struts2奇葩问题之 no result define

struts的配置如下：

<package name="default" extends="struts-default">

<action name="down" class="test.struts.Down">

<result name="down" type="stream">

<param name="contentType">application/octet-stream</param>

<param name="inputName">bis</param>

<param name="contentDisposition">attachment;filename="${downloadFileName}"</param>

<param name="bufferSize">100000</param>

</result>

</action>

</package>

public InputStream bis;

public String downloadFileName;

//下面是getter and setter方法省略了

public String download() {

try{

File file=new File("C:\\12.doc");

FileInputStream fis = null;

try {

fis = new FileInputStream(file);

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

bis=new BufferedInputStream(fis);

downloadFileName="12.doc";

System.out.println();

}catch(Exception e){

e.printStackTrace();

}

return "down";

运行时会报

No result defined for action test.struts.Down and result down

这个错误，，找了半天是action的name属性的原因，，改成其他的就好了，，不过不知道为什么