springMVC笔记系列(21)——springMVC自带的上传文件功能实现
springMVC为咱们提供了上传文件的内部支持，咱们只须要一些配置，而后就能够借助于sprinngMVC提供给咱们的接口完成文件上传的工做。javascript
首选找到与springMVC的前端控制器DispatchServlet相关的上下文，即\WEB-INF\configs\spring\mvc-dispatcher-servlet.xmlcss
在DispatchServlet的上下文中配置一个类型为org.springframework.web.multipart.commons.CommonsMultipartResolver的bean。html
<!--200*1024*1024即200M resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="209715200"/>
<property name="defaultEncoding" value="UTF-8"/>
<property name="resolveLazily" value="true"/>
</bean>
这个bean专门用来为咱们解析上载的文件。这个bean能够配置三个属性：前端
maxUploadSize设置文件上传的大小上限，单位是Byte，因此200MB这种记得本身算好算数哦。java
defaultEncoding是默认编码，这里咱们用的是UTF-8。web
resolveLazily是延迟加载，这个设置为true，主要是为了提升性能，在须要的时候再进行解析。spring
咱们从这个类的类型名称中带有的Common前缀能够看出，它依赖了apache的jar包，是的，事实就是如此。所以，咱们须要在POM.xml中加入jar。apache
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
顺便提一下，这个jar包所依赖的commons-io的jar包也会自动加载，无须在pom中显示引入commons-io坐标。编程
而后咱们如今设计一个上传案例：浏览器
咱们设计请求localhost:8080/mvc/courses/upload
所以控制器类中添加一个方法：
@RequestMapping(value="/upload", method=RequestMethod.GET)
public String showUploadPage(){
return "course_admin/file";
}
而后，咱们添加对应的JSP文件\WEB-INF\jsps\course_admin\file.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>HappyBKs Upload Page</title>
<link rel="stylesheet" href="<%=request.getContextPath()%>/resources/css/main.css" type="text/css" />
</head>
<body>
<div align="center">
<h1>上传附件</h1>
<form method="post" action="/courses/doUpload" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="submit"/>
</form>
</div>
</body>
</html>
该页面的表单中包含了一个file类型的input和一个submit按钮，另一个值得注意的是，form自己与通常的表单相比在这里需要额外添加一个属性enctype="multipart/form-data"，这是咱们在文件上传时所必须显示指明的属性，没有这个属性将没法完成文件上传工做。
这个表单提交后请求的url是localhost:8080/mvc/courses/doUpload，方法固然是POST。
所以，咱们需要继续为这个请求再建立一个控制器方法来响应这个URL请求。在以前就说了，springMVC在进行相应的配置以后，就能够经过springMVC提供的一些接口来完成上载文件功能的编程实践：
@RequestMapping(value="/doUpload", method=RequestMethod.POST)
public String doUploadFile(@RequestParam("file") MultipartFile file) throws IOException {
if(!file.isEmpty()){
log.info("Process file(getOriginalFilename): {}", file.getOriginalFilename());
log.info("Process file(getName): {}", file.getName());
log.info("Process file(getContentType): {}", file.getContentType());
log.info("Process file(getSize): {}", file.getSize());
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("c:\\temp\\happyBKs\\", System.currentTimeMillis()+ file.getOriginalFilename()));
}
return "success";
}
这个接口是一个类——org.springframework.web.multipart.MultipartFile。
springMVC的源代码中的接口定义接口以下：
package org.springframework.web.multipart;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.springframework.core.io.InputStreamSource;
/**
* A representation of an uploaded file received in a multipart request.
*
* <p>The file contents are either stored in memory or temporarily on disk.
* In either case, the user is responsible for copying file contents to a
* session-level or persistent store as and if desired. The temporary storages
* will be cleared at the end of request processing.
*
* @author Juergen Hoeller
* @author Trevor D. Cook
* @since 29.09.2003
* @see org.springframework.web.multipart.MultipartHttpServletRequest
* @see org.springframework.web.multipart.MultipartResolver
*/
public interface MultipartFile extends InputStreamSource {
/**
* Return the name of the parameter in the multipart form.
* @return the name of the parameter (never {@code null} or empty)
*/
String getName();
/**
* Return the original filename in the client's filesystem.
* <p>This may contain path information depending on the browser used,
* but it typically will not with any other than Opera.
* @return the original filename, or the empty String if no file
* has been chosen in the multipart form, or {@code null}
* if not defined or not available
*/
String getOriginalFilename();
/**
* Return the content type of the file.
* @return the content type, or {@code null} if not defined
* (or no file has been chosen in the multipart form)
*/
String getContentType();
/**
* Return whether the uploaded file is empty, that is, either no file has
* been chosen in the multipart form or the chosen file has no content.
*/
boolean isEmpty();
/**
* Return the size of the file in bytes.
* @return the size of the file, or 0 if empty
*/
long getSize();
/**
* Return the contents of the file as an array of bytes.
* @return the contents of the file as bytes, or an empty byte array if empty
* @throws IOException in case of access errors (if the temporary store fails)
*/
byte[] getBytes() throws IOException;
/**
* Return an InputStream to read the contents of the file from.
* The user is responsible for closing the stream.
* @return the contents of the file as stream, or an empty stream if empty
* @throws IOException in case of access errors (if the temporary store fails)
*/
@Override
InputStream getInputStream() throws IOException;
/**
* Transfer the received file to the given destination file.
* <p>This may either move the file in the filesystem, copy the file in the
* filesystem, or save memory-held contents to the destination file.
* If the destination file already exists, it will be deleted first.
* <p>If the file has been moved in the filesystem, this operation cannot
* be invoked again. Therefore, call this method just once to be able to
* work with any storage mechanism.
* <p><strong>Note:</strong> when using Servlet 3.0 multipart support you
* need to configure the location relative to which files will be copied
* as explained in {@link javax.servlet.http.Part#write}.
* @param dest the destination file
* @throws IOException in case of reading or writing errors
* @throws IllegalStateException if the file has already been moved
* in the filesystem and is not available anymore for another transfer
*/
void transferTo(File dest) throws IOException, IllegalStateException;
}
这个接口实现的类对象能够得到文件的本地文件名、内容类型、大小等信息。
那么控制器的方法参数MultipartFile如何与请求提交的表单元素相关联呢？POST请求的表单元素是一种请求参数，创建请求参数与控制器方法参数之间的映射关联，固然用的是注解@RequestParam，如上面的控制器方法代码所示。这里@RequestParam("file")的值“file”与请求提交的表单中form的<input type="file" name="file"/>中的name="file"名称对应，这样表单中name是file的元素的值就绑定到了控制器方法参数上，它的类型会被转换成MultipartFile，整个复杂的转换过程都由springMVC咱们完成，咱们本身要作的仅仅是使用这个留给咱们的接口MultipartFile。
这里，咱们还将MultipartFile的各个属性也一并输出到日志。
值得注意的是，实际的文件处理用了FileUtils来处理文件的相关操做，这是commons-io中十分有用的工具类，来完成文件的拷贝、文件流的操做等。
public static void copyInputStreamToFile(InputStream source, File destination) throws IOException
FileUtils.copyInputStreamToFile方法用于拷贝文件，第一个参数是拷贝文件源的流，正好MultipartFile有一个获取输入流的方法file.getInputStream()。输出的文件流，新建一个本地服务器的文件流，本地文件名是一个时间戳加上MultipartFile的本来的文件名。
咱们继续为上传成功后转发的页面进行添加\WEB-INF\jsps\success.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link rel="stylesheet" href="<%=request.getContextPath()%>/resources/css/main.css" type="text/css"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<div align="center">
<h1>Success!</h1>
</div>
</body>
</html>
接下来，看看实际的运行效果：
请求http://localhost:8080/mvc/courses/upload
选择一个图片文件好了
提交以后，POST请求带着表单数据请求：
控制台输出日志：
经过这个日志输出能够看到:
getOriginalFilename是获得文件本身的名字
getName是获得请求提交的表单中的元素名字
getContentType获得的是文件的类型
getSize获得文件的大小
以后控制器将请求处理以后，转向\WEB-INF\jsps\success.jsp
本地服务器存储的位置也出现了相应的图片文件，命名方法就是咱们本身定义的方式，带时间戳哦。
好，假如我如今上传个超大文件，好比dota2的压缩安装文件：
提交以后，服务就崩溃了：
控制台输出如下错误：
654431 [http-apr-8080-exec-5] WARN org.springframework.web.multipart.commons.CommonsMultipartResolver - Failed to perform multipart cleanup for servlet request org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 209715200 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162) at org.springframework.web.multipart.commons.CommonsMultipartResolver$1.initializeMultipart(CommonsMultipartResolver.java:134) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultipartFiles(AbstractMultipartHttpServletRequest.java:126) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultiFileMap(AbstractMultipartHttpServletRequest.java:106) at org.springframework.web.multipart.commons.CommonsMultipartResolver.cleanupMultipart(CommonsMultipartResolver.java:191) at org.springframework.web.servlet.DispatcherServlet.cleanupMultipart(DispatcherServlet.java:1107) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) ... 33 more 654431 [http-apr-8080-exec-5] WARN org.springframework.web.multipart.commons.CommonsMultipartResolver - Failed to perform multipart cleanup for servlet request org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 209715200 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162) at org.springframework.web.multipart.commons.CommonsMultipartResolver$1.initializeMultipart(CommonsMultipartResolver.java:134) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultipartFiles(AbstractMultipartHttpServletRequest.java:126) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultiFileMap(AbstractMultipartHttpServletRequest.java:106) at org.springframework.web.multipart.commons.CommonsMultipartResolver.cleanupMultipart(CommonsMultipartResolver.java:191) at org.springframework.web.servlet.DispatcherServlet.cleanupMultipart(DispatcherServlet.java:1107) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) ... 33 more 654439 [http-apr-8080-exec-5] DEBUG org.springframework.web.servlet.DispatcherServlet - Could not complete request org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 209715200 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162) at org.springframework.web.multipart.commons.CommonsMultipartResolver$1.initializeMultipart(CommonsMultipartResolver.java:134) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultipartFiles(AbstractMultipartHttpServletRequest.java:126) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getFile(AbstractMultipartHttpServletRequest.java:85) at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.resolveName(RequestParamMethodArgumentResolver.java:169) at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:90) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) ... 40 more 654439 [http-apr-8080-exec-5] DEBUG org.springframework.web.servlet.DispatcherServlet - Could not complete request org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 209715200 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162) at org.springframework.web.multipart.commons.CommonsMultipartResolver$1.initializeMultipart(CommonsMultipartResolver.java:134) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultipartFiles(AbstractMultipartHttpServletRequest.java:126) at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getFile(AbstractMultipartHttpServletRequest.java:85) at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.resolveName(RequestParamMethodArgumentResolver.java:169) at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:90) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (9686027054) exceeds the configured maximum (209715200) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) ... 40 more
这个异常应该如何捕获呢，虽然这种异常不会怎样，也确实证实了springMVC的这个上载文件的组件能够完成对文件大小的限制，可是如何才能捕获这个异常呢？
不要妄想直接在控制器类中捕获，由于，若是直接按照刚才的配置和代码，文件过大抛出异常时，根本就没有到/mvc/courses/doUpload对应的控制器方法doUploadFile就已经结束了。不信，咱们作个实验：
我在方法的开始增长一句日志输出：
@RequestMapping(value="/doUpload", method=RequestMethod.POST)
public String doUploadFile(@RequestParam("file") MultipartFile file) throws IOException {
log.info("step into doUploadFile............................");
if(!file.isEmpty()){
log.info("Process file(getOriginalFilename): {}", file.getOriginalFilename());
log.info("Process file(getName): {}", file.getName());
log.info("Process file(getContentType): {}", file.getContentType());
log.info("Process file(getSize): {}", file.getSize());
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("c:\\temp\\happyBKs\\", System.currentTimeMillis()+ file.getOriginalFilename()));
}
return "success";
}
可是当我像刚才同样上载超大文件，提交表单以后，并无输出过
"step into doUploadFile............................"，也就是说，抛出上载文件过大异常时，程序根本没有进入控制器方法的执行体。那么该怎么办呢？
咱们需要单独为控制器写一个处理异常的方法，用到注解@ExceptionHandler。
@ExceptionHandler(Exception.class)
public void handleException(Exception ex,HttpServletRequest request,HttpServletResponse response){
log.info("step into handleException............................");
StringBuffer sb = new StringBuffer();
sb.append("<script language='javascript'>history.go(-1);alert('");
if (ex instanceof org.springframework.web.multipart.MaxUploadSizeExceededException){
sb.append("文件大小不该大于"+((MaxUploadSizeExceededException)ex).getMaxUploadSize()/1000+"kb");
} else{
sb.append("上传异常！");
}
sb.append("！');</script>");
try {
System.out.println(sb.toString());
response.setContentType("text/html; charset=utf-8");
response.getWriter().println(sb.toString());
response.getWriter().flush();
} catch (IOException e) {
e.printStackTrace();
}
return;
}
当按照刚才的方法上载大文件时，这时候，依然会抛出异常，可是，方法已经能够捕获了并采起措施了：日志输出以下：
好吧，我前端不在行，也懒得弄了，原本是想把这个用浏览器对话框输出的，不过验证了异常可以侦测到并实现相应的操做就已经达到目的了。可是，这里有个使人不解的地方是，我使用IE/EDGE浏览器会出现异常没法抛出的卡死现象，webkit系列的浏览器都可以抛出异常并继续执行异常处理的方法体。
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