JAVA：IO 异常：原因流已关闭
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JAVA: IO Exception: Reason Stream closed
提问by Bob
Why am I getting the following exception? What I am doing is writing a giant ArrayList line by line to a file onto the disk. The file generated is about >700MB. It seems like it has some problem when written line by line. Could the size of the file a reason? Why is the stream closed? By the way, I am working on a Windows OS.
为什么我会收到以下异常？我正在做的是将一个巨大的 ArrayList 一行一行地写入磁盘上的文件。生成的文件大约>700MB。一行一行写的时候好像有点问题。文件的大小可能是一个原因吗？为什么流关闭？顺便说一下，我正在使用 Windows 操作系统。
FileWriter evaluated_result =
new FileWriter(path_output+this.algorithm+"/"+query_type+"/"+"queries.eval");
BufferedWriter out = new BufferedWriter(evaluated_result);
out.write(Myobject);
out.newLine();
evaluated_result.close();
out.close();
The exception is as follows:
例外情况如下：
java.io.IOException: Stream closed
at sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:45)
at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:118)
at java.io.OutputStreamWriter.write(OutputStreamWriter.java:207)
at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:129)
at java.io.BufferedWriter.close(BufferedWriter.java:264)
at Assignment_1.Query_Evaluator.write100BestDocumentsEvalFormat(Query_Evaluator.java:85)
at Assignment_1.Experiment.ConductExperiment(Experiment.java:54)
at Assignment_1.Main.main(Main.java:78)
回答by Jord?o
You should close the BufferedWriterbeforeclosing the FileWriter.
您应该BufferedWriter在关闭FileWriter.
And, the closing calls should be in a finally block. This is one way to do it (with one finally):
并且，结束调用应该在 finally 块中。这是一种方法（最后一种）：
FileWriter evaluated_result = new FileWriter(path_output+this.algorithm+"/"+query_type+"/"+"queries.eval");
BufferedWriter out = new BufferedWriter(evaluated_result);
try {
out.write(Myobject);
out.newLine();
}
finally {
if (out != null) out.close();
if (evaluated_result != null) evaluated_result.close();
}
(Look herefor more options)
（更多选项请看这里）
Also note that, as mentioned by @oldrinb, you don't have to close nested streams. But I think it's good practice anyway.
另请注意，正如@oldrinb 所提到的，您不必关闭嵌套流。但我认为无论如何这是一个很好的做法。
With Java 7 you can use the try-with-resourcesstatement.
在 Java 7 中，您可以使用try-with-resources语句。
