src/org/nutz/lang/Streams.java
public static byte[] readBytes(InputStream ins) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        write(out, ins);
        return out.toByteArray();
    }
public static byte[] readBytes(InputStream ins) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        write(out, ins);
        return out.toByteArray();
    }
读取一个输入流中所有的字节

@param ins
输入流，必须支持 available()
@return 一个字节数组
@throws IOException