android http json 2（三个部分）

步骤一：定义回调接口

package com.qtechnix.QuarkHq;

public interface AsyncResponse {
    void onDataReceivedSuccess(String jsonCommand, String resultJson);
    void onDataReceivedFailed(String jsonCommand);
}

步骤二：http json 定义

package com.qtechnix.QuarkHq;

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.StrictMode;
import android.util.Log;
import android.widget.ListView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.google.gson.FieldNamingPolicy;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HttpJson extends AsyncTask<String, Void, Void> {

    private String _jsonResult;
    private String _jsonCommand;
    private Context _parentContext;
    private AsyncResponse _asyncResponse;

    public HttpJson(Context context) {
        _parentContext = context;
    }

    public void setAsyncResponse(AsyncResponse asyncResponse) {
        this._asyncResponse = asyncResponse;
    }

    @Override
    protected Void doInBackground(String... arg) {
        /*
            String domain = "";
            String member_req_token_url = "";
            // read responseURLEncoder.encode(para, "GBK");
            String urlWithParams = domain + member_req_token_url + "?userName=" + java.net.URLEncoder.encode(params[0], "utf-8") + "&password=" + params[1];
            URL url = new URL(urlWithParams);
        */

        _jsonCommand = arg[2];
        _jsonResult = doReq(arg[0], arg[1], _jsonCommand);
        return null;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        Log.e("gmx onPostExecute:", _jsonResult);
        if (_jsonResult == null) {
            _asyncResponse.onDataReceivedFailed(_jsonCommand);
        } else {
            _asyncResponse.onDataReceivedSuccess(_jsonCommand, _jsonResult);
        }
        super.onPostExecute(aVoid);
    }

    public 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();
    }

    //method = "GET" | "POST" | "PUT";
    public String doReq(String urlStr, String method, String apiName) {
        InputStream inputStream = null;
        HttpURLConnection httpConn = null;
        try {
            System.out.println("gmx:" + urlStr);
            URL url = new URL(urlStr);

            System.out.println("gmx: to create connection");
            httpConn = (HttpURLConnection) url.openConnection();
            //optional request header
            httpConn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            //optional request header
            httpConn.setRequestProperty("Accept", "application/json");
            // for Get request
            httpConn.setRequestMethod(method);
            httpConn.setDoOutput(true);
            httpConn.setDoInput(true);
            httpConn.setUseCaches(false);
            httpConn.setConnectTimeout(3000);
            httpConn.setReadTimeout(3000);

            System.out.println("gmx: to connect");
            httpConn.connect();
            DataOutputStream wr = new DataOutputStream(httpConn.getOutputStream());
            System.out.println("gmx: to new gson");
            Gson gs = new Gson();
            Map<String, String> dto = new HashMap<String, String>();
            dto.put("command", apiName);
            System.out.println("gmx:to invoke toJson()");
            String jsonString = gs.toJson(dto);
            System.out.println(jsonString);
            wr.writeBytes(jsonString);
            wr.flush();
            wr.close();
            System.out.println("gmx:to get response");
            int statusCode = httpConn.getResponseCode();
            // 200 represents HTTP OK
            if (statusCode == 200) {
                inputStream = new BufferedInputStream(httpConn.getInputStream());
                String str = convertStreamToString(inputStream);
                str = str.substring(0, str.length() - 1);
                return str;
            } else {
                System.out.println("gmx: error not 200");
            }
        }
        catch (Exception e) {
            Log.e("gmx", "error : ", e);
            System.out.println("gmx: Exception");
            e.printStackTrace();
        }
        finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (httpConn != null) {
                httpConn.disconnect();
            }
        }
        return null;
    }
}

 

 

步骤三：调用及分析返回（Main Activity）

 

HttpJson js = new HttpJson(MainActivity.this);
js.execute("http://192.168.0.23:7979", "POST", "get_runtime_info");
js.setAsyncResponse(new AsyncResponse() {
    @Override
    public void onDataReceivedSuccess(String jsonCommand, String jsonResult) {
        Log.d("gmx jsonResult", jsonResult);

//do anything such as, something = gson.fromGgson(jsonResult,CLASS);
...


    }
    @Override
    public void onDataReceivedFailed(String jsonCommand) {
        Log.e("gmx", "data received failed!");
    }
});