基于Java代码操作Redis过程详解
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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