文件下载

小咪咪 2022-04-16 03:08 267阅读 0赞

支持多种不同文件格式下载：

logger.info("\*\*\*\*\*下载文件开始\*\*\*\*\*");

/\*拼接下载文件\*/  
            String fileName = request.getParameter("filename");  
            this.createLog(request, "用户下载文件" + fileName, null);//记录日志  
             
            String path = request.getSession().getServletContext().getRealPath("/") + "msi" + "\\\\" + fileName;  
             
            File file = new File(path);  
             
   response.reset(); /\*清除缓存的中的内容\*/  
   response.setContentType("application/x-download");/\*设置请求响应的类型\*/  
            try \{  
       /\*设置解析编码\*/  
       response.setCharacterEncoding("gb2312");  
       request.setCharacterEncoding("gb2312");  
                 
                /\*解决中文文件名乱码问题\*/  
    response.addHeader("Content-Disposition","attachment;fileName="+ URLEncoder.encode(fileName, "UTF-8"));  
   \} catch (UnsupportedEncodingException e) \{  
    logger.error("设置请求响应编码异常!");  
    e.printStackTrace();  
   \}  
            response.addHeader("Content-Length", new Long(file.length()).toString());  
             
         /\*文件下载的输入和输出流\*/  
   InputStream is = null;  
            OutputStream os = null;   
            try\{    
             if(file.exists())\{  
              /\*初始化一个输出流\*/  
              os = response.getOutputStream();  
                 is = new FileInputStream(file);  
            
              /\*文件是否读取结束标志\*/  
              int i = -1;  
    
              byte\[\]  b = new byte\[1024\];/\*定义输入输出之间的缓存\*/  
               
              /\*第一次读取服务器上的文件\*/  
              i = is.read(b);  
              while(i != -1)\{  
                  os.write(b,0, i);  
               i = is.read(b);  
              \}  
             \}else\{//若文件不存在  
              String info = "所下载的文件,系统没找到!!";  
              request.setAttribute("info", info);  
                    return "platform/downError";  
             \}  
         \}catch (IOException  ex) \{  
          logger.error("读取文件" + fileName + "异常");  
   \}finally \{  
    try \{  
     if(null != is) \{  
      is.close();  
     \}  
     if(null != os) \{  
      os.flush();  
      os.close();  
     \}   
    \} catch (IOException e) \{  
    \}  
   \}  
     
        logger.info("\*\*\*\*\*下载文件结束\*\*\*\*\*");  
     return null;