struts2 fileupload乱码的问题

[爱吃青菜的猪]

jsp页面编码为utf-8,上传代码如下:
<s:form action="upload" theme="simple" enctype="multipart/form-data" method="post">

<table align="center" width="50%" border="1">

<tr>
<td>username</td>
<td>
<s:textfield name="username"></s:textfield>
</td>
</tr>

<tr>
<td>password</td>
<td>
<s:password name="password"></s:password>
</td>
</tr>

<tr>
<td>file</td>
<td id="more">
<s:file name="file"></s:file><input type="button" value="Add More..." onclick="addMore()">
</td>
</tr>

<tr>

<td>
<s:submit value="submit"></s:submit>
</td>
<td>
<s:reset value="reset"></s:reset>
</td>
</tr>

</table>


</s:form>


struts.xml配置文件如下:
<action name="upload" class="com.test.action.UploadAction">
<result name="success">/uploadResult.jsp</result>
<result name="input">/upload.jsp</result>
</action>

action文件execute代码如下:
for(int i=0; i < file.size() ; i++){
InputStream is = new FileInputStream(file.get(i));

String root = ServletActionContext.getRequest().getRealPath("/upload");

System.out.println(root);

File destFile = new File(root,this.getFileFileName().get(i));


OutputStream os = new FileOutputStream(destFile);

byte[] buffer = new byte[400];

int length = 0;

while((length = is.read()) > 0){
os.write(buffer,0,length);
}

is.close();

os.close();

}




return SUCCESS;
}
上传后的文件为乱码,请高手指点一下?

[老紫竹]

while((length = is.read()) > 0){ 
  os.write(buffer,0,length); 
} 

这段程序我看不懂哦！哈哈哈！

应该是这个样子吧！

while((length = is.read(buffer)) > 0){ 
  os.write(buffer,0,length); 
} 

[老紫竹]

还有，返回值不是>0 而是应该为 -1 代表结束

while((length = is.read(buffer)) !=-1){ 
  os.write(buffer,0,length); 
}