Spring 事件监听机制实现跨模块调用的思路详解

public class getUserInfoEvent extends ApplicationEvent {
    private String message;
    private Integer griddingId;
    private StringBuilder griddingName;
   public getUserInfoEvent(Object source, String message, Integer griddingId, StringBuilder griddingName) {
        super(source);
        this.message = message;
        this.griddingId = griddingId;
        this.griddingName = griddingName;//接收要获取到值的StringBuilder
    }
   public StringBuilder getGriddingName() {
        return griddingName;
    }
   public Integer getGriddingId() {
        return griddingId;
    }
   public String getMessage() {
        return message;
    }
}

   @Autowired
   ApplicationEventPublisher applicationEventPublisher;   //这个必须注入
@Override
   public SysUserVO getUserInfo(Long userId) {
       SysUser user = getById(userId);
       Integer griddingId = user.getGriddingId();
       StringBuilder griddingName= new StringBuilder();  //使用stringbuilder进行引用字符串操作，来获取需要的值
	//上面是业务相关
       getUserInfoEvent event = new getUserInfoEvent(this,"发布“获取用户信息”事件",griddingId,griddingName); //定义事件
       applicationEventPublisher.publishEvent(event);  //发布事件
       //下面是获取到数据之后的操作，不重要
       //这里事件是同步进行的
       SysUserVO sysUserVO = new SysUserVO();
       BeanUtils.copyProperties(user,sysUserVO);
       sysUserVO.setGriddingName(griddingName.toString());
       //  找到该用户所属角色
       String roleName = getRoleByUserId(userId);
       sysUserVO.setRoleName(roleName);
       SysUser parentUser = sysUserMapper.selectById(user.getParentId());
       sysUserVO.setParentName(ObjectUtils.isEmpty(parentUser) ? null : parentUser.getUserName());
       return sysUserVO;
   }

@EventListener
public void getGriddingNameByUserIdEventListener(getUserInfoEvent event) { //参数必须填写要监听的事件类，事件发布后这边就会监听到
    //形参event中存有传递的相关数据
    System.out.println(event.getMessage()); //会打印出---发布“获取用户信息”事件
    //下面为个人业务相关代码
    Integer griddingId = event.getGriddingId();
    StringBuilder griddingName = event.getGriddingName();
    //再通过网格id来查找对应的网格信息
    GriddingArea griddingArea = getOne(new LambdaQueryWrapper<GriddingArea>().eq(GriddingArea::getId, griddingId));
    griddingName.append(griddingArea.getGriddingName());  //使用同一个StringBuilder对象来操作，这里把获取到的字符串存入后，事件发布者那边就能得到数据了。
    System.out.println("griddingName"+griddingName);
}