struts2无法上传文件。无效的字段值

Question

当我尝试在struts2中上传文件时，我在我的视图中看到验证错误：字段“upload”的字段值无效。 而在JBoss的控制台，我得到：

10:37:56,140 WARN [OgnlValueStack] Error setting expression 'upload' with value '[Ljava.lang.String;@17c7b19' 
ognl.MethodFailedException: Method "setUpload" failed for object bm.action.content.SaveNewBannerAction@13ebb53 [java.lang.NoSuchMethodException: bm.action.content.SaveNewBannerAction.setUpload([Ljava.lang.String;)] 
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1289) 
    at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1478) 
    at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85) 
    at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) 
... 
... 
Caused by: java.lang.NoSuchMethodException: bm.action.content.SaveNewBannerAction.setUpload([Ljava.lang.String;) 
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1230) 

/-- Encapsulated exception ------------\ 
java.lang.NoSuchMethodException: bm.action.content.SaveNewBannerAction.setUpload([Ljava.lang.String;) 
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1230) 
    at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1478) 
    at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85) 
    at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) 

我的jsp：

<div class="v4DDfiltering"> 
    <s:fielderror/> 
    <s:form id="saveNewBannerForm" name="saveNewBannerForm" 
     action="SaveNewBannerAction" theme="simple" method="POST" enctype="multipart/form-data"> 
... 
     <div class="OneFilteringRow"> 
      <s:label for="upload" value="Plik:*" /> 
      <s:file id="upload" name="upload"/> 
     </div> 
... 
     <div class="OneFilteringRow"> 
      <s:url id="saveNewBannerUrl" action="SaveNewBannerAction" /> 

      <sj:a href="%{saveNewBannerUrl}" targets="messagesDiv" 
       formIds="saveNewBannerForm"> 
       Save 
      </sj:a> 

     </div> 
    </s:form> 
</div> 

我的动作类SaveNewBannerAction.java

public class SaveNewBannerAction extends BaseAction { 
    private static final long serialVersionUID = 1L; 

    private static final Log LOG = LogFactory.getLog(SaveNewBannerAction.class); 

    private boolean validate = true; 

    private File upload;// The actual file 
    private String uploadContentType; // The content type of the file 
    private String uploadFileName; // The uploaded file name 
    private String fileCaption;// The caption of the file entered by user 
     ... 

    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; 
    } 

    public String getFileCaption() { 
     return fileCaption; 
    } 

    public void setFileCaption(String fileCaption) { 
     this.fileCaption = fileCaption; 
    } 
    @Override 
    public void validate() { 
     LOG.info("Enter: validate()"); 

     LOG.info("VALIDATE FIELDS"); 
     ... 
     if(upload == null) { 
      addFieldError("upload", 
        "Proszę uzupełnić pole: plik."); 
      validate = false; 
     } else { 
      if(!uploadContentType.contains("image")) { 
       addFieldError("upload", 
         "Wprowadzono niepoprawny format pliku. Plik musi być obrazkiem."); 
       validate = false; 
      } 
     } 

     LOG.info("Exit: validate()"); 
    } 

我将是你的帮助表示感谢。

Answer 1

你的JSP应该是这样的：

<div class="v4DDfiltering"> 
    <s:fielderror/> 
    <s:form id="saveNewBannerForm" name="saveNewBannerForm" 
     action="SaveNewBannerAction" theme="simple" method="POST" enctype="multipart/form-data"> 
... 
     <div class="OneFilteringRow"> 
      <s:label for="upload" value="Plik:*" /> 
      <s:file id="upload" name="upload"/> 
     </div> 
... 
     <div class="OneFilteringRow"> 
      <sj:submit targets="messagesDiv"/> 
     </div> 
    </s:form> 
</div> 

OR：

<div class="v4DDfiltering"> 
    <s:fielderror/> 
    <s:form id="saveNewBannerForm" name="saveNewBannerForm" 
     action="SaveNewBannerAction" theme="simple" method="POST" enctype="multipart/form-data"> 
... 
     <div class="OneFilteringRow"> 
      <s:label for="upload" value="Plik:*" /> 
      <s:file id="upload" name="upload"/> 
     </div> 
... 
    </s:form> 
    <sj:a targets="messagesDiv" formIds="saveNewBannerForm">Save</sj:a> 
</div>