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SpringBoot Redis批量存取数据的操作

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SpringBoot Redis批量存取数据

springboot中的redisTemplate封装了redis批处理数据的接口,我们使用redisTemplate可以直接进行批量数据的get和set.

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package com.huateng.applacation.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import java.util.List;
 
/**
  * @program: applacation
  * @description:
  * @author: daiwenlong
  * @create: 2019-01-24 13:26
  **/
@Component
public class RedisService { 
     @Autowired
     @Qualifier ( "stringRedisTemplate" )
     private StringRedisTemplate redisTemplate;
     public void insertKey(List<String> keys, String value){
 
         //批量get数据
         List<Object> list = redisTemplate.executePipelined( new RedisCallback<String>() {
             @Override
             public String doInRedis(RedisConnection connection) throws DataAccessException {
                 for (String key : keys) {
                     connection.get(key.getBytes());
                 }
                 return null ;
             }
         });
 
         //批量set数据
         redisTemplate.executePipelined( new RedisCallback<String>() {
             @Override
             public String doInRedis(RedisConnection connection) throws DataAccessException {
                 for ( int i= 0 ;i<keys.size();i++) {
                     connection.set(keys.get(i).getBytes(),value.getBytes());
                 }
                 return null ;
             }
         });
     }
}

如果要设置 key 的过期时间,通过 setEx() 来做就可以了,过期时间单位是秒,相关代码如下:

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/**
  * 合同批量导入redis
  *
  * @param contractBOList
  * @param expire
  * @return com.openailab.oascloud.common.model.ResponseResult
  * @author zxzhang
  * @date 2019/10/14
  */
@Override
public void contractBatchSetRedis(String contractBOList, long expire) {
     List<ContractBO> contracts = JSONObject.parseArray(contractBOList, ContractBO. class );
     if (contracts == null || contracts.size() == 0 ) {
         return ;
     }
     //批量set数据
     redisUtil.getRedisTemplate().executePipelined((RedisCallback<String>) connection -> {
         for (ContractBO contract : contracts) {
             connection.setEx((RedisPrefixConst.CONTRACT_PREFIX + contract.getBusinessCode() + RedisPrefixConst.UNDERLINE_SEPARATOR + contract.getContractNo()).getBytes(), expire, JSONObject.toJSONString(contract).getBytes());
         }
         return null ;
     });
}
 
/**
  * 合同批量获取redis
  *
  * @param contractBOList
  * @return java.lang.String
  * @author zxzhang
  * @date 2019/10/14
  */
@Override
public List<Object> contractBatchGetRedis(String contractBOList) {
     List<ContractBO> contracts = JSONObject.parseArray(contractBOList, ContractBO. class );
     if (contracts == null || contracts.size() == 0 ) {
         return null ;
     }
     List<Object> list = redisUtil.getRedisTemplate().executePipelined((RedisCallback<String>) connection -> {
         for (ContractBO contract : contracts) {
             connection.get((RedisPrefixConst.CONTRACT_PREFIX + contract.getBusinessCode() + RedisPrefixConst.UNDERLINE_SEPARATOR + contract.getContractNo()).getBytes());
         }
         return null ;
     });
     return list;
}

SpringBoot对redis批量存取介绍到此结束.

redisTemplate批量写入数据

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/**
     * 批量写入数据
     * @param objectMap
     * @return
     */
    public void saveMap( final Map<String,Object> objectMap) {
        //序列化成字节数组
        final Map< byte [], byte []> byteMap= new HashMap<>();
        for (Map.Entry<String,Object> objectEntry:objectMap.entrySet()){
            String key=objectEntry.getKey();
            final byte [] keyBytes = redisTemplate.getStringSerializer().serialize(key);
            Object value=objectEntry.getValue();
            final byte [] valueBytes =SerializeUtil.serialize(value);
            byteMap.put(keyBytes,valueBytes);
        }
 
        redisTemplate.execute( new RedisCallback<Object>() {
            @Override
            public Object doInRedis(RedisConnection connection) {
                try {
                    connection.mSet(byteMap);
                } catch (Exception ex){
                    log.error( "redis批量写入数据异常:" +ex.getMessage(),ex);
                }
                return null ;
            }
        });
    }

以上为个人经验,希望能给大家一个参考,也希望大家多多支持我.

原文链接:https://vegetable-chicken.blog.csdn.net/article/details/102553511 。

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