如何搜索一个分两行的单词？

Question

我正在用java编写一个程序，在一个.txt文件中搜索单词列表（事务编号）。txt文件可以有任意行数。

List<String> transactionList = new ArrayList<String>(
            Arrays.asList("JQ7P00049", "TM7P04797", "RT6P70037");
FileReader fileReader = new FileReader(filePath);
BufferedReader bufferedReader = new BufferedReader(fileReader);
        try {
            String readLine = bufferedReader.readLine();
            for (String transactionIndex : transactionList) {
                if (readLine != null) {
                    if (readLine.contains(transactionIndex)) {
                        System.out.println(transactionIndex + ": true");
                        readLine = bufferedReader.readLine();
                    } else {
                        readLine = bufferedReader.readLine();
                    }
                }
            }
        }

有没有办法处理这种情况？

Answer 1

正如durron597所提到的，您没有遍历整个文件，但这里有一个解决方案，假设文件至少有2行，并且事务字符串的跨度不超过2行。

它将每一行与下一行串联，并在串联的行中搜索字符串。为了防止同一笔交易被打印两次，我添加了一张额外的支票。

    List<String> transactionList = new ArrayList<String>( Arrays.asList("JQ7P00049", "TM7P04797", "RT6P70037") );
    FileReader fileReader = new FileReader(filePath);
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    try {
        // Search the first line
        String lastLine = bufferedReader.readLine();
        for (String transactionIndex : transactionList) {
            if (lastLine.contains(transactionIndex)) {
                System.out.println(transactionIndex + ": true");
            } 
        }
        String currentLine = null;

        // Search the remaining lines
        while((currentLine=bufferedReader.readLine()) != null) {
            String combined = lastLine + currentLine;
            for (String transactionIndex : transactionList) {
                if (currentLine.contains(transactionIndex) || (!lastLine.contains(transactionIndex) && combined.contains(transactionIndex))) {
                    System.out.println(transactionIndex + ": true");
                } 
            }
            lastLine = currentLine;
        }

    } catch ( Exception e ) {
        System.out.println( e.getClass().getSimpleName() + ": " + e.getMessage() );
    } finally {
        bufferedReader.close();
    }