Java采用Netty实现基于DTU的TCP服务器 + 多端口 + 多协议

/* * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * */ package qx.drc.utils; import java.security.*; /** * A class that represents an immutable universally unique identifier (UUID). * A UUID represents a 128-bit value. * * <p> There exist different variants of these global identifiers. The methods * of this class are for manipulating the Leach-Salz variant, although the * constructors allow the creation of any variant of UUID (described below). * * <p> The layout of a variant 2 (Leach-Salz) UUID is as follows: * * The most significant long consists of the following unsigned fields: * <pre> * 0xFFFFFFFF00000000 time_low * 0x00000000FFFF0000 time_mid * 0x000000000000F000 version * 0x0000000000000FFF time_hi * </pre> * The least significant long consists of the following unsigned fields: * <pre> * 0xC000000000000000 variant * 0x3FFF000000000000 clock_seq * 0x0000FFFFFFFFFFFF node * </pre> * * <p> The variant field contains a value which identifies the layout of the * {@code UUID}. The bit layout described above is valid only for a {@code * UUID} with a variant value of 2, which indicates the Leach-Salz variant. * * <p> The version field holds a value that describes the type of this {@code * UUID}. There are four different basic types of UUIDs: time-based, DCE * security, name-based, and randomly generated UUIDs. These types have a * version value of 1, 2, 3 and 4, respectively. * * <p> For more information including algorithms used to create {@code UUID}s, * see <a href="http://www.ietf.org/rfc/rfc4122.txt"> <i>RFC&nbsp;4122: A * Universally Unique IDentifier (UUID) URN Namespace</i></a>, section 4.2 * &quot;Algorithms for Creating a Time-Based UUID&quot;. * * @since 1.5 */ public final class UUID implements java.io.Serializable, Comparable<UUID> { /** * Explicit serialVersionUID for interoperability. */ private static final long serialVersionUID = -4856846361193249489L; /* * The most significant 64 bits of this UUID. * * @serial */ private final long mostSigBits; /* * The least significant 64 bits of this UUID. * * @serial */ private final long leastSigBits; /* * The random number generator used by this class to create random * based UUIDs. In a holder class to defer initialization until needed. */ private static class Holder { static final SecureRandom numberGenerator = new SecureRandom(); } // Constructors and Factories /* * Private constructor which uses a byte array to construct the new UUID. */ private UUID(byte[] data) { long msb = 0; long lsb = 0; assert data.length == 16 : "data must be 16 bytes in length"; for (int i=0; i<8; i++) msb = (msb << 8) | (data[i] & 0xff); for (int i=8; i<16; i++) lsb = (lsb << 8) | (data[i] & 0xff); this.mostSigBits = msb; this.leastSigBits = lsb; } /** * Constructs a new {@code UUID} using the specified data. {@code * mostSigBits} is used for the most significant 64 bits of the {@code * UUID} and {@code leastSigBits} becomes the least significant 64 bits of * the {@code UUID}. * * @param mostSigBits * The most significant bits of the {@code UUID} * * @param leastSigBits * The least significant bits of the {@code UUID} */ public UUID(long mostSigBits, long leastSigBits) { this.mostSigBits = mostSigBits; this.leastSigBits = leastSigBits; } /** * Static factory to retrieve a type 4 (pseudo randomly generated) UUID. * * The {@code UUID} is generated using a cryptographically strong pseudo * random number generator. * * @return A randomly generated {@code UUID} */ public static UUID randomUUID() { SecureRandom ng = Holder.numberGenerator; byte[] randomBytes = new byte[16]; ng.nextBytes(randomBytes); randomBytes[6] &= 0x0f; /* clear version */ randomBytes[6] |= 0x40; /* set to version 4 */ randomBytes[8] &= 0x3f; /* clear variant */ randomBytes[8] |= 0x80; /* set to IETF variant */ return new UUID(randomBytes); } /** * Static factory to retrieve a type 3 (name based) {@code UUID} based on * the specified byte array. * * @param name * A byte array to be used to construct a {@code UUID} * * @return A {@code UUID} generated from the specified array */ public static UUID nameUUIDFromBytes(byte[] name) { MessageDigest md; try { md = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException nsae) { throw new InternalError("MD5 not supported", nsae); } byte[] md5Bytes = md.digest(name); md5Bytes[6] &= 0x0f; /* clear version */ md5Bytes[6] |= 0x30; /* set to version 3 */ md5Bytes[8] &= 0x3f; /* clear variant */ md5Bytes[8] |= 0x80; /* set to IETF variant */ return new UUID(md5Bytes); } /** * Creates a {@code UUID} from the string standard representation as * described in the {@link #toString} method. * * @param name * A string that specifies a {@code UUID} * * @return A {@code UUID} with the specified value * * @throws IllegalArgumentException * If name does not conform to the string representation as * described in {@link #toString} * */ public static UUID fromString(String name) { String[] components = name.split("-"); if (components.length != 5) throw new IllegalArgumentException("Invalid UUID string: "+name); for (int i=0; i<5; i++) components[i] = "0x"+components[i]; long mostSigBits = Long.decode(components[0]).longValue(); mostSigBits <<= 16; mostSigBits |= Long.decode(components[1]).longValue(); mostSigBits <<= 16; mostSigBits |= Long.decode(components[2]).longValue(); long leastSigBits = Long.decode(components[3]).longValue(); leastSigBits <<= 48; leastSigBits |= Long.decode(components[4]).longValue(); return new UUID(mostSigBits, leastSigBits); } // Field Accessor Methods /** * Returns the least significant 64 bits of this UUID's 128 bit value. * * @return The least significant 64 bits of this UUID's 128 bit value */ public long getLeastSignificantBits() { return leastSigBits; } /** * Returns the most significant 64 bits of this UUID's 128 bit value. * * @return The most significant 64 bits of this UUID's 128 bit value */ public long getMostSignificantBits() { return mostSigBits; } /** * The version number associated with this {@code UUID}. The version * number describes how this {@code UUID} was generated. * * The version number has the following meaning: * <ul> * <li>1 Time-based UUID * <li>2 DCE security UUID * <li>3 Name-based UUID * <li>4 Randomly generated UUID * </ul> * * @return The version number of this {@code UUID} */ public int version() { // Version is bits masked by 0x000000000000F000 in MS long return (int)((mostSigBits >> 12) & 0x0f); } /** * The variant number associated with this {@code UUID}. The variant * number describes the layout