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📄 在struts 2中实现文件上传 - max on java - blogjava.htm

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href="http://www.blogjava.net/max/archive/2007/03/21/105124.html">在Struts 
2中实现文件上传</A> </DIV>
<P>前一阵子有些朋友在电子邮件中问关于Struts 2实现文件上传的问题， 所以今天我们就来讨论一下这个问题。</P>
<H2>实现原理</H2>
<P>Struts 2是通过Commons FileUpload文件上传。Commons 
FileUpload通过将HTTP的数据保存到临时文件夹，然后Struts使用fileUpload拦截器将文件绑定到Action的实例中。从而我们就能够以本地文件方式的操作浏览器上传的文件。</P>
<H2>具体实现</H2>
<P>前段时间Apache发布了Struts 2.0.6 GA，所以本文的实现是以该版本的Struts作为框架的。以下是例子所依赖类包的列表：</P>
<P><IMG alt=依赖类包的列表 
src="在Struts 2中实现文件上传 - Max On Java - BlogJava.files/r_img1.gif">&nbsp;<BR><SPAN 
style="FONT-SIZE: smaller; FONT-STYLE: italic">清单1 依赖类包的列表</SPAN></P>
<P>首先，创建文件上传页面FileUpload.jsp，内容如下：</P>
<DIV 
style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">&lt;%</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@ page language</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">java</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">contentType</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">text/html; 
charset=utf-8</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">pageEncoding</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">utf-8</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"></SPAN><SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%&gt;</SPAN> <SPAN 
style="COLOR: #000000"><BR></SPAN><SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">&lt;%</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@ taglib prefix</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">s</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">uri</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">/struts-tags</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN> <SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"></SPAN><SPAN 
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%&gt;</SPAN> <SPAN 
style="COLOR: #000000"><BR><BR></SPAN><SPAN style="COLOR: #0000ff">&lt;!</SPAN> 
<SPAN style="COLOR: #ff00ff">DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 
Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</SPAN> <SPAN 
style="COLOR: #0000ff">&gt;</SPAN> <SPAN style="COLOR: #000000"><BR></SPAN><SPAN 
style="COLOR: #0000ff">&lt;</SPAN> <SPAN style="COLOR: #800000">html 
</SPAN><SPAN style="COLOR: #ff0000">xmlns</SPAN> <SPAN 
style="COLOR: #0000ff">="http://www.w3.org/1999/xhtml"</SPAN> <SPAN 
style="COLOR: #0000ff">&gt;</SPAN> <SPAN style="COLOR: #000000"><BR></SPAN><SPAN 
style="COLOR: #0000ff">&lt;</SPAN> <SPAN style="COLOR: #800000">head</SPAN> 
<SPAN style="COLOR: #0000ff">&gt;</SPAN> <SPAN style="COLOR: #000000"><BR>&nbsp; 
&nbsp; </SPAN><SPAN style="COLOR: #0000ff">&lt;</SPAN> <SPAN 
style="COLOR: #800000">title</SPAN> <SPAN style="COLOR: #0000ff">&gt;</SPAN> 
<SPAN style="COLOR: #000000">Struts 2 File Upload</SPAN> <SPAN 
style="COLOR: #0000ff">&lt;/</SPAN> <SPAN style="COLOR: #800000">title</SPAN> 
<SPAN style="COLOR: #0000ff">&gt;</SPAN> <SPAN 
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff">&lt;/</SPAN>
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