Create a file and then delete in java

My requirement is there is an export button,onclick the data in the database is loaded and then converted into a .csv ,.doc or .html file ,which can be opened or saved somehere, this needs to be converted into a file , save it in the local path and uploaded to the SFTP server and deleted from the loacl path. My code goes like this .....

public String a(String tableName, String format,String jsondataAsString,String jsonKeyName,String userName,
            String password, String hostName,String remotePath) throws IOException{
        userName="a";
        password="a";
        hostName="10.100.10.100";
        remotePath="/tmp";
        System.out.println("TableName-->" +tableName);
        System.out.println("Format-->" +format);
        System.out.println("JsonData-->" +jsondataAsString);
        System.out.println("userName-->" +userName);
        System.out.println("password-->" +password);
        System.out.println("hostname-->" +hostName);
        System.out.println("RemotePath-->" +remotePath);
        String mimeType = null;
        String fileName = null;
        String seperator = null;        
        String lineSeperator = null;
        boolean isFileTransferComplete=true;
        OutputStream f1 =null;

        if (format.equalsIgnoreCase("CSV")) {
            fileName = tableName + ".csv";
            mimeType = "application/CSV";
            seperator = ",";
            lineSeperator = "\n";



        } else if (format.equalsIgnoreCase("Word")) {
            fileName = tableName + ".doc";
            mimeType = "application/msword";
            seperator = " ";
            lineSeperator = "\n\n";
        } else {

            fileName = tableName + ".html";
            mimeType = "application/html";
            seperator = "  ";
            lineSeperator = "<br><br>";
        }
        String localfilePath="D:/aaa/" +fileName;
        String error="";
    try{
        String data = convertJsonToString(jsondataAsString, seperator, jsonKeyName,lineSeperator,format);
        if (data == null || data.length() == 0) {
            data = "[BLANK]";
        }
       boolean isFileTobeDeleted=true;
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        System.out.println("Buffer-->" +buffer);

        buffer.flush();
        buffer.write(data.getBytes());

        f1 = new FileOutputStream(localfilePath);
        buffer.writeTo(开发者_开发知识库f1);

        isFileTransferComplete = new SFTPHandler(hostName,
                PicoEmsGuiConstants.SFTP_Port, userName, password)
                .uploadFile(remotePath,localfilePath);
        System.out.println("FileTransfer" +isFileTransferComplete);

          File target = new File(localfilePath);  

             target.delete();


         }
         System.out.println("isFileTobeDeleted" +isFileTobeDeleted);



        }catch(Exception e){
         System.out.println("Exception :::>" +e.getMessage());

        }finally{
            f1.close();
        }

        return isFileTransferComplete+"--"+ remotePath;

    }

I am able to create file but after the completion of uploading unable to delete form the loacl path...Can anyone tell me where i am goin wrong

Don't you have to close the stream and then attempt to delete it?

finally {
    f1.close();
    if(file != null && file.exists()) {
        file.delete();
    }
}