Spring + FTP 文件上傳下載

首先說一下ftp的特點是：傳輸速度快，適用于上傳大文件，適用于局域網絡。

直奔主題，這里采用apache提供的網絡包，commons-net.jar。我用的3.3。

ftp上傳需要ftp服務器。這里描述客戶端的實現。

spring 文件上傳這一塊就不做描述

直接代碼（上傳）

@RequestMapping(value = "/uploadConfigFile")
    @ResponseBody
    public void uploadConfigFile(@RequestParam("uploadFile") MultipartFile uploadFile){
        FTPClient ftpClient = new FTPClient(); 
        try { 
            ftpClient.connect("120.120.120.156",21); 
            ftpClient.login("user1", "user1"); 
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

            //設置上傳目錄 
            ftpClient.changeWorkingDirectory("/GOS_CAS/RECONVERT/cas_config_reconvert"); 
            String fileName = new String(uploadFile.getOriginalFilename().getBytes("utf-8"),"iso-8859-1");

            FTPFile[] fs = ftpClient.listFiles();  
            if (fs!=null && fs.length>0) {
                for(int i=0;i<fs.length;i++){
                    if (fs[i].getName().equals(fileName)) {
                        ftpClient.deleteFile(fs[i].getName());
                        break;
                    }
                }
            }
            OutputStream os = ftpClient.appendFileStream(fileName);
            byte[] bytes = new byte[1024];
            InputStream is = uploadFile.getInputStream();
            // 開始復制 其實net已經提供了上傳的函數，但是我想可能是我這個版本有點問題                                                           //ftpClient.storeFile("", fis); 

                                            // 于是我自己write出去了，其實我想都是一樣的效果，在這里告訴大家這兩種方式都能實現 

                         int c;
            // 暫未考慮中途終止的情況
            while ((c = is.read(bytes)) != -1) {
                os.write(bytes, 0, c);
            }
            os.flush();
            is.close();
            os.close();
            RestoreConfiguration restoreConfiguration = new RestoreConfiguration();
            restoreConfiguration.setStrName(fileName);
            getServiceStub().restoreConfiguration(restoreConfiguration);
        } catch (IOException e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                ftpClient.disconnect(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        }
    }

下載

@RequestMapping(value = "/downloadConfigFile")
    public void downloadConfigFile(HttpServletResponse response,@RequestParam("fileName")String fileName) {

        response.setCharacterEncoding("UTF-8");
        response.setContentType("multipart/form-data");

            FTPClient ftpClient = new FTPClient(); 
            try {  
                int reply;  
                ftpClient.connect("120.120.120.156",21); 
                ftpClient.login("user1", "user1");
                reply = ftpClient.getReplyCode();  
                if (!FTPReply.isPositiveCompletion(reply)) {  
                    ftpClient.disconnect();
                    return;  
                }
                ftpClient.changeWorkingDirectory("/GOS_CAS/BACKUP/cas_config_backup");//轉移到FTP服務器目錄  
                FTPFile[] fs = ftpClient.listFiles();  
                for(int i=0;i<fs.length;i++){  
                    if(fs[i].getName().equals(fileName)){
                        String saveAsFileName = new String(fs[i].getName().getBytes("UTF-8"), "ISO8859-1");  
                        response.setHeader("Content-Disposition", "attachment;fileName="+saveAsFileName);
                        OutputStream os = response.getOutputStream();
                        ftpClient.retrieveFile(fs[i].getName(), os);
                        os.flush();
                        os.close();
                        break;
                    }
                }
                ftpClient.logout();  
            } catch (IOException e) {  
                e.printStackTrace();  
            } finally {  
                if (ftpClient.isConnected()) {  
                    try {  
                        ftpClient.disconnect();  
                    } catch (IOException ioe) {  
                    }  
                }  
            }  
    }