fileinputstream read
时间: 2023-04-30 17:03:58 浏览: 51
fileinputstream read 是 Java 编程语言中一个用来从文件中读取数据的方法。该方法可以以字节为单位,逐个字节地读取文件中的数据,并将其存储到内存中的缓冲区中。读取数据之前,需要先通过创建一个 FileInputStream 对象来打开所要读取的文件,并将其传递给该方法。
相关问题
FileInputStream read方法
FileInputStream的read方法是从输入流中读取数据的字节,每次调用read方法都会读取一个字节,并将其作为int类型返回。如果到达文件的末尾,则返回-1表示结束。
在提供的代码示例中,通过继承FileInputStream,并覆盖read(byte b)方法,实现了从输入流中读取多个字节的功能。在覆盖的read方法中,先调用read()方法读取一个字节,如果返回-1表示已经读取到文件的末尾,否则将该字节存入数组b的第一个位置。然后通过循环,继续调用read()方法读取下一个字节,并将其存入数组b的后续位置,直到数组b已满或读取到文件的末尾。最后返回读取的字节数。
在测试代码中,使用FileInputStream和MyFileInputStream读取了两个不同格式的文件。通过循环调用read()方法,并打印读取的字节内容,实现了读取文本内容的功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>
fileInputStream.read
The `read()` method in `FileInputStream` class is used to read a byte of data from the input stream. It returns the next byte of data, or -1 if the end of the file is reached.
Syntax:
```
public int read() throws IOException
```
Example usage:
```
FileInputStream fis = new FileInputStream("input.txt");
int data = fis.read();
while(data != -1) {
System.out.print((char)data);
data = fis.read();
}
fis.close();
```
In this example, the `FileInputStream` reads from a file named "input.txt". The `read()` method is used inside a loop to read each byte of data from the file and print it as a character. The loop continues until the end of the file is reached (`read()` returns -1), at which point the file input stream is closed.