@ResponseBody用于标识一个控制器方法，可以将该方法的返回值直接作为响应报文的响应体响应到 浏览器 

    1.  ![image.png](https://cdn.nlark.com/yuque/0/2021/png/21459194/1636706593144-93ed1cbf-848c-4f83-b66e-81d3f1865928.png#clientId=u6752609c-6ff7-4&from=paste&height=175&id=u188463f3&margin=%5Bobject%20Object%5D&name=image.png&originHeight=233&originWidth=601&originalType=binary&ratio=1&size=114674&status=done&style=shadow&taskId=u1c0878ed-e463-401c-bc54-e80e016659d&width=451)

    结果：页面将显示“success”这个字符串
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    ](https://blog.csdn.net/qq_36783524/article/details/105598764)