專案要用到doc轉pdf的功能，一番google之後總結出了三種方法（免費方案）

方法1.poi讀取doc + itext生成pdf （實現最方便，效果最差，跨平臺）
方法2.jodconverter + openOffice （一般格式實現效果還行，複雜格式容易有錯位，跨平臺）
方法3.jacob + msOfficeWord + SaveAsPDFandXPS （完美保持原doc格式，效率最慢，只能在windows環境下進行）

public void doc2pdf(String docFileName) throws Exception{
        String path =  this.getSession().getServletContext().getRealPath("/")+"attachment/";        
        Parser p = new DocParser();// create a new parser instance
        FileInputStream fis = new FileInputStream(path+"/doc/"+ docFileName + ".doc");// creating InputStream for use with parser
        DocumentElement mydoc = p.parse(fis,true,false);// parse document from input stream
        DocWriter w = new PDFWriter();// create PDF writer
        w.writeDocument(mydoc,new FileOutputStream(path+"/pdf/"+docFileName + ".pdf"));// write document as pdf using writer
        w = new XHTMLWriter();
        w.writeDocument(mydoc,new FileOutputStream(path+"/pdf/"+docFileName + ".html"));// write document as xhtml
    }
 

public String materialUpload(){
        try {
            doc2pdf("ttt");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return SUCCESS;
    }

方法2：使用jodconverter來呼叫openOffice的服務來轉換，openOffice有個各個平臺的版本，所以這種方法跟方法1一樣都是跨平臺的。

mac下的啟動方法為終端輸入

/Applications/OpenOffice.org.app/Contents/MacOS/soffice "-accept=socket,host=localhost,port=8100;urp;StarOffice.ServiceManager" -nologo -headless

public void createPdf(String docFileName) throws IOException{ 
        String path =  this.getSession().getServletContext().getRealPath("/")+"attachment/";
        File inputFile = new File(path+"/doc/"+ docFileName + ".doc");
        File outputFile = new File(path+"/pdf/"+docFileName + ".pdf");
         
        // connect to an OpenOffice.org instance running on port 8100
        OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
        connection.connect();
         
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(inputFile, outputFile);
         
        // close the connection
        connection.disconnect();
    }

方法2的截圖(格式基本一致，有錯位)

方法3：效果最好的一種方法，但是需要window環境，而且速度是最慢的需要安裝msofficeWord以及SaveAsPDFandXPS.exe(word的一個外掛，用來把word轉化為pdf)
Office版本是2007，因為SaveAsPDFandXPS是微軟為office2007及以上版本開發的外掛
SaveAsPDFandXPS下載地址：http://www.microsoft.com/zh-cn/download/details.aspx?id=7
jacob 包下載地址：http://sourceforge.net/projects/jacob-project/
我下的是jacob-1.17-M2.zip
下載下來的jacob裡的jar包匯入到專案裡，
jacob的dll檔案放到到你的jdk/jre/bin下面（不放會報錯：java.lang.NoClassDefFoundError: Could not initialize class com.jacob.com.Dispatch）

網上還有一種是把dll放在放在以下程式碼輸出的路徑裡的任意一個路徑目錄

System.getProperty("java.library.path");

static final int wdFormatPDF = 17;// PDF 格式    
    public void wordToPDF(String docFileName){    
            
        System.out.println("啟動Word...");      
        long start = System.currentTimeMillis();      
        ActiveXComponent app = null;  
        Dispatch doc = null;  
        try {      
            app = new ActiveXComponent("Word.Application");      
            app.setProperty("Visible", new Variant(false));  
            Dispatch docs = app.getProperty("Documents").toDispatch();    
            
            String path =  this.getSession().getServletContext().getRealPath("/")+"attachment/";
            String sfileName = path+"/doc/"+ docFileName + ".doc";
            String toFileName = path+"/pdf/"+ docFileName + ".pdf";
            
            doc = Dispatch.call(docs,  "Open" , sfileName).toDispatch();  
            System.out.println("開啟文件..." + sfileName);  
            System.out.println("轉換文件到PDF..." + toFileName);      
            File tofile = new File(toFileName);      
            if (tofile.exists()) {      
                tofile.delete();      
            }      
            Dispatch.call(doc,      
                          "SaveAs",      
                          toFileName, // FileName      
                          wdFormatPDF);      
            long end = System.currentTimeMillis();      
            System.out.println("轉換完成..用時：" + (end - start) + "ms.");  
              
                
        } catch (Exception e) {      
            System.out.println("========Error:文件轉換失敗：" + e.getMessage());      
        } finally {  
            Dispatch.call(doc,"Close",false);  
            System.out.println("關閉文件");  
            if (app != null)      
                app.invoke("Quit", new Variant[] {});      
            }  
          //如果沒有這句話,winword.exe程序將不會關閉  
           ComThread.Release();
           
    }

========Error:文件轉換失敗：Invoke of: SaveAs
Source: Microsoft Word
Description: