現在著手做的專案是一個關於考試的，裡面有許多考生的資料資訊是word文件，在這裡耗費了不少的時間，也看了眾多的博文，在這裡發一下我的個人總結，有不對的地方還望指正

用到的jar

 jacob.jar
這是Maven地址http://mvnrepository.com/artifact/net.sf.jacob-project/jacob

/**
     * 申報人doc轉pdf線上瀏覽
     * 
     * @author lrl
     * @date 建立時間 2018-5-24
     * @since V1.0
     */
    public final DataMap queryApplicantDOC2PDF
 
(final DataMap para) throws Exception {

        String sbrid = para.getString("sbrid");

        if (StringUtil.chkStrNull(sbrid)) {
            throw new PadException("申報人ID不允許為空，請檢查重試");
        }

        StringBuffer sqlBF = new StringBuffer();

        sqlBF.setLength(0);
        sqlBF.append(" select sbrdoc, upper(zjhm) zjhm "
 
);
        sqlBF.append("   from vt.applicant ");
        sqlBF.append("  where sbrid = ? ");

        this.sql.setSql(sqlBF.toString());
        sql.setString(1, sbrid);
        DataSet dsApplicant = sql.executeQuery();

        if (dsApplicant.size() <= 0) {
            return null;
        }
        String zjhm = dsApplicant.getString(0
 
, "zjhm");
        String filePath = "temp" + File.separator + GlobalVars.APP_ID;
        String path = filePath + File.separator + zjhm;
        File docFile = new File(path + File.separator + zjhm + ".doc");
        File docPdfFile = new File(path + File.separator + zjhm + "doc.pdf");

         //減少資料庫負擔，直接存在伺服器上快取了
        if (!docPdfFile.exists()) { 
            Blob sbrpdf = dsApplicant.getBlob(0, "sbrdoc");
            int len = (new BigDecimal(sbrpdf.length())).intValue();
            byte[] byteDoc = sbrpdf.getBytes(1, len);
            path = path + File.separator;
            File dir = new File(path);
            if (!dir.exists()) {
                if (!dir.mkdirs()) {
                    throw new Exception("建立目錄失敗!");
                }
            }
            FileIOUtil.writeBytesToFile(byteDoc, docFile);
        }
        try {
          app = new ActiveXComponent("Word.Application");
          Dispatch documents = app.getProperty("Documents").toDispatch();
          Dispatch document = Dispatch.call(documents, "Open", wordFile, false,
                                            true).toDispatch();
          // 判斷檔案存在
          File target = new File(docPdfFile);  
           if (!docPdfFile.exists()) {  
               Dispatch.call(document, "SaveAs", pdfFile, 17);
               Dispatch.call(document, "Close", false);
           }
         }catch(Exception e) {
          System.out.println("轉換失敗"+e.getMessage());
         }finally {
          // 關閉office
          app.invoke("Quit", 0);
         }

        String filePath = Path + File.separator + zjhm + "doc.pdf"
        String fileName = zjhm + "doc.pdf"
        FileInputStream inputstream = null;
        HttpServletResponse response = null;
        try {
            inputstream = new FileInputStream(filePath);
            FileIOUtil.writeStreamToResponse(inputstream, fileName, response);
        } catch (IOException e) {
            throw new Exception("檔案讀取異常：" + e.getMessage());
        } finally {
            try {
                if (inputstream != null) {
                    inputstream.close();
                }
            } catch (Exception e) {
                throw new Exception("檔案損壞或不存在："
                        + e.getMessage());
            }
        }
          return null;
      }