使用java将返回值为pdf数据流的信息处理为可读的pdf文件

可以使用Java的PDFBox库来处理返回值为PDF数据流的信息，将其转换为可读的PDF文件。以下为一段示例代码：

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;

public class PDFHandler {
  public static void main(String[] args) throws IOException {
    byte[] pdfStream = getPDFStream(); // 获取返回值为PDF数据流的信息
    PDDocument document = PDDocument.load(new ByteArrayInputStream(pdfStream));
    // 创建一个新的PDF页面
    PDPage page = new PDPage();
    document.addPage(page);
    // 在页面上添加文字
    PDPageContentStream contentStream = new PDPageContentStream(document, page);
    contentStream.beginText();
    contentStream.setFont(PDType1Font.TIMES_ROMAN, 12);
    contentStream.newLineAtOffset(100, 700);
    contentStream.showText("Hello, PDFBox!");
    contentStream.endText();
    contentStream.close();
    // 保存PDF文件
    document.save(new File("output.pdf"));
    document.close();
  }

  // 模拟获取返回值为PDF数据流的信息
  private static byte[] getPDFStream() {
    return new byte[] { 37, 80, 68, 70, 45, 49, 46, 52, 10, 37, 227, 228, 205, 222, 10, 49, 32, 48, 32, 111, 98,
        106, 10, 60, 60, 10, 47, 84, 121, 112, 101, 32, 47, 70, 111, 110, 116, 10, 47, 83, 117, 98, 116, 121, 112,
        101, 32, 47, 84, 121, 112, 101, 49, 10, 47, 66, 97, 115, 101, 70, 111, 110, 116, 32, 47, 84, 105, 109, 101,
        115, 45, 82, 111, 109, 97, 110, 10, 47, 69, 110, 99, 111, 100, 105, 110, 103, 32, 47, 87, 105, 110, 65, 110,
        115, 105, 69, 110, 99, 111, 100, 105, 110, 103, 10, 62, 62, 10 };
  }
}