运行下面Serlet代码,怎么显示不出来？请专家们解答。

import java.io.PrintWriter;
import java.io.IOException;
import java.io.File;

import java.util.Date;

import javax.servlet.http.*;
import javax.servlet.*;

import com.lowagie.text.*;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.html.HtmlWriter;

public class Chap0105_1 extends HttpServlet {

    public void doGet (HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException {

        Document document = new Document();
        try {
                 response.setContentType("application/pdf");
                response.setHeader("Content-disposition","inline;filename="Example.pdf"");
 
                PdfWriter.getInstance(document, response.getOutputStream());


            // step 3
            document.open();

            // step 4
            document.add(new Paragraph(new Date().toString()));
            document.add(new Paragraph("Hello World"));
        }
        catch(DocumentException de) {
            de.printStackTrace();
            System.err.println("document: " + de.getMessage());
        }

        // step 5: we close the document (the outputstream is also closed internally)
        document.close();
    }
}

Document document = new Document();//创建一Document对象
ByteArrayOutputStream baos = new ByteArrayOutputStream();//
PdfWriter.getInstance(document, baos);
document.open();
document.add(new Phrase("你好世界"));
document.close();
response.setContentType("application/pdf");
response.setContentLength(baos.size());
ServletOutputStream pout = response.getOutputStream();
baos.writeTo(pout);
pout.flush();