[Struts2] 文件上传成功但是出现java.lang.IllegalStateException异常

[nojave]

用<s:file> 上传文件,可以正确上传,但是最后出现java.lang.IllegalStateException错误.直接贴代码了
struts.xml

<action name="savecompany" class="companyAction"
			method="saveCompany">
			<!-- Struts2内置的文件上传拦截器 -->
			<interceptor-ref name="fileUpload">
				<param name="allowedTypes">
					image/bmp,image/gif,image/JPEG,image/pjpeg,image/jpg
				</param>
				<param name="maximumSize">2048000</param>
			</interceptor-ref>
			<interceptor-ref name="defaultStack" />
			<result name="success">/operations.jsp</result>
		</action>

action:

public String saveCompany() {
		System.out.println("upload file");
		// upload file
		HttpServletRequest request = ServletActionContext.getRequest();
		// Get real path
		String realpath = request.getSession().getServletContext().getRealPath(
				"/");
		//save path is a directory
		String savepath = realpath + "images\\" + this.getId();
		String filetype = this.getLogoContentType();
		//create file type
		filetype = filetype.replace("image/", "");
		filetype = filetype.replace("pjpeg", "jpg");
	
		try {
			if (CreatePath(savepath) == false) {
				throw new SystemException("创建文件夹失败，");
			} else {
				//file = save path + logo. + file type 
				String savefile = savepath + "\\" + "logo." + filetype;
				File tarFile = new File(savefile);
				System.out.println(savefile);
				fu.uploadFile(this.getLogo(), tarFile);
			}
		} catch (Exception e) {
			throw new SystemException("文件上传失败，");
		}
		return SUCCESS;
	}

上传文件的Function:

package com.prodinfo.common;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class FileUpload extends ActionSupport implements IFileUpload {

	private static final int BUFFER_SIZE = 2048000;

	public String uploadFile(File src, File target) {
		try {
			FileOutputStream fileout = new FileOutputStream(target);
			FileInputStream filein = new FileInputStream(src);
			byte[] buffer = new byte[BUFFER_SIZE];
			int len = 0;
			while ((len = filein.read(buffer)) > 0) {
				fileout.write(buffer, 0, len);
			}
			fileout.close();
			filein.close();
		} catch (Exception e) {
			throw new SystemException("文件上传失败，");
		}
		return SUCCESS;
	}

}

[海川520]

FileUtils.copyFile(fileResources, destFile);
struts 2文件上传在action我就用这一句就可以了，你配置哪些有什么用
fileResources：为表单的名字；action中定义File类型。File fileResources = null；

destFile：为你要保存的路径：可以自己定义路径 File destFile = new File("c:/");

[nojave]

发现是在action : saveCompany() 执行完毕之后return SUCCESS给struts.xml执行页面跳转时才发生的错误,很纳闷.

[nojave]

问题解决了,是web.xml里多配了一个FORWARD.