Convert byte[], File, InputStream to each other in java

1、将File、FileInputStream 转换为byte数组：


File file = new File("test.txt");


InputStream input = new FileInputStream(file);


byte[] byt = new byte[input.available()];


input.read(byt);


 


2、将byte数组转换为InputStream：


byte[] byt = new byte[1024];


InputStream input = new ByteArrayInputStream(byt);


 


3、将byte数组转换为File：


File file = new File('');


OutputStream output = new FileOutputStream(file);


BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);


bufferedOutput.write(byt);