如何使用 HttpURLConnection 发布数据

Question

我从 API23 更改为 22，因为他们说 httpclient 不可用。当我切换到 API22 时，我遇到了 HttpClient、HttpPost 和 NameValuePair 的问题。我找到了使用 HttpURLConnectionHandler 的解决方案。但我不知道如何将其用于以下方法。

 public void send(View v)
{

    HttpClient httpclient = new DefaultHttpClient();
    // put the address to your server and receiver file here
    HttpPost httppost = new HttpPost("http://yoursite/yourPHPScript.php");
    try {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        // we wont be receiving the parameter ID in your server, but it is here to show you how you can send more data
        nameValuePairs.add(new BasicNameValuePair("id", "12345"));
        // message is the parameter we are receiving, it has the value of 1 which is the value that will be sent from your server to your Arduino board
        nameValuePairs.add(new BasicNameValuePair("message", "1"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        httpclient.execute(httppost); // send the parameter to the server
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
    } catch (IOException e) {
        // TODO Auto-generated catch block
    }
}

谁来帮帮我

Answer 1

你可以这样做：

public boolean sendPost(MessageSenderContent content) {

        HttpURLConnection connection;
        try {
            URL gcmAPI = new URL("your_url");
            connection = (HttpURLConnection) gcmAPI.openConnection();

            connection.setRequestMethod("POST");// type of request
            connection.setRequestProperty("Content-Type", "application/json");//some header you want to add
            connection.setRequestProperty("Authorization", "key=" + AppConfig.API_KEY);//some header you want to add
            connection.setDoOutput(true);

            ObjectMapper mapper = new ObjectMapper();
            mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
            DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
            //content is the object you want to send, use instead of NameValuesPair
            mapper.writeValue(dataOutputStream, content);

            dataOutputStream.flush();
            dataOutputStream.close();

            responseCode = connection.getResponseCode();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (responseCode == 200) {
            Log.i("Request Status", "This is success response status from server: " + responseCode);
            return true;
        } else {
            Log.i("Request Status", "This is failure response status from server: " + responseCode);
            return false;
        }
}

MessageSenderContent 的示例，您可以为“message”和“id”创建自己的示例：

public class MessageSenderContent implements Serializable {
    private List<String> registration_ids;
    private Map<String, String> data;

    public void addRegId(String regId){
        if (registration_ids==null){
            registration_ids = new LinkedList<>();
            registration_ids.add(regId);
        }
    }

    public void createData(String title,String message) {
        if (data == null)
            data = new HashMap<>();

        data.put("title", title);
        data.put("message", message);
    }

    public Map<String, String> getData() {
        return data;
    }

    public void setData(Map<String, String> data) {
        this.data = data;
    }

    public List<String> getRegIds() {
        return registration_ids;
    }

    public void setRegIds(List<String> regIds) {
        this.registration_ids = regIds;
    }

    @Override
    public String toString() {
        return "MessageSenderContent{" +
                "registration_ids=" + registration_ids +
                ", data=" + data +
                '}';
    }

更新：

你可以在你的 build.gradle 文件中导入之后使用 HttpUrlConnection

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"
    useLibrary 'org.apache.http.legacy' // this one will let you use HttpUrlConnection
    packagingOptions {
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
}
    ...
}