如何读取文件？

Question

private void getInput() throws IOException {

    InputStream resourceAsStream = this.getClass().getResourceAsStream(
            "aaa.txt");
    BufferedReader br = new BufferedReader(new FileReader(
            resourceAsStream.toString()));
    try {
        StringBuilder sb = new StringBuilder();
        String line = br.readLine();

        while (line != null) {
            sb.append(line);
            sb.append(System.lineSeparator());
            line = br.readLine();
        }
        String everything = sb.toString();
        System.out.println(everything);
    } finally {
        br.close();
    }
}

文件aaa.txt在同一个项目中，无法读取，执行时出现java.lang.NullPointerException。

Answer 1

只做这个

BufferedReader br = new BufferedReader(new FileReader("aaa.txt"));

但是将文件放在文件阅读器中。

希望对你有所帮助。