1、报错原因。
我使用的是@RequestBody Map<String,Object> requestJsonMap 来接收参数。但是发送的是get请求，后面带参数，就会报这个错误
@RequestMapping("/download")
private void download(@RequestBody Map<String,Object> requestJsonMap, HttpServletResponse response){}
2、解决方法
@RequestMapping("/download")
public void download(HttpServletRequest request, HttpServletResponse response){
String directory = request.getParameter("directory");
String filename = request.getParameter("filename");
改成用这种方式来接收请求就可以了
标签：body,Map,missing,void,Required,request,HttpServletResponse,RequestBody,download From： https://www.cnblogs.com/wwssgg/p/17205618.html