struts实现的图片的上传和下载

   

    
    

    public
     
    class
     FileAction 
    extends
     DispatchAction {

    
    private
     JDBConnection connection 
    =
    new
     JDBConnection();

    //
    以下方法实现文件的上传
    

        
    public
     ActionForward upLoadFile(ActionMapping mapping, ActionForm form,
                                    HttpServletRequest request,
                                    HttpServletResponse response) 
    throws
    
            Exception {
        Date date 
    =
     
    new
     Date();
        FileActionForm fileActionForm 
    =
     (FileActionForm) form;
        FormFile file 
    =
     fileActionForm.getFile(); 
    //
    获取当前的文件
    

            String dir 
    =
     servlet.getServletContext().getRealPath(
    "
    /image
    "
    );
        String path 
    =
     upload(dir, file); 
    //
    实现文件的上传的功能,并且返回上传服务器的路径
    

            path
    =
    "
    image/
    "
    +
    path;
        String fileName 
    =
     Chinese.toChinese(fileActionForm.getFileName()); 
    //
    获取文件的名称
    

            String fileSize 
    =
     String.valueOf(file.getFileSize());
        String fileDate 
    =
     DateFormat.getDateInstance().format(date);
        String sql 
    =
     
    "
    insert into tb_file values('
    "
     
    +
     fileName 
    +
     
    "
    ','
    "
     
    +
    
                     fileSize 
    +
     
    "
    ','
    "
     
    +
     fileDate 
    +
     
    "
    ','
    "
     
    +
     path 
    +
     
    "
    ')
    "
    ;
        connection.executeUpdate(sql);
        connection.closeConnection();
        
    return
     mapping.findForward(
    "
    upLoadFileResult
    "
    );
    }

    
    public
     String upload(String dir, FormFile formFile) 
    throws
     Exception {
         Date date 
    =
     
    new
     Date();
        
    //
    取欲上传的文件的名字和长度
    

            String fname 
    =
     formFile.getFileName();
        
    //
    将上传时间加入文件名
    

            
    int
     i 
    =
     fname.indexOf(
    "
    .
    "
    );
        String name 
    =
     String.valueOf(date.getTime());
        String type 
    =
     fname.substring(i 
    +
     
    1
    );
        fname 
    =
     name 
    +
     
    "
    .
    "
     
    +
     type;
        InputStream streamIn 
    =
     formFile.getInputStream();    
    //
    创建读取用户上传文件的对象
    

            File uploadFile 
    =
     
    new
     File(dir);   
    //
    创建把上传数据写到目标文件的对象
    

            
    if
     (
    !
    uploadFile.exists() 
    ||
     uploadFile 
    ==
     
    null
    ) {  
    //
    判断指定路径是否存在，不存在则创建路径
    

                uploadFile.mkdirs();
        }
        String path 
    =
     uploadFile.getPath() 
    +
     
    "
    /
    "
     
    +
     fname;
        OutputStream streamOut 
    =
     
    new
     FileOutputStream(path);
        
    int
     bytesRead 
    =
     
    0
    ;
        
    byte
    [] buffer 
    =
     
    new
     
    byte
    [
    8192
    ];
        
    while
     ((bytesRead 
    =
     streamIn.read(buffer, 
    0
    , 
    8192
    )) 
    !=
     
    -
    1
    ) {
            streamOut.write(buffer, 
    0
    , bytesRead);
        }
        streamOut.close();
        streamIn.close();
        formFile.destroy();
        
    return
     fname;
    }


    
    //
    实现文件的下载
    

        
    public
     ActionForward downFile(ActionMapping mapping, ActionForm form,
                                  HttpServletRequest request,
                                  HttpServletResponse response) 
    throws
    
            Exception {
        String path 
    =
     request.getParameter(
    "
    path
    "
    );
        BufferedInputStream bis 
    =
     
    null
    ;
        BufferedOutputStream bos 
    =
     
    null
    ;
        OutputStream fos 
    =
     
    null
    ;
        InputStream fis 
    =
     
    null
    ;
        String filepath 
    =
     servlet.getServletContext().getRealPath(
    "
    /
    "
     
    +
     path);
        File uploadFile 
    =
     
    new
     File(filepath);
        fis 
    =
     
    new
     FileInputStream(uploadFile);
        bis 
    =
     
    new
     BufferedInputStream(fis);
        fos 
    =
     response.getOutputStream();
        bos 
    =
     
    new
     BufferedOutputStream(fos);
        response.setHeader(
    "
    Content-disposition
    "
    ,
                           
    "
    attachment;filename=
    "
     
    +
    
                           URLEncoder.encode(path, 
    "
    utf-8
    "
    ));
        
    int
     bytesRead 
    =
     
    0
    ;
        
    byte
    [] buffer 
    =
     
    new
     
    byte
    [
    8192
    ];
        
    while
     ((bytesRead 
    =
     bis.read(buffer, 
    0
    , 
    8192
    )) 
    !=
     
    -
    1
    ) {
            bos.write(buffer, 
    0
    , bytesRead);
        }
        bos.flush();
        fis.close();
        bis.close();
        fos.close();
        bos.close();

        
    return
     
    null
    ;
    }

}