Tomcat配置
HTTP Connector - maxPostSize配置
maxPostSize: 在POST请求中容器FORMURL参数解析所能处理的最大字节数。该参数可以通过设置为小于零的负值禁掉该限制。如果没有设置，该属性为2097152(2M字节)。
该配置可在$CATALINA_BASE/conf/server.xml内修改:
Tomcat 7.0.63之前maxPostSzie=“0"视为禁掉该限制。
multipart-config配置
max-file-size: 单个上传文件允许的最大字节数。默认-1，无限制。 max-request-size: 真个请求允许的最大字节数。默认-1，无限制。
这两个配置可在web.xml内修改：
如果上传文件超过限制，则会抛出Exception。示例：
org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (61198097) exceeds the configured maximum (20971520)
at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.(FileUploadBase.java:811)
at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256)
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280)
at org.apache.catalina.connector.Request.parseParts(Request.java:2730)
at org.apache.catalina.connector.Request.parseParameters(Request.java:3064)
at org.apache.catalina.connector.Request.getParameter(Request.java:1093)
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:380)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:70)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:68)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
通过org.apache.tomcat.util.http.fileupload.FileUploadBase源代码可知，Tomcat中对应属性为fileSizeMax和sizeMax。 这两个参数也可以在Spring代码通过annotation设置：
@WebServlet(name = "fileUploadServlet", urlPatterns = {"/upload"})
@MultipartConfig(location="/tmp",
fileSizeThreshold=0,
maxFileSize=5242880, // 5 MB
maxRequestSize=20971520) // 20 MB
public class FileUploadServlet extends HttpServlet {
protected void doPost(
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//handle file upload
}
Spring Boot与Embeded Tomcat
通过org.springframework.boot.autoconfigure.web.MultipartProperties源代码可知，其maxFileSize默认为"1Mb”， maxRequestSize默认为"10Mb"。 通过org.springframework.boot.context.embedded.MultipartConfigFactory源代码可知，其maxFileSize默认为-1，maxRequestSize默认为-1。 值得注意的是，这两个默认值与The Java EE 6 Tutorial描述一致，与org.springframework.boot.autoconfigure.web.MultipartProperties源代码是不一致的。 可以通过如下代码，完成HTTP Connector - maxPostSize配置和MultiPartConfig配置。
@SpringBootApplication
public class Application {
@Autowired
private MultipartConfigElement _multipartConfigElement;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Bean
public ServletRegistrationBean dispatcherRegistration(
DispatcherServlet dispatcherServlet) {
ServletRegistrationBean registration =
new ServletRegistrationBean(
dispatcherServlet);
registration.addUrlMappings("/tmp");
registration.setMultipartConfig(_multipartConfigElement);
return registration;
}
@Bean
public EmbeddedServletContainerCustomizer containerCustomizer()
throws FileNotFoundException {
return new EmbeddedServletContainerCustomizer() {
@Override
public void customize(ConfigurableEmbeddedServletContainer container) {
if(container instanceof TomcatEmbeddedServletContainerFactory) {
TomcatEmbeddedServletContainerFactory containerFactory =
(TomcatEmbeddedServletContainerFactory) container;
containerFactory.addConnectorCustomizers(
new TomcatConnectorCustomizer(){
@Override
public void customize(Connector connector) {
connector.setMaxPostSize(-1);
}
});
}
};
};
}
@Bean
public MultipartConfigElement multipartConfigElement() {
MultipartConfigElement retval = null;
MultipartConfigFactory factory = new MultipartConfigFactory();
factory.setMaxFileSize("5M");
factory.setMaxRequestSize("20M");
retval = factory.createMultipartConfig();
return retval;
}
}
参考
Apache Tomcat Configuration Reference - The HTTP Connector
Tomcat settings: maxPostSize
Spring guides：uploading files
Spring MVC 4 File Upload Example using Servlet 3 MultiPartConfigElement
Spring 4 Java Config for MultipartResolver for Servlet 3.0