filedownloadservlet.java

实现办公自动化系统

package com.oa.struts.document.servlet;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;

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

public class FileDownloadServlet extends HttpServlet {

    /**
     * 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 {
        doPost(request, response);
    }

    /**
     * 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 {
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
        	//request.setCharacterEncoding("");
        	
            String filename = request.getParameter("filename");
           // System.out.println("=====" + new String(filename.getBytes("ISO-8859-1"), "gb2312"));
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-disposition", "attachment; filename="
            		+ new String(filename.getBytes("gb2312"), "ISO-8859-1"));
            bis = new BufferedInputStream(new FileInputStream(
                    getServletContext().getRealPath("ImagesUploaded/" + filename)));
            bos = new BufferedOutputStream(response.getOutputStream());
            byte[] buff = new byte[2048];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
        } catch (Exception e) {
            throw new ServletException("文件下载出错!"+e.getMessage());
        } finally {
            if (bis != null)
                bis.close();
            if (bos != null)
                bos.close();
        }
    }

}