Diana456

Java利用Redis实现消息队列

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;

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)

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

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();