[英]Reading a text file using BufferedReader and Scanner
I need to read the first n lines of a text file as lines (each line may or may not contain whitespace). 我需要读取文本文件的前n行作为行(每行可能包含或不包含空格)。 The remainder of the text file contains an unknown number N of tokens that are whitespace-delimited (delimiters are a mixture of space, tab, and newline characters, all to be treated identically as delimiters).
文本文件的其余部分包含未知数量N的以空格分隔的标记(分隔符是空格,制表符和换行符的混合,所有这些都被视为与分隔符完全相同)。
I know how to read lines using BufferedReader. 我知道如何使用BufferedReader读取行。 I know how to read tokens using Scanner.
我知道如何使用Scanner读取令牌。 But how do I combine these two different modes of reading for a single text file, in the above described manner?
但是,如何以上述方式将这两种不同的阅读模式组合成单个文本文件?
You could use a Scanner
for both tasks. 您可以使用
Scanner
执行这两项任务。 See the Scanner.nextLine
method. 请参阅
Scanner.nextLine
方法。
If you really need to use both a BufferedReader
and a Scanner
you could simply do it like this: 如果你真的需要同时使用
BufferedReader
和Scanner
你可以这样做:
byte[] inputBytes = "line 1\nline 2\nline 3\ntok 1 tok 2".getBytes();
Reader r = new InputStreamReader(new ByteArrayInputStream(inputBytes));
BufferedReader br = new BufferedReader(r);
Scanner s = new Scanner(br);
System.out.println("First line: " + br.readLine());
System.out.println("Second line: " + br.readLine());
System.out.println("Third line: " + br.readLine());
System.out.println("Remaining tokens:");
while (s.hasNext())
System.out.println(s.next());
Output: 输出:
First line: line 1 // from BufferedReader
Second line: line 2 // from BufferedReader
Third line: line 3 // from BufferedReader
Remaining tokens:
tok // from Scanner
1 // from Scanner
tok // from Scanner
2 // from Scanner
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