直接从URL读取并写入文件

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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.