基于Java代码操作Redis过程详解

时间:2021-04-02 人气:0

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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