Android基礎（九）網絡技術

Webview的使用

Android加載網頁的方式

可參考鏈接博客，具體細節問題仍需百度，偷笑

 

使用http協議訪問網絡

 

HttpURLConnection的使用

    private void sendRequestHttpURLConnection() {
        //開啓線程發送網絡請求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection httpURLConnection = null;
                BufferedReader bufferedReader = null;
                try {
                    URL url = new URL("https://www.baidu.com");
                    httpURLConnection = (HttpURLConnection) url.openConnection();

                    //get請求
                    httpURLConnection.setRequestMethod("GET");
                    //post請求
//                    httpURLConnection.setRequestMethod("POST");
//                    DataOutputStream dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());
//                    dataOutputStream.writeBytes("usename=18130652068&password=123456");

                    httpURLConnection.setConnectTimeout(8000);
                    httpURLConnection.setReadTimeout(8000);
                    InputStream inputStream = httpURLConnection.getInputStream();
                    //下面對獲取的數據流進行讀取
                    bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = bufferedReader.readLine()) != null) {
                        response.append(line);
                    }
                    showResponse(response.toString());


                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (bufferedReader != null) {
                        try {
                            bufferedReader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (httpURLConnection != null) {
                        httpURLConnection.disconnect();
                    }
                }
            }
        }).start();
    }

需要注意網絡的權限以及流的關閉

OKhttp的使用

    private void sendRequestOkhttp() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient okHttpClient = new OkHttpClient();

                    //post
//                    RequestBody requestBody = new FormBody.Builder()
//                            .add("usename","56464")
//                            .add("password","132131")
//                            .build();

                    Request request = new Request.Builder()
//                            .url("https://www.baidu.com")
                            .url("http://192.168.2.104:99/get_data.xml")
                            //post請求
//                            .post(requestBody)
                            .build();
                    Response response = okHttpClient.newCall(request).execute();
                    String string = response.body().toString();
//                    parseXMLWithPull(string);
//                    parseXMLWithSax(string);
//                    parseJSONWithJSonObject(string);
                    parseJSONWithGSON(string);
//                    showResponse(string);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();


    }

需要注意添加第三方依賴

 

數據的解析

 

Apache服務的安裝

需要注意 安裝時需要用引號包裹路徑（參考下面這個就行了）

Apache服務器最新版下載、安裝及配置（windows版）

XML數據解析

Pull解析方式

    //xml解析pull
    private void parseXMLWithPull(String string) {
        try {
            XmlPullParserFactory xmlPullParserFactory = XmlPullParserFactory.newInstance();
            XmlPullParser xmlPullParser = xmlPullParserFactory.newPullParser();
            xmlPullParser.setInput(new StringReader(string));
            int eventType = xmlPullParser.getEventType();
            String id = "";
            String name = "";
            String vision = "";
            while (eventType != xmlPullParser.END_DOCUMENT) {
                String nodeName = xmlPullParser.getName();
                switch (eventType) {
                    //開始解析某個節點
                    case XmlPullParser.START_TAG: {
                        if ("id".equals(nodeName)) {
                            id = xmlPullParser.nextText();
                        } else if ("name".equals(nodeName)) {
                            name = xmlPullParser.nextText();
                        } else if ("vision".equals(nodeName)) {
                            vision = xmlPullParser.nextText();
                        }
                        break;
                    }
                    //完成解析某個節點
                    case XmlPullParser.END_TAG: {
                        if ("app".equals(nodeName)) {
                            Log.d(TAG, "id " + id);
                            Log.d(TAG, "name " + name);
                            Log.d(TAG, "vision " + vision);
                        }
                        break;
                    }
                    default:
                        break;


                }
                eventType = xmlPullParser.next();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Sax解析方式

//xml解析sax
private void parseXMLWithSax(String string) {
    try {
        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        XMLReader xmlReader = saxParserFactory.newSAXParser().getXMLReader();
        MyHandler myHandler = new MyHandler();
        //將MyHandler實例設置到xmlReader
        xmlReader.setContentHandler(myHandler);
        //開始執行解析
        xmlReader.parse(new InputSource(new StringReader(string)));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

JSON數據解析

JSONObject解析方式

    //json解析 jsonobject
    private void parseJSONWithJSonObject(String string) {
        try {
            JSONArray jsonArray = new JSONArray(string);
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String id = jsonObject.getString("id");
                String name = jsonObject.getString("name");
                String version = jsonObject.getString("version");
                Log.d(TAG, "id " + id);
                Log.d(TAG, "name " + name);
                Log.d(TAG, "version " + version);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

GSON解析方式

    //json解析 Gson
    private void parseJSONWithGSON(String string) {
        Gson gson = new Gson();
        List<App> appList = gson.fromJson(string,new TypeToken<List<App>>(){}.getType());
        for (App app : appList) {
            Log.d(TAG, "id " + app.getId());
            Log.d(TAG, "name " + app.getName());
            Log.d(TAG, "version " + app.getVersion());
        }
    }

需要注意添加第三方依賴

網絡請求的封裝

package www.yfg.com.httpurlconnectiontest.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

/**
 * @version: v1.0
 * @description: 網絡封裝
 * @package: www.yfg.com.httpurlconnectiontest
 * @author: yfg
 * @date :2019/11/22
 */
public class HttpUtil {

    //一般get請求封裝
    public static void sendRequestHttp(final String address,final HttpCallbackListen httpCallbackListen) {
        //開啓線程發送網絡請求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection httpURLConnection = null;
                BufferedReader bufferedReader = null;
                try {
                    URL url = new URL(address);
                    httpURLConnection = (HttpURLConnection) url.openConnection();

                    //get請求
                    httpURLConnection.setRequestMethod("GET");

                    httpURLConnection.setConnectTimeout(8000);
                    httpURLConnection.setReadTimeout(8000);
                    InputStream inputStream = httpURLConnection.getInputStream();
                    //下面對獲取的數據流進行讀取
                    bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = bufferedReader.readLine()) != null) {
                        response.append(line);
                    }
                    //利用回調返回主線程操作
                    if (httpCallbackListen != null){
                        httpCallbackListen.onFinish(response.toString());
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                    //利用回調返回主線程操作
                    if (httpCallbackListen != null){
                        httpCallbackListen.onError(e);
                    }
                } finally {
                    if (bufferedReader != null) {
                        try {
                            bufferedReader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (httpURLConnection != null) {
                        httpURLConnection.disconnect();
                    }
                }
            }
        }).start();
    }

    public static void sendRequestOkHttp(final String address, final Callback callback){
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient okHttpClient = new OkHttpClient();
                    Request request = new Request.Builder()
                            .url(address)
                            .build();
               okHttpClient.newCall(request).enqueue(callback);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }

}

用回調來返回請求結果

package www.yfg.com.httpurlconnectiontest.utils;

/**
 * @version: v1.0
 * @description: 回調接口
 * @package: www.yfg.com.httpurlconnectiontest.utils
 * @author: yfg
 * @date :2019/11/22
 */
public interface HttpCallbackListen {

    void onFinish(String response);
    void onError(Exception e);

}