search
HomeJavajavaTutorialSpecific analysis of how Java uses Redis to implement message queues

Specific analysis of how Java uses Redis to implement message queues

黄舟
黄舟
Jul 24, 2017 pm 03:39 PM
javaredisaccomplish

This article mainly introduces the sample code of Java using Redis to implement message queue. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

This article introduces the sample code of Java using Redis to implement message queue, and shares it with everyone. The details are as follows:

Application scenarios

Why use redis?

Binary storage, java serialized transmission, high number of IO connections, frequent connections

1. Serialization

A java serialization tool is written here, which mainly converts objects into byte arrays and deserializes them into java objects based on byte arrays; mainly using ByteArrayOutputStream and ByteArrayInputStream ; Note: Every object that needs to be serialized must implement the Serializable interface;

The code is as follows:


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();
 }
}

2. Message class (implementing Serializable interface)


##

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;
 }
}

3. Redis operation

Using redis as a queue, we use the push and pop operations of the list in redis;


Combined with the characteristics of the queue:

Only allowed to insert new elements at one end only at the end of the queue FIFO: first in first out principle In Redis, lpush head in (rpop tail out) or rpush tail in (lpop head out) can be To meet the requirements, the list medicine push or pop objects in Redis only need to be converted into byte[]

java uses Jedis for Redis storage and Redis connection pool settings

Code above: 


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;
 }
}

Fourth, Configuration is mainly used to read Redis configuration information


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) {

  }
 }
}

5. Test


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());
  }
 }
}


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

Summary

At this point, the producer and consumer code of the entire Redis message queue has been completed


1 .Message The entity class that needs to be transmitted (needs to implement the Serializable interface)


2.Configuration Redis configuration reading class, inherited from Properties


3.ObjectUtil combines the object and Tool class for bidirectional conversion of byte arrays


4.Jedis is a tool class that uses the first-in-first-out (FIFO) characteristics of the message queue and combines the push and pop operations in the Redis list

The above is the detailed content of Specific analysis of how Java uses Redis to implement message queues. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Related Article
JVM performance vs other languagesJVM performance vs other languagesMay 14, 2025 am 12:16 AM

JVM'sperformanceiscompetitivewithotherruntimes,offeringabalanceofspeed,safety,andproductivity.1)JVMusesJITcompilationfordynamicoptimizations.2)C offersnativeperformancebutlacksJVM'ssafetyfeatures.3)Pythonisslowerbuteasiertouse.4)JavaScript'sJITisles

Java Platform Independence: Examples of useJava Platform Independence: Examples of useMay 14, 2025 am 12:14 AM

JavaachievesplatformindependencethroughtheJavaVirtualMachine(JVM),allowingcodetorunonanyplatformwithaJVM.1)Codeiscompiledintobytecode,notmachine-specificcode.2)BytecodeisinterpretedbytheJVM,enablingcross-platformexecution.3)Developersshouldtestacross

JVM Architecture: A Deep Dive into the Java Virtual MachineJVM Architecture: A Deep Dive into the Java Virtual MachineMay 14, 2025 am 12:12 AM

TheJVMisanabstractcomputingmachinecrucialforrunningJavaprogramsduetoitsplatform-independentarchitecture.Itincludes:1)ClassLoaderforloadingclasses,2)RuntimeDataAreafordatastorage,3)ExecutionEnginewithInterpreter,JITCompiler,andGarbageCollectorforbytec

JVM: Is JVM related to the OS?JVM: Is JVM related to the OS?May 14, 2025 am 12:11 AM

JVMhasacloserelationshipwiththeOSasittranslatesJavabytecodeintomachine-specificinstructions,managesmemory,andhandlesgarbagecollection.ThisrelationshipallowsJavatorunonvariousOSenvironments,butitalsopresentschallengeslikedifferentJVMbehaviorsandOS-spe

Java: Write Once, Run Anywhere (WORA) - A Deep Dive into Platform IndependenceJava: Write Once, Run Anywhere (WORA) - A Deep Dive into Platform IndependenceMay 14, 2025 am 12:05 AM

Java implementation "write once, run everywhere" is compiled into bytecode and run on a Java virtual machine (JVM). 1) Write Java code and compile it into bytecode. 2) Bytecode runs on any platform with JVM installed. 3) Use Java native interface (JNI) to handle platform-specific functions. Despite challenges such as JVM consistency and the use of platform-specific libraries, WORA greatly improves development efficiency and deployment flexibility.

Java Platform Independence: Compatibility with different OSJava Platform Independence: Compatibility with different OSMay 13, 2025 am 12:11 AM

JavaachievesplatformindependencethroughtheJavaVirtualMachine(JVM),allowingcodetorunondifferentoperatingsystemswithoutmodification.TheJVMcompilesJavacodeintoplatform-independentbytecode,whichittheninterpretsandexecutesonthespecificOS,abstractingawayOS

What features make java still powerfulWhat features make java still powerfulMay 13, 2025 am 12:05 AM

Javaispowerfulduetoitsplatformindependence,object-orientednature,richstandardlibrary,performancecapabilities,andstrongsecurityfeatures.1)PlatformindependenceallowsapplicationstorunonanydevicesupportingJava.2)Object-orientedprogrammingpromotesmodulara

Top Java Features: A Comprehensive Guide for DevelopersTop Java Features: A Comprehensive Guide for DevelopersMay 13, 2025 am 12:04 AM

The top Java functions include: 1) object-oriented programming, supporting polymorphism, improving code flexibility and maintainability; 2) exception handling mechanism, improving code robustness through try-catch-finally blocks; 3) garbage collection, simplifying memory management; 4) generics, enhancing type safety; 5) ambda expressions and functional programming to make the code more concise and expressive; 6) rich standard libraries, providing optimized data structures and algorithms.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Show More

Hot Article

How to fix KB5055612 fails to install in Windows 10?
4 weeks agoByDDD
Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Roblox: Grow A Garden - Complete Mutation Guide
3 weeks agoByDDD
Nordhold: Fusion System, Explained
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Show More

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Show More

Hot Topics

Java Tutorial
1671
14
CakePHP Tutorial
1428
52
Laravel Tutorial
1331
25
PHP Tutorial
1276
29
C# Tutorial
1256
24
Show More