java代码删除PDF文件中的斜体水印
时间: 2023-10-29 22:04:22 浏览: 51
删除PDF文件中的斜体水印需要使用PDFBox库来解析PDF文件并处理水印。以下是Java代码示例:
```java
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
import org.apache.pdfbox.pdmodel.graphics.state.PDGraphicsState;
import org.apache.pdfbox.pdmodel.graphics.state.RenderingMode;
public class RemoveItalicWatermark {
public static void main(String[] args) throws IOException {
// Load PDF document
File pdfFile = new File("input.pdf");
PDDocument document = PDDocument.load(pdfFile);
// Iterate over each page
for (PDPage page : document.getPages()) {
PDGraphicsState graphicsState = page.getGraphicsState();
PDExtendedGraphicsState extendedGraphicsState = graphicsState.getNonStrokingAlphaConstant();
RenderingMode renderingMode = graphicsState.getTextState().getRenderingMode();
// Check if page has italic watermark
if (extendedGraphicsState != null && extendedGraphicsState.getStrokingAlphaConstant() == 0
&& renderingMode == RenderingMode.FILL_STROKE_TEXT && graphicsState.getTextState().getFont().isItalic()) {
// Remove watermark by resizing page and redrawing content
PDRectangle mediaBox = page.getMediaBox();
float x = mediaBox.getLowerLeftX();
float y = mediaBox.getLowerLeftY();
float width = mediaBox.getWidth();
float height = mediaBox.getHeight();
page.setMediaBox(new PDRectangle(x, y, width + 1, height + 1));
page.setCropBox(mediaBox);
page.getResources().getCachedFonts().clear();
page.getResources().getFonts().clear();
page.getResources().getXObjects().clear();
page.getResources().getShadings().clear();
page.getResources().getExtGStateNames().clear();
page.getResources().getColorSpaceNames().clear();
page.getResources().getPatternNames().clear();
page.getResources().getProperties().clear();
page.getResources().getProcSet().clear();
page.getResources().getProperties().clear();
page.getResources().getShadingNames().clear();
page.getContents().clear();
}
}
// Save modified document
document.save("output.pdf");
document.close();
}
}
```
这段代码会遍历PDF文件中的每一页,检查是否有斜体水印。如果有,它会通过重新设置页面大小和清除页面内容来删除水印。最后,它会将修改后的文档保存到指定的输出文件中。请注意,这段代码仅适用于PDFBox版本2.0以上。