網絡請求框架

網絡請求框架

1. HttpURLConnection(Sun)
2. HttpClient((Android內置,6.0後移除))
3. AsyncHttpClient
4. xUtils
5. OKHttp(Square)
6. Volley(Google)
7. Retrofit
8. 獲取網絡狀態

注:凡是向服務器提交數據用POST,凡是向服務器獲取數據用GET

01-HttpURLConnection

---

//get方式
InputStream inputStream = newURL("http://www.baidu.com?username=zhangsan&age=23")
.openConnection()
.getInputStream();

//post方式
URL url = new URL(path);
HttpURLConnection  connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);//設置允許給服務器提交數據流
connection.setRequestMethod("POST");
//獲取對外輸出流
OutputStream os = connection.getOutputStream();
os.write(("advice="+URLEncoder.encode(advice)+"&contact="+contact).getBytes());
/*
 * 注意:一定順序不要寫錯,先輸出,在輸入
 */
InputStream is = connection.getInputStream();
String is2Str = StreamUtils.is2Str(is);

02-AsyncHttpClient

---

//1. get
AsyncHttpClient client = new AsyncHttpClient();
/*
 * 參數2:網絡訪問的監聽
 */
client.get(path+"?advice="+URLEncoder.encode(advice)+"&contact="+contact, new AsyncHttpResponseHandler(){
  @Override
  public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
    Log.d("tag", "ThreadName="+Thread.currentThread().getName());
    String string = new String(responseBody);
    Toast.makeText(MainActivity.this, string, Toast.LENGTH_SHORT).show();
  }
  @Override
  public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
    Log.d("tag", "ThreadName="+Thread.currentThread().getName());
    Toast.makeText(MainActivity.this, "異常:"+error, Toast.LENGTH_SHORT).show();
  }
});

//2. post
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("advice", advice);
params.put("contact", contact);
/*
 * 參數2:post請求給服務器提交的參數
 */
client.post(path, params, new AsyncHttpResponseHandler(){
  @Override
  public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
    Log.d("tag", "ThreadName="+Thread.currentThread().getName());
    String string = new String(responseBody);
    Toast.makeText(MainActivity.this, string, Toast.LENGTH_SHORT).show();
  }
  @Override
  public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
    Log.d("tag", "ThreadName="+Thread.currentThread().getName());
    Toast.makeText(MainActivity.this, "異常:"+error, Toast.LENGTH_SHORT).show();
  }
});

03-xUtils

注:xUtils:國產的,擴展性不好,一般只用它的斷點下載功能

---

/*
 * 1. 創建一個核心類
 */
HttpUtils httpUtils = new HttpUtils();

File file = new File(Environment.getExternalStorageDirectory(), "b.mp3");

/*
 * 參數1:網絡文件的URL地址
 * 參數2:要保存到本地的地址
 * 參數3:是否支持斷點續傳
 * 參數4:是否重命名
 */
httpHandler = httpUtils.download(path, file.getAbsolutePath(), true, false, new RequestCallBack<File>() {

  @Override
  public void onSuccess(ResponseInfo<File> responseInfo) {
    Toast.makeText(MainActivity.this, "下載成功"+responseInfo.result.getAbsolutePath(), Toast.LENGTH_SHORT).show();
  }

  @Override
  public void onFailure(HttpException error, String msg) {
    Toast.makeText(MainActivity.this, "error="+error+"/msg="+msg, Toast.LENGTH_SHORT).show();
  }

  @Override
  public void onLoading(long total, long current, boolean isUploading) {
    Log.d("tag", "current="+current);
    pb.setProgress((int) ((current*100/total)));

  }
});

04-OKHttp(Square)

注:OKhttp的enqueue是在子線程中執行的,
1. get提交數據

---

public void get(View view) {
  /*
   * 1. 創建一個核心對象
   */
  OkHttpClient okHttpClient = new OkHttpClient();
  /*
   * 3. 創建一個請求對象Request
   */
  Request request = new Request.Builder()
  .url("http://10.0.2.2:8080/helloWeb/CommentServlet?advice=張三&contact=123456")
  .build();
  /*
   * 2. 讓okHttpClient創建新的請求任務
   */
  Call newCall = okHttpClient.newCall(request);
  /*
   * 4. 執行請求任務
   */
  newCall.enqueue(new Callback() {
    @Override
    public void onResponse(Call call, Response response) throws IOException {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      // 獲取狀態碼
      int code = response.code();
      Log.d("tag", "code=" + code);
      // 獲取服務器返回的數據
      String result = response.body().string();
      handler.obtainMessage(1, result).sendToTarget();
    }
    @Override
    public void onFailure(Call call, IOException e) {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      handler.obtainMessage(2, e).sendToTarget();

    }
  });
}

2. post提交數據

---

public void post(View view) {
  //1
  OkHttpClient okHttpClient = new OkHttpClient();

//  Builder builder = new FormBody.Builder();
//  builder.add("advice", "雨澤");
//  builder.add("contact", "王五");
//  FormBody formBody = builder.build();
  RequestBody body = new FormBody.Builder()
  .add("advice", "雨澤")
  .add("contact", "王五")
  .build();
//  okhttp3.Request.Builder builder2 = new Request.Builder();
//  builder2.url("http://10.0.2.2:8080/helloWeb/CommentServlet");
//  builder2.post(formBody);
//  Request request2 = builder2.build();
  Request request = new Request.Builder()
  .url("http://10.0.2.2:8080/helloWeb/CommentServlet")
  .post(body)
  .build();
  //2 
  Call newCall = okHttpClient.newCall(request);

  newCall.enqueue(new Callback() {

    @Override
    public void onResponse(Call call, Response response) throws IOException {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      // 獲取狀態碼
      int code = response.code();
      Log.d("tag", "code=" + code);
      // 獲取服務器返回的數據
      String result = response.body().string();
      handler.obtainMessage(1, result).sendToTarget();
    }

    @Override
    public void onFailure(Call call, IOException e) {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      handler.obtainMessage(2, e).sendToTarget();
    }
  });
}

3. 文件上傳(post)

---

public void upload(View view) {
  //將本地sdcard中的sms.xml上傳到服務器
  OkHttpClient okHttpClient = new OkHttpClient();
  //常見請求體對象,因爲要文件上傳,所有創建的是MultipartBody對象
  RequestBody body = new MultipartBody.Builder()
  /*
   * 參數1:對應文件參數的name屬性:相當於 : <input type="file" name="myfile"><br><br>
   * 參數2:文件的名稱,僅僅是名稱
   * 參數3:文件的類型 MediaType.parse("image/jpg")
   * 參數4:真正要上傳的文件
   */
  .addFormDataPart("myfile", "sms.xml", RequestBody.create(MediaType.parse("*/*"), new File(Environment.getExternalStorageDirectory(), "sms.xml")))
  .build();

  //創建請求對象
  Request request = new Request.Builder()
  .url("http://10.0.2.2:8080/helloWeb/UploadServlet")
  .post(body)
  .build();
  //創建一個新的請求任務
  Call newCall = okHttpClient.newCall(request);
  //執行任務
  newCall.enqueue(new Callback() {

    @Override
    public void onResponse(Call call, Response response) throws IOException {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      // 獲取狀態碼
      int code = response.code();
      Log.d("tag", "code=" + code);
      // 獲取服務器返回的數據
      String result = response.body().string();
      handler.obtainMessage(1, result).sendToTarget();
    }

    @Override
    public void onFailure(Call call, IOException e) {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      handler.obtainMessage(2, e).sendToTarget();

    }
  });
}

4. 文件下載(get)

---

public void download(View view) {
  //http://localhost:8080/helloWeb/五環.mp4
  /*
   * 1. 創建核心類
   */
  OkHttpClient okHttpClient = new OkHttpClient();
  /*
   * 3. 創建請求對象
   */
  Request request = new Request.Builder()
  .url("http://10.0.2.2:8080/helloWeb/fiveringnihao.mp4")
  .build();
  /*
   * 2. 創建新的請求任務
   */
  Call newCall = okHttpClient.newCall(request);
  /*
   * 4. 異步執行任務
   */
  newCall.enqueue(new Callback() {
    @Override
    public void onResponse(Call call, Response response) throws IOException {
      if (response.code()!=200) {
        handler.obtainMessage(2,"狀態碼不正確:"+response.code()).sendToTarget();
        return;
      }

      //將下載的文件保存到sdcard上
      InputStream is = response.body().byteStream();
      FileOutputStream fos = new FileOutputStream(new File(Environment.getExternalStorageDirectory(), "fivering.mp4"));
      byte[] buffer = new byte[1024];
      int len = -1;
      while((len=is.read(buffer))!=-1){
        fos.write(buffer, 0, len);
      }
      fos.close();
      is.close();

      handler.obtainMessage(1, "下載完畢").sendToTarget();
    }

    @Override
    public void onFailure(Call call, IOException e) {
      Log.d("tag", "ThreadName=" + Thread.currentThread().getName());
      handler.obtainMessage(2, e).sendToTarget();
    }
  });
}

08-獲取網絡狀態

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
//獲取當前可用的網絡,如果當前沒有可用的網絡,返回null
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetworkInfo==null) {
  tv_state.setText("當前沒有可用的網絡");
  tv_state.setTextColor(Color.parseColor("#ff0000"));

}else {
  //獲取當前網絡的名稱"MOBILE","WIFI"
  String typeName = activeNetworkInfo.getTypeName();
  //如果是"MOBILE"類型網絡,我們可以進一步獲取4G(LET)或者3G
  String subtypeName = activeNetworkInfo.getSubtypeName();

  tv_state.setTextColor(Color.BLUE);
  tv_state.setText("當前網絡類型:"+typeName+"/"+subtypeName);
}