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发送PDF文件

 2007-12-23 12:35:53 来源:WEB开发网   
核心提示:import java.io.BufferedInputStream;import java.io.IOException;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import jav
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UrlServlet extends HttpServlet {

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

  //get the 'file' parameter
  String fileName = (String) request.getParameter("file");
  if (fileName == null  fileName.equals(""))
   throw new ServletException(
     "Invalid or non-existent file parameter in UrlServlet servlet.");

  if (fileName.indexOf(".pdf") == -1)
   fileName = fileName + ".pdf";

  URL pdfDir = null;
  URLConnection urlConn = null;
  ServletOutputStream stream = null;
  BufferedInputStream buf = null;
  try {

   pdfDir = new URL(getServletContext().getInitParameter(
     "remote-pdf-dir")
     + fileName);

  } catch (MalformedURLException mue) {

   throw new ServletException(mue.getMessage());
  }
  try {

   stream = response.getOutputStream();

   //set response headers
   response.setContentType("application/pdf");
   response.addHeader("Content-Disposition", "attachment; filename="
     + fileName);

   urlConn = pdfDir.openConnection();
   response.setContentLength((int) urlConn.getContentLength());

   buf = new BufferedInputStream(urlConn.getInputStream());
   int readBytes = 0;

   //read from the file; write to the ServletOutputStream
   while ((readBytes = buf.read()) != -1)
    stream.write(readBytes);
  } catch (IOException ioe) {
   throw new ServletException(ioe.getMessage());
  } finally {
   if (stream != null)
    stream.close();
   if (buf != null)
    buf.close();
  }
 }

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

  doGet(request, response);
 }
}

(出处:http://www.cncms.com)


Tags:发送 PDF 文件

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