在做項目中上傳下載肯定是少不了的，本博文對struts2的下載進行解釋並附上部分代碼

1、action類

public class FileDownLoadAction extends ActionSupport{
	private String filename;//下載文件的名稱
	
	@Override
	public String execute() throws Exception {
		return SUCCESS;
	}
	//下載源
    public InputStream getInputStream() throws IOException{
    	String path =ServletActionContext.getServletContext().getRealPath(filename);//獲取文件路徑
    	//System.out.println("path="+path);
		File file = new File(path);
		return FileUtils.openInputStream(file);
	}
    //下載文件名
	public String getDownloadFileName() throws Exception{
		String downloadFileName="";
		String []filenames=filename.split("/");
		//System.out.println(filenames[filenames.length-1]);
		downloadFileName=URLEncoder.encode(filenames[filenames.length-1], "UTF-8");//解決下載中文命名文件亂碼問題
	    return downloadFileName;
	}
	///////////////////////////////////////////字段封裝//////////////
	public String getFilename() {
		return filename;
	}
	public void setFilename(String filename) {
		this.filename = filename;
	}
}

2、struts2.xml配置

<action name="download" class="com.zzuli.student.action.FileDownLoadAction">
		<!--以流的方式返回  -->
		<result name="success" type="stream">
		<!--文件流  -->
         <param name="contentType">application/octet-stream</param>
         <!--下載源  -->
         <param name="inputName">InputStream</param>
         <!--以附件方式下載  downloadFileName相應Action類getDownloadFileName() -->
         <param name="contentDisposition">attachment;filename="${downloadFileName}"</param>
         <!--緩沖流大小  -->
         <param name="bufferSize">8192</param>
         </result>

3、jsp下載鏈接頁面

<td>
<a href="download.action?filename=${documentUrl}">點擊下載</a>
</td>

Struts文件下載具體解釋