之前在网上随便找了下面Java代码上传文件到FTP服务器，但是自从换了一个FTP服务器下面的代码就不好使了，上传也不报错，就是无法上传。但是会生成一个xxx.tmp文件在FTP上

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public void upload(String localFile, String remoteFile) throws FtpProtocolException  
 {  
     this.localfilename = localFile;  
     this.remotefilename = remoteFile;  
     OutputStream os = null;  
     FileInputStream is = null;  
     try  
     {  

         os =  ftpClient.putFileStream(this.remotefilename, true);  
  
         File file_in = new File(this.localfilename);  
         is = new FileInputStream(file_in);  
  
         byte[] bytes = new byte[1024];  
         int c;  
         while ((c = is.read(bytes)) != -1)  
         {  
             os.write(bytes, 0, c);  
         }  
         System.out.println("upload to FTP success");  
     } catch (IOException ex)  
     {  
         System.out.println("not upload to FTP");  
         ex.printStackTrace();  
         throw new RuntimeException(ex);  
     } finally  
     {  
         try  
         {  
             if (is != null)  
             {  
                 is.close();  
             }  
         } catch (IOException e)  
         {  
             e.printStackTrace();  
         } finally  
         {  
             try  
             {  
                 if (os != null)  
                 {  
                     os.close();  
                 }  
             } catch (IOException e)  
             {  
                 e.printStackTrace();  
             }  
         }  
     }  
 }

折腾了一下改为下面代码就可以上传成功了，不会有tmp文件生成

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public void upload(String localFile, String remoteFile) throws FtpProtocolException  
 {  
     this.localfilename = localFile;  
     this.remotefilename = remoteFile; 
     FileInputStream is = null;  
     try  
     {  

     	File file_in = new File(this.localfilename);  
         is = new FileInputStream(file_in);  
         ftpClient.putFile(remoteFile, is);
     } catch (IOException ex)  
     {  
         System.out.println("not upload to FTP");  
         ex.printStackTrace();  
         throw new RuntimeException(ex);  
     } finally  
     {  
         try  
         {  
             if (is != null)  
             {  
                 is.close();  
             }  
         } catch (IOException e)  
         {  
             e.printStackTrace();  
         }
     }  
 }

具体原因不得而知，反正问题是解决了