四种思路java.lang.ClassCastException:org.apache.catalina.connector.RequestFacade cannot be cast....
2017-01-22 17:51
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在上篇文章文件上传的时候遇到这个bug,然后,各种调查,综合各种查和加上自己的经验,下面总结一下比较完整的几个思路.
接思路一:直替换参数为需要的request,因为
上一篇文章在开始,大家可能注意到和大多数博客中写的有一点不同:大多数文章是:HttpServletRequest参数,而不是MultipartRequest请求,原因就是在开始用httpServerleteRequest的时候遇到下面的堆栈错误.
@RequestMapping(value="/batch/upload", method= RequestMethod.POST)
public @ResponseBody
String handleFileUpload(HttpServletRequest request){
List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("file");
'''''//和上一篇文章类似
}
思路二:
检查jar包是否完整也就是上篇博客的commons-fileupload和commons-io这两个依赖
接思路一:直替换参数为需要的request,因为
public interface MultipartHttpServletRequest extends HttpServletRequest, MultipartRequest,
上一篇文章在开始,大家可能注意到和大多数博客中写的有一点不同:大多数文章是:HttpServletRequest参数,而不是MultipartRequest请求,原因就是在开始用httpServerleteRequest的时候遇到下面的堆栈错误.
@RequestMapping(value="/batch/upload", method= RequestMethod.POST)
public @ResponseBody
String handleFileUpload(HttpServletRequest request){
List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("file");
'''''//和上一篇文章类似
}
思路二:
检查jar包是否完整也就是上篇博客的commons-fileupload和commons-io这两个依赖
思路三:
是否有配置文件,配置文件大小,上篇文件的
@Component public MultipartConfigElement multipartConfigElement(){ MultipartConfigFactory factory=new MultipartConfigFactory(); factory.setMaxFileSize("128KB"); factory.setMaxRequestSize("128KB"); return factory.createMultipartConfig(); }
思路四:
前端的调用时候传递的参数是否为form-data的形式:enctype="multipart/form-data"
思路五:
直接在自己的代码中判断multipartResolver.isMultipart(request),从而调过程序自己的判断,然后再转成CommonsMultipartResolver 的形式,就不会产生强制转化的错误了.
//多文件上传(也包含单文件) @RequestMapping(value = "/multiFile", method = RequestMethod.POST) @ResponseBody public List<String> multiFileUpload1(HttpServletRequest request, @RequestParam("orderCode") String orderCode) throws IllegalStateException, IOException { //创建一个通用的多部分解析器 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); //判断 request 是否有文件上传,即多部分请求 if(multipartResolver.isMultipart(request)) { //转换成多部分request MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request; List<MultipartFile> files = multiRequest.getFiles("file"); return uploadUtil.multiFileUpload(files, orderCode); } return null; }
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