如何将Java代码嵌入到jython脚本中。

Question

我制作了这个beanShell脚本，该脚本通过按按钮来增加屏幕截图，现在试图弄清楚如何在Jython中使用Java来获取实际的屏幕截图（因为它是跨平台的）。

我的表现不是很好，并且想知道是否有人可以向我展示如何将Java部分插入Jython部分（我已经安装了gui和event －见下文）？

这是Java部分...

Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();
Robot robot = new Robot();
Rectangle rect = new Rectangle(0, 0, scr.width, scr.height);
BufferedImage image = robot.createScreenCapture(rect);
ImageIO.write(image, "jpeg", new File("Captured" + c + ".jpg"));

这是整个beanShell脚本

import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;  
import java.io.File;
import java.io.IOException;

int c = 0; // image counter

buttonHandler = new ActionListener() {
  actionPerformed( this ) {

  Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();

  // Allocate a Robot instance, and do a screen capture
  Robot robot = new Robot();
  Rectangle rect = new Rectangle(0, 0, scr.width, scr.height);
  BufferedImage image = robot.createScreenCapture(rect);

  // Save the captured image to file with ImageIO (JDK 1.4)
  ImageIO.write(image, "jpeg", new File("Captured" + c + ".jpg"));
  c++; 
  }
};

button = new JButton("Click to save incrementing screenshots to this app's location");
button.addActionListener( buttonHandler );
// JLabel label1 = new JLabel("hello");
frame(button);

这是我到目前为止拥有的Jython脚本...

from javax.swing import JButton, JFrame
from java.awt import Toolkit
from java.awt.event import KeyEvent;
from java.awt.image import BufferedImage;
from javax.imageio import ImageIO;    
from java.io import File, IOException

c = 0 

frame = JFrame(
    'App Title', 
    defaultCloseOperation = JFrame.EXIT_ON_CLOSE, 
    size = (450, 60)
)


def change_text(event):
    global c
    ...
    // Java part
    ...
    c = c + 1


button = JButton(
    "Click to save incrementing screenshots to this app's location",
    actionPerformed=change_text
)

frame.add(button)
frame.visible = True

谢谢 ：）

Answer 1

将这段Java代码片段包装在公共Java类中：

package com.mycompany;
public class ScreenshotEngine {
  public void takeScreenshot(String filename) {
    // Code that actually takes the screenshot and saves it to a file
  }
}

记住要对其进行编译，并使其在应用程序的类路径中可用。

然后，可以从jython脚本中像使用其他任何Java类一样使用它。

# Using the fully qualified name of the class
engine = com.mycompany.ScreenshotEngine()
engine.takeScreenshot('/tmp/sc1.png')

# You can also use import to shorten class names
from com.mycompany import ScreenshotEngine
engine = ScreenshotEngine()
engine.takeScreenshot('/tmp/sc2.png')

您知道在上面的代码片段中如何使用JDK中的JButton和JFrame吗？ 那是同一回事。