java - 从多个文本文件中读取数据

Question

这个问题已经有答案了:

java.lang.IllegalStateException: Scanner closed (1 个回答)

已关闭 4 年前。

我的文本文件位于文件夹中。它们都包含字母和数字。例如我的 tex 文件之一包含:

db: localhost
data created: 2016-01-18
user: root
pass: usbw

所以我想扫描文件夹中的所有文件。并将每个文本文件中的信息打印到屏幕上。到目前为止正在尝试使用此代码:

class FileHandle {
    int i;
    String a;
    String b;

    public void openFile() throws FileNotFoundException {
        File dir = new File("C:/Folder/DB");
        if (dir.isDirectory()) {
            for (File file : dir.listFiles()) {
                Scanner s = new Scanner(file);
                String f = file.getName();
                System.out.println("File name:" + f);
                while (s.hasNext()) {
                    if (s.hasNextInt()) {
                        i = s.nextInt();
                        System.out.println("int: " + i);
                    }
                    a = s.next();
                    b = s.next();
                    System.out.printf("%s", a);
                    System.out.printf("%s", b);
                    s.close();
                }
            }
        }
    }
}

但是我得到了一个错误:

File name:LocalDB.txt
Exception in thread "main" java.lang.IllegalStateException: Scanner closed
    at java.util.Scanner.ensureOpen(Scanner.java:1070)
localhostCreated:   at java.util.Scanner.hasNext(Scanner.java:1334)
    at databasesearch.FileHandle.openFile(FileHandle.java:30)
    at databasesearch.DatabaseSearch.main(DatabaseSearch.java:21)
 C:\Users\D1sturbance\AppData\Local\NetBeans\Cache\8.1\executor-     snippets\run.xml:53: Java returned: 1
 BUILD FAILED (total time: 0 seconds)

Answer 1

删除s.close();或将其移至while循环之外。