我难道那里写错了吗？

[Gemerl]

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">
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

html：

<h3>上传文件</h3>
    <form action="photoAction.action" method="post" enctype="application/x-www-form-urlencoded">
    	<input type="file" name="photo" /><br/>
    	<input type="submit" value="提交"/>
    </form>

action：

import com.jspsmart.upload.File;
import com.opensymphony.xwork2.ActionSupport;

public class PhotoAction extends ActionSupport{
	private File photo;

	public File getPhoto() {
		return photo;
	}

	public void setPhoto(File photo) {
		this.photo = photo;
	}
	
	@Override
	public String execute() throws Exception {
		System.out.println(photo);
		System.out.println(photo.getFilePathName());
		return SUCCESS;
	}
}

struts.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <constant name="struts.devMode" value="true" />	<!--开发模式无需重启服务器-->
    <constant name="struts.ui.theme" value="simple" />  <!--//<S:>标签简单风格-->
      
    <package name="default" namespace="/" extends="struts-default">
		
		
		<action name="photoAction" class="com.action.PhotoAction">
		    <result>success.jsp</result>
		</action>
    </package>

</struts>

jar：
asm-3.3.jar
asm-commons-3.3.jar
asm-tree-3.3.jar
commons-fileupload-1.2.2.jar
commons-io-2.0.1.jar
commons-lang3-3.1.jar
freemarker-2.3.19.jar
javassist-3.11.0.GA.jar
jspsmartupload.jar
ognl-3.0.5.jar
struts2-core-2.3.3.jar
xwork-core-2.3.3.jar

为什么一直报错：No result defined for action com.action.PhotoAction and result input

[partys]

<result name="success">success.jsp</result> success.jsp也应该是相对路径

[侠龙]

少了应该还要配置一个struts2自带的文件上传拦截器，叫fileupload

[JAVA_单线程]

<result>/success.jsp</result>

[文森特先森]

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <constant name="struts.devMode" value="true" />	<!--开发模式无需重启服务器-->
    <constant name="struts.ui.theme" value="simple" />  <!--//<S:>标签简单风格-->
      
    <package name="default" namespace="/" extends="struts-default">
		
		
		<action name="photoAction" class="com.action.PhotoAction">
		    <result>success.jsp</result>
                    <interceptor-ref name="defaultStack" />
		</action>
    </package>

</struts>

[ZHOU西口]

你的问题是不是photo是空的，报空指针？