解决在监听器中无法注入service问题

主要就是通过一个注解@Postconstruct注解，具体使用请阅读 https://www.cnblogs.com/qingruihappy/p/7861623.html

写一个工具类如：

 

package com.util;

import com.cf.core.base.mybatis.cf_base.SysRoleUser;
import com.cf.hczz.service.SysRoleUserService2;
import com.cf.hczz.service.SysUserService0;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.List;

/**

 * @Creation Date : 2018/11/14 14:40
 * @ModificationHistory Who When What
 * _________ ________________ ____________________________________________
 */
@Component
public class InjectServiceUtil {

    @Autowired
    private SysUserService0 sysUserService0;
    @Autowired
    private SysRoleUserService2 sysRoleUserService2;

    @PostConstruct
    public void init(){
        InjectServiceUtil.getInstance().sysUserService0 = this.sysUserService0;
        InjectServiceUtil.getInstance().sysRoleUserService2 = this.sysRoleUserService2;
    }

    /**
     *  实现单例 start
     */
    private static class SingletonHolder {
        private static final InjectServiceUtil INSTANCE = new InjectServiceUtil();
    }
    private InjectServiceUtil (){}
    public static final InjectServiceUtil getInstance() {
        return SingletonHolder.INSTANCE;
    }
    /**
     *  实现单例 end
     */
    public SysUserService0 getSysUserService0(){
        return InjectServiceUtil.getInstance().sysUserService0;
    }
    public SysRoleUserService2 getSysRoleUserService2(){
        return InjectServiceUtil.getInstance().sysRoleUserService2;
    }

}

在使用时可以直接调用工具类中你初始化的service类 ,在监听器中的方法中调用例如：

List list=InjectServiceUtil.getInstance().sysUserService0.getall();

这样就不会报空指针了。