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將 javafx 圖像轉換為/從 base64

[英]Converting javafx image to/from base64

我正在嘗試將項目數據(圖像、參數等)保存在保存文件中。 我發現的方法是將所有數據合並到 XML 文件中,所以我決定將圖像轉換為 Base64 字符串。 這里的障礙是我不知道如何從字符串中獲取圖像。

File file = new File("image_path");
byte[] bytes = new byte[(int)file.length()];
FileInputStream fis = new FileInputStream(file);
fis.read(bytes); 
fis.close();
String ef = Base64.getEncoder().encodeToString(bytes);
Image image = new Image(file.toURI().toString());

當我嘗試在同一個函數中使用解碼器時,它總是打印錯誤。

byte[] ds = Base64.getDecoder().decode(ef);
if(ds==bytes) {
    System.out.println("True");
}else {
    System.out.println("false");
}

我在網站上找到的所有示例都已過時。 那么在不丟失數據的情況下將字符串轉換回文件的正確方法是什么。 提前致謝。

Path path = Paths.get("...");
byte[] bytes = Files.readAllBytes(path);

接着

byte[] img = Base64.getDecoder().decode(bytes);

或者更好的內存使用:

 InputStream in = Base64.getDecoder().wrap(Files.newInputStream(path));
 Image image = new Image(in);

一個問題是歷史上有幾個 Base64 類,您需要java.util.Base64

JavaFX 可以直接為圖像解碼正確編碼的 base64 數據 URL。

Image javadoc 討論了這個:

除了為應用程序注冊的協議處理程序之外,還支持用於 URL 的 RFC 2397“數據”方案。 如果 URL 使用“數據”方案,則數據必須是 base64 編碼的,並且 MIME 類型必須為空或圖像類型的子類型。

示例應用

圖片

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;

public class ImageDataDecodeApp extends Application {

    private static final String ROCKET_IMAGE =
            "data:image/png;base64," +
            "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";

    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(
                new Scene(
                        new Group(
                                new ImageView(
                                        ROCKET_IMAGE
                                )
                        )
                )
        );

        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

FXML 和 CSS 中的 Base64 編碼圖像

base64 編碼圖像也可以直接添加到 FXML 中(我猜 CSS 也是如此,雖然我沒有嘗試過)。

如需在 FXML 中嵌入 base64 編碼圖像,請參閱:

以 Base64 格式保存 JavaFX 圖像

此答案中有用於將 JavaFX 圖像轉換為 base64 格式的示例代碼:

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