Question

我尝试下载xml文件以从服务器解析，但服务器不发送HTTP标头，只发送xml文本。我已经尝试了几乎所有使用我可以找到的URL下载文件的方法，但是一切都给了我一个I / O异常。我可以将文件加载到WebView中，但我无法自己下载文件。

如何打开连接并下载没有HTTP标头的xml文件？

编辑：仍然给我一个I / O异常，这是我使用的代码：

    private class UpdateTask extends AsyncTask<Void, Void, Void> {
    protected Void doInBackground(Void...voids ) {
        String url = "http://192.168.1.92/state.xml";
        try{
            //get XML Pull parser
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            factory.setNamespaceAware(true);
            //factory.setValidating(false);
            XmlPullParser xpp = factory.newPullParser();        

            HttpGet httpGet = new HttpGet(url);
            DefaultHttpClient client = new DefaultHttpClient();
            HttpResponse response = client.execute(httpGet);

            if(response == null) return null;

            HttpEntity httpEntity = response.getEntity();
            InputStream inStream  = null;
            StringBuilder sb      = null;
            if (httpEntity == null) return null;

            try {
                inStream = httpEntity.getContent();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inStream, "UTF-8"));
                sb = new StringBuilder();
                String line = null;

                while((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }

                inStream.close();
                } catch (Exception ex) {
                }
                String xmlString = sb.toString();

                xpp.setInput(new StringReader(xmlString));
                int eventType = xpp.getEventType();

                String name = null;
                String text = null;
                while (eventType != XmlPullParser.END_DOCUMENT) {
                    if(eventType == XmlPullParser.START_TAG) { // <name>
                        name = xpp.getName();
                        System.out.println("got name: " + name);
                    } else if(eventType == XmlPullParser.END_TAG) {// </name> (xpp.getName();
                    } else if(eventType == XmlPullParser.TEXT) { // <>text</>
                        text = xpp.getText();
                        System.out.println("got text: " + text);

                    }
                    eventType = xpp.next();
                }
                finished = true;
            }catch(MalformedURLException e){
                System.out.println("Malformed URL");
            }catch(IOException e){
                System.out.println("IO Exception updating " + name + " at address: " + address);
            }catch(XmlPullParserException e){
                System.out.println("XML Pull Parser Error updating " + name + " at address: " + address);
            }catch(Exception e){
            }
        return null;
    }
}

每次给我一个I / O例外。但是，如果我将它指向提供HTTP标头的服务器，它下载就好了。服务器是我们在内部制作的设备，当您请求state.xml文件时，旧设备不提供HTTP标头，因此我需要能够同时使用这两种设备。

Answer 1

查看文档如何正确配置连接，简要介绍一下这样的内容：

HttpGet httpGet = new HttpGet(mServerUrl);
DefaultHttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpGet);

if(response == null) return;

HttpEntity httpEntity = response.getEntity();
InputStream inStream  = null;
StringBuilder sb      = null;
if (httpEntity == null) return;

try {
    inStream = httpEntity.getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(inStream, "UTF-8"));
    sb = new StringBuilder();
String line = null;

while((line = reader.readLine()) != null) {
    sb.append(line + "\n");
}

inStream.close();
} catch (Exception ex) {
}
String xmlString = sb.toString();

Answer 2

我必须打开自己的套接字，创建HTTP Get请求，然后删除有标题的服务器的HTTP标头。

        public String getData(){
        String returnData = "";
        String requestmsg = "GET /state.xml HTTP/1.0\r\n";
        requestmsg += "Connection: close\r\n";
        if(cpPassword != null)
            requestmsg += "Authorization: Basic " + Base64.encodeBytes(("admin:" + cpPassword).getBytes()) + "\r\n";
        requestmsg += "\r\n";

        int intPort = 80;
        DataOutputStream dos = null;
        BufferedReader dis = null;
        Socket socket = null;
        try {
            socket = new Socket(address, intPort);
            String data = "";
            socket.setSoTimeout(3000); //timeout after 2 seconds
            dos = new DataOutputStream(socket.getOutputStream());
            dis = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            dos.write(requestmsg.getBytes());

            StringBuilder sb = new StringBuilder();

            while ((data = dis.readLine()) != null) {
                sb.append(data);
            }
            returnData = sb.toString();
            if(returnData.length() == 0)
                return "";
            int xmlIndex = returnData.indexOf( "<?xml" );
            returnData = returnData.substring(xmlIndex);
            return returnData;
        } catch (IOException e) {
            Log.e("ClientActivity", "C: Error Getting Data From Socket", e);
            returnData = "";
        }finally{
            try{
                if(socket!=null)
                    socket.close();
            }catch(IOException e){
                Log.e("ClientActivity", "C: Error Closing Socket", e);
            }
        }
        return returnData;
    }

如何从没有http标头的服务器下载xml文件

2 个答案: