使用java代码操作Redis

2023-08-16 10:05:34

1导入pom.xml依赖

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

2，Java代码操作一下存值取值

public class demo1 {
    public static void main(String[] args) {
        Jedis Jedis = new Jedis("192.168.171.129", 6379);
        Jedis.auth("123456");
//         System.out.println(Jedis.ping());

        //选择数据库
        String select = Jedis.select(0);

        //Strng 字符串
        //set
//        Jedis.set("name","张三");
        //get获取
        //System.out.println(Jedis.get("name"));
        //type获取类型
        //System.out.println(Jedis.type("name"));
        //del删除
        //Jedis.del("name");
        //expire设置超时时间
        //Jedis.expire("name",10);

        //hash(哈希)

//        Jedis.hset("student","name","李四");
//        Jedis.hset("student","age","13");
//        Jedis.hset("student","addres","长沙");

//        System.out.println(Jedis.hget("student", "name"));

        //list列表
//        Jedis.lpush("names","张三","李四","王五");
//        Long names = Jedis.llen("names");
//        for (int i=0;i<names;i++){
////        从左到右
//             System.out.println(Jedis.lpop("names"));
////        从左到右
//        System.out.println(Jedis.rpop("names"));
//         }


        //set集合
//         Jedis.sadd("username","admin","zs","ls");
//        ScanResult<String> username = Jedis.sscan("username", 0);
//        List<String> result = username.getResult();
//        for (String s : result) {
//            System.out.println(s);
//        }

        //zset有序集合
//        Jedis.zadd("sex",70,"男");
//        Jedis.zadd("sex",80,"女");
//        Jedis.zadd("sex",90,"不男不女");
//        ScanResult<Tuple> zscan = Jedis.zscan("sex", 0);
//        List<Tuple> result = zscan.getResult();
//        for (Tuple tuple : result) {
//            System.out.println("sex="+tuple.getElement()+",score="+tuple.getScore());
//
//        }

    }
}

DemoServerlet.java

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;

@WebServlet("/list")
public class DemoServerlet 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("192.168.171.129", 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("/bookList.jsp").forward(req,resp);
        }
    }

}

bookList.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${mag}:${booklist}

</body>
</html>

今天就到这里了谢谢大家！

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