这些是必要的导入:

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

这是一种允许您通过将文件名作为参数传递给文件来读取文件的方法，如下所示:readFile("yourFile.txt");

And this is a method that will allow you to read from a File by passing it the filename as a parameter like this: readFile("yourFile.txt");

String readFile(String fileName) throws IOException {
    BufferedReader br = new BufferedReader(new FileReader(fileName));
    try {
        StringBuilder sb = new StringBuilder();
        String line = br.readLine();

        while (line != null) {
            sb.append(line);
            sb.append("
");
            line = br.readLine();
        }
        return sb.toString();
    } finally {
        br.close();
    }
}