struts2上传与下载

1.action代码：

/**
 * 文件处理的底层action 供需要处理文件的action继承
 * @author xxx
 * @date 2014-10-14
 * @time 下午3:24:33
 * @version 1.0
 */
@SuppressWarnings("serial")
public abstract class FileAction extends AbstractAction{

	private static Logger logger = Logger.getLogger(FileAction.class);
	/** 文件名*/
	public String uploadFileName;
	/** 上传文件属性,与页面中type=file中定义name的保持一致*/
	private File upload;
	/**导入文件的保存目录*/
	private String savePath="/upload"+File.separator+DateUtil.getSysDateStr();
	/**导入模板的保存目录*/
	private String modelPath="/model";
	/**文件最终保存路径*/
	private String targetPath;
	/**文件下载路径*/
	private String filePath;
	
	/**
	 * 上传文件
	 */
	public String uploadFile() 
	{
		FileInputStream in = null;
		FileOutputStream out = null;
		if(Detect.notEmpty(uploadFileName))
		{
			String directoryName = getSavePath();
			File dir = new File(directoryName);
			if (!dir.exists())
			{
				boolean flag = dir.mkdir();
				if(!flag)
				{
					logger.error("文件保存路径"+directoryName+"不存在且自动创建失败，请先手工创建");
					return ERROR;
				}
			}
			targetPath = dir.getPath() + File.separator + uploadFileName;
			File uploadDestination = new File(targetPath);
			try {
				in = new FileInputStream(upload);
				out = new FileOutputStream(uploadDestination);
				int c;
				while ((c = in.read()) != -1) {
					out.write(c);
				}
			}catch (IOException e) {
				e.printStackTrace();
				logger.error("上传文件失败"+e.getMessage());
				return ERROR;
			}
			finally {
				if (in != null) {
					try {
						in.close();
					} catch (IOException e) {
						e.printStackTrace();
						logger.error("关闭Input流失败"+e.getMessage());
						return WebConstant.ERROR;
					}finally{
						in = null;
					}
				}
				if (out != null) {
					try {
						out.close();
					} catch (IOException e) {
						e.printStackTrace();
						logger.error("关闭Output流失败"+e.getMessage());
						return ERROR;
					}finally{
						out = null;
					}
				}
			}
		}
		else
		{
			logger.error("请选择上传的文件");
			return INPUT;
		}
		logger.info("文件上传成功,保存路径为:"+targetPath);
		return SUCCESS;
	}
	
	/**
	 * 下载文件
	 */
	public String downloadFile()
	{
		HttpServletResponse response = ServletActionContext.getResponse();
		if(Detect.notEmpty(filePath))
		{
			boolean result = exportFile(response, filePath);
			if(result){
				logger.info("下载成功");
				return SUCCESS;
			}else
			{
				logger.warn("下载失败");
				return ERROR;
			}
		}else{
			return ERROR;
		}
	}

	/**
	 * 文件导出
	 * @param response
	 * @param filePath
	 * @return
	 */
	private boolean exportFile(HttpServletResponse response,String filePath) 
	{
		DataInputStream dis = null;
		OutputStream toClient = null;
		try
		{
			File file = new File(filePath); // 取得要传送的文件
			String fileName = file.getName();
			dis = new DataInputStream(new FileInputStream(file));
			byte[] b = new byte[1024];
			long totalsize = 0;
			long filelength = file.length(); // 文件长度
			response.reset();// 清空response
			// 设置响应头信息，让下载的文件显示保存信息
			response.addHeader("Content-Disposition", "attachment; filename=\""
					+ new String(fileName.getBytes("GBK"), "ISO8859_1"));
			response.addHeader("Content-length", "" + filelength);
			toClient = new BufferedOutputStream(response.getOutputStream());
			response.setContentType("application/octet-stream");
			// 发送文件数据，每次1024字节，最后一次单独计算
			while (totalsize < filelength){
				totalsize += 1024;
				if (totalsize > filelength)
				{ // 最后一次传送的字节数
					byte[] leftpart = new byte[1024 - (int)(totalsize - filelength)];
					dis.readFully(leftpart);
					toClient.write(leftpart);
				} else{
					dis.readFully(b); // 读1024个字节至字节数组b
					toClient.write(b);
				}
			}
			toClient.flush();
			toClient.close();
			dis.close();
		} catch (Exception e){
			e.printStackTrace();
			return false;
		} finally{
			if (null != toClient){
				try{
					toClient.close();
					toClient = null;
				} catch (IOException e){
					e.printStackTrace();
				}
			}
			if (null != dis){
				try{
					dis.close();
					dis = null;
				} catch (IOException e){
					e.printStackTrace();
				}
			}
		}
		return true;
	}
	
	public String getSavePath() {
		return ServletActionContext.getServletContext().getRealPath(this.savePath);
	}
	public String getModelPath()
	{
		return ServletActionContext.getServletContext().getRealPath(this.modelPath);
	}
	public void setSavePath(String savePath) {
		this.savePath = savePath;
	}
	public void setModelPath(String modelPath)
	{
		this.modelPath = modelPath;
	}
	public String getTargetPath() {
		targetPath=org.apache.commons.lang.StringUtils.replaceChars(targetPath, '\\', '/');
		return targetPath;
	}
	public void setTargetPath(String targetPath) {
		this.targetPath = targetPath;
	}
	public String getUploadFileName() {
		return uploadFileName;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}
	public File getUpload() {
		return upload;
	}
	public void setUpload(File upload) {
		this.upload = upload;
	}
	public String getFilePath()
	{
		return filePath;
	}
	public void setFilePath(String filePath)
	{
		this.filePath = filePath;
	}

jsp页面：上传和下载都需要from表单提
上传：
<form action="" method="post" enctype="multipart/form-data" id="csvform">文件:
<input type='file' onchange="xxx()" id="upload" name="upload" >
<a class="easyui-linkbutton" href="javascript:importFile()" icon="icon-import" style="margin:10px 25px;">导入数据</a>
<a class="easyui-linkbutton" href="javascript:clearFile()" icon="icon-checkbox" >清除文件</a>
</form>
$('#csvform').attr("action", actionName);//动态给form