List items = upload.parseRequest(request),items为空
jsp的form里面这样写的：
<html:form method="post" action="/t04_report/t04_report_list.do" enctype="multipart/form-data">
Action里面这样写的：
private ActionForward performImportReports(ActionMapping actionMapping,
ActionForm actionForm, HttpServletRequest request,
HttpServletResponse response) {
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存缓冲区，超过后写入临时文件
factory.setSizeThreshold(10240000);
// 设置临时文件存储位置
String base = this.getServletContext().getRealPath("/")+"files";
System.out.println("--------base----------------->"+base);
File file = new File(base);
System.out.println("------------>"+file.exists());
if(!file.exists()){
file.mkdirs();
}
factory.setRepository(file);
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置单个文件的最大上传值
upload.setFileSizeMax(10002400000l);
// 设置整个request的最大值
upload.setSizeMax(10002400000l);
upload.setHeaderEncoding("gb2312");
try {
List<?> items = upload.parseRequest(request);
System.out.println("itemsSize--------------->"+items.size());//值为0，纠结啊。。。
FileItem item = null;
String fileName = null;
for (int i = 0 ;i < items.size(); i++){
item = (FileItem) items.get(i);
fileName = base + File.separator + item.getName();
System.out.println("------------------>"+item.getFieldName());
// 保存文件
System.out.println("--------fileName-------->"+fileName);

if (!item.isFormField() && item.getName().length() > 0) {
item.write(new File(fileName));
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

List items = upload.parseRequest(request),items为空，不知道怎么办了，求大哥们帮忙解决啊！
------解决方案--------------------

在status2 的配置文件里加上
<bean type= "org.apache.struts2.dispatcher.multipart.MultiPartRequest"
name= "myRequestParser" class= "com.icf.common.base.actions.RequestParseWrapper"
scope= "default" optional= "true " />
<constant name= "struts.multipart.handler" value= "myRequestParser" />
class
public class RequestParseWrapper extends JakartaMultiPartRequest {

publicvoid parse(HttpServletRequest servletRequest, String saveDir)throws IOException{
}
}
这样就可以得到request里的item
[解决办法]
同样错误，纠结中~
[解决办法]
enctype="multipart/form-data"去掉就可以了
[解决办法]

public void uploadFile(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=GBK");
    request.setCharacterEncoding("GBK");
    HttpSession session=request.getSession();
    session.setAttribute("progressBar",0);      //定义指定上传进度的Session变量
    String error = "";
    int maxSize=50*1024*1024;        //单个上传文件大小的上限
    DiskFileItemFactory factory = new DiskFileItemFactory();        //基于磁盘文件项目创建一个工厂对象
    ServletFileUpload upload = new ServletFileUpload(factory);  //创建一个新的文件上传对象
    try {
        List items = upload.parseRequest(request);// 解析上传请求
        Iterator itr = items.iterator();// 枚举方法
        while (itr.hasNext()) {
            FileItem item = (FileItem) itr.next();  //获取FileItem对象
            if (!item.isFormField()) {// 判断是否为文件域
                if (item.getName() != null && !item.getName().equals("")) {// 判断是否选择了文件 
 
                    long upFileSize=item.getSize();     //上传文件的大小
                    String fileName=item.getName();     //获取文件名
                    //System.out.println("上传文件的大小:" + item.getSize());
                    if(upFileSize>maxSize){
                        error="您上传的文件太大，请选择不超过50M的文件";
                        break;
                    }
                    // 此时文件暂存在服务器的内存中
                    File tempFile = new File(fileName);// 构造临时对象
                    String uploadPath = this.getServletContext().getRealPath("/upload");
                    File file = new File(uploadPath,tempFile.getName());   // 获取根目录对应的真实物理路径
                    InputStream is=item.getInputStream();
                    int buffer=1024;     //定义缓冲区的大小
                    int length=0;
                    byte[] b=new byte[buffer];
                    double percent=0;
                    FileOutputStream fos=new FileOutputStream(file);
                    while((length=is.read(b))!=-1){ 
 
                        percent+=length/(double)upFileSize*100D;        //计算上传文件的百分比
                         fos.write(b,0,length);      //向文件输出流写读取的数据
                        session.setAttribute("progressBar",Math.round(percent));    //将上传百分比保存到Session中
                    }
                    fos.close();
                        Thread.sleep(1000);     //线程休眠1秒
                } else {
                    error="没有选择上传文件！";
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        error = "上传文件出现错误：" + e.getMessage();
    }
    if (!"".equals(error)) {
        request.setAttribute("error", error);
        request.getRequestDispatcher("error.jsp").forward(request, response);
    }else {
        request.setAttribute("result", "文件上传成功！");
        request.getRequestDispatcher("upFile_deal.jsp").forward(request, response);
    }

看看这个例子吧
[解决办法]
一楼大侠的办法很好，解决了我纠结以旧的问题，在这里谢了