struts文件上传主要的文件有：
2个jsp文件uploadIndex.jsp和uploadSuccess.jsp文件；FileUploadAction.java；FileUploadActionForm.java；struts-config.xml；web.xml；
1、uploadIndex.jsp 注意：form中method="post" ；enctype="multipart/form-data"
<%@ page language="java" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>测试Strust文件上传</title>
</head>
<body>
<form action="fileupload.do" method="post" enctype="multipart/form-data" >
<table>
标题：<input type="text" name="title"/>
<input type="file" name="myfile"/>
<input type="submit" value="上传"/>
</table>
</form>
</body>
</html>
2、uploadSuccess.jsp
1 <%@ page language="java" pageEncoding="gb2312"%>
2 <%@ page isELIgnored="false" %>
3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <html>
5 <head>
6 <title>uploadSuccess.jsp</title>
7 </head>
8 <body>
9 文件标题：${fileupload.title }<br>
10 文件名：${fileupload.myfile.fileName }<br>
11 文件大小：${fileupload.myfile.fileSize}<br>
12 </body>
13 </html>
14
3、FileUploadActionForm.java
1 package com.eplugger.struts.form;
2 import org.apache.struts.action.ActionForm;
3 import org.apache.struts.upload.FormFile;
4 public class FileUploadActionForm extends ActionForm {
5 private String title;
6 private FormFile myfile; //注意：上传文件的类型必须是FormFile；它是struts提供的；
7 public String getTitle() {
8 return title;
9 }
10 public void setTitle(String title) {
11 this.title = title;
12 }
13 public FormFile getMyfile() {
14 return myfile;
15 }
16 public void setMyfile(FormFile myfile) {
17 this.myfile = myfile;
18 }
19 }
20
4、FileUploadAction.java
package com.eplugger.struts.action;
import java.io.FileOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;
import com.eplugger.struts.form.FileUploadActionForm;
public class FileUploadAction extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//获得form
FileUploadActionForm fpaf =(FileUploadActionForm)form;
//获得通过form传来的title值；
String title = fpaf.getTitle();
//获得通过form传来的文件；注意类型必须是FormFile；
FormFile myFile = fpaf.getMyfile();
if(myFile != null ){
//创建文件输出的路径
FileOutputStream fos= new FileOutputStream("e:\\"+myFile.getFileName());
//输出（一个bayt[]数组）
fos.write(myFile.getFileData());
//把内存中的文件变成物理的
fos.flush();
//关闭
fos.close();
}
request.setAttribute("title","title");
return mapping.findForward("success");
}
}
5、struts-config.xml
<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
<form-beans>
<form-bean name="fileupload" type="com.eplugger.struts.form.FileUploadActionForm"/>
</form-beans>
<action-mappings>
<action path="/fileupload"
type="com.eplugger.struts.action.FileUploadAction"
name="fileupload"
scope="request"
>
<forward name="success" path="/uploadSuccess.jsp"/>
</action>
</action-mappings>
<controller maxFileSize="10M"/>
</struts-config>
6.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<!-- Default -->
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
最后说一下，关于文件的大小等参数都可以再struts-config.xml文件中的<controller />中配置，可以配置的属性可以参考struts-core-1.3.10.jar中的org.apache.struts.resources.struts-config_1_3.dtd
主要内容如下：
<!-- The "controller" element describes the ControllerConfig bean
[org.apache.struts.config.ControllerConfig] that encapsulates
a module's runtime configuration. The following
attributes are defined:
bufferSize The size of the input buffer used when processing
file uploads.
[4096]
catalog Name of the catalog to use when processing requests
for this module.
[struts]
className Fully qualified Java class name of the
ControllerConfig subclass for this controller object.
If specified, the object must be a subclass of the
default class.
["org.apache.struts.config.ControllerConfig"]
command Name of the command to execute to process a request.
[servlet-standard]
contentType Default content type (and optional character encoding) to
be set on each response. May be overridden by the Action,
JSP, or other resource to which the request is forwarded.
["text/html"]
forwardPattern Replacement pattern defining how the "path" attribute of a
<forward> element is mapped to a context-relative URL when
it starts with a slash (and when the contextRelative
property is false). This value may consist of any
combination of the following:
- "$M" - Replaced by the module prefix of this module
- "$P" - Replaced by the "path" attribute of the selected
"forward" element
- "$$" - Causes a literal dollar sign to be rendered
- "$x" - (Where "x" is any character not defined above)
Silently swallowed, reserved for future use
If not specified, the default forwardPattern is "$M$P",
which is consistent with the previous behavior of
forwards. Since Struts 1.1. ["$M$P"]
inputForward Set to "true" if you want the "input" attribute of
<action> elements to be the name of a local or global
ActionForward, which will then be used to calculate the
ultimate URL. Set to "false" (the default) to treat the
"input" parameter of <action> elements as a
module-relative path to the resource
to be used as the input form. Since Struts 1.1.
[false]
locale Set to "true" if you want a Locale object stored in the
user's session if not already present.
[true]
maxFileSize The maximum size (in bytes) of a file to be accepted as a
file upload. Can be expressed as a number followed by a
"K", "M", or "G", which are interpreted to mean kilobytes,
megabytes, or gigabytes, respectively.
["250M"]
memFileSize The maximum size (in bytes) of a file whose contents will
be retained in memory after uploading. Files larger than
this threshold will be written to some alternative storage
medium, typically a hard disk. Can be expressed as a number
followed by a "K", "M", or "G", which are interpreted to
mean kilobytes, megabytes, or gigabytes, respectively.
["256K"]
multipartClass The fully qualified Java class name of the multipart
request handler class to be used with this module.
["org.apache.struts.upload.CommonsMultipartRequestHandler"]
nocache Set to "true" if you want the controller to add HTTP
headers for defeating caching to every response from
this module. [false]
pagePattern Replacement pattern defining how the "page" attribute of
custom tags using it is mapped to a context-relative URL
of the corresponding resource. This value may consist of
any combination of the following:
- "$M" - Replaced by the module prefix of this module
- "$P" - Replaced by the value of the "page" attribute
- "$$" - Causes a literal dollar sign to be rendered
- "$x" - (Where "x" is any character not defined above)
Silently swallowed, reserved for future use
If not specified, the default forwardPattern is
"$M$P", which is consistent with previous hard coded
behavior of URL evaluation for "page" attributes.
["$M$P"]
processorClass The fully qualified Java class name of the
RequestProcessor subclass to be used with this module.
["org.apache.struts.chain.ComposableRequestProcessor"]
tempDir Temporary working directory to use when processing
file uploads.
[{Directory provided by servlet container}]
-->