Spring Boot如何在拦截器中返回body信息呢?

拦截器中返回body的方法
      我们只需在拦截器中向response写入信息
      即可实现返回body的效果
  如:
    调用HttpServletResponse类中getWriter()
	   获取PrintWriter对象
    然后使用write方法即可写入相关信息

  
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException{
    response.setContentType("application/json; charset=utf-8");
    PrintWriter writer = response.getWriter();
    writer.print(JSONObject.toJSONString(data));
    writer.close();
    response.flushBuffer();
}