apache poi add image

做文件 docx 麻，難免會用到插圖

其實在原本下載包裡的範例就已經寫得很棒了！
（基本上也只是整個copy過來，加一點變數處理）
PS: 這是使用 3.14 版的，我是知道在 3.10 是跑不出來的

為了自己方便，我加了個 scale，去縮放/限制圖檔的大小

    protected void addImageIntoDocx(XWPFRun r, String imgFile, String scale) throws Exception {

        File img = new File(imgFile);
        if(!img.exists() || img.isDirectory())  {
            throw new Exception("Image not found:"+imgFile);
        }

        int format;

        if(imgFile.endsWith(".emf")) format = XWPFDocument.PICTURE_TYPE_EMF;
        else if(imgFile.endsWith(".wmf")) format = XWPFDocument.PICTURE_TYPE_WMF;
        else if(imgFile.endsWith(".pict")) format = XWPFDocument.PICTURE_TYPE_PICT;
        else if(imgFile.endsWith(".jpeg") || imgFile.endsWith(".jpg")) format = XWPFDocument.PICTURE_TYPE_JPEG;
        else if(imgFile.endsWith(".png")) format = XWPFDocument.PICTURE_TYPE_PNG;
        else if(imgFile.endsWith(".dib")) format = XWPFDocument.PICTURE_TYPE_DIB;
        else if(imgFile.endsWith(".gif")) format = XWPFDocument.PICTURE_TYPE_GIF;
        else if(imgFile.endsWith(".tiff")) format = XWPFDocument.PICTURE_TYPE_TIFF;
        else if(imgFile.endsWith(".eps")) format = XWPFDocument.PICTURE_TYPE_EPS;
        else if(imgFile.endsWith(".bmp")) format = XWPFDocument.PICTURE_TYPE_BMP;
        else if(imgFile.endsWith(".wpg")) format = XWPFDocument.PICTURE_TYPE_WPG;
        else {
            String err = "Unsupported picture: " + imgFile +
                    ". Expected emf|wmf|pict|jpeg|png|dib|gif|tiff|eps|bmp|wpg";
            throw new Exception(err);
        }

        BufferedImage bimg = ImageIO.read(img);
        int w = bimg.getWidth();
        int h = bimg.getHeight();
        double ratio = h*1d/w;

        try  {
            
                int wmax = Integer.parseInt(scale);
                if(w < wmax)  {
                    ;
                } else  {
                    w = wmax;
                    h = (int)Math.round(w*ratio);
                }
            
        }  catch(Exception e)  {
            w = 200;
            h = (int)Math.round(w*ratio);
        }

        //r.addBreak();
        r.addPicture(new FileInputStream(imgFile), format, imgFile, Units.toEMU(w), Units.toEMU(h));
        //r.addBreak(BreakType.PAGE);
    }