Question

我在项目中使用Spring-boot tomcat。

我有多部分文件上传，限制设置如下。

led; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (4719402) exceeds the configured maximum (1048576)] with root cause
org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (4719402) exceeds the configured maximum (1048576)
        at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:811) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.parseParts(Request.java:2734) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.parseParameters(Request.java:3073) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.getParameter(Request.java:1095) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:380) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:70) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_73]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_73]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.28.jar:8.0.28]

但是，如果用户试图加载超过1 MB的文件，则会引发一些异常。

class tablVC: UITableViewController {
...
func thingsToDo() {
doSomeGenericStuff(indexPath: anIndexPath, targetTableView: self.tableView [, the Delegate: UITableViewDelegate]) //the part in parentheses is explained blow
}
...
    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
// do stuff
}
...

}

我不确定，我如何处理此异常，以便用户在屏幕上收到一些有意义的错误消息。

Answer 1

我不确定，但我认为您可以使用错误页面处理此异常：

 // in web.xml
 <error-page>
    <error-code>413</error-code>
    <location>/ErrorHandlerServlet</location>
 </error-page>
 ... handlers for other http codes ...

413 - ＆＃34;请求实体太大＆＃34;的http代码错误。

声明ErrorHandlerServlet错误页面（例如，使用＆lt;％@ page page isErrorPage =＆＃34; true＆＃34;％＆gt;指令创建JSP）并处理413：

Integer statusCode = (Integer) httpRequest.
        getAttribute("javax.servlet.error.status_code");
if (statusCode == 413) {
        // print message...
}
// handle another error...

Answer 2

你做这样的事情：

catch (Exception e) {
    redirectAttributes.addFlashAttribute("message",
            "You failed to upload, because file size too big " + name + " => " + e.getMessage());
}

抓住异常，然后将Flash消息发送到用户的浏览器：redirectAttributes.addFlashAttribute()

这是处理上传过程的官方教程（在春季）：https://spring.io/guides/gs/uploading-files/

Tomcat 8 - 最大文件大小

2 个答案: