springBoot整合Redis步骤

1、pom.xml导包

    
            org.springframework.boot
            spring-boot-starter-data-redis
        

2.yml配置文件中配置Redis数据源

redis:
    host:
    password: 
    port: 
    database: 7
    jedis:
      pool:
        max-idle: 10
        max-active: 10
        min-idle: 4

3.把实体对象存放进Redis。
我是在项目初始化完成后将热点数据存入Redis，然后在不同场景去调用。
ServletContextListener接口能够监听 ServletContext 对象的生命周期，实际上就是监听 Web 应用的生命周期。当servlet容器启动或者终止web应用时，会触发ServletContextEvent 事件。该事件由ServletContextListener 来处理。在 ServletContextListener 接口中定义了处理ServletContextEvent 事件的两个方法。
另外一点就是，由于Redis不支持对象的存放，需要将对象序列化或者 转成json。我自己用的是转成json的方式，简单、方便，直接引入包就可以直接使用，不需要额外代码。

/**
 * @ClassNameInitServletContextListener
 * @Description TODO
 * @Author Yuyan
 * @Date 2020/8/1815:07
 * @Version V1.0
 */
@WebListener
@RestController
@RequestMapping("/redis")
public class InitServletContextListener implements ServletContextListener {
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private ListFieldService listFieldService;

    public void initService(ServletContextEvent servletContextEvent){
        WebApplicationContext wat = WebApplicationContextUtils.getWebApplicationContext(servletContextEvent.getServletContext());
        listFieldService=wat.getBean(ListFieldService.class);
    }


    @SneakyThrows
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {

        List
 formList = listFieldService.getAllField();
        for (Form form:formList) {
            redisTemplate.opsForValue().set("form:"+form.getFormId().toString(),new ObjectMapper().writeValueAsString(form) );
        }

        List customFormList = listFieldService.getAllCustomForm();
        for (CustomForm customForm:customFormList) {
            String keyString = customForm.getUserEid()+"-"+customForm.getFormId().toString();
            redisTemplate.opsForValue().set("column:"+keyString, new ObjectMapper().writeValueAsString(customForm));
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        System.out.println("系统销毁。。。");
    }

4.从Redis中获取数据

  public Object getListFieldConfig(String userEid, String formId) throws JsonProcessingException {
        ObjectMapper om = new ObjectMapper();
        CustomForm customForm = new CustomForm();
        String key = "column:"+userEid+"-"+formId;
       // CustomForm customForm = (CustomForm) redisTemplate.opsForValue().get(key);
       String customForm_1 =  redisTemplate.opsForValue().get(key);
        customForm = om.readValue(customForm_1, CustomForm.class);
        if(null == customForm){
            customForm = customFieldMapper.findCustomField(userEid, formId);
        }

        if(null != customForm){
            return customForm;
        }else{
            Form form = new Form();
            String fKey = "form:"+formId;
            String form_1 =  redisTemplate.opsForValue().get(fKey);
            form = om.readValue(form_1, Form.class);
            if(null == form){
                form = customFieldMapper.findFormById(formId);
            }
            return form;
        }
    }