redis实现消息队列-java代码实现

转：https://blog.csdn.net/qq_42175986/article/details/88576849

pom.xml

<!-- redis依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
</dependency>
<!-- redis依赖 -->

application.yml

spring:
  application:
      name: yys-redismq
  redis:
    host: 127.0.0.1
    port:
    password:
    pool:
      max-active:
      max-idle:
      min-idle:
      max-wait:
    timeout:
    database: 

server:
    port:
    tomcat:
        uri-encoding: UTF-

RedisConfig.java

package com.yys.demo.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import redis.clients.jedis.JedisPoolConfig;

/**
 * 描述：redis配置类
 * @author yys
 * @date 2019.03.15
 */
@Configuration
public class RedisConfig {

    /** redis 服务器地址 */
    @Value("${spring.redis.host}")
    private String host;

    /** redis 端口号 */
    @Value("${spring.redis.port}")
    private int port;

    /** redis 服务器密码 */
    @Value("${spring.redis.password}")
    private String password;

    /** redis 连接池最大连接数(使用负值无限制) */
    @Value("${spring.redis.pool.max-active}")
    private int maxActive;

    /** redis 连接池最大空闲数 */
    @Value("${spring.redis.pool.max-idle}")
    private int maxIdle;

    /** redis 连接池小空闲数 */
    @Value("${spring.redis.pool.min-idle}")
    private int minIdle;

    /** redis 连接池最大阻塞等待时间(负值无限制) */
    @Value("${spring.redis.pool.max-wait}")
    private int maxWait;

    /** redis 数据库索引(默认0) */
    @Value("${spring.redis.database}")
    private int database;

    /** redis 超时时间 */
    @Value("${spring.redis.timeout}")
    private int timeout;

    @Bean
    public JedisPoolConfig getRedisConfig(){
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxTotal(maxActive);
        config.setMaxIdle(maxIdle);
        config.setMinIdle(minIdle);
        config.setMaxWaitMillis(maxWait);
        return config;
    }

    @Bean
    public JedisConnectionFactory getConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName(host);
        factory.setPort(port);
        factory.setPassword(password);
        factory.setDatabase(database);
        JedisPoolConfig config = getRedisConfig();
        factory.setPoolConfig(config);
        return factory;
    }

    @Bean
    public RedisTemplate<?, ?> getRedisTemplate() {
        JedisConnectionFactory factory = getConnectionFactory();
        RedisTemplate<?, ?> redisTemplate = new StringRedisTemplate(factory);
        return redisTemplate;
    }

}

RedisClient.java

package com.yys.demo.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * 描述：redis工具类(本配置类只有redis消息队列相关命令方法)
 * @author yys
 * @date 2019.03.15
 */
@Component
public class RedisClient {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    /** ---------------------------------- redis消息队列 ---------------------------------- */
    /**
     * 存值
     * @param key 键
     * @param value 值
     * @return
     */
    public boolean lpush(String key, Object value) {
        try {
            redisTemplate.opsForList().leftPush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 取值 - <rpop：非阻塞式>
     * @param key 键
     * @return
     */
    public Object rpop(String key) {
        try {
            return redisTemplate.opsForList().rightPop(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 取值 - <brpop：阻塞式> - 推荐使用
     * @param key 键
     * @param timeout 超时时间
     * @param timeUnit 给定单元粒度的时间段
     *                 TimeUnit.DAYS          //天
     *                 TimeUnit.HOURS         //小时
     *                 TimeUnit.MINUTES       //分钟
     *                 TimeUnit.SECONDS       //秒
     *                 TimeUnit.MILLISECONDS  //毫秒
     * @return
     */
    public Object brpop(String key, long timeout, TimeUnit timeUnit) {
        try {
            return redisTemplate.opsForList().rightPop(key, timeout, TimeUnit.SECONDS);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 查看值
     * @param key 键
     * @param start 开始
     * @param end 结束 0 到 -1代表所有值
     * @return
     */
    public List<Object> lrange(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /** ---------------------------------- redis消息队列 ---------------------------------- */

}

RedisProducerController.java

package com.yys.demo.controller;

import com.yys.demo.config.RedisClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.List;

/**
 * 描述：生产者(消息发送方)
 * @author yys
 * @date 2019.03.15
 */
@RestController
@RequestMapping("/producer")
public class RedisProducerController {

    @Autowired
    RedisClient redisClient;

    /** 公共配置 */
    private final static String SUCCESS = "success";
    private final static String MESSAGE = "testmq";
    private static final List<String> list;

    static {
        list = Arrays.asList(new String[]{"猿医生", "CD", "yys"});
    }

    /**
     * 消息发送API
     * @return
     */
    @RequestMapping("/sendMessage")
    public String sendMessage() {
        for (String message : list) {
            redisClient.lpush(MESSAGE, message);
        }
        return SUCCESS;
    }

}

RedisConsumerController.java

package com.yys.demo.controller;

import com.yys.demo.config.RedisClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.TimeUnit;

/**
 * 描述：消费者(消息接收方)
 * @author yys
 * @date 2019.03.15
 */
@RestController
@RequestMapping("/consumer")
public class RedisConsumerController {

    @Autowired
    RedisClient redisClient;

    /** 公共配置 */
    private final static String MESSAGE = "testmq";

    /**
     * 接收消息API
     * @return
     */
    @RequestMapping("/receiveMessage")
    public String sendMessage() {
        return (String) redisClient.brpop(MESSAGE, 0, TimeUnit.SECONDS);
    }

}

注：批量消费消息例子如下

package com.cashloan.analytics.controller;

import com.cashloan.analytics.model.DcProjectCount;
import com.cashloan.analytics.utils.RedisQueue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

@RestController
@RequestMapping("/test")
public class Test {
    @Autowired
    private RedisQueue redisQueue;

    /** 公共配置 */
    private final static String MESSAGE = "testmq";

    @RequestMapping("/send")
    public String sendMessage(String[] strs) {
        List<String> str = Arrays.asList(strs);
        for (String msg : str) {
            DcProjectCount dcProjectCount = new DcProjectCount();
            dcProjectCount.setId(Long.valueOf(msg));
            redisQueue.lpush(MESSAGE, dcProjectCount);
        }
        return "1";
    }

    @GetMapping("/see")
    public List<Object> see() {
        List<Object> lrange = redisQueue.lrange(MESSAGE, 0, -1);
        return lrange;
    }

    @GetMapping("/get")
    public Object get() {
        List<Object> lrange = redisQueue.lrange(MESSAGE, 0, -1);
        int size = lrange.size();
        System.out.println("size:" + size);
        if (size >= 10) {
            List<DcProjectCount> dcProjectCounts = new ArrayList<>();
            for (int i = 0; i < size; i++) {
                Object brpop = redisQueue.brpop(MESSAGE, 0, TimeUnit.SECONDS);
                if (brpop != null) {
                    dcProjectCounts.add((DcProjectCount) brpop);
                }
            }
            for (DcProjectCount dcProjectCount : dcProjectCounts) {
                System.out.println(dcProjectCount.getId());
            }
        }
        return "true";
    }
}

DcProjectCount类只要设置private Long id并添加set、get方法即可！