Servlet发送pdf文件

文件	MIME类型	扩展名
XML	text/xml	.xml
HTML	text/html	.html
纯文本	text/plain	.txt
PDF	application/pdf	.pdf
GIF图片	image/gif	.gif
JPEG	image/jpeg	.jpeg
PNG	image/x-png	.png
mp3	audio/mpeg	.mp3
ShockwaveFlash动画	application/futuresplashaa或application/x-shockwave-flash	.swf
word	application/msword	.doc
Excel	application/vnd.ms-excel	.xls
PowerPoint	application/vnd.ms-powerpoint	.ppt

发送pdf文件
访问URL为http://localhost:8080/success/sendpdf?file=filename

package myServlet;

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

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 sendpdf extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public sendpdf() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String filename=(String)request.getParameter("file");
		if(filename==""||filename==null)
		{
			throw new ServletException("invalid filename");
		}
		if(filename.indexOf(".pdf")==-1)
		{
			filename=filename+".pdf";
		}
		
		//pdf保存在何处
		String pdfDir=getServletContext().getInitParameter("pdf_dir");
		if(pdfDir.equals("")||pdfDir==null)
		{
			throw new ServletException("invlid pdfDir");
		}
		
		ServletOutputStream stream=null;
		BufferedInputStream input=null;
		
		try
		{
			stream=response.getOutputStream();
			File file=new File(pdfDir+"/"+filename);
			
			response.setContentType("application/pdf");
			response.addHeader("Content-Disposition", "attachment;filename="+filename);
			
			response.setContentLength((int) file.length());
			
			FileInputStream finput=new FileInputStream(file);
			input=new BufferedInputStream(finput);
			int readBytes=0;
			while((readBytes=input.read())!=-1)
			{
				stream.write(readBytes);
			}
		}
		catch(Exception e)
		{
			System.out.println(e.toString());
		}
		finally
		{
			if(stream!=null)
			{
				stream.close();
			}
			if(input!=null)
			{
				input.close();
			}
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}

web.xml

<context-param>
    <param-name>pdf_dir</param-name>
    <param-value>e:/test</param-value>
</context-param>

Content-Disposition首部域指示客户端将接收的数据作为附件，而不是作为字符显示在浏览器中。