发送PDF文件

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);

}

}

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