一、web.xml配置，這裏將文件上傳配置爲upload模塊。
<?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>
<!-- Standard Action Servlet Configuration (with debugging) -->
<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>
<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>
<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- The Usual Welcome File List -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- Struts Tag Library Descriptors -->
<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>
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二、struts-config.xml配置和資源文件
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<?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" />
<!-- Upload Action -->
<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>
<!-- 這裏設置上傳文件的最大值。 -1 不限制大小。缺省值：-1 -->
<controller maxFileSize="2M" inputForward="true" />
<message-resources parameter="org.apache.struts.webapp.upload.UploadResources"/>
</struts-config>
資源文件：UploadResources_zh_CN.properties
maxLengthExceeded=已經超過了上傳文件所允許的最大值。
maxLengthExplanation=注意：這個應用程序允許上傳文件的最大值是2M。請看"/WEB-INF/upload/struts-config.xml" 文件更改這個值。
三、選擇上傳文件頁面：selfile.jsp，如此訪問此頁面：
<html:link module="/upload" page="/upload.do"> 繼續上傳</html:link></h2>
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<%@ 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>
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四、表單bean: UpLoadForm.java
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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;
}
}
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五、處理上傳的文件：UpLoadAction.java
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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();//取得上傳的文件
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();//把文件讀入
String filePath = request.getRealPath("/");//取當前系統路徑
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream bos = new FileOutputStream(filePath + "/" +
file.getFileName());
//建立一個上傳文件的輸出流，將上傳文件存入web應用的根目錄。
//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);//將文件寫入服務器
}
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;
}
}
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五、成功頁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" %>
上傳成功！上傳信息如下：
<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"> 繼續上傳</html:link></h2>
六、測試
從本站下載整個目錄結構TestStruts並放入tomcat的webapps目錄下，在瀏覽器中輸入：
http://127.0.0.1:8080/TestStruts/upload/upload.do