax.servlet.http.HttpServletResponse&nbsp;response)
                         throws java.io.IOException</PRE>
<DL>
<DD>Binary streams the specified file to the HTTP response in 1KB chunks
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>file</CODE> - The file to be streamed.<DD><CODE>response</CODE> - The HTTP response object.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is an I/O problem.</DL>
</DD>
</DL>
<HR>

<A NAME="sendTempFile(java.io.File, javax.servlet.http.HttpServletResponse, java.lang.String)"><!-- --></A><H3>
sendTempFile</H3>
<PRE>
public static void <B>sendTempFile</B>(java.io.File&nbsp;file,
                                javax.servlet.http.HttpServletResponse&nbsp;response,
                                java.lang.String&nbsp;mimeType)
                         throws java.io.IOException</PRE>
<DL>
<DD>Binary streams the specified file to the HTTP response in 1KB chunks
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>file</CODE> - The file to be streamed.<DD><CODE>response</CODE> - The HTTP response object.<DD><CODE>mimeType</CODE> - The mime type of the file, null allowed.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is an I/O problem.</DL>
</DD>
</DL>
<HR>

<A NAME="searchReplace(java.lang.String, java.lang.String, java.lang.String)"><!-- --></A><H3>
searchReplace</H3>
<PRE>
public static java.lang.String <B>searchReplace</B>(java.lang.String&nbsp;inputString,
                                             java.lang.String&nbsp;searchString,
                                             java.lang.String&nbsp;replaceString)</PRE>
<DL>
<DD>Perform a search/replace operation on a String
 There are String methods to do this since (JDK 1.4)
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inputString</CODE> - the String to have the search/replace operation.<DD><CODE>searchString</CODE> - the search String.<DD><CODE>replaceString</CODE> - the replace String.
<DT><B>Returns:</B><DD>the String with the replacements made.</DL>
</DD>
</DL>
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