Java如何将List集合类型存放到Redis

在Java中我们通常将List存储到redis中，通常有两种方法：

• 通过Redis中的List数据类型存储，其核心就是通过opsForList()

  public static void main(String[] args) {
      List<Student> studentsAll = new ArrayList<>();
      StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
      List<Student> students = new ArrayList<>();
      for (Student students : students) {
          stringRedisTemplate.opsForList().rightPush("student", JSON.toJSONString(students));
      }
      List<String> studentList = stringRedisTemplate.opsForList()
          .range("student", 0, -1);
      // 将redis中的数据转换为对象集合
      for (String studentString : studentList) {
          studentsAll.add(BeanUtils.copyProperties(studentString,Student.class));
      }
  }
  

• 实际上还可以通过ObjectMapper方法

  public class JsonUtils{
      private static final ObjectMapper om = createObjectMapper();
  
      public static ObjectMapper createObjectMapper() {
          ObjectMapper om = new ObjectMapper();
  
          // 反序列化时，忽略Javabean中不存在的属性，而不是抛出异常
          om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
          // 忽略入参没有任何属性导致的序列化报错
          om.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS,false);
  
          return om;
      }
  
      public static <T> List<T> toListOfObject(String json, Class<T> clazz, ObjectMapper om) {
          try {
              @SuppressWarnings("unchecked") Class<T[]> arrayClass = (Class<T[]>) Class
                  .forName("[L" + clazz.getName() + ";");
              return Lists.newArrayList(om.readValue(json, arrayClass));
          } catch (IOException | ClassNotFoundException e) {
              log.error("json={}, clazz={}", json, clazz, e);
              throw new JsonException(e);
          }
      }
  }
  

  List<Student> studentsAll = new ArrayList<>();
  StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
  List<Student> students = new ArrayList<>();
  // 将student集合存放到redis中
  stringRedisTemplate.opsForValue().set("student",JSON.toJSONString(students));
  // 获取student对象
  String student = stringRedisTemplate.opsForValue().get("student");
  // 解析对象
  List<Student> st = JsonUtils.toListOfObject(student, Student.class);