servletutilities.html

jfreechart1。0。2的api。

<FONT color="green">336</FONT>         * Binary streams the specified file to the HTTP response in 1KB chunks.<a name="line.336"></a>
<FONT color="green">337</FONT>         *<a name="line.337"></a>
<FONT color="green">338</FONT>         * @param file  the file to be streamed.<a name="line.338"></a>
<FONT color="green">339</FONT>         * @param response  the HTTP response object.<a name="line.339"></a>
<FONT color="green">340</FONT>         *<a name="line.340"></a>
<FONT color="green">341</FONT>         * @throws IOException if there is an I/O problem.<a name="line.341"></a>
<FONT color="green">342</FONT>         */<a name="line.342"></a>
<FONT color="green">343</FONT>        public static void sendTempFile(File file, HttpServletResponse response)<a name="line.343"></a>
<FONT color="green">344</FONT>                throws IOException {<a name="line.344"></a>
<FONT color="green">345</FONT>    <a name="line.345"></a>
<FONT color="green">346</FONT>            String mimeType = null;<a name="line.346"></a>
<FONT color="green">347</FONT>            String filename = file.getName();<a name="line.347"></a>
<FONT color="green">348</FONT>            if (filename.length() &gt; 5) {<a name="line.348"></a>
<FONT color="green">349</FONT>                if (filename.substring(filename.length() - 5, <a name="line.349"></a>
<FONT color="green">350</FONT>                        filename.length()).equals(".jpeg")) {<a name="line.350"></a>
<FONT color="green">351</FONT>                    mimeType = "image/jpeg";<a name="line.351"></a>
<FONT color="green">352</FONT>                } <a name="line.352"></a>
<FONT color="green">353</FONT>                else if (filename.substring(filename.length() - 4, <a name="line.353"></a>
<FONT color="green">354</FONT>                        filename.length()).equals(".png")) {<a name="line.354"></a>
<FONT color="green">355</FONT>                    mimeType = "image/png";<a name="line.355"></a>
<FONT color="green">356</FONT>                }<a name="line.356"></a>
<FONT color="green">357</FONT>            }<a name="line.357"></a>
<FONT color="green">358</FONT>            ServletUtilities.sendTempFile(file, response, mimeType);<a name="line.358"></a>
<FONT color="green">359</FONT>        }<a name="line.359"></a>
<FONT color="green">360</FONT>    <a name="line.360"></a>
<FONT color="green">361</FONT>        /**<a name="line.361"></a>
<FONT color="green">362</FONT>         * Binary streams the specified file to the HTTP response in 1KB chunks.<a name="line.362"></a>
<FONT color="green">363</FONT>         *<a name="line.363"></a>
<FONT color="green">364</FONT>         * @param file  the file to be streamed.<a name="line.364"></a>
<FONT color="green">365</FONT>         * @param response  the HTTP response object.<a name="line.365"></a>
<FONT color="green">366</FONT>         * @param mimeType  the mime type of the file, null allowed.<a name="line.366"></a>
<FONT color="green">367</FONT>         *<a name="line.367"></a>
<FONT color="green">368</FONT>         * @throws IOException if there is an I/O problem.<a name="line.368"></a>
<FONT color="green">369</FONT>         */<a name="line.369"></a>
<FONT color="green">370</FONT>        public static void sendTempFile(File file, HttpServletResponse response,<a name="line.370"></a>
<FONT color="green">371</FONT>                                        String mimeType) throws IOException {<a name="line.371"></a>
<FONT color="green">372</FONT>    <a name="line.372"></a>
<FONT color="green">373</FONT>            if (file.exists()) {<a name="line.373"></a>
<FONT color="green">374</FONT>                BufferedInputStream bis = new BufferedInputStream(<a name="line.374"></a>
<FONT color="green">375</FONT>                        new FileInputStream(file));<a name="line.375"></a>
<FONT color="green">376</FONT>    <a name="line.376"></a>
<FONT color="green">377</FONT>                //  Set HTTP headers<a name="line.377"></a>
<FONT color="green">378</FONT>                if (mimeType != null) {<a name="line.378"></a>
<FONT color="green">379</FONT>                    response.setHeader("Content-Type", mimeType);<a name="line.379"></a>
<FONT color="green">380</FONT>                }<a name="line.380"></a>
<FONT color="green">381</FONT>                response.setHeader("Content-Length", String.valueOf(file.length()));<a name="line.381"></a>
<FONT color="green">382</FONT>                SimpleDateFormat sdf = new SimpleDateFormat(<a name="line.382"></a>
<FONT color="green">383</FONT>                        "EEE, dd MMM yyyy HH:mm:ss z");<a name="line.383"></a>
<FONT color="green">384</FONT>                sdf.setTimeZone(TimeZone.getTimeZone("GMT"));<a name="line.384"></a>
<FONT color="green">385</FONT>                response.setHeader("Last-Modified", <a name="line.385"></a>
<FONT color="green">386</FONT>                        sdf.format(new Date(file.lastModified())));<a name="line.386"></a>
<FONT color="green">387</FONT>    <a name="line.387"></a>
<FONT color="green">388</FONT>                BufferedOutputStream bos = new BufferedOutputStream(<a name="line.388"></a>
<FONT color="green">389</FONT>                        response.getOutputStream());<a name="line.389"></a>
<FONT color="green">390</FONT>                byte[] input = new byte[1024];<a name="line.390"></a>
<FONT color="green">391</FONT>                boolean eof = false;<a name="line.391"></a>
<FONT color="green">392</FONT>                while (!eof) {<a name="line.392"></a>
<FONT color="green">393</FONT>                    int length = bis.read(input);<a name="line.393"></a>
<FONT color="green">394</FONT>                    if (length == -1) {<a name="line.394"></a>
<FONT color="green">395</FONT>                        eof = true;<a name="line.395"></a>
<FONT color="green">396</FONT>                    } <a name="line.396"></a>
<FONT color="green">397</FONT>                    else {<a name="line.397"></a>
<FONT color="green">398</FONT>                        bos.write(input, 0, length);<a name="line.398"></a>
<FONT color="green">399</FONT>                    }<a name="line.399"></a>
<FONT color="green">400</FONT>                }<a name="line.400"></a>
<FONT color="green">401</FONT>                bos.flush();<a name="line.401"></a>
<FONT color="green">402</FONT>                bis.close();<a name="line.402"></a>
<FONT color="green">403</FONT>                bos.close();<a name="line.403"></a>
<FONT color="green">404</FONT>            }<a name="line.404"></a>
<FONT color="green">405</FONT>            else {<a name="line.405"></a>
<FONT color="green">406</FONT>                throw new FileNotFoundException(file.getAbsolutePath());<a name="line.406"></a>
<FONT color="green">407</FONT>            }<a name="line.407"></a>
<FONT color="green">408</FONT>            return;<a name="line.408"></a>
<FONT color="green">409</FONT>        }<a name="line.409"></a>
<FONT color="green">410</FONT>    <a name="line.410"></a>
<FONT color="green">411</FONT>        /**<a name="line.411"></a>
<FONT color="green">412</FONT>         * Perform a search/replace operation on a String<a name="line.412"></a>
<FONT color="green">413</FONT>         * There are String methods to do this since (JDK 1.4)<a name="line.413"></a>
<FONT color="green">414</FONT>         *<a name="line.414"></a>
<FONT color="green">415</FONT>         * @param inputString  the String to have the search/replace operation.<a name="line.415"></a>
<FONT color="green">416</FONT>         * @param searchString  the search String.<a name="line.416"></a>
<FONT color="green">417</FONT>         * @param replaceString  the replace String.<a name="line.417"></a>
<FONT color="green">418</FONT>         *<a name="line.418"></a>
<FONT color="green">419</FONT>         * @return The String with the replacements made.<a name="line.419"></a>
<FONT color="green">420</FONT>         */<a name="line.420"></a>
<FONT color="green">421</FONT>        public static String searchReplace(String inputString,<a name="line.421"></a>
<FONT color="green">422</FONT>                                           String searchString,<a name="line.422"></a>
<FONT color="green">423</FONT>                                           String replaceString) {<a name="line.423"></a>
<FONT color="green">424</FONT>    <a name="line.424"></a>
<FONT color="green">425</FONT>            int i = inputString.indexOf(searchString);<a name="line.425"></a>
<FONT color="green">426</FONT>            if (i == -1) {<a name="line.426"></a>
<FONT color="green">427</FONT>                return inputString;<a name="line.427"></a>
<FONT color="green">428</FONT>            }<a name="line.428"></a>
<FONT color="green">429</FONT>    <a name="line.429"></a>
<FONT color="green">430</FONT>            String r = "";<a name="line.430"></a>
<FONT color="green">431</FONT>            r += inputString.substring(0, i) + replaceString;<a name="line.431"></a>
<FONT color="green">432</FONT>            if (i + searchString.length() &lt; inputString.length()) {<a name="line.432"></a>
<FONT color="green">433</FONT>                r += searchReplace(inputString.substring(i + searchString.length()),<a name="line.433"></a>
<FONT color="green">434</FONT>                        searchString, replaceString);<a name="line.434"></a>
<FONT color="green">435</FONT>            }<a name="line.435"></a>
<FONT color="green">436</FONT>    <a name="line.436"></a>
<FONT color="green">437</FONT>            return r;<a name="line.437"></a>
<FONT color="green">438</FONT>        }<a name="line.438"></a>
<FONT color="green">439</FONT>    <a name="line.439"></a>
<FONT color="green">440</FONT>    }<a name="line.440"></a>




























































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