javafx开发- ImageView标签设置图片不显示-蒲公英云

javafx开发- ImageView标签设置图片不显示

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:

<ImageView fx:id="yj_img" fitHeight="16.0" fitWidth="16.0" layoutX="573.0" layoutY="8.0" pickOnBounds="true" preserveRatio="true">
               <image>
                  <Image url="@../image/yj_green.png" />
               </image>
</ImageView>
/**
     * @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 = "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";
//        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);
    }