三个小Demo理解三个功能:
案例中的pom.xml文件
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.7.4
com.hu
springboot-09
0.0.1-SNAPSHOT
springboot-09
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-mail
test
org.springframework.boot
spring-boot-starter-security
test
org.springframework.boot
spring-boot-maven-plugin
第一部分 异步
用户需求的的内容:我现在将一个方法定时了3秒,我想问一个问题 如果让用户让他等三秒 用户直接会投诉
@Service
public class AsyncService {
public void hellow(){
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("数据正在处理");
}
控制层的信息
@RestController
public class AsyncController {
AsyncService asyncService =new AsyncService();
@RequestMapping("/hello")
public String hello() {
//停止三秒
asyncService.hellow();
return "ok";
}
@Async告诉Spring是异步方法
第二部分 邮件
简单的邮件信息
package com.hu.springboot09;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;
@SpringBootTest
public class Springboot09ApplicationTests {
@Autowired
JavaMailSenderImpl mailSender;
@Test
void contextLoads() {
//一个简单的邮件
JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
mailSender.setSubject("小矿山");
mailSender.setTest("谢谢你的课程");
//f发送人
mailSender.setTo("[email protected]");
mailSender.setFrom("[email protected]");
}
复杂的邮件
MimeMessageHelper messageHelper = new MimeMessageHelper();
//复杂邮件
MimeMessage mimeMessage = mailSender.createMimeMessage();
//组件
try {
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true,"UTF-8");
//正文
helper.setSubject("小矿山");
helper.setText("",true);
//附件
helper.addAttachment("1.jpg",new File("C:\\Users\\MZFAITHDREAM\\Pictures\\Saved Picture"));
helper.addAttachment("2.jpg",new File("C:\\Users\\MZFAITHDREAM\\Pictures\\Saved Picture"));
//f发送人
helper.setTo("[email protected]");
helper.setFrom("[email protected]");
mailSender.send(mimeMessage);
} catch (MessagingException e) {
e.printStackTrace();
}
复杂的邮件方法
/**
*
* @param html
* @param subject
* @param text
* @throws MessagingException
* @Author
*/
public void SendMail(Boolean html,String subject,String text) throws MessagingException{
//复杂邮件
MimeMessage mimeMessage = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true,"UTF-8");
//正文
helper.setSubject(subject);
helper.setText(text,true);
//附件
helper.addAttachment("1.jpg",new File("C:\\Users\\MZFAITHDREAM\\Pictures\\Saved Picture"));
helper.addAttachment("2.jpg",new File("C:\\Users\\MZFAITHDREAM\\Pictures\\Saved Picture"));
//f发送人
helper.setTo("[email protected]");
helper.setFrom("[email protected]");
mailSender.send(mimeMessage);
}
}
第三部分 定时
cron表达式格式：
{秒数} {分钟} {小时} {日期} {月份} {星期} {年份(可为空)}
cron表达式各占位符解释：
{秒数}{分钟} ==> 允许值范围: 0~59 ,不允许为空值，若值不合法，调度器将抛出SchedulerException异常
“*” 代表每隔1秒钟触发；
“,” 代表在指定的秒数触发，比如”0,15,45”代表0秒、15秒和45秒时触发任务
“-“代表在指定的范围内触发，比如”25-45”代表从25秒开始触发到45秒结束触发，每隔1秒触发1次
“/”代表触发步进(step)，”/”前面的值代表初始值(““等同”0”)，后面的值代表偏移量，比如”0/20”或者”/20”代表从0秒钟开始，每隔20秒钟触发1次，即0秒触发1次，20秒触发1次，40秒触发1次；”5/20”代表5秒触发1次，25秒触发1次，45秒触发1次；”10-45/20”代表在[10,45]内步进20秒命中的时间点触发，即10秒触发1次，30秒触发1次
{小时} ==> 允许值范围: 0~23 ,不允许为空值，若值不合法，调度器将抛出SchedulerException异常,占位符和秒数一样
{日期} ==> 允许值范围: 1~31 ,不允许为空值，若值不合法，调度器将抛出SchedulerException异常
{星期} ==> 允许值范围: 1~7 (SUN-SAT),1代表星期天(一星期的第一天)，以此类推，7代表星期六(一星期的最后一天)，不允许为空值，若值不合法，调度器将抛出SchedulerException异常
{年份} ==> 允许值范围: 1970~2099 ,允许为空，若值不合法，调度器将抛出SchedulerException异常
注意：除了{日期}和{星期}可以使用”?”来实现互斥，表达无意义的信息之外，其他占位符都要具有具体的时间含义，且依赖关系为：年->月->日期(星期)->小时->分钟->秒数
cron表达式经典案例：
-
“30 * * * * ?” 每半分钟触发任务
-
“30 10 * * * ?” 每小时的10分30秒触发任务
-
“30 10 1 * * ?” 每天1点10分30秒触发任务
-
“30 10 1 20 * ?” 每月20号1点10分30秒触发任务
-
“30 10 1 20 10 ? *” 每年10月20号1点10分30秒触发任务
-
“30 10 1 20 10 ? 2011” 2011年10月20号1点10分30秒触发任务
-
“30 10 1 ? 10 * 2011” 2011年10月每天1点10分30秒触发任务
-
“30 10 1 ? 10 SUN 2011” 2011年10月每周日1点10分30秒触发任务
-
“15,30,45 * * * * ?” 每15秒，30秒，45秒时触发任务
-
“15-45 * * * * ?” 15到45秒内，每秒都触发任务
-
“15/5 * * * * ?” 每分钟的每15秒开始触发，每隔5秒触发一次
-
“15-30/5 * * * * ?” 每分钟的15秒到30秒之间开始触发，每隔5秒触发一次
-
“0 0/3 * * * ?” 每小时的第0分0秒开始，每三分钟触发一次
-
“0 15 10 ? * MON-FRI” 星期一到星期五的10点15分0秒触发任务
-
“0 15 10 L * ?” 每个月最后一天的10点15分0秒触发任务
-
“0 15 10 LW * ?” 每个月最后一个工作日的10点15分0秒触发任务
-
“0 15 10 ? * 5L” 每个月最后一个星期四的10点15分0秒触发任务
-
“0 15 10 ? * 5#3” 每个月第三周的星期四的10点15分0秒触发任务
package com.hu.springboot09.Controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import service.AsyncService;
import service.ScheduledService;
@RestController
public class AsyncController {
AsyncService asyncService =new AsyncService();
ScheduledService scheduledService = new ScheduledService();
@RequestMapping("/hello")
public String hello() {
//停止三秒
asyncService.hellow();
scheduledService.hello1();
return "ok";
}
}
启动程序
package com.hu.springboot09;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
//开启功能
@EnableAsync
@EnableScheduling//开启定时注解
@SpringBootApplication
public class Springboot09Application {
public static void main(String[] args) {
SpringApplication.run(Springboot09Application.class, args);
}
}
"C:\Program Files\Java\jdk1.8.0_171\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\IDEA\com.text\IntelliJ IDEA 2020.1.2\lib\idea_rt.jar=56121:D:\IDEA\com.text\IntelliJ IDEA 2020.1.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_171\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\rt.jar;D:\maven-workspace\spaceVideospringboot\springboot-09\target\classes;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.7.4\spring-boot-starter-web-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-starter\2.7.4\spring-boot-starter-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot\2.7.4\spring-boot-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.7.4\spring-boot-autoconfigure-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.7.4\spring-boot-starter-logging-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;C:\Users\MZFAITHDREAM\.m2\repository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;C:\Users\MZFAITHDREAM\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-core\5.3.23\spring-core-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-jcl\5.3.23\spring-jcl-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\yaml\snakeyaml\1.30\snakeyaml-1.30.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.7.4\spring-boot-starter-json-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.13.4\jackson-databind-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.13.4\jackson-annotations-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.13.4\jackson-core-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.4\jackson-datatype-jdk8-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.4\jackson-datatype-jsr310-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.4\jackson-module-parameter-names-2.13.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.7.4\spring-boot-starter-tomcat-2.7.4.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.65\tomcat-embed-core-9.0.65.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.65\tomcat-embed-el-9.0.65.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.65\tomcat-embed-websocket-9.0.65.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-web\5.3.23\spring-web-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-beans\5.3.23\spring-beans-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-webmvc\5.3.23\spring-webmvc-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-context\5.3.23\spring-context-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-expression\5.3.23\spring-expression-5.3.23.jar;C:\Users\MZFAITHDREAM\.m2\repository\org\springframework\spring-aop\5.3.23\spring-aop-5.3.23.jar" com.hu.springboot09.Springboot09Application
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.7.4)
2022-10-05 20:32:51.731 INFO 26304 --- [ main] c.h.s.Springboot09Application : Starting Springboot09Application using Java 1.8.0_171 on HELLOWWORLD with PID 26304 (D:\maven-workspace\spaceVideospringboot\springboot-09\target\classes started by MZFAITHDREAM in D:\maven-workspace\spaceVideospringboot\springboot-09)
2022-10-05 20:32:51.736 INFO 26304 --- [ main] c.h.s.Springboot09Application : No active profile set, falling back to 1 default profile: "default"
2022-10-05 20:32:53.313 INFO 26304 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-10-05 20:32:53.324 INFO 26304 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-10-05 20:32:53.325 INFO 26304 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.65]
2022-10-05 20:32:53.571 INFO 26304 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-10-05 20:32:53.571 INFO 26304 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1768 ms
2022-10-05 20:32:53.922 INFO 26304 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-10-05 20:32:53.940 INFO 26304 --- [ main] c.h.s.Springboot09Application : Started Springboot09Application in 2.843 seconds (JVM running for 4.093)
2022-10-05 20:33:17.233 INFO 26304 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-10-05 20:33:17.233 INFO 26304 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-10-05 20:33:17.234 INFO 26304 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
数据正在处理
hello 什么方法被执行了
不管前方的路有多苦，只要走的方向正确，不管多么崎岖不平，都比站在原地更接近幸福。
