剛學(xué)Struts2，按照書上原模原樣的敲的代碼，本來可以上傳文件的，后來我加了手動(dòng)文件過濾功能，后來又注釋掉了，然后就不行了，報(bào)空指針異常！ 這是顯示的錯(cuò)誤這是Action里的代碼public?class?UploadAction?extends?ActionSupport?{ ????private?String?title;?//封裝上傳文件標(biāo)題的成員變量 ????private?File?upload;?//封裝上傳文件域的成員變量 ????private?String?uploadContentType;?/?/封裝上傳文件類型的成員變量 ????private?String?uploadFileName;//?封裝上傳文件名字的屬性 ????private?String?savePath; ????//?接受struts.xml?文件配值的方法 ????public?void?setSavePath(String?value)?{ ????????this.savePath?=?value; ????} ????//?獲取上傳文件的保存位置 ????private?String?getSavePath()?throws?Exception?{ ????????return?ServletActionContext.getServletContext().getRealPath(savePath); ????} ????public?String?getTitle()?{ ????????return?title; ????}/ ????public?void?setTitle(String?title)?{ ????????this.title?=?title; ????} ????public?File?getUpload()?{ ????????return?upload; ????} ????public?void?setUpload(File?upload)?{ ????????this.upload?=?upload; ????} ????public?String?getUploadContentType()?{ ????????return?uploadContentType; ????} ????public?void?setUploadContentType(String?uploadContentType)?{ ????????this.uploadContentType?=?uploadContentType; ????} ????public?String?getUploadFileName()?{ ????????return?uploadFileName; ????} ????public?void?setUploadFileName(String?uploadFileName)?{ ????????this.uploadFileName?=?uploadFileName; ????} ????@Override ????public?String?execute()?throws?Exception?{ ????????FileOutputStream?fos=new?FileOutputStream(getSavePath()+"\\"+getUploadFileName()); ????????FileInputStream?fis=new?FileInputStream(getUpload()); ????????byte[]?buffer=?new?byte[1024]; ????????int?len=0; ????????while((len=fis.read(buffer))>0){ ????????????fos.write(buffer,?0,?len); ????????} ????????return?SUCCESS; ????} }這是strusts.xml里的代碼<struts> ???<package?name="lee"?extends="struts-default"?> ?????<action?name="upload"?class="action.UploadAction"> ???????<param?name="savePath">/uploadFiles</param> ??????<!--?<param?name="allowTypes">image/png,image/bmp,image/gif,image/jpeg</param>?--> ???????<result>?/success.jsp</result> ???????<!--??<result?name="input">/upload.jsp</result>--> ?????</action> ???</package>謝謝各位了?。。?！在線等