Java实现InputStream的任意拷贝方式

ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
byte[] buffer = new byte[1024];
int len;
while ((len = input.read(buffer)) > -1 ) {
    baos.write(buffer, 0, len);
}
baos.flush();
 
// 打开一个新的输入流
InputStream is1 = new ByteArrayInputStream(baos.toByteArray()); 
InputStream is2 = new ByteArrayInputStream(baos.toByteArray());

private static InputStream cloneInputStream(InputStream input) {
    try {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = input.read(buffer)) > -1) {
            baos.write(buffer, 0, len);
        }
        baos.flush();
        return new ByteArrayInputStream(baos.toByteArray());
    } catch (ioException e) {
        e.printStackTrace();
        return null;
    }
}