redis中存储list＜map＞,list＜entity＞结构数据如何处理

redis中存储list结构数据如何处理

用到的工具类

1、序列化操作

String multiMapStr = JSON.toJSONString(multiMapList); // list转换为json字符串
Object o = JSON.parse(userList); // list转换为object
List> maps = CastBeanUtil.castListMap(JSON.parse(userList), String.class, String.class);// object转换list
List tzAreas = JSON.parseArray(res, TzArea.class); // 反序列化，json字符串转换为list

2、object转换为指定类型的map或者其他类型

使用如下工具类，可以将object转换为list《map》

package com.geekmice.springbootselfexercise.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @BelongsProject: spring-boot-self-exercise
 * @BelongsPackage: com.geekmice.springbootselfexercise.utils
 * @Author: pingmingbo
 * @CreateTime: 2023-12-09  15:34
 * @Description: TODO
 * @Version: 1.0
 */
public class CastBeanUtil {

    private CastBeanUtil() {
    }

    /**
     * object 转换为list
    public static <K, V> List<Map<K, V>> castListMap(Object obj, Class<K> kCalzz, Class<V> vCalzz) {
        List<Map<K, V>> result = new ArrayList<>();
        if (obj instanceof List<?>) {
            for (Object mapObj : (List<?>) obj) {
                if (mapObj instanceof Map<?, ?>) {
                    Map<K, V> map = new HashMap<>(16);
                    for (Map.Entry<?, ?> entry : ((Map<?, ?>) mapObj).entrySet()) {
                        map.put(kCalzz.cast(entry.getKey()), vCalzz.cast(entry.getValue()));
                    }
                    result.add(map);
                }
            }
            return result;
        }
        return null;
    }

}

通过字符串类型处理

list《map》形式
key:字符串
val:序列化过的字符串

List<Map<String, String>> multiMapList = Lists.newArrayList();
for (int i = 0; i < 5; i++) {
     LinkedHashMap<String, String> itemMap = Maps.newLinkedHashMap();
     itemMap.put("name", "jack" + i);
     if (i % 2 == 0) {
         itemMap.put("age", String.valueOf(10 + i));
         itemMap.put("sex", "男");
     } else {
         itemMap.put("age", String.valueOf(11 + i));
         itemMap.put("sex", "女");
     }
     multiMapList.add(itemMap);
 }
String multiMapStr = JSON.toJSONString(multiMapList);
client.opsForValue().set("str:multiusers", multiMapStr, DateConstant.TIME_OF_DAY, TimeUnit.SECONDS);
String userList = client.opsForValue().get("str:multiusers");
List<Map<String, String>> maps = CastBeanUtil.castListMap(JSON.parse(userList), String.class, String.class);
log.info("maps : [{}]", maps);

list《entity》结构数据

List<TzArea> areaList = Lists.newArrayList();
 for (int i = 0; i < 10; i++) {
     TzArea item = new TzArea();
     item.setAreaId((long) i);
     item.setAreaName("江苏省");
     item.setLevel(1);
     item.setParentId(1L);
     areaList.add(item);
 }

 client.opsForValue().set("str:multiareas", JSON.toJSONString(areaList), DateConstant.TIME_OF_DAY, TimeUnit.SECONDS);
 String res = client.opsForValue().get("str:multiareas");
 List<TzArea> tzAreas = JSON.parseArray(res, TzArea.class);
 log.info("tzAreas : [{}]", JSON.toJSONString(tzAreas));