struts 中实现文件的上传

------------文件上传

java 代码

public class UploadFile {
    public static String upLoad(FormFile file,String uploadDir,String newName) throws FileNotFoundException, IOException{
        String data = null;
        String location = null;
        String totalname;
        String extend;
        StringBuffer fileName;
        String contentType;
        String size;

        int i;
        File dirPath;
        InputStream inputStream;
        OutputStream outputStream;

        //得到上传文件的全名,包括扩展名
        totalname = file.getFileName();
         //得到扩展名
        i = totalname.lastIndexOf(".");

         //如果没有上传图片，则返回空
         if(i==-1){
            return location;
         }

         extend = totalname.substring(i);
         //重命名该文件
         fileName = new StringBuffer(newName + extend);
         fileName.toString();

        //得到文件类型
        contentType = file.getContentType();
        //得到文件大小
        size = (file.getFileSize() + " bytes");

        dirPath = new File(uploadDir);
        if (!dirPath.exists()) {
            dirPath.mkdirs();
        }

        inputStream = file.getInputStream();
        outputStream = new FileOutputStream(uploadDir + fileName);
        int bytesRead = 0;
        byte[] buffer = new byte[8192];

        while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }

        location = dirPath.getAbsolutePath()
            + System.getProperty("file.separator") + fileName + "\"";

        outputStream.close();
        inputStream.close();
        file.destroy();

        return location;
    }
}

 

--------------------文件的下载

java 代码

public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  String strFileName = "测试文件.rar";
  File file = new File("具体路径" + strFileName);//
  if(file.exists()){
   try{
    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
    byte[] buffer = new byte[1024];
    strFileName = java.net.URLEncoder.encode(strFileName, "UTF-8");//处理中文文件名的问题
    strFileName = new String(strFileName.getBytes("UTF-8"),"GBK");//处理中文文件名的问题
    response.reset();
    response.setCharacterEncoding("UTF-8");
    response.setContentType("application/x-rar-compressed");//不同类型的文件对应不同的MIME类型
    response.setHeader("Content-Disposition","attachment; filename=" + strFileName);
    OutputStream os = response.getOutputStream();
    while(bis.read(buffer) > 0){
     os.write(buffer);
    }
    bis.close();
    os.close();
   }
   catch(Exception e){
    ......
   }
  }
  return mapping.getInputForward();
 }