1.檔案的上傳

  jsp頁面：

<form action="" enctype="multipart/form-data" method="post">
<input type="file"  name="upload" />
</form>

action中

private String File upload;
private String fileName;
private String contentType;

InputStream inputStream=new FileInputStream(upload);

-------------

生成setter,getter方法

2.檔案的下載

 action中

private InputStream inputStream;
------------
setter,getter方法

inputStream=new FileStream("c:/1.png");

xml檔案中

<result name="..." type="stream">
<param name="contentType">
image/png
</param>
<param name="inputName">
inputName
</param>
</result>