redis實現分頁技術
阿新 • • 發佈：2018-11-27
宣告:原部落格在這裡https://www.cnblogs.com/find-the-right-direction/p/8465011.html，謝謝哥們提供，尊重原創。
本人是在原有的springboot2.0專案中實現，其中Jedis jar包可以在這裡下載，當然你也可以在pom.xml中新增 spring-boot-starter-data-redis
1、先在redis中插入資料，所以新建一個RedisUtil.java
package com.cn.commodity.utils; import org.junit.jupiter.api.Test; import org.springframework.boot.autoconfigure.data.redis.RedisProperties;import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; public class RedisUtil { @Test public void testJedisPool1(){ Jedis jedis = new Jedis("localhost",6379); try { for (int i = 1; i <= 100000; i++) { jedis.rpush("nameList","zl"+i); }} catch (Exception e) { e.printStackTrace(); } finally { if (jedis != null){ jedis.close(); } } } }
2、新建PagingController.java
package com.cn.commodity.controller; import org.springframework.stereotype.Controller;import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.exceptions.JedisException; import javax.sound.midi.Soundbank; import java.util.List; @RequestMapping("/redisPage") @Controller public class PagingController { @RequestMapping("/paging") public String paging(Model model, Long currentPage){ //create a simple and not-safe pool Jedis jedis = new Jedis("localhost",6379); try { //total long total = jedis.llen("nameList"); //size long size = 10L; if (total/size==0){ total = total/size; }else { total = total/size + 1; } // set currentPage currentPage = currentPage==null?0L:currentPage; System.out.println(total); List<String> nameList = jedis.lrange("nameList",currentPage*size,(currentPage+1)*size); model.addAttribute("nameList",nameList); model.addAttribute("total",total); model.addAttribute("currentPage",currentPage); for (String name : nameList) { System.out.println(name); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (jedis != null){ jedis.close(); } }catch (JedisException e){ e.printStackTrace(); } } return "redisPaging"; } }
3、寫一個redisPaging.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page isELIgnored="false" %> <html> <head> <title>測試</title> </head> <style> ul{ list-style: none; float: left; } li{ width: 50px; height: 50px; } </style> <script type="text/javascript" src="${pageContext.request.contextPath}/assets/js/jquery.min.js"></script> <body> <form action="${pageContext.request.contextPath}/milu/paging"> 按頁數查詢：<input class="pageNum" name="currentPage" maxlength="10" value="輸入要查詢的頁數"> <input type="submit" value="查詢"><br><hr> </form> <strong>使用者名稱稱：</strong><br><hr> <ul> <c:forEach items="${nameList}" var="n"> <li>${n}</li> </c:forEach> </ul> <br><hr> <a href="${pageContext.request.contextPath}/milu/paging?currentPage=${currentPage-1}">上一頁</a> 當前第${currentPage+1}頁，共${total}頁 <a href="${pageContext.request.contextPath}/milu/paging?currentPage=${currentPage+1}">下一頁</a> </body> </html>
如果已經執行了步驟一，那麼可以直接啟動整個專案，輸入http://localhost:8080/redisPage/paging，就可以看到介面了。
很簡單吧！
記住！本地redis服務要先啟動。