偶遇struts1.2文件下传

偶遇struts1.2文件上传

原文地址：http://www.java3z.com/cwbwebhome/article/article1a/168.html

这是学struts1.2.4自带的例子。所有文件及目录结构请在本站下载。

一、web.xml配置，这里将文件上传配置为upload模块。

<?xml?version="1.0"?encoding="iso-8859-1"?>
<!DOCTYPE?web-app
??PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.2//EN"
??"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
?<display-name>Struts?Blank?Application</display-name>
??
??
??<servlet>
????<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
????<init-param>
??????<param-name>config</param-name>
??????<param-value>/WEB-INF/struts-config.xml</param-value>
????</init-param>
????<init-param>
??????<param-name>config/upload</param-name>
????<param-value>/WEB-INF/upload/struts-config.xml</param-value>
????</init-param> <script type="text/javascript"></script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"> </script><script>google_protectAndRun("ads_core.google_render_ad", google_handleError, google_render_ad);</script>

????<init-param>
??????<param-name>debug</param-name>
??????<param-value>2</param-value>
????</init-param>
????<init-param>
??????<param-name>detail</param-name>
??????<param-value>2</param-value>
????</init-param>
????<load-on-startup>2</load-on-startup>
??</servlet>

??
??<servlet-mapping>
????<servlet-name>action</servlet-name>
????<url-pattern>*.do</url-pattern>
??</servlet-mapping>

??
??<welcome-file-list>
????<welcome-file>index.jsp</welcome-file>
??</welcome-file-list>

??
??<taglib>
????<taglib-uri>/tags/struts-bean</taglib-uri>
????<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
??</taglib>

??<taglib>
????<taglib-uri>/tags/struts-html</taglib-uri>
????<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
??</taglib>

??<taglib>
????<taglib-uri>/tags/struts-logic</taglib-uri>
????<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
??</taglib>

??<taglib>
????<taglib-uri>/tags/struts-nested</taglib-uri>
????<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
??</taglib>

??<taglib>
????<taglib-uri>/tags/struts-tiles</taglib-uri>
????<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
??</taglib>

</web-app>

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

二、struts-config.xml配置和资源文件

--------------------------------------------
<?xml?version="1.0"?encoding="iso-8859-1"?>

<!DOCTYPE?struts-config?PUBLIC
??????????"-//Apache?Software?Foundation//DTD?Struts?Configuration?1.2//EN"
??????????"http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>
??<form-beans>
????<form-bean?name="uploadForm"?type="org.apache.struts.webapp.upload.UpLoadForm"?/>
??</form-beans>
??<action-mappings>
????<action?path="/upload"?forward="/selfile.jsp"?/>
????
????<action?path="/uploadsAction"?
????????????type="org.apache.struts.webapp.upload.UpLoadAction"???
????????????name="uploadForm"?scope="request"?input="input">
??????<forward?name="input"?path="/selfile.jsp"?/>
??????<forward?name="display"?path="/display.jsp"?/>
????</action>
??</action-mappings>
??
??<controller?maxFileSize="2M"?inputForward="true"?/>
??<message-resources?parameter="org.apache.struts.webapp.upload.UploadResources"/>

</struts-config>

??资源文件：UploadResources_zh_CN.properties
maxLengthExceeded=已经超过了上传文件所允许的最大值。
maxLengthExplanation=注意：这个应用程序允许上传文件的最大值是2M。请看"/WEB-INF/upload/struts-config.xml"?文件更改这个值。

三、选择上传文件页面：selfile.jsp，如此访问此页面：
<html:link?module="/upload"?page="/upload.do">?继续上传</html:link></h2>

--------------------------------------------
<%@?page?contentType="text/html;?charset=GBK"?%>
<%@?page?import="org.apache.struts.action.*,
?????????????????java.util.Iterator,
?????????????????org.apache.struts.Globals"?%>
<%@?taglib?uri="/tags/struts-bean"?prefix="bean"?%>
<%@?taglib?uri="/tags/struts-html"?prefix="html"?%>
<%@?taglib?uri="/tags/struts-logic"?prefix="logic"?%>
<logic:messagesPresent>
???<ul>
???<html:messages?id="error">
??????<li><bean:write?name="error"/></li>
???</html:messages>
???</ul><hr?/>
</logic:messagesPresent>
<html:html>

<html:form?action="uploadsAction.do"?enctype="multipart/form-data">
<html:file?property="theFile"/>
<html:submit/>
</html:form>
</html:html>

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

四、表单bean:??UpLoadForm.java

--------------------------------------------
package?org.apache.struts.webapp.upload;
import?javax.servlet.http.HttpServletRequest;
import?org.apache.struts.action.*;
import?org.apache.struts.upload.*;

/**
?*?<p>Title:UpLoadForm</p>
?*?<p>Description:?QRRSMMS?</p>
?*?<p>Copyright:?Copyright?(c)?2004?jiahansoft</p>
?*?<p>Company:?jiahansoft</p>
?*?@author?wanghw
?*?@version?1.0
?*/

public?class?UpLoadForm?extends?ActionForm?{
??public?static?final?String?ERROR_PROPERTY_MAX_LENGTH_EXCEEDED?=?"org.apache.struts.webapp.upload.MaxLengthExceeded";
??protected?FormFile?theFile;
??public?FormFile?getTheFile()?{
??????return?theFile;
??}
??public?void?setTheFile(FormFile?theFile)?{
??????this.theFile?=?theFile;
??}
???public?ActionErrors?validate(
????????ActionMapping?mapping,
????????HttpServletRequest?request)?{
????????????
????????ActionErrors?errors?=?null;
????????//has?the?maximum?length?been?exceeded?
????????Boolean?maxLengthExceeded?=
????????????(Boolean)?request.getAttribute(
????????????????MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
????????????????
????????if?((maxLengthExceeded?!=?null)?&&?(maxLengthExceeded.booleanValue()))?{
????????????errors?=?new?ActionErrors();
????????????errors.add(
????????????????ActionMessages.GLOBAL_MESSAGE?,
????????????????new?ActionMessage("maxLengthExceeded"));
????????????errors.add(
????????????????ActionMessages.GLOBAL_MESSAGE?,
????????????????new?ActionMessage("maxLengthExplanation"));
????????}
????????return?errors;

????}

}

--------------------------------------------
五、处理上传的文件：UpLoadAction.java?
--------------------------------------------
package?org.apache.struts.webapp.upload;
import?java.io.*;
import?javax.servlet.http.*;
import?org.apache.struts.action.*;
import?org.apache.struts.upload.FormFile;?

/**
?*?<p>Title:UpLoadAction</p>
?*?<p>Description:?QRRSMMS?</p>
?*?<p>Copyright:?Copyright?(c)?2004?jiahansoft</p>
?*?<p>Company:?jiahansoft</p>
?*?@author?wanghw
?*?@version?1.0
?*/

public?class?UpLoadAction?extends?Action?{
??public?ActionForward?execute(ActionMapping?mapping,
???????????????????????????????ActionForm?form,
???????????????????????????????HttpServletRequest?request,
???????????????????????????????HttpServletResponse?response)
??????throws?Exception?{
???????if?(form?instanceof?UpLoadForm)?{//如果form是UpLoadsForm
???????????String?encoding?=?request.getCharacterEncoding();

???????if?((encoding?!=?null)?&&?(encoding.equalsIgnoreCase("utf-8")))
????????{
????????????response.setContentType("text/html;?charset=gb2312");
????????}
????????UpLoadForm?theForm?=?(UpLoadForm?)?form;
????????FormFile?file?=?theForm.getTheFile();//取得上传的文件
????????String?contentType?=?file.getContentType();

????????String?size?=?(file.getFileSize()?+?"?bytes");//文件大小
????????String?fileName=?file.getFileName();//文件名
????????try?{
??????????InputStream?stream?=?file.getInputStream();//把文件读入
??????????String?filePath?=?request.getRealPath("/");//取当前系统路径
??????????ByteArrayOutputStream?baos?=?new?ByteArrayOutputStream();
??????????OutputStream?bos?=?new?FileOutputStream(filePath?+?"/"?+
??????????????????????????????????????????????????file.getFileName());
??????????????//建立一个上传文件的输出流，将上传文件存入web应用的根目录。
??????????//System.out.println(filePath+"/"+file.getFileName());
??????????int?bytesRead?=?0;
??????????byte[]?buffer?=?new?byte[8192];
??????????while?(?(bytesRead?=?stream.read(buffer,?0,?8192))?!=?-1)?{
????????????bos.write(buffer,?0,?bytesRead);//将文件写入服务器
??????????}
??????????bos.close();
??????????stream.close();
????????}catch(Exception?e){
??????????System.err.print(e);
????????}
????????//request.setAttribute("dat",file.getFileName());
?????????request.setAttribute("contentType",?contentType);
?????????request.setAttribute("size",?size);
?????????request.setAttribute("fileName",?fileName);

????????return?mapping.findForward("display");
????}
????return?null;
??}
}
------------------------------------------------------

五、成功页display.jsp?
<%@?page?contentType="text/html;?charset=GBK"?%>
<%@?page?import="org.apache.struts.action.*,
?????????????????java.util.Iterator,
?????????????????org.apache.struts.Globals"?%>
<%@?taglib?uri="/tags/struts-html"?prefix="html"?%>

上传成功！上传信息如下：
<p>
<b>The?File?name:</b>?<%=?request.getAttribute("fileName")?%>
</p>
<p>
<b>The?File?content?type:</b>?<%=?request.getAttribute("contentType")?%>
</p>
<p>
<b>The?File?size:</b>?<%=?request.getAttribute("size")?%>
</p>
<hr?/>
<hr?/>
<html:link?module="/upload"?page="/upload.do">?继续上传</html:link></h2>
?六、测试
?从本站下载整个目录结构TestStruts并放入tomcat的webapps目录下，在浏览器中输入：
http://127.0.0.1:8080/TestStruts/upload/upload.do

偶遇struts1.2文件下传

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