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。
以下是java.io.BufferedInputStream.available()方法的声明
public int available()
此方法返回的字节数保持从此输入流中读取而不阻塞。
IOException -- -- 如果发生I/O错误.
下面的示例演示java.io.BufferedInputStream.available()方法的用法。
package com.yiibai; 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
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