前言

之前用openOffice將docx轉pdf實現線上預覽，但每次都要自己手動cmd啟動，看網上教程說可以下載Server 2003 Resource Kit Tools來自啟動OpenOffice,但是這個連線已經失效並且下載不了了，就選擇採取用java程式碼來啟動OpenOffice,就只要我們電腦安裝了openOffice就可以啦。

方法

* 在FileConvertUtil里加兩個方法

//啟動OpenOffice   servicePath 是OpenOffice的安裝路徑
    public static void startOpenOfficeService(String servicePath) {
        String command = servicePath + "program\\soffice -headless -accept=\"socket,host=127.0.0.1,port=8100;urp;\" -nofirststartwizard";
        try {
            Process pro = Runtime.getRuntime().exec(command);
        } catch (IOException e) {
            System.out.println("OpenOffice服務啟動失敗");
        }
    }


    /**
     *關閉OpenOffice
     **/
    public static void shutdownOpenOfficeService() {
        try {
            Process pro = Runtime.getRuntime().exec("tasklist");
            Scanner in = new Scanner(pro.getInputStream());
            while(in.hasNext()) {
                String proString = in.nextLine();
                if(proString.contains("soffice.exe")) {
                    String cmd = "taskkill /f /im soffice.exe";
                    pro = Runtime.getRuntime().exec(cmd);
                    System.out.println("soffice.exe關閉");
                }
                if(proString.contains("soffice.bin")) {
                    String cmd = "taskkill /f /im soffice.bin";
                    pro = Runtime.getRuntime().exec(cmd);
                    System.out.println("soffice.bin關閉");
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 

* 業務層程式碼調這個方法

//servicePath 是OpenOffice的安裝路徑
private static final String servicePath = "C:\\Program Files (x86)\\OpenOffice 4\\";

//線上預覽
 public OutputStream onlinePreview(@RequestParam("url") String url, HttpServletResponse response) throws Exception {
        //獲取檔案型別

        String suffix = url.substring(url.lastIndexOf('.') + 1);

        if (!suffix.equals("txt") && !suffix.equals("doc") && !suffix.equals("docx") && !suffix.equals("xls")
                && !suffix.equals("xlsx") && !suffix.equals("ppt") && !suffix.equals("pptx") && !suffix.equals("sheet") && !suffix.equals("pdf")) {
            throw new Exception("檔案格式不支援預覽");
        }
        url = url.replace(STORE_PATH, LOCAL_STORE_PATH);
        InputStream in = null;
        //如果是pdf檔案，則不用轉，直接展示
        if (suffix.equals("pdf")) {
            in = new BufferedInputStream(new FileInputStream(url));
        } else {
            //docx檔案則先啟動openOffice
            FileConvertUtil.startOpenOfficeService(servicePath);
            in = FileConvertUtil.convertLocaleFile(url, suffix);
            //關閉openOffice
            FileConvertUtil.shutdownOpenOfficeService();
        }

        // url = String.format("http://"+url);


        OutputStream outputStream = response.getOutputStream();
        //建立存放檔案內容的陣列
        byte[] buff = new byte[1024];
        //所讀取的內容使用n來接收
        int n;
        //當沒有讀取完時,繼續讀取,迴圈
        while ((n = in.read(buff)) != -1) {
            //將位元組陣列的資料全部寫入到輸出流中
            outputStream.write(buff, 0, n);
        }
        //強制將快取區的資料進行輸出
        outputStream.flush();
        //redisTemplate.opsForValue().set("Knowledge:" + url, outputStream.toString());
        //關流
        outputStream.close();
        in.close();

        return outputStream;
    }
 

ok!