在struts 2中下載文件

我想從運行Struts2，Hibernate和Spring的web服務器上下載文件，但我總是得到這個異常。在struts 2中下載文件

java.lang.IllegalArgumentException: Can not find a java.io.InputStream with the name [inputName] in the invocation stack. Check the <param name="inputName"> tag specified for this action. 
    org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:237) 
    org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) 
    com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275) 
    org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) 
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    com.riteshsangwan.ossoc.core.interceptors.AuthenticationInterceptor.intercept(AuthenticationInterceptor.java:34) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) 
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) 
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562) 
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

我檢查了inputName參數並調試了項目，找出InputStream不爲null。

這是下載類

inputName= new ByteArrayInputStream(mf.getFileContent());

，這是Struts 2的映射

 <action name="downloadfile" class="com.riteshsangwan.ossoc.core.actions.DownloadFile"> 
      <result name="success" type="stream"> 

       <param name="inputName">inputName</param> 
       <param name="contentDisposition">attachment;filename=${fileName}</param> 
       <param name="contentType">${contentType}</param> 
       <param name="bufferSize">1024</param> 
       <param name="contentLength">${contentLength}</param> 
       <param name="allowCaching">false</param> 

      </result> 
      <result name="input">/user/files.jsp</result> 
     </action>

是因爲ByteArrayInputStream的或任何其他原因的除外。我有所有變量的公共getter和setter方法，並且我檢查了它們都不是null。

EDITS：DownloadFile類

package com.riteshsangwan.ossoc.core.actions; 

import com.opensymphony.xwork2.ActionContext; 
import com.opensymphony.xwork2.ActionSupport; 
import com.riteshsangwan.ossoc.core.dao.FilesBo; 
import com.riteshsangwan.ossoc.core.entities.Files; 
import com.riteshsangwan.ossoc.core.entities.Users; 
import com.riteshsangwan.ossoc.core.util.MyFile; 
import com.riteshsangwan.ossoc.core.util.Operations; 
import java.io.ByteArrayInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.List; 
import java.util.Map; 
import javax.servlet.ServletContext; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.web.context.ServletContextAware; 


public class DownloadFile extends ActionSupport implements ServletContextAware{ 

    private long fid; 
    private String contentType; 
    private long contentLength; 
    private String fileName; 
    private InputStream inputName; 


    private ServletContext context; 
    private String downloadStatus; 
    private String downloadpassword; 
    private List fileList; 
    private Map<String,Object> session; 

    public String getFileName() { 
     return fileName; 
    } 

    public void setFileName(String fileName) { 
     this.fileName = fileName; 
    } 


    public List getFileList() { 
     return fileList; 
    } 

    public void setFileList(List fileList) { 
     this.fileList = fileList; 
    } 


    public String getDownloadStatus() { 
     return downloadStatus; 
    } 

    public void setDownloadStatus(String downloadStatus) { 
     this.downloadStatus = downloadStatus; 
    } 

    public String getDownloadpassword() { 
     return downloadpassword; 
    } 

    public void setDownloadpassword(String downloadpassword) { 
     this.downloadpassword = downloadpassword; 
    } 

    public String getStatus() { 
     return downloadStatus; 
    } 

    public void setStatus(String downloadStatus) { 
     this.downloadStatus = downloadStatus; 
    } 

    @Autowired 
    private FilesBo fbo; 

    @Autowired 
    private Operations operation; 

    public Operations getOperation() { 
     return operation; 
    } 

    public void setOperation(Operations operation) { 
     this.operation = operation; 
    } 

    public FilesBo getFbo() { 
     return fbo; 
    } 

    public void setFbo(FilesBo fbo) { 
     this.fbo = fbo; 
    } 


    public long getFid() { 
     return fid; 
    } 

    public void setFid(long fid) { 
     this.fid = fid; 
    } 

    public String getContentType() { 
     return contentType; 
    } 

    public void setContentType(String contentType) { 
     this.contentType = contentType; 
    } 

    public long getContentLength() { 
     return contentLength; 
    } 

    public void setContentLength(long contentLength) { 
     this.contentLength = contentLength; 
    } 


    public InputStream getInputName() { 
     return inputName; 
    } 

    public void setInputName(InputStream inputName) { 
     this.inputName = inputName; 
    } 


    @Override 
    public String execute(){ 
     String response; 
     int a=10; 
     try 
     { 
      session=ActionContext.getContext().getSession(); 
      Users u= (Users) session.get("user"); 
      long uid=u.getUid(); 
      fileList=fbo.getAllFiles(uid); 
      Files f=getFbo().getFileWithData(getFid()); 
      MyFile mf=new MyFile(); 
      mf.setFileContent(f.getFileData()); 
      mf.setFileContentType(f.getFileContentType()); 
      mf.setFileHash(f.getFileHash()); 
      mf.setFileName(f.getFileName()); 
      mf.setFileSize(f.getFileSize()); 
      mf.setPassword(downloadpassword); 
      mf=operation.decrypt(mf); 

      fileName=mf.getFileName(); 
      contentLength=mf.getFileSize(); 
      contentType=mf.getFileContentType(); 

      inputName=new ByteArrayInputStream(mf.getFileContent()); 

      response=ActionSupport.SUCCESS; 
     } 
     catch(IOException e) 
     { 
      if(e.getMessage().equalsIgnoreCase("Message has been altered or password incorrect")) 
      { 
       downloadStatus="Message has been altered or incorrect password. Try again."; 
      } 
      response=ActionSupport.INPUT; 
     } 
     catch(Exception e) 
     { 
      downloadStatus="Some error occured. Try Again"; 
      response=ActionSupport.INPUT; 
     } 
     return response; 
    } 

    @Override 
    public void setServletContext(ServletContext servletContext) { 
     this.context=servletContext; 
    } 

}

來源

2014-01-13 user123

顯示你的'DownloadFile'行動。 –

@AleksandrM請參閱EDITS – user123

@ user3172529您的'inputName'參數不是'InputStream'類型。檢查上下文中的值。 –

好吧，改變inputName到inputStream。像這樣

private InputStream inputStream; 

public InputStream getInputStream() { 
    return inputStream; 
} 

public void setInputStream(InputStream inputStream) { 
    this.inputStream= inputStream; 
}

的參數inputName默認設置爲inputStream，那麼，你可能會刪除它。另請注意，結果中的參數名稱將在值棧中查找。因此，如果您在操作中公開了像getInputName這樣的獲取方式，則意味着您要覆蓋配置中的值。

來源

2014-01-14 18:56:09

你可以看看 http://stackoverflow.com/questions/21076569/jsp-value-of - 變化後改變模型彈出我不明白爲什麼價值改變後模式彈出即使他們在同一頁 – user123

確保getInputName（）方法不返回null，如果它返回null，則會發生此異常。

這個異常的描述是誤導性的，它會讓你覺得你的inputName參數配置的名稱是錯誤的。但是，實際的原因是getInputName（）的返回InputStream爲null。

來源

2015-05-11 03:04:16 rgc

  <param name="inputName">inputName</param> 
      <param name="contentDisposition">attachment;filename=${fileName}</param> 
      <param name="contentType">${contentType}</param> 
      <param name="bufferSize">1024</param> 
      <param name="contentLength">${contentLength}</param> 
      <param name="allowCaching">false</param> 


      *<!--add a iuputStream--> 
      <param name="inputStream">inputName</param>* 

     </result> 
     <result name="input">/user/files.jsp</result> 
    </action>

來源

2017-05-30 10:10:49

請解釋你的答案有點？ – Ray

在struts 2中下載文件

回答

相關問題