springboot设置bean为默认主要bean

当springboot有多个不能名称但是相同bean的时候，可以使用  @Primary 注解设置其中一个为主要默认bean

有些类它没有用别名去注入bean，会导致注入的时候找到多个相同bean，报错

```java
package com.jinw.config;

import com.jinw.utils.Threads;
import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.task.TaskExecutor;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 多线程配置
 *
 * @author admin
 */
@Configuration
@EnableAsync
public class ThreadConfig {
    /**
     * 短信类线程
     */
    public static final String SMS = "smsTaskExecutor";
    /**
     * 默认通用线程池
     */
    public static final String DEFAULT = "defaulTaskExecutor";
    /**
     * 周期性任务线程
     */
    public static final String SCHEDULED = "scheduledExecutorService";

/**
     * MAIL任务线程
     */
    public static final String MAIL = "mailTaskExecutor";

// 核心线程池大小
    private int corePoolSize = 50;

@Bean(DEFAULT)
    @Primary
    public TaskExecutor defaultExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(3);
        // 设置最大线程数
        executor.setMaxPoolSize(3);
        // 设置队列容量
        executor.setQueueCapacity(20);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix(DEFAULT + "-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }

@Bean(SMS)
    public TaskExecutor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(3);
        // 设置最大线程数
        executor.setMaxPoolSize(3);
        // 设置队列容量
        executor.setQueueCapacity(20);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix(SMS + "-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }

/**
     * 执行周期性或定时任务
     */
    @Bean(SCHEDULED)
    protected ScheduledExecutorService scheduledExecutorService() {
        return new ScheduledThreadPoolExecutor(corePoolSize,
                new BasicThreadFactory.Builder().namingPattern("schedule-pool-%d").daemon(true).build()) {
            @Override
            protected void afterExecute(Runnable r, Throwable t) {
                super.afterExecute(r, t);
                Threads.printException(r, t);
            }
        };
    }

/**
     * MAIL定时任务
     */
    @Bean(MAIL)
    public TaskExecutor mailTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(3);
        // 设置最大线程数
        executor.setMaxPoolSize(3);
        // 设置队列容量
        executor.setQueueCapacity(20);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix(MAIL + "-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }
}

```

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