javafx开发- ImageView标签设置图片不显示

古城微笑少年丶 2023-10-10 22:46 54阅读 0赞

> 图片不显示的原因没找到, 但是找到了解决办法 嘿嘿…

### 解决问题代码如下: ###

/**
         * @Title: GetImageStrFromPath
         * @Description: TODO(将一张本地图片转化成Base64字符串)
         * @param imgPath
         * @return
         */
        public static String GetImageStrFromPath(String imgPath) {
        
            InputStream in = null;
            byte[] data = null;
            // 读取图片字节数组
            try {
        
                in = new FileInputStream(imgPath);
                data = new byte[in.available()];
                in.read(data);
                in.close();
            } catch (IOException e) {
        
                e.printStackTrace();
            }
            // 对字节数组Base64编码
            BASE64Encoder encoder = new BASE64Encoder();
            // 返回Base64编码过的字节数组字符串, 在win环境中会自动换行, 因此需要把换行符给去掉
            return encoder.encode(data).replaceAll("\r\n","");
        }

@FXML
    public ImageView yj_img;
    
    
    @SneakyThrows
        @Override
        public void initialize(URL location, ResourceBundle resources) {
        
    
    /** 这段的功能是实时时间的显示 */
            //设置实时时间
            SimpleDateFormat currentTime = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");	//设置时间格式
    
            EventHandler<ActionEvent> eventHandler = e->{
        
                sj_La.setText(currentTime.format(new Date()));
    //            System.out.println(currentTime.format(new Date()));
            };
            //一秒刷新一次
            Timeline animation = new Timeline(new KeyFrame(Duration.millis(1000), (javafx.event.EventHandler<ActionEvent>) eventHandler));
            animation.setCycleCount(Timeline.INDEFINITE);
            animation.play();
    
    /** 这段的功能是实时时间的显示 */
    
            /**
             * 将图片转为base64字符串,然后放到ImageView标签中就可以显示了
             */
            URL resource = getClass().getResource("/image/yj_gray.png");
            String imgPath = resource.toURI().getPath().trim();
    //        System.out.println(imgPath);
            String base64Str = Base64ImgUtil.GetImageStrFromPath(imgPath);
    //        System.out.println("64格式:--" + base64Str + "---" + base64Str.length());
    //        String base64String = "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAYVJREFUOE/Nk89LAlEQx2d2N3+EYqduQZeOEUFRCUUrbkS6KlR2ic5dvUbdqmuXDh06RgczUFcjWnPDwrpFdOw/6JQlKLr7JjQVF/IHdGlOj5nv+/CdN28Q/hjY7X48qUZq9VBAOuqk6w5QMtE6QPaGewLiaTXCMz4ry56Xpjh5pc7WzoEV6amZU5TshMEZnpDvx1XdgaZpQqGoXwPBuEWojulk9RHRNhFM1kUIzwzZiRX1dEUfeAOEV5dDWBZFUW+1EM3n7baP0iIz2CYAbCBClDG8RaTTNvvnHM+dlYfsd2G3u9Ry0BQkFHWXAHc4MvxOpyX3WarOkIEP7f0jwF5QlvabuZYDTdNshaL+DhwcVgaFY2tRzxLA9C+P9+VyCMOiKJZNDuKpzDwQ5Sy8MFJh1S0gPOg4YsSFkN97bwIk0+oqYxADwBggTAHRaCcAx8FawCddmgCJ1M06Edbn3isQKRz0L138M0BcUfMAMNfLfqP+GJIlt3kKjX/fJ6C1H12XqR/YN1DkmhHCB7aNAAAAAElFTkSuQmCC";
    //        System.out.println(base64String.length());
            byte[] imageBytes = Base64.getDecoder().decode(base64Str);
            InputStream inputStream = new ByteArrayInputStream(imageBytes);
            DataInputStream dataInputStream = new DataInputStream(inputStream);
            yj_img.setImage(new Image(dataInputStream));
    
            /**
             * 状态!=就绪, 按钮不可点击
             */
            startTest_btu.setDisable(true);
    
    
        }