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jsf 另存为的实现

 

public String btnSaveXML_action() {
        // TODO: Process the action. Return value is a navigation
        // case name where null will return to the same page.
        try {
            //get the appId
            Integer appId = Integer.valueOf(txtMemory1.getText().toString());
            String appName = datamanagementservice.getAppNameByAppId(appId);
            Document doc = writeXML(appId, appName);
            TransformerFactory tFactory = TransformerFactory.newInstance();
            Transformer transformer = tFactory.newTransformer();
            DOMSource source = new DOMSource(doc);

            //the file's loadpath
            String loadPath = "c:\\temp\\" + appName + ".xml";
            //if the file no exist then create it
            File f = new File("c:\\temp\\");
            f.mkdirs();
            StreamResult result = new StreamResult(new java.io.File(loadPath));
            transformer.transform(source, result);

            //new a download file
            File t_file = new File(loadPath);
            long l;
            for (l = 0L; l == 0L; l = t_file.length()) {

                t_file = new File(loadPath);
            }
            InputStream in = new FileInputStream(t_file);
            if (in != null) {
                String filename = t_file.getName();
                filename = java.net.URLEncoder.encode(filename, "utf-8");

                FacesContext.getCurrentInstance().responseComplete();
                HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
                httpServletResponse.reset();
                httpServletResponse.setContentType("application/x-msdownload");
                String rrr = "attachment; filename=" + filename;
                httpServletResponse.setHeader("Content-Disposition", rrr);
                httpServletResponse.setContentLength((int) l);

                byte b[] = new byte[2048];
                for (int len = 0; (len = in.read(b)) > 0;) {
                    httpServletResponse.getOutputStream().write(b, 0, len);
                }
                in.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        getRequestBean1().setSelectAppId((Integer) dropDown1.getSelected());

        return null;
    }
posted on 2008-11-27 10:39 Vincent-chen 阅读(249) 评论(0)  编辑  收藏 所属分类: JSF

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