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

Jedis jedis = new Jedis(ip, port);
      jedis.auth("123456");//权限认证
      jedis.ping();
      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

 string（字符串）
      hash（哈希）
      list（列表）
      set（集合）
      zset(sorted set：有序集合)
        zadd/zrevrange

Demo01

package com.MavenRedis;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.ScanResult;
import redis.clients.jedis.Tuple;

import java.util.List;

/**
 * @author  XuFanQi
 * @site XUFANQI
 * @company xxx
 * @create  2019-10-13 10:57
 */
public class Demo {
    public static void main(String[] args) {
        Jedis Jedis = new Jedis("192.168.183.128", 6379);
        Jedis.auth("xiaoqi123");
         System.out.println(Jedis.ping());

        //选择数据库
        String select = Jedis.select(0);
       // Jedis.del("booklist");
        //Strng 字符串
        //set
        //Jedis.set("name","zs");
        //get获取
        System.out.println(Jedis.get("booklist"));
        //type获取类型
        //System.out.println(Jedis.type("name"));
        //del删除
        //Jedis.del("name");
        //expire设置超时时间
        //Jedis.expire("name",10);

        //hash(哈希)

//        Jedis.hset("student","name","ls");
//        Jedis.hset("student","age","13");
//        Jedis.hset("student","addres","cx");

//        System.out.println(Jedis.hget("student", "name"));

        //list列表
//        Jedis.lpush("names","zs","ls","ww");
//        Long names = Jedis.llen("names");
//        for (int i=0;i<names;i++){
        //从左到右
        //     System.out.println(Jedis.lpop("names"));
        //从左到右
        //System.out.println(Jedis.rpop("names"));
   // }


        //set集合
       // Jedis.sadd("username","admin","zs","ls");
//        ScanResult<String> username = Jedis.sscan("username", 0);
//        List<String> result = username.getResult();
//        for (String s : result) {
//            System.out.println(s);
//        }

        //zset有序集合
//        Jedis.zadd("sex",70,"男");
//        Jedis.zadd("sex",80,"女");
//        Jedis.zadd("sex",90,"不男不女");
//        ScanResult<Tuple> zscan = Jedis.zscan("sex", 0);
//        List<Tuple> result = zscan.getResult();
//        for (Tuple tuple : result) {
//            System.out.println("sex="+tuple.getElement()+",score="+tuple.getScore());
//
//        }


    }
}

增删改中的使用

 DemoServerlet.java

import redis.clients.jedis.Jedis;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/list")
public class DemoServerlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Jedis jedis = new Jedis("192.168.183.128", 6379);
        jedis.auth("xiaoqi123");
        String booklist=jedis.get("bookList");
        if(booklist==null || "".equals(booklist)){
            //模拟实际项目开发需求，在项目中运用redis
            //查询数据库
            String mysqldata="data";
            //将mysqldata数据源转成json数组串
            jedis.set("booklist",mysqldata);
            booklist = jedis.get("booklist");
            req.setAttribute("mag","走了数据库数据");
            req.setAttribute("booklist",booklist);
            req.getRequestDispatcher("/booklist.jsp").forward(req,resp);
        }else{
            req.setAttribute("mag","直接从redis里面拿了数据");
            req.setAttribute("booklist",booklist);
            req.getRequestDispatcher("/bookList.jsp").forward(req,resp);
        }
    }

}