基於Java程式碼操作Redis過程詳解

阿新 • • 發佈：2020-11-19

Jedis簡介

實際開發中，我們需要用Redis的連線工具連線Redis然後操作Redis，

對於主流語言，Redis都提供了對應的客戶端；

提供了很多客戶端官方推薦的是Jedis 託管地址：https://github.com/xetorthio/jedis

要使用redis首先得下載pom依賴

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

連線redis

Jedis jedis = new Jedis("192.168.234.131",6379);
jedis.auth("123456");
//jedis.close(); //使用完關閉連
System.out.println(jedis.ping());

使用Jedis連線池之後，在每次用完連線物件後一定要記得把連線歸還給連線池。Jedis對close方法進行了改造，如果是連線池中的連線物件，呼叫Close方法將會是把連線物件返回到物件池，若不是則關閉連線。

操作Redis常用的三種資料型別，還有兩種不常用的就不介紹了

package com.wp;
import redis.clients.jedis.Jedis;
/**
* @author 小李飛刀
* @site www.xiaomage.com
* @company zhuojing
* @create 2019-10-13 10:43
*/
public class javaDome {
	public static void main(String[] args) {
		//連結操作
		Jedis jedis = new Jedis("192.168.234.131",6379);
		jedis.auth("123456");
		System.out.println(jedis.ping());
		//操作字串
		jedis.set("aaa","張三");
		System.out.println(jedis.get("aaa"));
		//對雜湊進行操作
		jedis.hset("user1","uname","李四");
		jedis.hset("user1","sex","男");
		System.out.println(jedis.hgetAll("user1"));
		System.out.println(jedis.hget("user1", "uname"));
		//對list進行操作
		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"));
	}
}

專案中的應用演示例子

查詢中使用redis的邏輯

如圖所示：

bookservlet.java

程式碼如下：

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 小李飛刀
* @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)){
			//模擬實際專案開發需求，在專案中運用redis
			//查詢資料庫
			String mysqldata="data";
			//將mysqldata資料來源轉成json陣列串
			jedis.set("booklist",mysqldata);
			booklist = jedis.get("booklist");
			req.setAttribute("mag","走了資料庫資料");
			req.setAttribute("booklist",booklist);
			req.getRequestDispatcher("/booklist.jsp").forward(req,resp);
		} else{
			req.setAttribute("mag","直接從redis裡面拿了資料");
			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>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援碼農教程。