你的try catch语句没写全吧
没啥太大问题,你的d:\java是个文件吗?
public static void main(String[] args) throws Exception {
try (FileInputStream fileInputStream = new FileInputStream("./src/main/java/com/example/demo/Test.java")) {
while (true) {
int read = fileInputStream.read();
if (read == -1) {
break;
}
System.out.println((char) read);
}
}
}