file Java 读取_Java读取文件方法汇总

好的，下面是Java读取文件的几种常见方法：

1. 使用FileInputStream和BufferedInputStream类：

File file = new File("file.txt");
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis);
byte[] contents = new byte[1024];
int bytesRead = 0;
while((bytesRead = bis.read(contents)) != -1) { 
    System.out.print(new String(contents, 0, bytesRead)); 
} 

2. 使用Scanner类：

File file = new File("file.txt");
Scanner scanner = new Scanner(file);
while(scanner.hasNextLine()) {
    String line = scanner.nextLine();
    System.out.println(line);
}
scanner.close();

3. 使用BufferedReader类：

File file = new File("file.txt");
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
    System.out.println(line);
}
br.close();

4. 使用Files类：

Path path = Paths.get("file.txt");
List<String> lines = Files.readAllLines(path);
for (String line : lines) {
    System.out.println(line);
}

以上是Java读取文件的几种常见方法，你可以根据自己的需求选择适合的方法。