Java 如何读取文件？

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

仅执行此操作

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BufferedReader br=新的BufferedReaderNewFileReaderAAA.txt

但是将文件放在filereader中

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希望对您有所帮助。

您在哪一行获得异常的可能重复项？BufferedReader br=new BufferedReadernew FileReader ResourcesStream.toString；在这里

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();
    }
}