使用java代码操作redis
查询中使用redis逻辑
redis在增删改查中的使用
1. Java访问redis
2.1 添加依赖 <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency>
2.2 Java连接redis
Jedis jedis = new Jedis(ip, port);
jedis.auth("123456");//权限认证
jedis.ping();
jedis.select(0);//切换数据库
Demo01
package com.zl;
import redis.clients.jedis.Jedis;
/**
* @author zhuling
* @site www.xiaomage.com
* @company xxx公司
* @create 2019-10-13 19:25
*
*
* 讲解java代码操作redis
* 包括string、hash、list
*
* 1、加载驱动
* 2、建立连接（url、uname、pwd）
* 3、prepatestatement
* 4、执行sql
* 5、处理结果
* 6、关闭资源
*
*
* redis连接步骤
* 1、建立连接、连接后授权
* 2、使用redis
*
*/
public class Demo1 {
public static void main(String[] args) {
Jedis jedis=new Jedis("192.168.142.128",6379);
jedis.auth("123456");
System.out.println(jedis.ping());
/**
* string
*/
// jedis.set("name","zs");
// jedis.set("age","22");
// System.out.println(jedis.get("name"));
/**
* hash
*/
// jedis.hset("user1","uname","ls");
// jedis.hset("user1","pwd","123456");
// jedis.hset("user1","set","nv");
// System.out.println(jedis.hget("user1", "uname"));
// Map<String, String> user1 = jedis.hgetAll("user1");
// for (Map.Entry<String, String> entry : user1.entrySet()) {
// System.out.println("key:" + entry.getKey() + ",value:" + entry.getValue());
// }
/**
* list left
*/
// jedis.lpush("hobby","a","b","c","d","e","f","g");
// System.out.println(jedis.lpop("hobby"));
}
}
DemoServerlet
package com.zl;
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 zhuling
* @site www.xiaomage.com
* @company xxx公司
* @create 2019-10-13 23:08
*
*
* redis 在项目中的使用
* 查询
* 增删改
*/
@WebServlet("/list")
public class DemoServlet 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("192.168.142.128",6379);
jedis.auth("123456");
String bookList = jedis.get("bookList");
if(null==bookList ||"".equals(bookList)){
//查询数据库
String mysqlData="data";
//将mysqldata转成json数组串
jedis.set("booList",mysqlData);
bookList = jedis.get("bookList");
req.setAttribute("msg","走了数据库拿数据");
req.setAttribute("bookList","boohList");
req.getRequestDispatcher("/bookList.jsp").forward(req,resp);
}else{
req.setAttribute("msg","直接聪redis中取数据");
req.setAttribute("bookList","boohList");
req.getRequestDispatcher("/bookList.jsp").forward(req,resp);
}
}
}
bookList
注意这一段 <%@ page isELIgnored="false" %>
<%--
Created by IntelliJ IDEA.
User: 2018111801
Date: 2019/10/13
Time: 23:33
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>
${msg}:${bookList}
</body>
</html>
原文地址：https://www.cnblogs.com/BAYOUA/p/11669173.html
时间： 2024-08-04 16:04:56