关于struts2.x下载的问题

Question

我用SSH2做了一个下载的工程,
service中的代码如下所示   public InputStream getInputSream() {
// TODO Auto-generated method stub
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("sheet1");
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("客户编号"); cell = row.createCell((short) 1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("客户编号"); cell = row.createCell((short) 2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("客户编号"); cell = row.createCell((short) 3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16); cell.setCellValue("客户编号"); List<Customer> list = dao.getCustomer(); for (int i = 0; i < list.size(); i++) { Customer customer = list.get(i);
row = sheet.createRow(i + 1); cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(customer.getId()); cell = row.createCell((short) 1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(customer.getUsername()); cell = row.createCell((short) 2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(customer.getSex()); cell = row.createCell((short) 3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(customer.getAge()); }
ByteArrayOutputStream os = new ByteArrayOutputStream(); try {
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
} byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content);
return is;
}
action层中的代码如下所示  @Override
public String execute() throws Exception {
// TODO Auto-generated method stub
return this.SUCCESS;
}

public InputStream getDownloadFile(){

return this.service.getInputSream();

}struts.xml中的代码如下所示    <action name="generateExcel" class="generateExcelAction">
  <result name="success" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="contentDisposition">filename="AllUsers.xls"</param>
 <param name="inputName">downloadFile</param>
</result>
</action>

Answer 1

但是报以下异常,请各位大侠指点一下严重: Servlet.service() for servlet default threw exception
java.lang.IllegalArgumentException: Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack. Check the <param name="inputName"> tag specified for this action.
at org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:189)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:348)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:123)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:167)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:105)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:83)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:207)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:74)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:127)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:107)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:206)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:115)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:143)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(

Answer 2

输入流 未找到。action代码没贴完。检查不出来。

Answer 3

看错了。尴尬，我有一个下载的例子，参考一下吧
public class DownLoadAction extends BaseAction{
private static final long serialVersionUID = 1L;
private String obj;
private int objId;
private int order;
private AbstractDao abstractDao;
public String getObj() {
return obj;
}
public void setObj(String obj) {
this.obj = obj;
}
public int getObjId() {
return objId;
}
public void setObjId(int objId) {
this.objId = objId;
}
public int getOrder() {
return order;
}
public void setOrder(int order) {
this.order = order;
}
public void setAbstractDao(AbstractDao abstractDao) {
this.abstractDao = abstractDao;
}
public InputStream getDownloadFile()throws Exception
{
   String realpath = getResult();
   return ServletActionContext.getServletContext().getResourceAsStream(realpath);
}

/**
 * @author mazhe 
 * @time 2009-11-20 下午04:23:52
 * @description
 * @return
 */
private String getResult(){
String hql = "from "+obj+" as o where o.id="+objId;
Object obj = abstractDao.findObject(hql);
String path ="";
if(obj instanceof Notice){
Notice o = (Notice)obj;
path = o.getUploadResource();
}
else {}
String[] files = path.split(";");
return files[order-1];
} 

private String getDelResult(){
String hql = "from "+obj+" as o where o.id="+objId;
Object obj = abstractDao.findObject(hql);
String path ="";
String result ="";
if(obj instanceof Notice){
Notice o = (Notice)obj;
path = o.getUploadResource();
String[] files = path.split(";");
result = files[order-1];
path = path.replaceAll(result+";", "");
o.setUploadResource(path);
abstractDao.update(o);
}
else {}
return result;
}
public String getDownloadFileName()throws Exception { 
   String path = getResult();
   String downFileName = path.substring(path.lastIndexOf("/")+1);
   try {
    downFileName = new String(downFileName.getBytes(), "iso-8859-1");
   } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
   }
   //System.out.println("!!!!!!!!!!!!!"+downFileName);
   return downFileName; 
}

public String down() throws Exception {
return SUCCESS;
}

public String del() throws Exception{
FileOperation.delFile(getRequest().getSession().getServletContext().getRealPath(getDelResult()));
return SUCCESS;
} <action name="down" class="downAction" method="down"> 
      <result name="success" type="stream"> 
          <param name="contentDisposition">attachment;filename="${downloadFileName}"</param>  
          <param name="inputName">downloadFile</param>
          <param name="bufferSize">4096</param> 
      </result> 
   </action>