调用jacob服务时注意事项

需求有一个将office文件转成PDF并添加水印的功能，office转PDF需要用到jacob功能

转化代码

   private static final int wdFormatPDF = 17;
    private static final int xlTypePDF = 0;
    private static final int ppSaveAsPDF = 32;
    private static final int msoTrue = -1;
    private static final int msofalse = 0;
    public static boolean word2PDF(String inputFile,String pdfFile){
        try{
            ComThread.InitSTA();
        //打开word应用程序
        ActiveXComponent app = new ActiveXComponent("Word.Application");
        //设置word不可见
        app.setProperty("Visible", false);
        //获得word中所有打开的文档,返回Documents对象
        Dispatch docs = app.getProperty("Documents").toDispatch();
        //调用Documents对象中Open方法打开文档，并返回打开的文档对象Document
        Dispatch doc = Dispatch.call(docs,
                                    "Open",
                                    inputFile,
                                    false,
                                    true
                                    ).toDispatch();
        //调用Document对象的SaveAs方法，将文档保存为pdf格式
        /*
        Dispatch.call(doc,
                    "SaveAs",
                    pdfFile,
                    wdFormatPDF     //word保存为pdf格式宏，值为17
                    );
                    */
        Dispatch.call(doc,
                "ExportAsFixedFormat",
                pdfFile,
                wdFormatPDF     //word保存为pdf格式宏，值为17
                );
        //关闭文档
        Dispatch.call(doc, "Close",false);
        //关闭word应用程序
        app.invoke("Quit", 0);
        return true;
    }catch(Exception e){
        e.printStackTrace();
        return false;
    }finally{
        ComThread.Release();
    }
    }
    public static boolean excel2PDF(String inputFile,String pdfFile){
        try{
            ComThread.InitSTA();
            ActiveXComponent app = new ActiveXComponent("Excel.Application");
            app.setProperty("DisplayAlerts", "False");
        app.setProperty("Visible", false);
        Dispatch excels = app.getProperty("Workbooks").toDispatch();
        Dispatch excel = Dispatch.call(excels,
                                    "Open",
                                    inputFile,
                                    false,
                                    true
                                    ).toDispatch();
        Dispatch.call(excel,
                    "ExportAsFixedFormat",
                    xlTypePDF,      
                    pdfFile
                    );
        Dispatch.call(excel, "Close",false);
        app.invoke("Quit");
        return true;
    }catch(Exception e){
        e.printStackTrace();
        return false;
    }finally{
        
        ComThread.Release();
    }
         
    }
    public static boolean ppt2PDF(String inputFile,String pdfFile){
        try{
            ComThread.InitSTA();
        ActiveXComponent app = new ActiveXComponent("PowerPoint.Application");
        //app.setProperty("Visible", msofalse);
        Dispatch ppts = app.getProperty("Presentations").toDispatch();
         
        Dispatch ppt = Dispatch.call(ppts,
                                    "Open",
                                    inputFile,
                                    true,//ReadOnly
                                    true,//Untitled指定文件是否有标题
                                    false//WithWindow指定文件是否可见
                                    ).toDispatch();
         
        Dispatch.call(ppt,
                    "SaveAs",
                    pdfFile,
                    ppSaveAsPDF 
                    );
                 
        Dispatch.call(ppt, "Close");
         
        app.invoke("Quit");
        return true;
        }catch(Exception e){
            return false;
        }finally{
            ComThread.Release();
        }
        
    }