下载文件

public void downloadFile(HTTPContext context) throws IOException {
        String fileId = context.getParameter("fileId");
        SEntity sFile = new SEntity("VIEW_OA_DEPT_DOCUMENT");
        sFile.addCondition("ID=?", fileId);
        baseDao.load(sFile);
        //查询对应的附件
        String doc_id=sFile.getValueAsString("DOC_ID");
        SEntity entity=new SEntity("sys_upload_file");
        entity.addCondition("ID=?", doc_id);
        baseDao.load(entity);
        context.response.setCharacterEncoding("utf-8");
        context.response.setHeader("Cache-control", "no-cache");
        context.response.setHeader("Content-Disposition", "attachment; filename=" +new String(sFile.getValueAsString("FILENAME").getBytes(),"ISO8859-1")); 
        Blob blob = entity.getValueAsBLOB("CONTENT");
        try {
            InputStream input = blob.getBinaryStream();
            IOUtils.copy(input, context.response.getOutputStream());
            IOUtils.closeQuietly(input);
        } catch (SQLException e) {
            e.printStackTrace();
        } 
    }