前言

下载文件报错

 java.lang.IllegalStateException: Cannot call reset() after response has been committed
	at org.apache.catalina.connector.ResponseFacade.reset(ResponseFacade.java:347)
	at ins.platfrom.services.FileService.downloadTemplate2(FileService.java:1215)
	at ins.platfrom.controller.FileController.downloadTemplate(FileController.java:35)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)

原因

响应需要提前清空 然后再获取输出流 顺序不能颠倒 测试中发现

     // 清空response
            response.reset();
            fis =new FileInputStream(fileName);
            out = response.getOutputStream();

本文地址：https://blog.csdn.net/HezhezhiyuLe/article/details/114268554