在struts中的Action方法中，调用request.getInputStream() 发现无法读到任何数据

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近有个项目下需要接收POST过来的XML数据包，在struts中的Action方法中，调用request.getInputStream() 发现无法读到任何数据。以下是POST数据的程序代码: Java代码
    URL url = new URL(urlBuf);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url
                    .openConnection();
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            httpURLConnection.setRequestMethod("POST");         httpURLConnection.setConnectTimeout(5000);
            httpURLConnection.setReadTimeout(5000);
            httpURLConnection.connect();
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
                    httpURLConnection.getOutputStream(), "GBK"));
            out.write(word);
            out.flush();
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    URL url = new URL(urlBuf);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url
                    .openConnection();
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            httpURLConnection.setRequestMethod("POST");         httpURLConnection.setConnectTimeout(5000);
            httpURLConnection.setReadTimeout(5000);
            httpURLConnection.connect();
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
                    httpURLConnection.getOutputStream(), "GBK"));
            out.write(word);
            out.flush();

    URL url = new URL(urlBuf);
      HttpURLConnection httpURLConnection = (HttpURLConnection) url
        .openConnection();
      httpURLConnection.setDoOutput(true);
      httpURLConnection.setDoInput(true);
      httpURLConnection.setRequestMethod("POST");   httpURLConnection.setConnectTimeout(5000);
      httpURLConnection.setReadTimeout(5000);
      httpURLConnection.connect();
      BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
        httpURLConnection.getOutputStream(), "GBK"));
      out.write(word);
      out.flush();这个是读取程序代码: Java代码
    BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));
            String line = null;
            StringBuilder sb = new StringBuilder();
            while((line = br.readLine())!=null){
                sb.append(line);
            }
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    BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));
            String line = null;
            StringBuilder sb = new StringBuilder();
            while((line = br.readLine())!=null){
                sb.append(line);
            }

    BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));
      String line = null;
      StringBuilder sb = new StringBuilder();
      while((line = br.readLine())!=null){
       sb.append(line);
      }开始还以为是犯了什么低级错误，不断调试查找原因，无果。baidu上搜索了下，众说纷纭，也没有很好的解决方案。我也左思右想，文件上传也是在Action里面处理的，组件肯定用到inputStream一点问题没有，没可能这里不行，后来灵光一闪，在POST程序中加入: Java代码
    httpURLConnection.setRequestProperty("content-type", "text/html");测试成功！根据以上现象，我们不难看出struts对没有指定content-type的request请求，封装时候作了一些处理，导致无法在Action中获取request.getInputStream() 和 request.getReader()。