直接从URL读取并写入文件 - Java [英] Read directly from a URL and write in a file - Java

问题描述

我正在阅读一个URL的内容，然后编写一个文件，问题是我无法写出文件中的所有内容，也不知道我在做什么错。

我的代码，

  try {
 URL url = new URL（sourceUri）; 
 URLConnection conn = url.openConnection（）; 
 
 BufferedReader br = new BufferedReader（new InputStreamReader（conn.getInputStream（）））; 
 
 
 file.getParentFile（）。mkdirs（）; 
 file.createNewFile（）; 
 
 FileWriter fw = new FileWriter（file）; 
 BufferedWriter bw = new BufferedWriter（fw）; （（inputLine = br.readLine（））！= null）{
 bw.write（inputLine + System.getProperty（line.separator））; 
 
 
} 
 
 br.close（）; 
 
 System.out.println（DONE）; 
 $ b $ catch（IOException ioe）{
 ioe.printStackTrace（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
 
返回本体; 
 
 $ / code $ / pre 
 $ b $ p请帮忙
 
解决方案
问题是你正在使用一个BufferedWriter，你不关闭它。它的缓冲区中有一些内容不是在写，而是你不知道。
 
 
 
尝试刷新缓冲区并关闭BufferedWriter：
  bw.flush（）; 
 bw.close（）; 
  
包括这两行后面的br.close（）;。
 
 
 
你也可以阅读BufferedWriter如何工作 here。
 
 
 
我想你也应该关闭FileWriter，以解除阻止文件。 b $ b 
  fw.close（）; 
  
 编辑1：  
 
 
关闭BufferedWriter将为您刷新缓冲区。您只需要关闭它。
 
I am reading the contents of a URL and write a file the problem is that I'm not able to write all the content in the file and do not know what I'm doing wrong.

My code,
try {
            URL url = new URL(sourceUri);
            URLConnection conn = url.openConnection();

            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));


            file.getParentFile().mkdirs();
            file.createNewFile();

            FileWriter fw = new FileWriter(file);
            BufferedWriter bw  = new BufferedWriter(fw);

            while ((inputLine = br.readLine()) != null) {
                bw.write(inputLine + System.getProperty("line.separator"));
            }

            br.close();

            System.out.println("DONE");

        }catch (IOException ioe){
            ioe.printStackTrace();
        }catch (Exception e){
            e.printStackTrace();
        }

        return ontologies;
    }
Please help
解决方案
The problem is you're using a BufferedWriter and you don't close it. It has some content in his buffer that is not writing and you're missing.

Try flushing the buffer and closing the BufferedWriter:
bw.flush();
bw.close();
Include this two lines after before your "br.close();".

Also you can read how BufferedWriter works here.

And I think you should close FileWriter too, in order to unblock the file.
fw.close();
EDIT 1:

Closing the BufferedWriter will flush the buffer for you. You need only to close it.

                        
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