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基于Java代码操作Redis过程详解

2020年02月13日 编程语言 ⁄ 共 2917字 ⁄ 字号 评论关闭

Jedis简介

实际开发中,我们需要用Redis的连接工具连接Redis然后操作Redis,

对于主流语言,Redis都提供了对应的客户端;

提供了很多客户端 官方推荐的是Jedis 托管地址:https://github.com/xetorthio/jedis

要使用redis首先得下载pom依赖

<dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.9.0</version></dependency>

连接redis

Jedis jedis = new Jedis("192.168.234.131",6379);jedis.auth("123456");//jedis.close(); //使用完关闭连System.out.println(jedis.ping());

使用Jedis连接池之后,在每次用完连接对象后一定要记得把连接归还给连接池。Jedis对close方法进行了改造,如果是连接池中的连接对象,调用Close方法将会是把连接对象返回到对象池,若不是则关闭连接。

操作Redis常用的三种数据类型 ,还有两种不常用的就不介绍了

package com.wp;import redis.clients.jedis.Jedis;/*** @author 小李飞刀* @site www.xiaomage.com* @company zhuojing* @create 2019-10-13 10:43*/public class javaDome {public static void main(String[] args) {//链接操作Jedis jedis = new Jedis("192.168.234.131",6379);jedis.auth("123456");System.out.println(jedis.ping());//操作字符串jedis.set("aaa","张三");System.out.println(jedis.get("aaa"));//对哈希进行操作jedis.hset("user1","uname","李四");jedis.hset("user1","sex","男");System.out.println(jedis.hgetAll("user1"));System.out.println(jedis.hget("user1", "uname"));//对list进行操作jedis.lpush("hobby","a","b","c","d","e","f");System.out.println(jedis.lpop("hobby"));System.out.println(jedis.lpop("hobby"));System.out.println(jedis.rpop("hobby"));}}

项目中的应用演示例子

查询中使用redis的逻辑

如图所示:

bookservlet.java

代码如下:

package web;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;/*** @author 小李飞刀* @site www.xiaomage.com* @company zhuojing* @create 2019-10-13 10:43*/@WebServlet("/wp")public class Bookservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doPost(req,resp);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Jedis jedis = new Jedis("192.168.234.131",6379);jedis.auth("123456");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("/index.jsp").forward(req,resp);}}}

index.jsp

<html><body><h2>Hello World!</h2><%-- Created by IntelliJ IDEA. User: machenikeDate: 2019/10/13 Time: 11:53 To change thistemplate use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8"language="java" %><%@ page isELIgnored="false" %><html><head><title>Title</title></head><body>${mag}:${booklist}</body></html>

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