IO流一些使用方式
使用BufferedReader读取文本中的一行数据：
File file = new File("src/main/java/1.txt");
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
br.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}