chore: Spring AI 重构
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abel533
+81
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@@ -14,28 +14,27 @@ You now have expertise in PDF manipulation. Follow these workflows:
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# Using pdftotext (poppler-utils)
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pdftotext input.pdf - # Output to stdout
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pdftotext input.pdf output.txt # Output to file
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# If pdftotext not available, try:
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python3 -c "
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import fitz # PyMuPDF
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doc = fitz.open('input.pdf')
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for page in doc:
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print(page.get_text())
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"
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```
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**Option 2: Page-by-page with metadata**
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```python
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import fitz # pip install pymupdf
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**Option 2: Page-by-page with metadata (Apache PDFBox)**
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```java
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.text.PDFTextStripper;
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import java.io.File;
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doc = fitz.open("input.pdf")
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print(f"Pages: {len(doc)}")
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print(f"Metadata: {doc.metadata}")
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PDDocument doc = PDDocument.load(new File("input.pdf"));
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System.out.println("Pages: " + doc.getNumberOfPages());
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System.out.println("Metadata: " + doc.getDocumentInformation().getTitle());
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for i, page in enumerate(doc):
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text = page.get_text()
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print(f"--- Page {i+1} ---")
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print(text)
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PDFTextStripper stripper = new PDFTextStripper();
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for (int i = 1; i <= doc.getNumberOfPages(); i++) {
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stripper.setStartPage(i);
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stripper.setEndPage(i);
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String text = stripper.getText(doc);
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System.out.println("--- Page " + i + " ---");
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System.out.println(text);
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}
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doc.close();
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```
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## Creating PDFs
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@@ -49,64 +48,91 @@ pandoc input.md -o output.pdf
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pandoc input.md -o output.pdf --pdf-engine=xelatex -V geometry:margin=1in
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```
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**Option 2: Programmatically**
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```python
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from reportlab.lib.pagesizes import letter
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from reportlab.pdfgen import canvas
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**Option 2: Programmatically (Apache PDFBox)**
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```java
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.pdmodel.PDPage;
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import org.apache.pdfbox.pdmodel.PDPageContentStream;
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import org.apache.pdfbox.pdmodel.font.PDType1Font;
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c = canvas.Canvas("output.pdf", pagesize=letter)
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c.drawString(100, 750, "Hello, PDF!")
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c.save()
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PDDocument doc = new PDDocument();
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PDPage page = new PDPage();
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doc.addPage(page);
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try (PDPageContentStream content = new PDPageContentStream(doc, page)) {
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content.beginText();
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content.setFont(PDType1Font.HELVETICA, 12);
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content.newLineAtOffset(100, 750);
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content.showText("Hello, PDF!");
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content.endText();
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}
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doc.save("output.pdf");
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doc.close();
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```
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**Option 3: From HTML**
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```bash
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# Using wkhtmltopdf
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wkhtmltopdf input.html output.pdf
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**Option 3: From HTML (OpenHTMLToPDF)**
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```java
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import com.openhtmltopdf.pdfboxout.PdfRendererBuilder;
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import java.io.FileOutputStream;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.nio.file.Path;
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# Or with Python
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python3 -c "
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import pdfkit
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pdfkit.from_file('input.html', 'output.pdf')
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"
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String html = Files.readString(Path.of("input.html"));
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try (OutputStream os = new FileOutputStream("output.pdf")) {
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PdfRendererBuilder builder = new PdfRendererBuilder();
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builder.withHtmlContent(html, new File("input.html").toURI().toString());
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builder.toStream(os);
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builder.run();
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}
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```
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## Merging PDFs
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```python
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import fitz
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```java
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import org.apache.pdfbox.multipdf.PDFMergerUtility;
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import java.io.File;
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result = fitz.open()
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for pdf_path in ["file1.pdf", "file2.pdf", "file3.pdf"]:
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doc = fitz.open(pdf_path)
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result.insert_pdf(doc)
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result.save("merged.pdf")
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PDFMergerUtility merger = new PDFMergerUtility();
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merger.addSource(new File("file1.pdf"));
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merger.addSource(new File("file2.pdf"));
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merger.addSource(new File("file3.pdf"));
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merger.setDestinationFileName("merged.pdf");
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merger.mergeDocuments(null);
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```
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## Splitting PDFs
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```python
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import fitz
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```java
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import org.apache.pdfbox.multipdf.Splitter;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import java.io.File;
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import java.util.List;
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doc = fitz.open("input.pdf")
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for i in range(len(doc)):
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single = fitz.open()
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single.insert_pdf(doc, from_page=i, to_page=i)
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single.save(f"page_{i+1}.pdf")
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PDDocument doc = PDDocument.load(new File("input.pdf"));
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Splitter splitter = new Splitter();
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splitter.setSplitAtPage(1); // 每页拆分为一个文件
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List<PDDocument> pages = splitter.split(doc);
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for (int i = 0; i < pages.size(); i++) {
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pages.get(i).save("page_" + (i + 1) + ".pdf");
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pages.get(i).close();
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}
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doc.close();
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```
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## Key Libraries
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| Task | Library | Install |
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|------|---------|---------|
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| Read/Write/Merge | PyMuPDF | `pip install pymupdf` |
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| Create from scratch | ReportLab | `pip install reportlab` |
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| HTML to PDF | pdfkit | `pip install pdfkit` + wkhtmltopdf |
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| Task | Library | Maven Dependency |
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|------|---------|-----------------|
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| Read/Write/Merge/Split | Apache PDFBox | `org.apache.pdfbox:pdfbox:3.0.x` |
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| Create from HTML | OpenHTMLToPDF | `com.openhtmltopdf:openhtmltopdf-pdfbox:1.0.x` |
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| Advanced layout | iText | `com.itextpdf:itext7-core:8.0.x` |
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| Text extraction | pdftotext | `brew install poppler` / `apt install poppler-utils` |
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## Best Practices
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1. **Always check if tools are installed** before using them
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2. **Handle encoding issues** - PDFs may contain various character encodings
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3. **Large PDFs**: Process page by page to avoid memory issues
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4. **OCR for scanned PDFs**: Use `pytesseract` if text extraction returns empty
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3. **Large PDFs**: Process page by page to avoid memory issues; use try-with-resources 确保资源释放
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4. **OCR for scanned PDFs**: Use Tesseract4J (`net.sourceforge.tess4j:tess4j`) if text extraction returns empty
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