在struts 2中下载文件

我想从运行Struts2，Hibernate和Spring的web服务器上下载文件，但我总是得到这个异常。在struts 2中下载文件

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)

我检查了inputName参数并调试了项目，找出InputStream不为null。

这是下载类

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

，这是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>

是因为ByteArrayInputStream的或任何其他原因的除外。我有所有变量的公共getter和setter方法，并且我检查了它们都不是null。

EDITS：DownloadFile类

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; 
    } 

}

来源

2014-01-13 user123

显示你的'DownloadFile'行动。 –

@AleksandrM请参阅EDITS – user123

@ user3172529您的'inputName'参数不是'InputStream'类型。检查上下文中的值。 –

好吧，改变inputName到inputStream。像这样

private InputStream inputStream; 

public InputStream getInputStream() { 
    return inputStream; 
} 

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

的参数inputName默认设置为inputStream，那么，你可能会删除它。另请注意，结果中的参数名称将在值栈中查找。因此，如果您在操作中公开了像getInputName这样的获取方式，则意味着您要覆盖配置中的值。

来源

2014-01-14 18:56:09

你可以看看 http://stackoverflow.com/questions/21076569/jsp-value-of - 变化后改变模型弹出我不明白为什么价值改变后模式弹出即使他们在同一页 – user123

确保getInputName（）方法不返回null，如果它返回null，则会发生此异常。

这个异常的描述是误导性的，它会让你觉得你的inputName参数配置的名称是错误的。但是，实际的原因是getInputName（）的返回InputStream为null。

来源

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>

来源

2017-05-30 10:10:49

请解释你的答案有点？ – Ray

在struts 2中下载文件

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