Java 使用扫描仪和文本文件获取行中的特定字符串

所以我想让扫描器分析文本文件的每一行，并在x个单词之后停止，在这个例子中x=3

我的代码如下所示：

    scannerName.nextLine();
    scannerName.next();
    scannerName.next();
    scannerName.next();

好的，这里的问题是nextLine（）使扫描器前进超过当前行并返回字符串。因此，如果我调用next（），它将只找到下一行上的下一个字符串（对吗？）

有没有办法做到我的要求

谢谢

请尝试以下代码：- while（scannerName.hasNext（）！=null） {

---

}

您的问题不太准确，但我有一个从txt文件读取的解决方案：

Scanner scan = null;
    try {
        scan = new Scanner(new File("fileName.txt"));                       
    } catch (FileNotFoundException ex) {
        System.out.println("FileNotFoundException: " + ex.getMessage());
    } catch (Exception e) {
        System.out.println("Exception: " + e.getMessage());
    }

    int wordsRead = 0;
    int wordsToRead = 3;                               //== You can change this, to what you want...
    boolean keepReading = true;

    while (scan.hasNext() && keepReading) {
        String currentString = scan.nextLine();        //== Save the entire line in a String-object 
        for (String word : currentString.split(" ")) {
            System.out.println(word);                  //== Iterates over every single word - ACCESS TO EVERY WORD HAPPENS HERE
            wordsRead++;
            if (wordsRead == wordsToRead) {
                keepReading = false;                   //== makes sure the while-loop will stop looping
                break;                                 //== breaks when your predefined limit is is reached
            } //== if-end
        } //== for-end
    } //== while-end

如果您有任何问题，请告诉我：-）

Scanner scan = null;
    try {
        scan = new Scanner(new File("fileName.txt"));                       
    } catch (FileNotFoundException ex) {
        System.out.println("FileNotFoundException: " + ex.getMessage());
    } catch (Exception e) {
        System.out.println("Exception: " + e.getMessage());
    }

    int wordsRead = 0;
    int wordsToRead = 3;                               //== You can change this, to what you want...
    boolean keepReading = true;

    while (scan.hasNext() && keepReading) {
        String currentString = scan.nextLine();        //== Save the entire line in a String-object 
        for (String word : currentString.split(" ")) {
            System.out.println(word);                  //== Iterates over every single word - ACCESS TO EVERY WORD HAPPENS HERE
            wordsRead++;
            if (wordsRead == wordsToRead) {
                keepReading = false;                   //== makes sure the while-loop will stop looping
                break;                                 //== breaks when your predefined limit is is reached
            } //== if-end
        } //== for-end
    } //== while-end