java 从 BufferedReader (readLine) 读取返回 null？
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原文地址: http://stackoverflow.com/questions/10202515/
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Reading from a BufferedReader (readLine) returns null?
提问by Charlie
I am currently trying to read a Stringfrom a BufferedReaderbut cant find a way to do this...
我目前正在尝试String从 a 中读取 aBufferedReader但无法找到一种方法来执行此操作...
Of course I tried
我当然试过了
BufferedReader inStream = null;
inStream = new BufferedReader(new InputStreamReader(client.getInputStream()));
String test = inStream.readLine();
However the result turns out as null when trying to print to a screen even though the BufferedReader inStreamis equal to some kind of message.
然而，即使BufferedReader inStream等于某种消息，尝试打印到屏幕时结果也为空。
回答by Attila
Based on the documentation, the BufferedReader.readLine()returns nullonly when the end of the stream is reached. This means if the first call to readLine()returns null, there was nothing in the input stream to begin with.
根据文档，只有在到达流的末尾时才BufferedReader.readLine()返回null。这意味着如果第一次调用readLine()返回null，则输入流中没有任何内容可以开始。
