poi导出，单元格链接到本地文件?报错

poi导出，单元格设置链接跳转到一个本地文件，代码如下：

XSSFHyperlink link = (XSSFHyperlink) creationHelper.createHyperlink(HyperlinkType.FILE);
//也尝试了file:///..\\lala.jpg加这个前缀的方式
link.setAddress("..\\lala.jpg");

但是发现这样子会一直报错：“Address of hyperlink must be a valid URI”

然后就看了setAddress方法，发现内部有一个校验逻辑如下：

    public void setAddress(String address) {
        validate(address);

       _location = address;
        //we must set location for internal hyperlinks
        if (_type == HyperlinkType.DOCUMENT) {
            setLocation(address);
        }
    }

    @SuppressWarnings("fall-through")
    private void validate(String address) {
        switch (_type) {
            // email, path to file and url must be valid URIs
            case EMAIL:
            case FILE:
            case URL:
                try {
                    new URI(address);
                } catch (URISyntaxException e) {
                    throw new IllegalArgumentException("Address of hyperlink must be a valid URI", e);
                }
                break;
            case DOCUMENT:
                // currently not evaluating anything.
                break;
            default:
                throw new IllegalStateException("Invalid Hyperlink type: " + _type);
        }
    }

那么问题来了。。。假如需要跳转本地文件，这个地址究竟应该怎么写呢~