struts2文件下载异常

异常信息：Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the <param name="inputName"> tag specified for this action.

struts.xml

<action name="download" class="upload.DownLoadAction">
     <param name="inputPath">\WEB-INF\uploadFile\Criteria.txt</param>
     <result name="success" type="stream"></result>
     <param name="contentType">text/txt</param>
     <param name="inputName">downloadFile</param>
     <param name="contentDisposition">attachment;filename="Criteria.txt"</param>
     <param name="bufferSize">4096</param>
</action>

 DownLoadAction.action

package upload;
import java.io.FileInputStream;
import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DownLoadAction extends ActionSupport{

    private String inputPath;
    
    
    public String getInputPath() {
        return inputPath;
    }


    public void setInputPath(String inputPath) {
        this.inputPath = inputPath;
    }

                //这个getDownloadFile()方法没进入
    public InputStream getDownloadFile()
    {
        System.out.println("inputPath"+inputPath);
        System.out.println(ServletActionContext.getServletContext().getResourceAsStream(inputPath));
         return ServletActionContext.getServletContext().getResourceAsStream(inputPath);
    }

    @Override
    public String execute() throws Exception {
        System.out.println("ss");
        return SUCCESS;
    }

    
}

 麻烦各位帮我看看，谢谢啦！

[b] 你的result配置错误。 param应该result中包裹着[/b]

[code="xml"]
text/txt

downloadFile

attachment;filename="Criteria.txt"

4096
[/code]

是否进入了getDownloadFile这个方法？

即以下2行输出是否正常？

[code="java"]System.out.println("inputPath"+inputPath);

System.out.println(ServletActionContext.getServletContext().getResourceAsStream(inputPath)); [/code]

将MIMETYPE改为如下形式：
[code="xml"] text/plain [/code]

参考下我的博客，希望对你有所启发：

[url]http://xiaolongfeixiang.iteye.com/blog/662479[/url]