Struts2实现多文件上传

package com.test.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

	private String username;
	private String password;
	private List<File> file;
	private List<String> fileFileName;
	private List<String> fileContentType;
	
	public List<File> getFile() {
		return file;
	}
	public void setFile(List<File> file) {
		this.file = file;
	}
	public List<String> getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(List<String> fileFileName) {
		this.fileFileName = fileFileName;
	}
	public List<String> getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(List<String> fileContentType) {
		this.fileContentType = fileContentType;
	}

	
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	

	@Override
	public String execute() throws Exception {
		
		for(int i=0; i<file.size(); ++i)
		{
			System.out.println(i);
			InputStream is =new FileInputStream(file.get(i));
			HttpServletRequest request=ServletActionContext.getRequest();
			String root = request.getRealPath("/Upload");
			File destfile=new File(root,this.getFileFileName().get(i));
			OutputStream os=new FileOutputStream(destfile);
			byte[] buffer = new byte[400];
			int length = 0;

			while ((length = is.read(buffer)) > 0)
			{
				os.write(buffer, 0, length);
			}
			os.close();
			is.close();
		}
		return SUCCESS;
	}

}