添加依赖：

 

           
        
         com.fasterxml.jackson.core
            
        
         jackson-databind
            
        
         2.9.7
        
        
               
                   
        
         org.springframework.data
                    
        
         spring-data-redis
                    
        
         2.1.3.RELEASE
         
       

 

 

Mapper接口：

package com.nf147.sim.mapper;import com.nf147.sim.entity.News;import java.util.List;public interface NewsMapper {    List
       
         query();    void add(News news);}
       

 

 

映射文件：

       
           
                
                 
                 
             
            
                select id ,title,body from news        
                  select id ,title,body from news        
        
                 insert into news (title,body) values (#{title},#{body})    
        
       

 

服务接口：

package com.nf147.sim.service;import com.nf147.sim.entity.News;import redis.clients.jedis.Jedis;import java.io.IOException;import java.util.List;public interface NewsService {    List
       
         selectAll() throws IOException;void add (News news);}
       

 

实现：

package com.nf147.sim.service.impl;import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.ObjectMapper;import com.nf147.sim.entity.News;import com.nf147.sim.mapper.NewsMapper;import com.nf147.sim.service.NewsService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import redis.clients.jedis.Jedis;import java.io.IOException;import java.util.List;@Servicepublic class NewsServiceImpl implements NewsService {    @Autowired    private NewsMapper mapper;    @Override        public List
       
         selectAll() throws IOException {            Jedis jedis =new Jedis();            String key = "listNews";            ObjectMapper on = new ObjectMapper();  //josn        if (jedis.exists(key)){    　　　　　　　　　　　　//判断缓存有没有存在key            System.out.println("从缓存中取出数据...");            return on.readValue(jedis.get(key),new TypeReference
        
         
          >(){});  //如果有就从缓存里面取数据        }　　　　　//没有则从数据库去取        List
          
            news = mapper.query();        jedis.set(key,on.writeValueAsString(news));  //然后设置键和数据        return news;                                //返回    }    @Override    public void add(News news) {  //每次添加时判短键是否存在，如果存在首先删除        Jedis jedis = new Jedis();        String key="listNews";        if(jedis.exists(key))            jedis.del(key);        mapper.add(news);    }}
          
         
        
       

 

测试：

package com.nf147.sim.service.impl;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.ObjectMapper;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import com.nf147.sim.configuration.RootConfig;import com.nf147.sim.entity.News;import com.nf147.sim.mapper.NewsMapper;import com.nf147.sim.service.NewsService;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringRunner;import redis.clients.jedis.Jedis;import java.io.*;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.Arrays;import java.util.List;@RunWith(SpringRunner.class)@ContextConfiguration(classes = RootConfig.class)public class NewsServiceImplTest {    @Autowired    private NewsServiceImpl NewsServiceImpl;    @Test    public void selectAll() throws IOException {        List
       
         news = NewsServiceImpl.selectAll();        System.out.println(news);    }    }}
       

 

结果：转存失败