Android0914（()Android網絡連接HttpConnection、Volley，xUtils）（待更ing）

HttpConnection

HttpClient 是一個接口，因此無法創建它的實例，通常情況下都會創建一個DefaultHttpClient的實例，如下:

HttpClient client=new DefaultHttpClient();//生成client方法；

DoGet

接下來就是發起一條Get請求，就可以創建一個HttpGet對象，並傳入目標網絡地址，然後調用HttpClient的execute()方法即可

HttpGet get=new HttpGet(stringurl);//設置爲get方法；
client.execute(get);

DoPost

發出一個DoPost請求

 HttpPost post=new HttpPost(urlString);

通過一個NameValuePair()集合來存放待提交的參數，並將這個參數集合傳入到一個UrlEncodedFormEntity中，然後調用HttpPost的setEntity()方法將構建好的UrlEncodedFormEntity傳入，如下：

 NameValuePair pair1=new BasicNameValuePair("username","ZHANGSAN");
NameValuePair pair2=new BasicNameValuePair("password","1234");
ArrayList<NameValuePair> list=new ArrayList<NameValuePair>();
list.add(pair1);
list.add(pair2);
post.setEntity(new UrlEncodedFormEntity(list, "UTF-8"));
post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

最後執行HttoClient的execute()方法

myDopostTask.execute();

由於需要連接網絡，需要讀寫權限AndroidManifest.xml修改如下：

<uses-permission android:name="ANDROID.PERMISSION.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="HttpClientGet"/>
    <Button
        android:id="@+id/btn_post"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="HttpClientPost"/>
</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private Button btn_get;
    private Button btn_post;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_get= (Button) findViewById(R.id.btn_get);
        btn_post= (Button) findViewById(R.id.btn_post);
        btn_get.setOnClickListener(this);
        btn_post.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.btn_get:
                MyDogetTask myDogetTask=new MyDogetTask();
                myDogetTask.execute();
                break;
            case R.id.btn_post:
                MyDopostTask myDopostTask=new MyDopostTask();
                myDopostTask.execute();
                break;
            default :
                break;
        }
    }
    class MyDogetTask extends AsyncTask<String,String,String> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
        }

        @Override
        protected void onProgressUpdate(String... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected String doInBackground(String... strings) {
            String urlString="http://http://192.168.0.82:8080/MyServerTest/MyTestServerlet?username=lisi&password=123456";
            HttpClient client=new DefaultHttpClient();
            HttpGet get=new HttpGet(urlString);//設置爲get方法
            //設置服務器接收後數據的讀取方式爲utf8
            get.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
            try {
                HttpResponse response = client.execute(get);//執行get方法得到服務器的返回的所有數據都在response中
                StatusLine statusLine=response.getStatusLine();//httpClient訪問服務器返回的表頭，包含http狀態碼
                int code=statusLine.getStatusCode();//得到狀態碼
                System.out.println("狀態碼爲："+code);
                if(code== HttpURLConnection.HTTP_OK){
                    HttpEntity entity=response.getEntity();//得到數據的實體
                    InputStream is=entity.getContent();//得到輸入流
                    BufferedReader br=new BufferedReader(new InputStreamReader(is));
                    String line=br.readLine();
                    while(line!=null){
                        System.out.println(line);
                        line=br.readLine();
                    }
                }
            } catch (ClientProtocolException e1) {
                e1.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
            return null;
        }
    }
    class MyDopostTask extends AsyncTask<String,String,String>{
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
        }

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

        @Override
        protected void onProgressUpdate(String... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected String doInBackground(String... strings) {
            String urlString="http://http://192.168.0.82:8080/MyServerTest/MyTestServerlet";
            HttpClient client=new DefaultHttpClient();
            HttpPost post=new HttpPost(urlString);
            NameValuePair pair1=new BasicNameValuePair("username","ZHANGSAN");
            NameValuePair pair2=new BasicNameValuePair("password","1234");
            ArrayList<NameValuePair> list=new ArrayList<NameValuePair>();
            list.add(pair1);
            list.add(pair2);
            try {
                post.setEntity(new UrlEncodedFormEntity(list, "UTF-8"));
                post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
                HttpResponse response=client.execute(post);
                int code=response.getStatusLine().getStatusCode();
                if(code==HttpURLConnection.HTTP_OK){
                    HttpEntity entity=response.getEntity();
                    InputStream is=entity.getContent();
                    BufferedReader br=new BufferedReader(new InputStreamReader(is));
                    String line=br.readLine();
                    while(line!=null){
                        System.out.println(line);
                        line=br.readLine();
                    }
                }
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            } catch (ClientProtocolException e1) {
                e1.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
            return null;
        }
    }
}

Vollet

在使用Volley之前需導入
eu.the4thfloor.volley:com.android.volley:2015.05.28這個包，導包可以有兩種方法
1，按照順序找到第4 處直接輸入
eu.the4thfloor.volley:com.android.volley:2015.05.28找到jar包進行下載即可

2、從網上下載jar包，複製到libs包下，再在導進來進行了

Volley的機制圖

MainActivity（單例設計目的：每次請求時都生成同一個消息請求隊列，而沒有必要每次請求都生成一個新的消息隊列，）
activity_volley.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    <Button
        android:id="@+id/btn_volley"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="volley"/>
    <Button
        android:id="@+id/button_networkimage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="NetWorkImage"/>
    </LinearLayout>
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <com.android.volley.toolbox.NetworkImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/networkimage"/>
    </ScrollView>
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    <TextView
    android:id="@+id/text_volley"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Volley內容"/>
    </ScrollView>
</LinearLayout>

VolleyActivity.java

public class VolleyActivity extends AppCompatActivity implements View.OnClickListener{
    private TextView text_volley;
    private Button btn_volley;
    private Button btn_networkimage;
    private NetworkImageView networkImageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_volley);
        btn_volley= (Button) findViewById(R.id.btn_volley);
        btn_volley.setOnClickListener(this);
        text_volley= (TextView) findViewById(R.id.text_volley);
        btn_networkimage= (Button) findViewById(R.id.button_networkimage);
        btn_networkimage.setOnClickListener(this);
        networkImageView= (NetworkImageView) findViewById(R.id.networkimage);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.button_networkimage:

                networkImageView.setImageUrl("http://img3.imgtn.bdimg.com/it/u=2975755759,394391192&fm=23&gp=0.jpg", MySingleton.getInstance(this).getImageLoader());
                networkImageView.setImageUrl("http://www.daxueit.com/upload/201408/13/101047281001237.png", MySingleton.getInstance(this).getImageLoader());
                break;
            case R.id.btn_volley:

                RequestQueue queue=Volley.newRequestQueue(getApplicationContext());
//                StringRequest request=new StringRequest(Request.Method.GET, "http://192.168.0.30:8080/MyWebTest/MyTestServerlet", new Response.Listener<String>(){
                StringRequest request=new StringRequest(Request.Method.GET, "http://192.168.0.82:8080/MyServersTest", new Response.Listener<String>(){
//                StringRequest request=new StringRequest(Request.Method.GET, "http://www.360.com", new Response.Listener<String>(){
//                StringRequest request=new StringRequest(Request.Method.POST, "http://192.168.0.30:8080/MyWebTest/MyTestServerlet", new Response.Listener<String>(){
                    @Override
                    public void onResponse(String response) {
                        text_volley.setText(response);}
                    },new ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        text_volley.setText("網絡連接錯誤");
                    }
                }) {
//                }){
//                    @Override
//                    protected Map<String, String> getParams() throws AuthFailureError {
//                        HashMap<String,String>map=new HashMap<>();
//                        map.put("username","lisiwang");
//                        return map;
//                    }
//                };
                };
//                queue.add(request);
                MySingleton.getInstance(getApplicationContext()).addToRequestQueue(request);
                break;
        }

MySingleton.java

public class MySingleton {
    private static MySingleton mInstance;
    private RequestQueue mRequestQueue;
    private ImageLoader mImageLoader;
    private static Context mCtx;

    private MySingleton(Context context) {
    mCtx = context;
    mRequestQueue = getRequestQueue();

    mImageLoader = new ImageLoader(mRequestQueue,
                                   new ImageLoader.ImageCache() {
        private final LruCache<String, Bitmap>
                cache = new LruCache<String, Bitmap>(20);

        @Override
        public Bitmap getBitmap(String url) {
            return cache.get(url);
        }

        @Override
        public void putBitmap(String url, Bitmap bitmap) {
            cache.put(url, bitmap);
        }
    });

}

    public static synchronized MySingleton getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MySingleton(context);
        }
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            // getApplicationContext() is key, it keeps you from leaking the
            // Activity or BroadcastReceiver if someone passes one in.
            mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req) {
        getRequestQueue().add(req);
    }

    public ImageLoader getImageLoader() {
        return mImageLoader;
    }
}

xUtils

activity_xutils.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
<Button
        android:id="@+id/btn_xutils_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get網絡內容"/>
    <Button
        android:id="@+id/btn_xutils_post"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Post網絡內容"/>
    </LinearLayout>
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    <TextView
        android:id="@+id/text_xutils"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="xutils內容"/>
    </ScrollView>
</LinearLayout>

XutilsActivity.java

public class XutilsActivity extends Activity implements View.OnClickListener{
    @ViewInject(R.id.btn_xutils_get)
    private Button button_get;
    @ViewInject(R.id.text_xutils)
    private TextView text_xutils;
    @ViewInject(R.id.btn_xutils_post)
    private Button  button_post;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_xutils);
       com.lidroid.xutils.ViewUtils.inject(this);
//        button_get = (Button) findViewById(R.id.btn_xutils_get);
//        button_get.setOnClickListener(this);
//        button_post= (Button) findViewById(R.id.btn_xutils_post);
//        button_post.setOnClickListener(this);
//        text_xutils= (TextView) findViewById(R.id.text_xutils);

    }
    @OnClick({R.id.btn_xutils_get,R.id.btn_xutils_post})
    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.btn_xutils_post:
                HttpUtils clientPost=new HttpUtils();
                RequestParams params=new RequestParams();
                params.addBodyParameter("username","xutilspost");
                clientPost.send(HttpRequest.HttpMethod.POST, "http://192.168.0.82:8080/MyServersTest", params, new RequestCallBack<String>()
//                        clientPost.send(HttpRequest.HttpMethod.POST, "http://192.168.0.30:8080/MyWebTest/MyTestServerlet", params, new RequestCallBack<String>()
                {
                    @Override
                    public void onSuccess(ResponseInfo<String> responseInfo) {
                        text_xutils.setText(responseInfo.result);
                    }

                    @Override
                    public void onFailure(HttpException e, String s) {
                        text_xutils.setText("網絡連接錯誤");
                    }
                });
                break;
            case R.id.btn_xutils_get:
               HttpUtils clientGet=new HttpUtils();
                clientGet.send(HttpRequest.HttpMethod.GET, "http://www.360.com", new RequestCallBack<String>() {
                    @Override
                    public void onSuccess(ResponseInfo<String> responseInfo) {
                        text_xutils.setText(responseInfo.result);
                    }

                    @Override
                    public void onFailure(HttpException e, String s) {
                        text_xutils.setText("網絡連接錯誤");
                    }
                });
                break;
        }
    }
}

Android0914（()Android網絡連接HttpConnection、Volley，xUtils）（待更ing）

HttpConnection

DoGet

DoPost

Vollet

xUtils

HttpConnection的Dopost方法，Volley的DoPost方法，xUtils的DoPost方法

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