Spring Boot integrates Redis, timing tasks, and asynchronous tasks

The overall project can view the summary directory link: Spring Boot development common technology blog directory

Directory Structure

Spring Boot integrates Redis

Introduce dependencies in pom.xml

<!-- 引入 redis 依赖 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

application.yml

spring:
  redis:
    host: 127.0.0.1   # Redis服务器地址
    port: 6379      # Redis服务器端口
    password:       # Redis服务器链接密码（默认空）
    database: 0  #Reidis数据库索引（默认0）
    timeout: 0  #连接超时时间（毫秒）
    jedis:      
      pool: 
        max-active: 1000  # 连接池最大连接数（使用负值表示没有限制）
        max-wait: -1 # 最大阻塞等待时间（使用负值表示没有限制）
        max-idle: 10  # 最大空闲连接
        min-idle: 2  # 最小空闲连接

RedisController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.xiangty.common.Result;
import com.xiangty.pojo.User;

@Controller
@RequestMapping("/redis")
@SuppressWarnings({
    
    "unchecked","rawtypes"})
public class RedisController {
    
    
	
	@Autowired
	private RedisTemplate redisTemplate;
	
	@RequestMapping("/testRedis")
	@ResponseBody
	public Result testRedis() {
    
    
		String key = "testRedis";
		redisTemplate.opsForValue().set(key, "testRedisValue");
		return Result.ok("从Redis中获取值:"+redisTemplate.opsForValue().get(key));
	}
	
	@RequestMapping("/testRedisUser")
	@ResponseBody
	public Result testRedisUser() {
    
    
		String key = "testRedisUser";
		User user = new User();
		user.setUsername("测试UserName");
		user.setPassword("测试passWord");	
		redisTemplate.opsForValue().set(key, user);	
		return Result.ok(redisTemplate.opsForValue().get(key));
	}	
}

Visit http://localhost:8088/redis/testRedis

Visit http://localhost:8088/redis/testRedisUser
need to pay attention: when Redis saves the object, the object needs to be serialized. User.java implements Serializable in access.

Spring Boot integrates timing tasks

SpringbootStarterApplication.java
add:
@EnableScheduling annotation
@ComponentScan(basePackages= {"com.xiangty"}) package scan data

Create a new SystemDateTask.java and create a timed task to output the time every five seconds

import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class SystemDateTask {
    
    
	// 每五秒一次，时间格式可以网上搜索cron设置即可（可以参考https://cron.qqe2.com/）
	@Scheduled(cron="0/5 * * * * ?")
	public void systemDateTask(){
    
    
		System.out.println("SystemDateTask输出："+new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
	}
}

After the project is started, check the console output as follows:

Spring Boot asynchronous tasks

SpringbootStarterApplication.java add @EnableAsync annotation

AsyncService.java

import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class AsyncService {
    
    
	@Async
	public void tesetAsync() {
    
    
		try {
    
    
			Thread.sleep(3000);
		} catch (InterruptedException e) {
    
    
			e.printStackTrace();
		}
		System.out.println("业务进行中....  " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
	}
}

HelloController.java

import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.xiangty.common.Result;
import com.xiangty.pojo.Resource;
import com.xiangty.service.AsyncService;

@RestController
public class HelloController {
    
    
	@Autowired
	private AsyncService asyncService;
	
	@RequestMapping("/aysncTest")
	public Object asyncTest() {
    
    
		asyncService.tesetAsync();
		return "Hello async: " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
	}
}

After the page is requested, the page quickly gets a response, and the console will output the content after three seconds. Use @EnableAsync and @Async to execute methods asynchronously.

The overall project can view the summary directory link: Spring Boot development common technology blog directory