📄 入門 29 - 檔案上傳 - javaworld@tw.htm
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<DIV class=pagesubheading>Last changed on Oct 27, 2004 by <A
href="http://www.javaworld.com.tw/confluence/display/~koji">koji
lin</A>
</DIV><!-- page content --> 使用瀏覽器進行檔案上傳時，是使用multipart/form-data編碼，然而
Servlet容器並不會自動幫我們處理編碼，而必須由程式設計人員自行處理，在這個部份，Struts中提供了檔案上傳的套件，使用它就可以輕易的解決檔案上傳的問題，首先請確定commons-fileupload.jar有在WEB-INF/lib目錄下。<BR> 與檔案上傳相關的類別是在org.apache.struts.upload套件下，首先我們撰寫簡單的ActionForm，以接收上傳的檔案：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeHeader
style="BORDER-BOTTOM-STYLE: solid"><B>UploadForm.java</B></DIV>
<DIV class=codeContent><PRE><SPAN class=java-keyword>package</SPAN> onlyfun.caterpillar;
<SPAN class=java-keyword>import</SPAN> javax.servlet.http.*;
<SPAN class=java-keyword>import</SPAN> org.apache.struts.action.*;
<SPAN class=java-keyword>import</SPAN> org.apache.struts.upload.*;
<SPAN class=java-keyword>public</SPAN> class UploadForm <SPAN class=java-keyword>extends</SPAN> ActionForm {
<SPAN class=java-keyword>private</SPAN> FormFile file;
<SPAN class=java-keyword>public</SPAN> void setFile(FormFile file) {
<SPAN class=java-keyword>this</SPAN>.file = file;
}
<SPAN class=java-keyword>public</SPAN> FormFile getFile() {
<SPAN class=java-keyword>return</SPAN> file;
}
<SPAN class=java-keyword>public</SPAN> void reset(ActionMapping mapping, HttpServletRequest req) {
file = <SPAN class=java-keyword>null</SPAN>;
}
}</PRE></DIV></DIV><BR> 檔案經由表單上傳至伺服器之後，會儲存為FormFile型態的物件，您可以藉由這個物件來取得上傳檔案的相關訊息，例如
getContentType()、getFileName()、getFileSize()等等，getFileData()可以取得檔案的位元陣列資料，getInputStream()可以取得InputStream型態之物件，我們撰寫一個簡單的Action，將接收到的檔案儲存下來：
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