在线显示PDF文档:基于SWFTools + FlexPaper

模块背景：

客户端上传PDF文件，并可以在页面上显示。

解决思路：

 1、利用SWFTools把PDF文件转为swf格式

 2、利用FlexPaper显示转换后的swf文件

操作步骤：

1、下载并安装 SWFTools : http://www.swftools.org/download.html，根据你实际的操作系统选择对应的版本，我最终要部署在AIX上面，不知道麻不麻烦。这里现在Windows下测试。

2、下载FlexPaper:http://flexpaper.devaldi.com

3、对上传的PDF文件进行格式转换：pdf -->swf

public String getCommandStr(File pdfInputFile, String toFileFolder,String swfFileName) {//获取pdf2swf的安装路径，比如 D:\Program Files\\SWFToolsString pdf2swf_path = AppConfig.getProperty("SWFTools.pdf2swf.installPath");StringBuffer pdf2swf_command = null;if (pdf2swf_path != null && !pdf2swf_path.equals("")) {if (!pdf2swf_path.substring(pdf2swf_path.length() - 1,pdf2swf_path.length()).equals(File.separatorChar)) {pdf2swf_path += File.separatorChar;} else {log.error("未配置SWFTools的pdf2swf所在路径！");}log.debug("#######pdf2swf_path:" + pdf2swf_path); pdf2swf_command = new StringBuffer();//组装命令，注意空格pdf2swf_command.append(pdf2swf_path).append("pdf2swf ").append(pdfInputFile).append(" -o ").append(toFileFolder).append(File.separatorChar).append(swfFileName);log.debug("pdf2swf_command:" + pdf2swf_command.toString());}return pdf2swf_command.toString();}

/** * 执行转换命令 * */public void pdf2swf(String commandStr){String commandStr_ = commandStr;ExecRunner exerun = new ExecRunner();try {exerun.exec(commandStr_);} catch (IOException e) {log.error(e.getMessage());} catch (InterruptedException e) {log.error(e.getMessage());}}

上面用到的执行命令的ExecRunner是一个独立的java类，用来执行命令，好处是可以根据实际的操作系统来执行命令：

下面把这个文件贴出来：ExecRunner.java

//// This file is part of the OpenNMS(R) Application.//// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.// OpenNMS(R) is a derivative work, containing both original code, included code and modified// code that was published under the GNU General Public License. Copyrights for modified // and included code are below.//// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.//// For more information contact: //      OpenNMS Licensing       <[e-mail]>//      http://www.opennms.org///      http://www.opennms.com///package com.syni.im800.kb.common.util;////////////////////////////////////////////////////////////////////////////////// Copyright (C) 2002  Scott McCrory//// This program is free software; you can redistribute it and/or// modify it under the terms of the GNU General Public License// as published by the Free Software Foundation; either version 2// of the License, or (at your option) any later version.//// This program is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU General Public License for more details.//// You should have received a copy of the GNU General Public License// along with this program; if not, write to the Free Software// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.////////////////////////////////////////////////////////////////////////////////import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.io.StringWriter;import java.util.Date;import java.util.StringTokenizer;/** * <P> * Runs external executables, optionally under a watched thread. *  * In addition, probably the most useful feature of ExecRunner is using it to * run a command-line program and obtain its stdout and stderr results in two * strings. This is done with exec(String) - see that method for an example. *  * With acknowledgements to Michael C. Daconta, author of "Java Pitfalls, Time * Saving Solutions, and Workarounds to Improve Programs." and his article in * JavaWorld "When Runtime.exec() Won't". * </P> *  * @author <a href="mailto:[e-mail]">Scott McCrory </a>. * @version CVS $Id: ExecRunner.java,v 1.1.2.1 2011/08/10 01:53:25 linshutao Exp $ */public class ExecRunner {    /** Win NT/2K/MEPro require cmd.exe to run programs * */    private static final String WINDOWS_NT_2000_COMMAND_1 = "cmd.exe";    /** Win NT/2K/MEPro require the /C to specify what to run * */    private static final String WINDOWS_NT_2000_COMMAND_2 = "/C";    /** Win 9X/MEHome require cmd.exe to run programs * */    private static final String WINDOWS_9X_ME_COMMAND_1 = "command.exe";    /** Win 9X/MEHome require the /C to specify what to run * */    private static final String WINDOWS_9X_ME_COMMAND_2 = "/C";    /** String to send to STDERR if program exceeds max run time * */    private static final String MAX_RUN_TIME_EXCEEDED_STRING = "MAX_RUN_TIME_EXCEEDED";    /** String to capture STDOUT * */    private String out = new String();    /** String to capture STDERR * */    private String err = new String();    /** Default max run time (in seconds) * */    private int maxRunTimeSecs = 0;    /** Flag to indicate if we've exceeded max run time * */    private boolean maxRunTimeExceeded = false;    /** The name of this class for logging * */    private static final String CLASS_NAME = "ExecRunner";    /** The version of this class (filled in by CVS) * */    private static final String VERSION = "CVS $Revision: 1.1.2.1 {1}quot;;    /** Number of miliseconds to wait between polling watched thread * */    private static final int POLL_DELAY_MS = 100;    /**     * Basic ExecRunner constructor.     *      */    public ExecRunner() {        super();    }    /**     * ExecRunner constructor which also conveniently runs exec(String).     *      * @param command     *            The program or command to run     * @throws ExceptionInInitializerError     *             thrown if a problem occurs     */    public ExecRunner(String command) throws ExceptionInInitializerError {        this();        try {            exec(command);        } catch (IOException ioe) {            throw new ExceptionInInitializerError(ioe.getMessage());        } catch (InterruptedException inte) {            throw new ExceptionInInitializerError(inte.getMessage());        }    }    /**     * We override the <code>clone</code> method here to prevent cloning of     * our class.     *      * @throws CloneNotSupportedException     *             To indicate cloning is not allowed     * @return Nothing ever really returned since we throw a     *         CloneNotSupportedException     */    public final Object clone() throws CloneNotSupportedException {        throw new java.lang.CloneNotSupportedException();    }    /**     * The <B>exec(String) </B> method runs a process inside of a watched     * thread. It returns the client's exit code and feeds its STDOUT and STDERR     * to ExecRunner's out and err strings, where you then use getOutString()     * and getErrString() to obtain these values. Example:     *      * <pre>     *      * // Execute the program and grab the results     * try {     *     ExecRunner er = new ExecRunner();     *     er.setMaxRunTimeSecs(5);     *     er.exec("ls -l");     *     if (!er.getMaxRunTimeExceeded()) {     *         out = er.getOutString();     *         err = er.getErrString();     *     } else {     *         System.out.println("Maximum run time exceeded!");     *     }     * } catch (Exception e) {     *     System.out.println("Error executing " + program + ": " + e.getMessage());     *     continue;     * }     * </pre>     *      * @return The command's return code     * @param command     *            The program or command to run     * @throws IOException     *             thrown if a problem occurs     * @throws InterruptedException     *             thrown if a problem occurs     */    public int exec(String command) throws IOException, InterruptedException {        StringWriter swOut = new StringWriter();        PrintWriter pwOut = new PrintWriter(swOut, true);        StringWriter swErr = new StringWriter();        PrintWriter pwErr = new PrintWriter(swErr, true);        int rc = exec(command, pwOut, pwErr);        out = swOut.toString();        err = swErr.toString();        return rc;    }    /**     * Convenience method for calling exec with OutputStreams.     *      * @return The command's return code     * @param command     *            The program or command to run     * @param stdoutStream     *            java.io.OutputStream     * @param stderrStream     *            java.io.OutputStream     * @throws IOException     *             thrown if a problem occurs     * @throws InterruptedException     *             thrown if a problem occurs     */    public int exec(String command, OutputStream stdoutStream, OutputStream stderrStream) throws IOException, InterruptedException {        PrintWriter pwOut = new PrintWriter(stdoutStream, true);        PrintWriter pwErr = new PrintWriter(stderrStream, true);        return exec(command, pwOut, pwErr);    }    /**     * The <code>exec(String, PrintWriter, PrintWriter)</code> method runs a     * process inside of a watched thread. It returns the client's exit code and     * feeds its STDOUT and STDERR to the passed-in streams.     *      * @return The command's return code     * @param command     *            The program or command to run     * @param stdoutWriter     *            java.io.PrintWriter     * @param stderrWriter     *            java.io.PrintWriter     * @throws IOException     *             thrown if a problem occurs     * @throws InterruptedException     *             thrown if a problem occurs     */    public int exec(String command, PrintWriter stdoutWriter, PrintWriter stderrWriter) throws IOException, InterruptedException {        // Default exit value is non-zero to indicate a problem.        int exitVal = 1;        // //////////////////////////////////////////////////////////////        Runtime rt = Runtime.getRuntime();        Process proc;        String[] cmd = null;        // First get the start time & calculate comparison numbers        Date startTime = new Date();        long startTimeMs = startTime.getTime();        long maxTimeMs = startTimeMs + (maxRunTimeSecs * 1000);        // //////////////////////////////////////////////////////////////        // First determine the OS to build the right command string        String osName = System.getProperty("os.name");        if (osName.equals("Windows NT") || osName.equals("Windows 2000")) {            cmd = new String[3];            cmd[0] = WINDOWS_NT_2000_COMMAND_1;            cmd[1] = WINDOWS_NT_2000_COMMAND_2;            cmd[2] = command;        } else if (osName.equals("Windows 95") || osName.equals("Windows 98") || osName.equals("Windows ME")) {            cmd = new String[3];            cmd[0] = WINDOWS_9X_ME_COMMAND_1;            cmd[1] = WINDOWS_9X_ME_COMMAND_2;            cmd[2] = command;        } else {            // Linux (and probably other *nixes) prefers to be called            // with each argument supplied separately, so we first            // Tokenize it across spaces as the boundary.            StringTokenizer st = new StringTokenizer(command, " ");            cmd = new String[st.countTokens()];            int token = 0;            while (st.hasMoreTokens()) {                String tokenString = st.nextToken();                // System.out.println(tokenString);                cmd[token++] = tokenString;            }        }        // Execute the command and start the two output gobblers        if (cmd != null && cmd.length > 0) {            // System.out.println("**Checkpoint** :" + cmd.length);            proc = rt.exec(cmd);        } else {            throw new IOException("Insufficient commands!");        }        StreamGobbler_ outputGobbler = new StreamGobbler_(proc.getInputStream(), stdoutWriter);        StreamGobbler_ errorGobbler = new StreamGobbler_(proc.getErrorStream(), stderrWriter);        outputGobbler.start();        errorGobbler.start();        // Wait for the program to finish running and return the        // exit value obtained from the executable        while (true) {            try {                exitVal = proc.exitValue();                break;            } catch (IllegalThreadStateException e) {                // If we get this exception, then the process isn't                // done executing and we determine if our time is up.                if (maxRunTimeSecs > 0) {                    Date endTime = new Date();                    long endTimeMs = endTime.getTime();                    if (endTimeMs > maxTimeMs) {                        // Time's up - kill the process and the gobblers and                        // return                        proc.destroy();                        maxRunTimeExceeded = true;                        stderrWriter.println(MAX_RUN_TIME_EXCEEDED_STRING);                        outputGobbler.quit();                        errorGobbler.quit();                        return exitVal;                    } else {                        // Time is not up yet so wait 100 ms before testing                        // again                        Thread.sleep(POLL_DELAY_MS);                    }                }            }        }        // //////////////////////////////////////////////////////////////        // Wait for output gobblers to finish forwarding the output        while (outputGobbler.isAlive() || errorGobbler.isAlive()) {        }        // //////////////////////////////////////////////////////////////        // All done, flush the streams and return the exit value        stdoutWriter.flush();        stderrWriter.flush();        return exitVal;    }    /**     * Returns the error string if exec(String) was invoked.     *      * @return The error string if exec(String) was invoked.     */    public String getErrString() {        return err;    }    /**     * Returns whether the maximum runtime was exceeded or not.     *      * @return boolean indicating whether the maximum runtime was exceeded or     *         not.     */    public boolean isMaxRunTimeExceeded() {        return maxRunTimeExceeded;    }    /**     * Returns the maximum run time in seconds for this object.     *      * @return the maximum run time in seconds for this object.     */    public int getMaxRunTimeSecs() {        return maxRunTimeSecs;    }    /**     * Returns the output string if exec(String) was invoked.     *      * @return The output string if exec(String) was invoked.     */    public String getOutString() {        return out;    }    /**     * This is for unit testing of the class.     *      * @param args     *            an array of command-line arguments     * @throws IOException     *             thrown if a problem occurs     */    public static void main(String[] args) throws IOException {        try {            ExecRunner er = new ExecRunner();            // ///////////////////////////////////////////////////////////////////            // Linux: Test the exec operation with just STDOUT and STDERR            // System.out.println("Testing ExecRunner with STDOUT and            // STDERR...");            // er.exec("ls -l", System.out, System.err);            // System.out.println("Complete");            // ///////////////////////////////////////////////////////////////////            // Windows: Test the exec operation with just STDOUT and STDERR            System.out.println("Testing ExecRunner with StringWriter...");            er = new ExecRunner();            er.setMaxRunTimeSecs(1);            er.exec("dir /s c:\\");            // er.exec("ls -l");            System.out.println("<STDOUT>\n" + er.getOutString() + "</STDOUT>");            System.out.println("<STDERR>\n" + er.getErrString() + "</STDERR>");            System.out.println("Testing Done");            // ///////////////////////////////////////////////////////////////////            // Exit nicely            System.exit(0);        } catch (Exception e) {            e.printStackTrace();            System.exit(1);        }    }    /**     * We override the <code>readObject</code> method here to prevent     * deserialization of our class for security reasons.     *      * @param in     *            java.io.ObjectInputStream     * @throws IOException     *             thrown if a problem occurs     */    private final void readObject(ObjectInputStream in) throws IOException {        throw new IOException("Object cannot be deserialized");    }    /**     * Sets the maximum run time in seconds. If you do not want to limit the     * executable's run time, simply pass in a 0 (which is also the default).     *      * @param max     *            Maximim number of seconds to let program run     */    public void setMaxRunTimeSecs(int max) {        maxRunTimeSecs = max;    }    /**     * We override the <code>writeObject</code> method here to prevent     * serialization of our class for security reasons.     *      * @param out     *            java.io.ObjectOutputStream     * @throws IOException     *             thrown if a problem occurs     */    private final void writeObject(ObjectOutputStream out) throws IOException {        throw new IOException("Object cannot be serialized");    }}

如果成功转换为swf，那么下一步，部署FlexPaper:

把下载回来的FlexPaper复制到你项目的合适地方，我的FlexPaper版本是1.2.4，总共有下面文件：

js 文件夹、FlexPaperViewer.html、FlexPaperViewer.swf、Paper.swf

根据实际需要更改名字。

FlexPaperViewer.html里面根据我的需求进行了更改，主要就是设置swf文件路径，视图的大小等：

 <script type="text/javascript">         var id_ = "${param.id}"; //获取id参数，根据项目存放swf的路径来构造swf的访问路径swfFilePath        var swfFilePath = "/IM800KBS" + "/kbs_user_data/pdf/"+ id_ +"/"+id_+".swf";            <!-- For version detection, set to min. required Flash Player version, or 0 (or 0.0.0), for no version detection. -->             var swfVersionStr = "9.0.124";            <!-- To use express install, set to playerProductInstall.swf, otherwise the empty string. -->            var xiSwfUrlStr = "${expressInstallSwf}";            var flashvars = {                   SwfFile : escape(swfFilePath),  Scale : 0.6,   ZoomTransition : "easeOut",  ZoomTime : 0.5,    ZoomInterval : 0.1,    FitPageOnLoad : false,    FitWidthOnLoad : true,    PrintEnabled : true,    FullScreenAsMaxWindow : true,    localeChain: "en_US"  }; var params = {    }            params.quality = "high";            params.bgcolor = "#ffffff";            params.allowscriptaccess = "sameDomain";            params.allowfullscreen = "true";            var attributes = {};            attributes.id = "FlexPaperViewer";            attributes.name = "FlexPaperViewer";            swfobject.embedSWF(                "FlexPaperViewer.swf", "flashContent",                 "800", "750",                 swfVersionStr, xiSwfUrlStr,                 flashvars, params, attributes);swfobject.createCSS("#flashContent", "display:block;text-align:left;");        </script> 

接下里啊就可以访问页面了。