structs文件下传，空指针有关问题
日期：2014-05-17 浏览次数：20852 次
structs文件上传，空指针问题
jsp代码
<body>
<form action="/test/upload.do?action=uploadFile" method="POST" enctype="multipart/form-data" name="form1">
图片 <input type="file" name="uploadcover">
描述 <input type="text" name="title" size="20">
<input type="submit" value="上传">
</form>
</body>
action代码：
public ActionForward uploadFile(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse reponse)throws Exception{
initAction(request, mapping);
UploadForm uploadForm=(UploadForm)form;
if(uploadForm!=null){
String title=uploadForm.getTitle();
System.out.println(title);
FormFile file=uploadForm.getUploadcover();
if(file!=null){
String fileName=file.getFileName();
if(!(file==null||"".equals(file.getFileName()))){
String path="d:\\test\\"+fileName+".jpg";
path=path.replaceAll("\\\\","/");
String pathName=null;
if(path.endsWith("/") ){
pathName=path;
pathName+=fileName;
}else{
pathName=path.substring(0,path.indexOf("/"));
}
File dir=new File(pathName);
if(!dir.isDirectory()){
dir.mkdirs();
try{
InputStream stream=file.getInputStream();
byte buffer[]=new byte[8192];
int bytesRead=0;
FileOutputStream fos=new FileOutputStream(path);
while((bytesRead=stream.read(buffer,0,8192))!=-1){
fos.write(buffer,0,bytesRead);
}
fos.flush();
fos.close();
}catch(IOException e){
e.printStackTrace();
return findForward("error");
}
return findForward("success");
}
}
}
}
return findForward("error");
}
actionfor代码：
public class UploadForm extends ActionForm {
private FormFile uploadcover;
private String title;
public FormFile getUploadcover() {
return uploadcover;
}
public void setUploadcover(FormFile Uploadcover) {
this.uploadcover = Uploadcover;
}
public String getTitle(){
return this.title;
}
public void setTitle(String title){
this.title=title;
}
}
FormFile file=uploadForm.getUploadcover();此处file为空？为什么？title中有内容，uploadcover为空？
------解决方案--------------------
你这是struts 1.x。
1、UploadForm 是如何写的，如何定义uploadcover这个属性的。（
jsp代码
<body>
<form action="/test/upload.do?action=uploadFile" method="POST" enctype="multipart/form-data" name="form1">
图片 <input type="file" name="uploadcover">
描述 <input type="text" name="title" size="20">
<input type="submit" value="上传">
</form>
</body>
action代码：
public ActionForward uploadFile(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse reponse)throws Exception{
initAction(request, mapping);
UploadForm uploadForm=(UploadForm)form;
if(uploadForm!=null){
String title=uploadForm.getTitle();
System.out.println(title);
FormFile file=uploadForm.getUploadcover();
if(file!=null){
String fileName=file.getFileName();
if(!(file==null||"".equals(file.getFileName()))){
String path="d:\\test\\"+fileName+".jpg";
path=path.replaceAll("\\\\","/");
String pathName=null;
if(path.endsWith("/") ){
pathName=path;
pathName+=fileName;
}else{
pathName=path.substring(0,path.indexOf("/"));
}
File dir=new File(pathName);
if(!dir.isDirectory()){
dir.mkdirs();
try{
InputStream stream=file.getInputStream();
byte buffer[]=new byte[8192];
int bytesRead=0;
FileOutputStream fos=new FileOutputStream(path);
while((bytesRead=stream.read(buffer,0,8192))!=-1){
fos.write(buffer,0,bytesRead);
}
fos.flush();
fos.close();
}catch(IOException e){
e.printStackTrace();
return findForward("error");
}
return findForward("success");
}
}
}
}
return findForward("error");
}
actionfor代码：
public class UploadForm extends ActionForm {
private FormFile uploadcover;
private String title;
public FormFile getUploadcover() {
return uploadcover;
}
public void setUploadcover(FormFile Uploadcover) {
this.uploadcover = Uploadcover;
}
public String getTitle(){
return this.title;
}
public void setTitle(String title){
this.title=title;
}
}
FormFile file=uploadForm.getUploadcover();此处file为空？为什么？title中有内容，uploadcover为空？
------解决方案--------------------
你这是struts 1.x。
1、UploadForm 是如何写的，如何定义uploadcover这个属性的。（
免责声明： 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。
