将 JTextPane 的内容输出为图片

最新推荐文章于 2021-02-18 18:56:59 发布

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最新推荐文章于 2021-02-18 18:56:59 发布

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文章标签： java

本文介绍了一个使用Java实现的截图工具类ImageOutput，该工具能够将JTextPane组件的内容按页面输出为JPG格式的图片文件。文章详细展示了如何通过Graphics2D进行绘制，并处理了分页逻辑，确保可以完整地输出长文档。

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import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax.imageio.ImageIO; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JTextPane; import javax.swing.plaf.basic.BasicEditorPaneUI; /** * ImageOutput.java * Created on May 14, 2011, 7:53:17 PM * Copyright (c) 2007-2011. The CUCKOO Workgroup, P.R.China * @author Ren Jian * @version 4.1 */ class ImageOutput { private JTextPane panel; ImageOutput(JTextPane panel) { this.panel = panel; } void output(String outputFile) { int width = panel.getWidth(); int height = panel.getHeight(); int pageIndex = 1; boolean isContinue = true; while (isContinue) { try { BufferedImage image = new java.awt.image.BufferedImage(width, height, java.awt.image.BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); g.setClip(0, 0, width, height); isContinue = paint(g, height, pageIndex); g.dispose(); ImageIO.write(image, "JPG", new File(outputFile)); pageIndex++; } catch (IOException ex) { Logger.getLogger(ImageOutput.class.getName()).log(Level.SEVERE, null, ex); } } } boolean paint(Graphics g, int height, int pageIndex) { Graphics2D g2d = (Graphics2D) g; Dimension d = ((BasicEditorPaneUI) panel.getUI()).getPreferredSize(panel); double panelHeight = d.height; double pageHeight = height; int totalNumPages = (int) Math.ceil(panelHeight / pageHeight); g2d.translate(0f, -(pageIndex - 1) * pageHeight); panel.paint(g2d); boolean ret = true; if (pageIndex >= totalNumPages) { ret = false; return ret; } return ret; } }