31、springboot与任务

异步任务

测试如下：

进行等待三秒在进行应答

@Service
public class AsynService {
 
    public void hello(){
        try {
            Thread.sleep();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("处理数据.....");
    }
}

controller类：

@Controller
public class AsynController {
 
    @Autowired
    AsynService asynService;
 
    @ResponseBody
    @RequestMapping("/hello")
    public String hello(){
        asynService.hello();
        return "success";
    }
}

此时会有三秒的等待响应时间！！！！

但是如果工程量大的话，这样会比较麻烦

@Service
public class AsynService {
 
    //告诉spring这是一个异步的方法
    @Async
    public void hello(){
        try {
            Thread.sleep();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
 
        System.out.println("处理数据.....");
    }
}

开启方法：

@EnableAsync
@SpringBootApplication
public class TaskApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(TaskApplication.class, args);
    }
 
}

执行时 会立即响应  但是打印输出会在三秒之后

定时任务

项目开发中经常需要执行一些定时任务

比如凌晨时候，分析一个前一天的日志信息

Spring为我们提供了异步执行任务调度的方式

提供了TaskExecutor、TaskScheduler接口

cron属性：

*代表全部

定时做打印操作：

@Service
public class ScheduleService {
 
    //cron：second、minute、hour、day of mounth、day of week
    @Scheduled(cron ="0 * * * * MON-SAT" )
    public void hello(){
        System.out.println("定时处理");
    }
 
}

开启注解：

//开启定时任务
@EnableScheduling
@SpringBootApplication
public class TaskApplication {
    public static void main(String[] args) {
        SpringApplication.run(TaskApplication.class, args);
    }
}

在任意分钟的0-10s进行打印

@Scheduled(cron = "0-10 * * * * 0-7")
public void hello(){
    System.out.println("定时处理");
}

邮件任务

-邮寄发送需要引入spring-boot-starter-mail

-Springboot 自动配置MailSenderAutoConfiguration

-定义MailProperties内容，配置在application.yml中

-自动装配JavaMailSender

-测试邮件的发送

自动配置的类

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@ConfigurationProperties(
    prefix = "spring.mail"
)
public class MailProperties {
    private static final Charset DEFAULT_CHARSET;
    private String host;
    private Integer port;
    private String username;
    private String password;
    private String protocol = "smtp";
    private Charset defaultEncoding;
    private Map<String, String> properties;
    private String jndiName;
...
}

配置文件：

spring.mail.username=@qq.com
#授权码
spring.mail.password=keoszgbsssddbaad
spring.mail.host=smtp.qq.com
spring.mail.properties.mail.smtp.ssl.enable=true

host：

测试代码：

简单邮件

@Autowired
JavaMailSenderImpl javaMailSender;
 
@Test
public void contextLoads() {
    SimpleMailMessage msg = new SimpleMailMessage();
    //邮件设置
    msg.setSubject("猪头");
    msg.setText("你就是猪头哦！！");
    msg.setTo("xxxxxxxxx@qq.com");
    msg.setFrom("12872213xx@qq.com");
 
    javaMailSender.send(msg);
}

测试中邮件是可以成功发送的！！！

复杂的邮件测试：

@Test
public void test1() throws MessagingException {
    //创建复杂邮件
    MimeMessage msg = javaMailSender.createMimeMessage();
    //上传文件
    MimeMessageHelper helper = new MimeMessageHelper(msg,true);
 
    //邮件设置
    helper.setSubject("pig");
 
    helper.setText("<b style='color:red'>pig..... </b>",true);
    helper.setTo("3212393029@qq.com");
    helper.setFrom("12872213xx@qq.com");
 
    //上传文件
    helper.addAttachment("319898.jpg",new File("D:\\Tools\\319898.jpg"));
 
    javaMailSender.send(msg);
}

html的设置等都可以显示，图片的上传！！！