使用java代码操作redis
Java访问redis
添加依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.MavenRedis</groupId>
<artifactId>RedisProject</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>RedisProject Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
</dependencies>
<build>
<finalName>RedisProject</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
Java连接redis
1 Jedis jedis = new Jedis(ip, port); 2 jedis.auth("123456");//权限认证 3 jedis.ping(); 4 jedis.select(0);//切换数据库
使用java代码操作redis
查询中使用redis的逻辑
edis在增删改中的使用
存值取值
1 string（字符串） 2 hash（哈希） 3 list（列表） 4 set（集合） 5 zset(sorted set：有序集合) 6 zadd/zrevrange
Demo01
1 package com.MavenRedis; 2 3 import redis.clients.jedis.Jedis; 4 import redis.clients.jedis.ScanResult; 5 import redis.clients.jedis.Tuple; 6 7 import java.util.List; 8 9 /** 10 * @author XuFanQi 11 * @site XUFANQI 12 * @company xxx 13 * @create 2019-10-13 10:57 14 */ 15 public class Demo { 16 public static void main(String[] args) { 17 Jedis Jedis = new Jedis("192.168.183.128", 6379); 18 Jedis.auth("xiaoqi123"); 19 System.out.println(Jedis.ping()); 20 21 //选择数据库 22 String select = Jedis.select(0); 23 // Jedis.del("booklist"); 24 //Strng 字符串 25 //set 26 //Jedis.set("name","zs"); 27 //get获取 28 System.out.println(Jedis.get("booklist")); 29 //type获取类型 30 //System.out.println(Jedis.type("name")); 31 //del删除 32 //Jedis.del("name"); 33 //expire设置超时时间 34 //Jedis.expire("name",10); 35 36 //hash(哈希) 37 38 // Jedis.hset("student","name","ls"); 39 // Jedis.hset("student","age","13"); 40 // Jedis.hset("student","addres","cx"); 41 42 // System.out.println(Jedis.hget("student", "name")); 43 44 //list列表 45 // Jedis.lpush("names","zs","ls","ww"); 46 // Long names = Jedis.llen("names"); 47 // for (int i=0;i<names;i++){ 48 //从左到右 49 // System.out.println(Jedis.lpop("names")); 50 //从左到右 51 //System.out.println(Jedis.rpop("names")); 52 // } 53 54 55 //set集合 56 // Jedis.sadd("username","admin","zs","ls"); 57 // ScanResult<String> username = Jedis.sscan("username", 0); 58 // List<String> result = username.getResult(); 59 // for (String s : result) { 60 // System.out.println(s); 61 // } 62 63 //zset有序集合 64 // Jedis.zadd("sex",70,"男"); 65 // Jedis.zadd("sex",80,"女"); 66 // Jedis.zadd("sex",90,"不男不女"); 67 // ScanResult<Tuple> zscan = Jedis.zscan("sex", 0); 68 // List<Tuple> result = zscan.getResult(); 69 // for (Tuple tuple : result) { 70 // System.out.println("sex="+tuple.getElement()+",score="+tuple.getScore()); 71 // 72 // } 73 74 75 } 76 }
增删改中的使用
DemoServerlet.java
1 import redis.clients.jedis.Jedis; 2 3 import javax.servlet.ServletException; 4 import javax.servlet.annotation.WebServlet; 5 import javax.servlet.http.HttpServlet; 6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpServletResponse; 8 import java.io.IOException; 9 10 @WebServlet("/list") 11 public class DemoServerlet extends HttpServlet { 12 @Override 13 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 14 doPost(req,resp); 15 } 16 17 @Override 18 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 19 Jedis jedis = new Jedis("192.168.183.128", 6379); 20 jedis.auth("xiaoqi123"); 21 String booklist=jedis.get("bookList"); 22 if(booklist==null || "".equals(booklist)){ 23 //模拟实际项目开发需求，在项目中运用redis 24 //查询数据库 25 String mysqldata="data"; 26 //将mysqldata数据源转成json数组串 27 jedis.set("booklist",mysqldata); 28 booklist = jedis.get("booklist"); 29 req.setAttribute("mag","走了数据库数据"); 30 req.setAttribute("booklist",booklist); 31 req.getRequestDispatcher("/booklist.jsp").forward(req,resp); 32 }else{ 33 req.setAttribute("mag","直接从redis里面拿了数据"); 34 req.setAttribute("booklist",booklist); 35 req.getRequestDispatcher("/bookList.jsp").forward(req,resp); 36 } 37 } 38 39 }