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\\SWFTools
		String 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       <[email protected]>
//      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:[email protected]">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。