Android開發-網絡通訊2

調試了三種通訊方法：HttpClient、AsyncHttpClient 和 Volley 。

HttpClient 測試代碼^[1]：

public class HttpUtil {
    
    public static void sendRequestWithHttpClient(final String address, final List<NameValuePair> params, final HttpCallbackListener listener)
    {
        new Thread(new Runnable(){
            
            @Override
            public void run(){
                try{
                    
                    HttpPost httpPost= new HttpPost(address);
                    
                    HttpClient httpClient = new DefaultHttpClient();
                    UrlEncodedFormEntity postEntity;
                    postEntity = new UrlEncodedFormEntity(params,"utf-8");
                    httpPost.setEntity(postEntity);
                    HttpResponse httpResponse = httpClient.execute(httpPost);
                    if(httpResponse.getStatusLine().getStatusCode() == 200)
                    {
                        HttpEntity reEntity=httpResponse.getEntity();
                        String reposnse = EntityUtils.toString(reEntity,"utf-8");
                        if(listener != null)
                        {
                            listener.onFinish(reposnse);
                        }
                    }
                    
                }catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }).start();
    }

}

String usertel = et_usertel.getText().toString().trim();
String password = et_password.getText().toString().trim();
                
String url_login = "http://192.168.1.102:8999/weixin/index.php/Home/Index/test";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("usertel",usertel));
params.add(new BasicNameValuePair("password",password));
                
HttpUtil.sendRequestWithHttpClient(url_login,params,new HttpCallbackListener(){
    @Override
    public void onFinish(String response)
    {
        parseJSONWithJSONObject(response);
    }
    
    @Override
    public void onError(Exception e)
    {
        e.printStackTrace();
    }
});

private void parseJSONWithJSONObject(String jsonData){
    try{
        JSONArray jsonArray= new JSONArray(jsonData);
        Log.d("com.dlwz.playfootball","in parseJSONWithJSONObject");
        
        for(int i=0;i<jsonArray.length();i++)
        {                
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            String name = jsonObject.getString("usertel");
            String password = jsonObject.getString("password");
            Log.d("com.dlwz.playfootball","name:"+name+",password:"+password);
            dialog.dismiss();
            startActivity(new Intent(LoginActivity.this,MainActivity.class));
            
        }
    } catch(Exception e){
        e.printStackTrace();
    }
}

AsyncHttpClient 測試代碼^[2] ：

RequestParams params = new RequestParams();
params.put("username", email);
params.put("password", password);
AsyncHttpClient client = new AsyncHttpClient();
client.get("http://192.168.1.102:8081/useraccount/login/dologin",params ,new AsyncHttpResponseHandler() {
 // When the response returned by REST has Http response code '200'
 @Override
 public void onSuccess(String response) {
     // Hide Progress Dialog
     prgDialog.hide();
     try {
              // JSON Object
             JSONObject obj = new JSONObject(response);
             // When the JSON response has status boolean value assigned with true
             if(obj.getBoolean("status")){
                 Toast.makeText(getApplicationContext(), "You are successfully logged in!", Toast.LENGTH_LONG).show();
                 // Navigate to Home screen
                 navigatetoHomeActivity();
             } 
             // Else display error message
             else{
                 errorMsg.setText(obj.getString("error_msg"));
                 Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
             }
     } catch (JSONException e) {
         // TODO Auto-generated catch block
         Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
         e.printStackTrace();

     }
 }
 // When the response returned by REST has Http response code other than '200'
 @Override
 public void onFailure(int statusCode, Throwable error,
     String content) {
     // Hide Progress Dialog 
     prgDialog.hide();
     // When Http response code is '404'
     if(statusCode == 404){
         Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
     } 
     // When Http response code is '500'
     else if(statusCode == 500){
         Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
     } 
     // When Http response code other than 404, 500
     else{
         Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
     }
 }
});

Volley Post測試代碼^[3]：

RequestQueue mQueue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.POST,"http://192.168.1.102:8999/weixin/index.php/Home/Index/test",                        
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Log.d("TAG-onResponse", response);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("TAG-onErrorResponse", error.getMessage(), error);
            }
        }){
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> map = new HashMap<String, String>();
        map.put("username", "mabo@qq.com");
        map.put("password", "123456");
        return map;
    }
 };
mQueue.add(stringRequest);

 

 

參考資料：

一、類 HttpUtil 代碼參考自《第一行代碼 Android》第10章5小節，只是將 HttpURLConnection 換成了 HttpClient。parseJSONWithJSONObject 參考自該書 400 頁。該書做者郭霖，csdn博客：http://blog.csdn.net/guolin_blog/ 。

二、該代碼參考自 http://programmerguru.com/android-tutorial/android-restful-webservice-tutorial-how-to-call-restful-webservice-in-android-part-3/?utm_source=tuicool 。該文共三部分，經過演示一個包含前端後端的例子介紹了 Restful Webservice 在 Android 開發中的應用。當時調試時 Android 端沒什麼問題，照着一步步來就沒錯，但服務器端用 Eclipse EE 建立動態web，在運行時報了錯，經調試發現是在 Class.forName(Constants.dbClass) 處報了錯，String dbClass = "com.mysql.jdbc.Driver" ，下載了個com.mysql.jdbc.Driver 導入才成功。

三、該代碼參考自《第一行代碼 Android》做者郭霖的博客：http://blog.csdn.net/guolin_blog/article/details/17482095 。測試該代碼遇到了幾個問題：首先就是因爲防火牆的緣由，volley 沒法用 Git 直接 clone ，不得不設置代理才成功下載。第二個問題是 volley 的 jar 包生成，網上有很多方法，但在我這沒成功。好比 stormzhang 的命令行，郭霖的經過 eclipse 導出 jar 包，多是因爲版本更新的緣由，這些方法都沒行，後來仍是用 Android Studio 順利編譯生成 jar 包。終於能夠在工程中順利使用。第三個問題就是我本身犯的低級錯誤，web服務端直接用了上面AsyncHttpClient 的服務端程序，Android 端 Post 數據過去，但我沒注意到服務器端只能處理 get 的 url ，由於以前用ThinkPhp 時是不用區分 get 和 post 的，處理方式同樣。沒想到 java 端反而要區分，耗費了很多時間才查出來。