重写struts2文件上传处理类
1.struts文件配置

<!--文件大小限制--><constant name="struts.multipart.maxSize" value="1073741824" /><!--文件上传临时目录--><constant name="struts.multipart.saveDir" value="tmp"></constant><!--处理类声明--><bean    type="org.apache.struts2.dispatcher.multipart.MultiPartRequest"    name="perfmpr"    /><!--处理类定义--><constant name="struts.multipart.handler" value="perfmpr" />

2.编写处理类 继承JakartaMultiPartRequest

public class PerfMultiPartRequest extends JakartaMultiPartRequest{    //重写parse方法    public void parse(HttpServletRequest servletRequest, String saveDir)            throws IOException    {       //.....       items = (List<FileItem>)upload.parseRequest(createRequestContext(servletRequest));       //.....    }}