在 Java 中一次读取两行文本文件的最佳方法是什么？

发布于 2024-07-11 17:32:22 字数 282 浏览 5 评论 0原文

BufferedReader in;

String line;
while ((line = in.readLine() != null) {
    processor.doStuffWith(line);
}

这就是我逐行处理文件的方式。然而，在这种情况下，我想在每次迭代中向处理器发送两行文本。（我正在处理的文本文件基本上将一条记录存储在两行中，因此我每次都向处理器发送一条记录。）

在 Java 中执行此操作的最佳方法是什么？

原文

BufferedReader in;

String line;
while ((line = in.readLine() != null) {
    processor.doStuffWith(line);
}

This is how I would process a file line-by-line. In this case, however, I want to send two lines of text to the processor in every iteration. (The text file I'm processing essentially stores one record on two lines, so I'm sending a single record to the processor each time.)

What's the best way of doing this in Java?

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怀念你的温柔 2024-07-18 17:32:22

为什么不只读两行呢？

BufferedReader in;
String line;
while ((line = in.readLine() != null) {
    processor.doStuffWith(line, in.readLine());
}

这假设您可以依赖输入文件中包含完整的 2 行数据集。

Why not just read two lines?

BufferedReader in;
String line;
while ((line = in.readLine() != null) {
    processor.doStuffWith(line, in.readLine());
}

This assumes that you can rely on having full 2-line data sets in your input file.

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べ映画 2024-07-18 17:32:22

BufferedReader in;
String line1, line2;

while((line1 = in.readLine()) != null 
   && (line2 = in.readLine()) != null))
{
    processor.doStuffWith(line1, line2);
}

或者，如果您愿意，也可以将它们连接起来。

BufferedReader in;
String line1, line2;

while((line1 = in.readLine()) != null 
   && (line2 = in.readLine()) != null))
{
    processor.doStuffWith(line1, line2);
}

Or you could concatenate them if you wanted.

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守不住的情 2024-07-18 17:32:22

我会重构代码，使其看起来像这样：

RecordReader recordReader;
Processor processor;

public void processRecords() {
    Record record;

    while ((record = recordReader.readRecord()) != null) {
        processor.processRecord(record);
    }
}

当然，在这种情况下，您必须以某种方式将正确的记录读取器注入到此类中，但这不应该是问题。

RecordReader 的一种实现可能如下所示：

class BufferedRecordReader implements RecordReader
{
    BufferedReader in = null;

    BufferedRecordReader(BufferedReader in)
    {
        this.in = in;
    }
    public Record readRecord()
    {
        String line = in.readLine();

        if (line == null) {
            return null;
        }

        Record r = new Record(line, in.readLine());

        return r;
    }
}

I would refactor code to look somehow like this:

RecordReader recordReader;
Processor processor;

public void processRecords() {
    Record record;

    while ((record = recordReader.readRecord()) != null) {
        processor.processRecord(record);
    }
}

Of course in that case you have to somehow inject correct record reader in to this class but that should not be a problem.

One implementation of the RecordReader could look like this:

class BufferedRecordReader implements RecordReader
{
    BufferedReader in = null;

    BufferedRecordReader(BufferedReader in)
    {
        this.in = in;
    }
    public Record readRecord()
    {
        String line = in.readLine();

        if (line == null) {
            return null;
        }

        Record r = new Record(line, in.readLine());

        return r;
    }
}

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