java - Android 开发中如何在没有 BasicNameValuePair 的情况下将数据发送到 PHP 脚本

Question

我正在使用一些在线教程学习 Android。除了这个之外，我所有的 Java 类(class)都很好。

@Override
        protected Void doInBackground(Void... params) {
            ArrayList<NameValuePair> dataToSend = new ArrayList<>();
            dataToSend.add(new BasicNameValuePair("email", user.userEmail));
            dataToSend.add(new BasicNameValuePair("fname", user.firstName));
            dataToSend.add(new BasicNameValuePair("lname", user.lastName));
            dataToSend.add(new BasicNameValuePair("password", user.password));

            HttpParams httpRequestParams = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT);
            HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT);

            HttpClient client = new DefaultHttpClient(httpRequestParams);
            HttpPost post = new HttpPost(SERVER_ADDRESS + "register.php");

            try{
                post.setEntity(new UrlEncodedFormaEntity(dataToSend));
                client.execute(post);
            }catch (Exception e){
                e.printStackTrace();

            }
            return null;
        }

这是所有导入

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;

import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONObject;

import java.util.ArrayList;

Screenshot of the error parts

我已经搜索了与此相关的其他问题，但我真的想要专门针对我的情况的答案。请指教。

Answer 1

创建一个新类。即 RestClient.java

public class RestClient {


    private static String SERVICE_URL;

    private ArrayList<NameValuePair> params;
    private ArrayList <NameValuePair> headers;

    private int responseCode;
    private String message;

    private String response;

    public String getResponse() {
        return response;
    }

    public String getErrorMessage() {
        return message;
    }

    public int getResponseCode() {
        return responseCode;
    }

    public RestClient(String serviceMethod)
    {
        SERVICE_URL = serviceMethod;
        //this.serviceMethod = serviceMethod;
        params = new ArrayList<NameValuePair>();
        headers = new ArrayList<NameValuePair>();
    }

    public void AddParam(String name, String value)
    {
        params.add(new BasicNameValuePair(name, value));
    }

    public void AddHeader(String name, String value)
    {
        headers.add(new BasicNameValuePair(name, value));
    }

    public String Execute(RequestMethod method) throws Exception
    {
        switch(method) {
            case GET:
            {
                //add parameters
                String combinedParams = "";
                if(!params.isEmpty()){
                    combinedParams += "?";
                    for(NameValuePair p : params)
                    {
                        String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
                        if(combinedParams.length() > 1)
                        {
                            combinedParams  +=  "&" + paramString;
                        }
                        else
                        {
                            combinedParams += paramString;
                        }
                    }
                }

                //SERVICE_URL +=serviceMethod;
                HttpGet request = new HttpGet(SERVICE_URL + combinedParams);

                //add headers
                for(NameValuePair h : headers)
                {
                    request.addHeader(h.getName(), h.getValue());
                }

                executeRequest(request, SERVICE_URL);
                break;
            }
            case POST:
            {
                //SERVICE_URL +=serviceMethod;
                HttpPost request = new HttpPost(SERVICE_URL);

                //add headers
                for(NameValuePair h : headers)
                {
                    request.addHeader(h.getName(), h.getValue());
                }

                if(!params.isEmpty()){
                    request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                }

                executeRequest(request, SERVICE_URL);
                break;
            }
        }
        return response;
    }

    private String executeRequest(HttpUriRequest request, String url)
    {
        HttpClient client = new DefaultHttpClient();

        HttpResponse httpResponse;

        try {
            httpResponse = client.execute(request);
            responseCode = httpResponse.getStatusLine().getStatusCode();
            message = httpResponse.getStatusLine().getReasonPhrase();

            HttpEntity entity = httpResponse.getEntity();

            if (entity != null) {

                InputStream instream = entity.getContent();
                response = convertStreamToString(instream);

                // Closing the input stream will trigger connection release
                instream.close();
            }
            SERVICE_URL+=SERVICE_URL;
        } catch (ClientProtocolException e)  {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        } catch (IOException e) {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        }

        return response;
    }

    private static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }}

现在在 AsyncTask 中你可以调用你的 Web 服务，可以是 Post、Get 等。你还可以轻松添加 Header

示例:

@Override
    protected Void doInBackground(Void... voids) {

        try {

            RestClient client = new RestClient("your url goes here");
            client.AddParam("param1", "value1"));
            client.AddParam("param2", "value2"));
            client.AddHeader("Headername","Value");
            client.Execute(RequestMethod.POST);
            response = client.getResponse();

        }catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

对于 GET 方法，只需将“client.Execute(RequestMethod.POST)”替换为“client.Execute(RequestMethod.GET)”