全屏
java.io.BufferedInputStream.available() 方法返回从输入流中读取不受阻塞，输入流方法的下一次调用的剩余字节数。
声明
以下是java.io.BufferedInputStream.available()方法的声明public int available()
返回值
此方法返回的字节数保持从此输入流中读取而不阻塞。
异常IOException -- -- 如果发生I/O错误.
例子
下面的示例演示java.io.BufferedInputStream.available()方法的用法。package cn.sxt;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
public class BufferedInputStreamDemo {
public static void main(String[] args) throws Exception {
InputStream inStream = null;
BufferedInputStream bis = null;
try{
// open input stream test.txt for reading purpose.
inStream = new FileInputStream("c:/test.txt");
// input stream is converted to buffered input stream
bis = new BufferedInputStream(inStream);
// read until a single byte is available
while( bis.available() > 0 )
{
// get the number of bytes available
Integer nBytes = bis.available();
System.out.println("Available bytes = " + nBytes );
// read next available character
char ch = (char)bis.read();
// print the read character.
System.out.println("The character read = " + ch );
}
}catch(Exception e){
e.printStackTrace();
}finally{
// releases any system resources associated with the stream
if(inStream!=null)
inStream.close();
if(bis!=null)
bis.close();
}
}}
假设有一个文本文件c:/ test.txt，它具有以下内容。该文件将被用作输入我们的示例程序：ABCDE
编译和运行上面的程序，这将产生以下结果：Available bytes = 5
The character read = A
Available bytes = 4
The character read = B
Available bytes = 3
The character read = C
Available bytes = 2
The character read = D
Available bytes = 1
The character read = E
分享到：
0评论
