Java中文件下载的代码

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Java中文件下载的代码，记载下来方便使用：

/** * 下载文件 */public void downFile(){HttpServletResponse response = this.getResponse();try {// 清空responseresponse.reset();//设置输出的格式response.setContentType("application/x-download");// 设置为下载application/x-download response.addHeader("content-type ","application/x-msdownload"); response.setContentType("application/octet-stream");response.setHeader("content-disposition", "attachment; filename="+ transCharacter(this.getRequest(), "文件名称"));//设定输出文件头response.addHeader("Content-Length", "1024");// 以流的形式下载文件。InputStream fis = new BufferedInputStream(new FileInputStream("c:/input/a.doc"));ServletOutputStream toClient = response.getOutputStream();byte[] buffer = new byte[1024];int n = 0;while ((n = fis.read(buffer))!=-1) {toClient.write(buffer,0,n);toClient.flush();}fis.close();//输出文件toClient.close();} catch (Exception ex) {ex.printStackTrace();}}/** * 根据不同的浏览器转字符编码 * @param request * @param str * @return * @throws Exception */private String transCharacter(HttpServletRequest request, String str) throws Exception{if(request.getHeader("USER-AGENT").toLowerCase().indexOf( "msie" ) > 0){return URLEncoder.encode(str, "UTF-8");}else if(request.getHeader("USER-AGENT").toLowerCase().indexOf( "firefox" ) > 0){return new String(str.getBytes("UTF-8"), "ISO8859-1");}return new String(str.getBytes("UTF-8"), "ISO8859-1");}