office转pdf（在线预览）思路（java示例）

1.从view访问到controller的思路

2.关于office转换为pdf

实现手段可以参见openoffice转pdf或者别的软件，网上有具体的转换手段，我这里不多说；

大概代码如下，这里的OfficeToPDFInfo是一个包含输入输入路径等的一个Bean：

/** * 将Office文档转换为PDF. 运行该函数需要用到OpenOffice, OpenOffice下载地址为 * http://www.openoffice.org/ * @param sourceFile *            源文件, 绝对路径. 可以是Office2003-2007全部格式的文档, Office2010的没测试. 包括.doc, *            .docx, .xls, .xlsx, .ppt, .pptx等. 示例: F:\\office\\source.doc * @param destFile *            目标文件. 绝对路径. 示例: F:\\pdf\\dest.pdf * @return     操作成功与否的提示信息. 如果返回 -1, 表示找不到源文件, 或url.properties配置错误; 如果返回 0, *            则表示操作成功; 返回1, 则表示转换失败 */private static int office2PDF(OfficeToPDFInfo officeToPDFInfo) {String sourceFile=officeToPDFInfo.sourceUrl;String destFile=officeToPDFInfo.destUrl;String OpenOffice_HOME=officeToPDFInfo.openOfficeHOME;try {File inputFile = new File(sourceFile);if (!inputFile.exists()) {return -1;// 找不到源文件, 则返回-1}// 如果目标路径不存在, 则新建该路径File outputFile = new File(destFile);if (!outputFile.getParentFile().exists()) {outputFile.getParentFile().mkdirs();}//= "D:\\Program Files\\OpenOffice.org 3";//这里是OpenOffice的安装目录, 在我的项目中,为了便于拓展接口,没有直接写成这个样子,但是这样是绝对没问题的// 如果从文件中读取的URL地址最后一个字符不是 '\'，则添加'\'if (OpenOffice_HOME.charAt(OpenOffice_HOME.length() - 1) != '\\') {OpenOffice_HOME += "\\";}// 启动OpenOffice的服务String command = OpenOffice_HOME+ "program\\soffice.exe -headless -accept=\"socket,host=127.0.0.1,port=8100;urp;StarOffice.ServiceManager\" -nofirststartwizard";Process pro = Runtime.getRuntime().exec(command);// connect to an OpenOffice.org instance running on port 8100OpenOfficeConnection connection = new SocketOpenOfficeConnection("127.0.0.1", 8100);connection.connect();// convertDocumentConverter converter = new OpenOfficeDocumentConverter(connection);//DocumentConverter converter = new StreamOpenOfficeDocumentConverter(connection); converter.convert(inputFile, outputFile);// close the connectionconnection.disconnect();// 关闭OpenOffice服务的进程pro.destroy();return 0;} catch (FileNotFoundException e) {e.printStackTrace();return -1;} catch (ConnectException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return 1;}

public class OfficeToPDFInfo {/** * 转换的来源路径 */public String sourceUrl; /** * 转换后的本地路径 */public String destUrl;/** * 这里是OpenOffice的安装目录 */public String openOfficeHOME;/** * 单个任务执行的超时时间; */public Integer task_execution_timeout;}

3.转换队列

为了更加合理的利用资源，一个转换队列是必不可少的，这里用一个线程list作为线程队列，用另外一个线程来管理这个队列；

用一个map来记录相关的状态；

转换的自定义Properties，其中转换的并行度最好和其服务器的cpu虚拟核心数量相同：

 

public class OfficeToPDFProperty {/** * 转换后的本地保存文件夹 */public String destFolder;/** * 这里是OpenOffice的安装目录 */public String openOfficeHome="";/** * 单个任务执行的超时时间; */public Integer task_execution_timeout=60000;/** * 同时转换的最大并发数量； */public int maxThreadCount=0;/** * 转换完成的状态保持时间 */public int convertionStatusKeepTime=0;/** * 转换（包括失败），最多convertionTryCount次； */public int convertionTryCount=0;/** * 当前pdf转换状态的最大保存数量，超过此数量后将会抛弃时间最久的状态； */public int convertionStatusMaxCount=1000;/** * 被转换的office文档的文件最大大小，超过此大小后，将不会转换； * 默认100M,单位字节; */public int fileMaxSize=104857600;}

转换的线程管理：

public class OfficeToPDFService {/** * 将运行前的线程加入线程池，运行开始后移出线程池；线程池中保存的是当前等待转换的线程队列 */private static List<Thread> office2PDFThreadPool=new LinkedList<Thread>();/** * 当前正在运行的转换线程的数量 */private static int convertionCount=0; private static Thread initConvertionThread=null;/** * 初始化线程池的运行,每2秒钟，检查一次转换的线程池 */private static synchronized void initConvertionThreadPool(){OfficeToPDFProperty officeToPDFProperty=null;try {officeToPDFProperty = OfficeToPDFPropertyService.getOfficeToPDFProperty();} catch (InstantiationException | IllegalAccessException | IOException e1) {e1.printStackTrace();}final int maxCount=officeToPDFProperty.maxThreadCount;if(initConvertionThread==null){initConvertionThread=new Thread(new Runnable() {@Overridepublic void run() {while(true){int i=0;if(getConvertionCount()<maxCount&&getThreadWaitCount()>i){Thread converThread=getOffice2PDFThreadByThreadPool(i);if(!converThread.isAlive()){converThread.start();continue;}i++;}try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}}}});initConvertionThread.start();}}/** * 将状态为非结束状态的转换的文件加入转换池中 * 只转换OfficeConverionStatus.NoStart的文件 * @param path * @param desPath */public static void addOfficeFileToConvertionThreadPool(final String path,final String desPath) {initConvertionThreadPool();final String originFileName=FileUtils.getFileNameByPath(path);OfficeConverionStatus status=MyConstants.getConvertionType(originFileName);if(status!=OfficeConverionStatus.NoStart)return;MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Ready);final Thread thread=new Thread(new Runnable() {@Overridepublic void run() {decrementConvertionCount();try {incrementConvertionCount();MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Converting);OfficeToPDFProperty officeToPDFProperty=OfficeToPDFPropertyService.getOfficeToPDFProperty();OfficeToPDFInfo info=new OfficeToPDFInfo();info.destUrl=desPath;info.sourceUrl=path;info.openOfficeHOME=officeToPDFProperty.openOfficeHome;info.task_execution_timeout=officeToPDFProperty.task_execution_timeout;int result=1;int convertionTryCount=officeToPDFProperty.convertionTryCount;while(result!=0&&convertionTryCount-->0){try {result=office2PDF(info);} catch (Exception e) {e.printStackTrace();result=1;}}//end whileif(result==-1){MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.NoFile);}else if(result==1){MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Faild);}else if(result==0){MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Success);}} catch (InstantiationException e) {e.printStackTrace();MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Faild);} catch (IllegalAccessException e) {e.printStackTrace();MyConstants.putConvertionStatus(originFileName, OfficeConverionStatus.Faild);} catch (IOException e) {e.printStackTrace();MyConstants.putConvertionStatus(originFileName,OfficeConverionStatus.Faild);}finally{removeThreadFromOffice2PDFThreadPool(Thread.currentThread());}}});addThreadTOOffice2PDFThreadPool(thread);}/** * 得到当前等待的线程的数量 * @return */public static synchronized int getThreadWaitCount(){return office2PDFThreadPool.size();}public static synchronized Thread getOffice2PDFThreadByThreadPool(int index) {return office2PDFThreadPool.get(index);}public static synchronized void addThreadTOOffice2PDFThreadPool(Thread office2pdfThread) {office2PDFThreadPool.add(office2pdfThread);}private static synchronized void removeThreadFromOffice2PDFThreadPool(Thread office2pdfThread) {office2PDFThreadPool.remove(office2pdfThread);}private synchronized static  int getConvertionCount() {return convertionCount;}private  synchronized static void incrementConvertionCount() {convertionCount = convertionCount+1;}private synchronized static void decrementConvertionCount(){convertionCount = convertionCount-1;}

4.转换状态的保存：

public class MyConstants {private static String[] officeFile=new String[]{"doc","docx","ppt","pptx","xls","xlsx"};public static String[] getOfficeFileExtentionNames(){return officeFile;}/** * 判断是否是office文件 * @param path * @return */public static boolean isOfficeFile(String path){if(StringJudgeUtils.isEmpty(path))return false;for(int i=0;i<officeFile.length;i++){String nameString=FileUtils.getFileExtension(path);if(nameString.equalsIgnoreCase(officeFile[i])){return true;}}return false;}/***用来保存转换的状态**/private static Map<String, OfficeConverionStatus> convertionTypes=new HashMap<String, OfficeConverionStatus>();/** *  * @param originFileName 转换之前的文件名称 * @return 当前转换的状态 */public static synchronized OfficeConverionStatus getConvertionType(String originFileName){OfficeConverionStatus converionStatus=convertionTypes.get(originFileName);if(converionStatus==null)converionStatus=OfficeConverionStatus.NoStart;return converionStatus;}/** * 加入新的转换状态的时候，会自动移出旧的状态； * @param originFileName * @param converionStatus 当前转换的状态 */public static synchronized void putConvertionStatus(String originFileName,OfficeConverionStatus converionStatus){convertionTypes.put(originFileName,converionStatus);putConvertionTime(originFileName, System.currentTimeMillis());}/** * 将指定文件名的状态移出 * @param originFileName */private static synchronized void removeConvertionStatus(String originFileName){convertionTypes.remove(originFileName);}/** * 保存线程转换的结束时间和线程转换的状态相对应，转换结束后24小时内没有访问结果的将会被清除； */private static Map<String, Long> convertionTimeMap=new HashMap<String, Long>();/** *  * @param originFileName 转换之前的文件名称 * @return 当前转换的状态 */public static synchronized Long getConvertionTime(String originFileName){Long converionTime=convertionTimeMap.get(originFileName);if(converionTime==null)converionTime=new Date(2000,1,1).getTime();return converionTime;}public static synchronized int getConvertionTypesSize(){return convertionTypes.size();}/** * 加入新的转换状态的时候，会自动移出旧的状态； * 数量超过convertionStatusMaxCount会移出更多老旧状态 * @param originFileName * @param cTime */private static synchronized void putConvertionTime(String originFileName,Long cTime){convertionTimeMap.put(originFileName,cTime);Set<String> keySet=convertionTimeMap.keySet();OfficeToPDFProperty officeToPDFProperty;try {officeToPDFProperty = OfficeToPDFPropertyService.getOfficeToPDFProperty();int keepTimeLong=officeToPDFProperty.convertionStatusKeepTime;int convertionStatusMaxCount=officeToPDFProperty.convertionStatusMaxCount;List<String> removeKeyStrings=new ArrayList<String>();do{for(String key:keySet){Long timeLong=convertionTimeMap.get(key);if(System.currentTimeMillis()-timeLong>keepTimeLong){removeKeyStrings.add(key);}}for(String key:removeKeyStrings){convertionTimeMap.remove(key);removeConvertionStatus(key);}keepTimeLong=(int)(keepTimeLong*0.95);}while(getConvertionTypesSize()>convertionStatusMaxCount);} catch (InstantiationException | IllegalAccessException | IOException e) {e.printStackTrace();}}/*public static synchronized void removeConvertionTime(String originFileName){convertionTime.remove(originFileName);}*/}

5.小结

注意线程之间的加锁互斥，没有贴出的代码无关核心思想，因为时间原因，以后以机会可以做成模块，打包为jar形式，不过openoffice转pdf的时候，

遇到部分ppt文档可能会出现转换失败的情况；