输入字符串“1”的java.lang.NumberFormatException。 [英] java.lang.NumberFormatException for input string "1"

问题描述

所以，我有一个真正困扰我的问题。我有一个简单的解析器，我在java中。以下是相关代码：

So, I have an issue that really bothers me. I have a simple parser that I made in java. Here is the piece of relevant code:

while( (line = br.readLine())!=null)
{
    String splitted[] = line.split(SPLITTER);
    int docNum = Integer.parseInt(splitted[0].trim());
    //do something
}

输入文件是CSV文件，第一个该文件的输入是一个整数。当我开始解析时，我会立即得到这个异常：

Input file is CSV file, the first entry of the file being an integer. When I start parsing, I immidiately get this exception:

Exception in thread "main" java.lang.NumberFormatException: For input string: "1"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:580)
at java.lang.Integer.parseInt(Integer.java:615)
at dipl.parser.TableParser.parse(TableParser.java:50)
at dipl.parser.DocumentParser.main(DocumentParser.java:87)

我检查了文件，确实有1作为第一个值（该字段中没有其他字符） ，但我仍然得到消息。我认为可能是因为文件编码：它是UTF-8，带有Unix端线。该程序在Ubuntu 14.04上运行。欢迎任何寻找问题的建议。

I checked the file, it indeed has 1 as its first value (no other characters are in that field), but I still get the message. I think that it may be because of file encoding: it is UTF-8, with Unix endlines. And the program is run on Ubuntu 14.04. Any suggestions where to look for the problem are welcome.

推荐答案

你有一个 BOM ;如果我在你的问题中复制了类似1的内容并将其粘贴到 vim 中，我看到你有一个FE FF（例如， BOM ）就在它前面。从该链接：

You have a BOM in front of that number; if I copy what looks like "1" in your question and paste it into vim, I see that you have a FE FF (e.g., a BOM) in front of it. From that link:

构成BOM的确切字节将是通过该转换格式转换为Unicode字符U + FEFF的任何内容。 / p>

The exact bytes comprising the BOM will be whatever the Unicode character U+FEFF is converted into by that transformation format.

这就是问题所在，使用适当的读取器使用该文件进行转换（UTF-8，UTF-16 big-endian，UTF） -16 little-endian等）文件用。有关使用Java读取Unicode文件的更多信息，另请参阅此问题及其答案。

So that's the issue, consume the file with the appropriate reader for the transformation (UTF-8, UTF-16 big-endian, UTF-16 little-endian, etc.) the file is encoded with. See also this question and its answers for more about reading Unicode files in Java.

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