Struts2下载

public String scriptDownload() {
		try {
			ToolScript toolScript = evaltoolService.getScriptByScriptId(scriptId);
			downloadFileName = toolScript.getScriptName();
			downloadFileName = URLEncoder.encode(downloadFileName,"utf-8");
			String endSuffix = downloadFileName.substring(downloadFileName.lastIndexOf(".")+1);
			downloadFile = new FileInputStream(FileUtil.generationFileByContent(toolScript.getScriptContent(), downloadFileName, endSuffix, true));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return SUCCESS;
	}
	
	public InputStream getDownloadFile() {
	  return downloadFile;
	}

<action name="scriptDownload" class="evaltoolAction"  method="scriptDownload">
			 <result name="success" type="stream">  
               <param name="contentType">text/plain</param>  
               <param name="contentDisposition">attachment;fileName="${downloadFileName}"</param>  
               <param name="inputName">downloadFile</param>  
               <param name="bufferSize">1024</param>  
           </result>  
		</action>