九阴真经


InputStream小技巧

<ul> <li>InputStream读流不用while循环实现之fileInputStream.available()</li> </ul> <pre><code>fileInputStream.available() 返回可以读取的剩余字节数的估计值 代码示例: String url="F:\\img\\cat.jpg"; File file=new File(url); FileInputStream fileInputStream=new FileInputStream(file); //读取可用的字节大小,填充 byte[] arr=new byte[fileInputStream.available()]; fileInputStream.read(arr); FileOutputStream fileOutputStream=new FileOutputStream(new File("F:\\img\\cat33.jpg")); fileOutputStream.write(arr); fileOutputStream.flush(); fileInputStream.c System.out.println(Base64.getEncoder().encodeToString(arr)); </code></pre>

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