本文介绍了Java利用Redis实现消息队列的示例代码，分享给大家，具体如下：
应用场景
为什么要用redis?
二进制存储、java序列化传输、IO连接数高、连接频繁
一、序列化
这里编写了一个java序列化的工具,主要是将对象转化为byte数组,和根据byte数组反序列化成java对象; 主要是用到了ByteArrayOutputStream和ByteArrayInputStream; 注意:每个需要序列化的对象都要实现Serializable接口;
其代码如下:
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package Utils;import java.io.*;/** * Created by Kinglf on 2016/10/17. */public class ObjectUtil { /** * 对象转byte[] * @param obj * @return * @throws IOException */ public static byte[] object2Bytes(Object obj) throws IOException{ ByteArrayOutputStream bo=new ByteArrayOutputStream(); ObjectOutputStream oo=new ObjectOutputStream(bo); oo.writeObject(obj); byte[] bytes=bo.toByteArray(); bo.close(); oo.close(); return bytes; } /** * byte[]转对象 * @param bytes * @return * @throws Exception */ public static Object bytes2Object(byte[] bytes) throws Exception{ ByteArrayInputStream in=new ByteArrayInputStream(bytes); ObjectInputStream sIn=new ObjectInputStream(in); return sIn.readObject(); }} |
二、消息类(实现Serializable接口)
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package Model;import java.io.Serializable;/** * Created by Kinglf on 2016/10/17. */public class Message implements Serializable { private static final long serialVersionUID = -389326121047047723L; private int id; private String content; public Message(int id, String content) { this.id = id; this.content = content; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getContent() { return content; } public void setContent(String content) { this.content = content; }} |
三、Redis的操作
利用redis做队列,我们采用的是redis中list的push和pop操作;
结合队列的特点:
只允许在一端插入新元素只能在队列的尾部FIFO:先进先出原则 Redis中lpush头入(rpop尾出)或rpush尾入(lpop头出)可以满足要求,而Redis中list药push或 pop的对象仅需要转换成byte[]即可
java采用Jedis进行Redis的存储和Redis的连接池设置
上代码:
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package Utils;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;import java.util.List;import java.util.Map;import java.util.Set;/** * Created by Kinglf on 2016/10/17. */public class JedisUtil { private static String JEDIS_IP; private static int JEDIS_PORT; private static String JEDIS_PASSWORD; private static JedisPool jedisPool; static { //Configuration自行写的配置文件解析类,继承自Properties Configuration conf=Configuration.getInstance(); JEDIS_IP=conf.getString("jedis.ip","127.0.0.1"); JEDIS_PORT=conf.getInt("jedis.port",6379); JEDIS_PASSWORD=conf.getString("jedis.password",null); JedisPoolConfig config=new JedisPoolConfig(); config.setMaxActive(5000); config.setMaxIdle(256); config.setMaxWait(5000L); config.setTestOnBorrow(true); config.setTestOnReturn(true); config.setTestWhileIdle(true); config.setMinEvictableIdleTimeMillis(60000L); config.setTimeBetweenEvictionRunsMillis(3000L); config.setNumTestsPerEvictionRun(-1); jedisPool=new JedisPool(config,JEDIS_IP,JEDIS_PORT,60000); } /** * 获取数据 * @param key * @return */ public static String get(String key){ String value=null; Jedis jedis=null; try{ jedis=jedisPool.getResource(); value=jedis.get(key); }catch (Exception e){ jedisPool.returnBrokenResource(jedis); e.printStackTrace(); }finally { close(jedis); } return value; } private static void close(Jedis jedis) { try{ jedisPool.returnResource(jedis); }catch (Exception e){ if(jedis.isConnected()){ jedis.quit(); jedis.disconnect(); } } } public static byte[] get(byte[] key){ byte[] value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.get(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return value; } public static void set(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.set(key, value); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static void set(byte[] key, byte[] value, int time) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.set(key, value); jedis.expire(key, time); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static void hset(byte[] key, byte[] field, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hset(key, field, value); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static void hset(String key, String field, String value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hset(key, field, value); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } /** * 获取数据 * * @param key * @return */ public static String hget(String key, String field) { String value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.hget(key, field); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return value; } /** * 获取数据 * * @param key * @return */ public static byte[] hget(byte[] key, byte[] field) { byte[] value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.hget(key, field); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return value; } public static void hdel(byte[] key, byte[] field) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hdel(key, field); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } /** * 存储REDIS队列 顺序存储 * @param key reids键名 * @param value 键值 */ public static void lpush(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.lpush(key, value); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } /** * 存储REDIS队列 反向存储 * @param key reids键名 * @param value 键值 */ public static void rpush(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.rpush(key, value); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } /** * 将列表 source 中的最后一个元素(尾元素)弹出，并返回给客户端 * @param key reids键名 * @param destination 键值 */ public static void rpoplpush(byte[] key, byte[] destination) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.rpoplpush(key, destination); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } /** * 获取队列数据 * @param key 键名 * @return */ public static List lpopList(byte[] key) { List list = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); list = jedis.lrange(key, 0, -1); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return list; } /** * 获取队列数据 * @param key 键名 * @return */ public static byte[] rpop(byte[] key) { byte[] bytes = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); bytes = jedis.rpop(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return bytes; } public static void hmset(Object key, Map hash) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hmset(key.toString(), hash); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static void hmset(Object key, Map hash, int time) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hmset(key.toString(), hash); jedis.expire(key.toString(), time); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static List hmget(Object key, String... fields) { List result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hmget(key.toString(), fields); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return result; } public static Set hkeys(String key) { Set result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hkeys(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return result; } public static List lrange(byte[] key, int from, int to) { List result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.lrange(key, from, to); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return result; } public static Map hgetAll(byte[] key) { Map result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hgetAll(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return result; } public static void del(byte[] key) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.del(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } } public static long llen(byte[] key) { long len = 0; Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.llen(key); } catch (Exception e) { //释放redis对象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返还到连接池 close(jedis); } return len; }} |
四、Configuration主要用于读取Redis的配置信息
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package Utils;import java.io.IOException;import java.io.InputStream;import java.util.Properties;/** * Created by Kinglf on 2016/10/17. */public class Configuration extends Properties { private static final long serialVersionUID = -2296275030489943706L; private static Configuration instance = null; public static synchronized Configuration getInstance() { if (instance == null) { instance = new Configuration(); } return instance; } public String getProperty(String key, String defaultValue) { String val = getProperty(key); return (val == null || val.isEmpty()) ? defaultValue : val; } public String getString(String name, String defaultValue) { return this.getProperty(name, defaultValue); } public int getInt(String name, int defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Integer.parseInt(val); } public long getLong(String name, long defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Integer.parseInt(val); } public float getFloat(String name, float defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Float.parseFloat(val); } public double getDouble(String name, double defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Double.parseDouble(val); } public byte getByte(String name, byte defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Byte.parseByte(val); } public Configuration() { InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream("config.xml"); try { this.loadFromXML(in); in.close(); } catch (IOException ioe) { } }} |
五、测试
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import Model.Message;import Utils.JedisUtil;import Utils.ObjectUtil;import redis.clients.jedis.Jedis;import java.io.IOException;/** * Created by Kinglf on 2016/10/17. */public class TestRedisQueue { public static byte[] redisKey = "key".getBytes(); static { try { init(); } catch (IOException e) { e.printStackTrace(); } } private static void init() throws IOException { for (int i = 0; i < 1000000; i++) { Message message = new Message(i, "这是第" + i + "个内容"); JedisUtil.lpush(redisKey, ObjectUtil.object2Bytes(message)); } } public static void main(String[] args) { try { pop(); } catch (Exception e) { e.printStackTrace(); } } private static void pop() throws Exception { byte[] bytes = JedisUtil.rpop(redisKey); Message msg = (Message) ObjectUtil.bytes2Object(bytes); if (msg != null) { System.out.println(msg.getId() + "----" + msg.getContent()); } }} |
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每执行一次pop()方法,结果如下:<br>1----这是第1个内容<br>2----这是第2个内容<br>3----这是第3个内容<br>4----这是第4个内容 |
总结
至此,整个Redis消息队列的生产者和消费者代码已经完成
1.Message 需要传送的实体类(需实现Serializable接口)
2.Configuration Redis的配置读取类,继承自Properties
3.ObjectUtil 将对象和byte数组双向转换的工具类
4.Jedis 通过消息队列的先进先出(FIFO)的特点结合Redis的list中的push和pop操作进行封装的工具类
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/kinglf/p/5972300.html
