基于Java代码操作Redis过程详解

2019-11-26 08:29:28

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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 {	@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("192.168.234.131",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: machenike	Date: 2019/10/13 Time: 11:53 To change this	template 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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