struts2文件下传Action

struts2文件上传Action
package cn.itcast.action;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;


public class HelloWorldAction {
private File image;
private String imageFileName;

public String getImageFileName() {
return imageFileName;
}

public void setImageFileName(String imageFileName) {
this.imageFileName = imageFileName;
}

public File getImage() {
return image;
}

public void setImage(File image) {
this.image = image;
}

public String addUI(){
return "success";
}

public String execute() throws Exception{

String realpath = ServletActionContext.getServletContext().getRealPath("/images");
System.out.println(realpath);
if(image!=null){
File savefile = new File(new File(realpath), imageFileName);
if(!savefile.getParentFile().exists()) savefile.getParentFile().mkdirs();
FileUtils.copyFile(image, savefile);
ActionContext.getContext().put("message", "上传成功");
}
return "success";
}
}