问从已处理的JSP中用XHTML生成PDF

EN

import org.xhtmlrenderer.pdf.ITextRenderer;
import com.lowagie.text.DocumentException;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Scanner;

/**
 * PdfConverter
 * Pdf methods to convert Jsp from URI, or Xhtml/Xml from URI 
 * or internal content to Pdf.
 */
public class PdfConverter {

    private static String encoding = "UTF-8";

    /**
     * Convert JSP from local server to PDF
     * @param jspUri usage :
     *    URL jspUri = 
     *        new URL("http://localhost:8080/myApp/myJspServlet?param1=1&param2=2");
     * @param pdfFileName
     * @return Html content as a String from generated Jsp.
     * @throws DocumentException
     * @throws IOException
     */
    public static String JspToHtmlString(URL jspUri) throws DocumentException, 
                                                            IOException {
        BufferedReader in = new BufferedReader(
            new InputStreamReader(jspUri.openStream())
        );
        CharArrayWriter caw = new CharArrayWriter();
        int octet = 0;
        while ((octet = in.read()) != -1) { caw.write(octet); }
        String pdfContent = caw.toString();
        caw.close();
        return pdfContent;
    }

    /**
     * Convert Xhtml from package to PDF to the folder where this class is 
     * located.
     * @param xhtmlFileName name of the Xhtml file inside the application.
     * @param pdfFileName name of the written Pdf file.
     * @return Pdf file generated and written on disk.
     * @throws DocumentException
     * @throws IOException
     */
    public static File XhtmlToPdfConverter( String xhtmlFileName, 
                                            String pdfFileName) throws
                                                             DocumentException,
                                                             IOException {
        FileOutputStream pdf = new FileOutputStream(pdfFileName);
        new ITextRenderer() {{
            setDocumentFromString(
                new Scanner(
                    this.getClass().getResourceAsStream(xhtmlFileName), encoding
                ).useDelimiter("\\A").next()
            );
            layout();
            createPDF(pdf);
        }};
        pdf.close();
        return new File(pdfFileName);
    }
}