springboot事件监听

 

一、定义事件

 

package com.base.common.event;

import com.base.common.core.domain.entity.SysUser;
import org.springframework.context.ApplicationEvent;

public class MyCustomEvent extends ApplicationEvent {

    private SysUser user;

    public MyCustomEvent(Object source, SysUser user) {
        super(source);
        this.user = user;
    }

    public SysUser getUser() {
        return user;
    }
}

 

二、定义事件监听

自定义异步方法写法：

package com.base.common.event;

import com.base.common.core.domain.entity.SysUser;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.event.EventListener;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class MyCustomEventListener {

    @EventListener
    @Async("threadPoolTaskExecutor")
    public void onApplicationEvent(MyCustomEvent event) {
        SysUser user = event.getUser();
        try {
            Thread.sleep(3000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        log.info("bean-listener 收到了 publisher 发布的消息: " + user.getUserName());

    }

}

 

实现ApplicationListener接口写法：

package com.base.common.event;

import com.base.common.core.domain.entity.SysUser;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.ApplicationListener;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

@Slf4j
@Component
@AllArgsConstructor
public class MyCustomEventListener implements ApplicationListener<MyCustomEvent> {

    private final ThreadPoolTaskExecutor threadPoolTaskExecutor;

    @Override
    public void onApplicationEvent(MyCustomEvent event) {
        threadPoolTaskExecutor.execute(() -> {
            SysUser user = event.getUser();
            try {
                Thread.sleep(3000);
            } catch (Exception e) {
                e.printStackTrace();
            }
            log.info("bean-listener 收到了 publisher 发布的消息: " + user.getUserName());
        });

    }

}

三、发布事件

@Slf4j
@RestController
@RequestMapping("/system/user")
@AllArgsConstructor
public class SysUserController extends BaseController {

    private final ISysUserService userService;
    private final ApplicationContext context;

    @PostMapping("/send")
    public AjaxResult send() {
        String message = "发送成功";

        SysUser sysUser = userService.selectUserById(1L);

        MyCustomEvent event = new MyCustomEvent(this, sysUser);
        context.publishEvent(event);

        return success(message);
    }

}