struts2的文件上传和下载

struts2的文件上传和下载
文件上传部分:
上传页面 upload.jsp
        <s:form action ="upload" method ="POST" enctype ="multipart/form-data" >   
                <s:file name ="file" label ="上传文件"/>
                <s:submit />   
        </s:form >
上传 UploadAction.java
  private File file;
   
  private String fileFileName;
   
  private String fileContextType;
   
  private String root;
   
  private HttpServletRequest request;
  private Map session;
   
   @Override
  public String execute() throws Exception {
    
     session.put("fileFileName", fileFileName);
    
    //取文件后缀名
     String lastname=null;
    int i = fileFileName.lastIndexOf('.');
     lastname=fileFileName.substring(i+1);       
                   
    //取当前日期
     SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
     Calendar calendar = Calendar.getInstance();
     String date=sdf.format(calendar.getTime());
    
    //10亿的随机数
     java.util.Random r=new java.util.Random();   
     String radom=String.valueOf(r.nextInt(1000000000));
    
     fileFileName=date+radom+"."+lastname;
    
     session.put("fname", fileFileName);
    
     InputStream is=new FileInputStream(file);
    
     root= ServletActionContext.getRequest().getRealPath("/upload") ;//存储到apache项目发布目录上
//     String root="D:\\a1/upload";//存储到项目文件夹里
    
     session.put("fpath", root);
     File copyFile=new File(root,fileFileName);
    
     OutputStream os=new FileOutputStream(copyFile);
    
    byte[] buffer=new byte[400];
    
    int length=0;
    
    while(     (length=is.read(buffer))     >     0     ){
       os.write(buffer, 0, length);
     }
    
     is.close();
    
     os.close();
    
    return SUCCESS;
   }
struts.xml配置
     <action name="upload"
       class="com.enorth.mpup.action.UploadAction">
      <result name="success">uploadshow.jsp</result>
      <result name="input">index.jsp</result>
    </action>
文件下载部分:
下载页面 uploadshow.jsp
    <a    href="download.action"     target="_blank">
          <%=session.getAttribute("fileFileName") %>
    </a>
下载 FileDownAction.java
  private String fileName;// 初始的通过param指定的文件名属性

  private String inputPath;// 指定要被下载的文件路径

  private HttpServletRequest request;
   
  private Map session;
   
   
  public InputStream getInputStream() throws Exception {

    // 通过 ServletContext，也就是application 来读取数据

     inputPath="/upload/"+(String)session.get("fname");
    
    return ServletActionContext.getServletContext().getResourceAsStream(inputPath);
    
   }

  public String execute() throws Exception {
    
    return SUCCESS;   
    
   }

  /** 提供转换编码后的供下载用的文件名 */

  public String getDownloadFileName() {

     fileName=(String) session.get("fname");
    
     System.out.println(fileName);
    
     String downFileName = fileName;

    try {

       downFileName = new String(downFileName.getBytes(), "ISO8859-1");

     } catch (UnsupportedEncodingException e) {

       e.printStackTrace();

     }

    return downFileName;

   }
struts.xml配置
     <!-- 下载现有文件 -->
    <action name="download" class="com.enorth.mpup.action.FileDownAction">
     <!--     <param name="inputPath">/download/aaa.txt</param> -->   
       <!-- 初始文件名   
       <param name="fileName">aaa.txt</param>-->
      <result name="success" type="stream">
        <param name="contentType">
           application/octet-stream;charset=ISO8859-1
        </param>
        <param name="inputName">inputStream</param>
         <!-- 使用经过转码的文件名作为下载文件名，downloadFileName属性   
           对应action类中的方法 getDownloadFileName() -->
        <param name="contentDisposition">
           attachment;filename="${downloadFileName}"
        </param>
        <param name="bufferSize">4096</param>
      </result>
    </action>
以上均为部分核心文件.


Unable to load bean org.apache.struts2.dispatcher.multipart.MultiPartRequest (jakarta) - [unknown location]

java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream

这两个错误的原因是缺少jar包.
commons-fileupload-1.2.1.jar
commons-io-1.4.jar


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