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>      <!-- 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>

<script type="text/javascript">&lt;!-- google_ad_client = &quot;pub-1832179689702023&quot;; google_ad_width = 336; google_ad_height = 280; google_ad_format = &quot;336x280_as&quot;; google_ad_type = &quot;text_image&quot;; //2007-01-10: 336_280 google_ad_channel = &quot;7111701428&quot;; google_color_border = &quot;FFFFFF&quot;; google_color_bg = &quot;FFFFFF&quot;; google_color_link = &quot;0000FF&quot;; google_color_text = &quot;000000&quot;; google_color_url = &quot;3D81EE&quot;; //--&gt;</script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"> </script><script>google_protectAndRun(&quot;ads_core.google_render_ad&quot;, 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>


  <!-- 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配置和资源文件

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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>
  <!-- 这里设置上传文件的最大值。 -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>

  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>

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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;

    }

}


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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;
  }
}
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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