Android POST GET請求

Android POST GET請求

Android應用經常會和伺服器端互動，這就需要手機用戶端發送網路請求，下面介紹常用的兩種網路請求方式POST，GET。首先要區別POST和GET請求 1. GET是從伺服器上擷取資料，POST是向伺服器傳送資料。 2. GET是把參數資料隊列加到提交表單的ACTION屬性所指的URL中，值和表單內各個欄位一一對應，在URL中可以看到。POST是通過HTTP post機制，將表單內各個欄位與其內容放置在HTML HEADER內一起傳送到ACTION屬性所指的URL地址。使用者看不到這個過程 3. GET方式提交的資料最多隻能是1024位元組，理論上POST沒有限制，可傳較大量的資料 4. GET安全性非常低，POST安全性較高。但是執行效率卻比POST方法好。 下面分別用Post和GET方法來實現Android應用的人員登入，首先我們搭建一個伺服器，這裡我使用WAMP環境，使用ThinkPHP架構。詳細的伺服器搭建就不說了。給出主要響應代碼： namespace Home\Controller; use Think\Controller; class AndroidController extends Controller { public function index() { //擷取帳號密碼 $id=I('username'); $pwd=I('password'); $User=M('user'); //查詢資料庫 $data = $User->where("NAME='$id' AND PASSWORD='$pwd' ")->find(); //登入成功 if($data) { $response = array('success' => true,'msg'=>'登入成功');   $response=json_encode($response); echo $response;//返回json格式 } //登入失敗 else { $response = array('success' => false,'msg'=>'帳號或密碼錯誤'); $response=json_encode($response); echo $response;//返回json格式 } }   } 複製代碼 記得添加網路許可權 Android的網路請求主要使用java.net包中的HttpURLConnection類，伺服器與Android用戶端資料互動格式為json 1.利用POST請求方式來實現人員登入。 package com.dream.apm;   import android.app.Activity; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.Toast; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;   import java.io.*; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder;   public class MyActivity extends Activity {   //請求地址 private static String url="http://10.0.2.2:8080/think/index.php/Home/Android"; public Button start;   public EditText username,password;   public URL http_url;   public String data;   public Handler handler;   @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); //設定全屏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //去除應用程式標題 this.requestWindowFeature(Window.FEATURE_NO_TITLE); //設定豎屏 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); setContentView(R.layout.main);   start=(Button)findViewById(R.id.start_one); username=(EditText)findViewById(R.id.username); password=(EditText)findViewById(R.id.password); //訊息處理器   handler=new Handler(Looper.getMainLooper()) { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch(msg.what) { //登入成功 case 1: Toast.makeText(MyActivity.this, msg.getData().getString("msg"), Toast.LENGTH_SHORT).show(); break; //登入失敗 case 2: Toast.makeText(MyActivity.this, msg.getData().getString("msg"), Toast.LENGTH_SHORT).show(); break;   } } };   start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //是否輸入帳號密碼 if(username.getText().toString().length()>0&&password.getText().toString().length()>0){ //子線程可以擷取UI的值，不能更改 new Thread(new Runnable() { @Override public void run() { try { http_url=new URL(url); if(http_url!=null) { //開啟一個HttpURLConnection串連 HttpURLConnection conn = (HttpURLConnection) http_url.openConnection(); conn.setConnectTimeout(5* 1000);//設定連線逾時 conn.setRequestMethod("POST");//以get方式發起請求 //允許輸入輸出資料流 conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false);//使用Post方式不能使用緩衝 //擷取帳號密碼 String params = "username=" + username.getText().toString() + "&password=" + password.getText().toString(); //佈建要求體的類型是文本類型 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); //佈建要求體的長度--位元組長度 conn.setRequestProperty("Content-Length",String.valueOf(params.getBytes().length) ); //發送post參數 BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(conn.getOutputStream())); bw.write(params); bw.close(); //接收伺服器響應 if (conn.getResponseCode() == 200) { InputStream is = conn.getInputStream();//得到網路返回的輸入資料流 BufferedReader buf=new BufferedReader(new InputStreamReader(is));//轉化為字元緩衝流 data=buf.readLine(); buf.close();is.close(); //判斷登入結果 analyse(data); } } } catch( Exception e) { e.printStackTrace(); } } }).start(); } else { Toast.makeText(MyActivity.this, "請完整輸入帳號密碼", Toast.LENGTH_SHORT).show(); } } }); }   public void analyse (String data) { System.out.println(data); try { JSONObject json_data=new JSONObject(data); Boolean state=json_data.getBoolean("success"); String msg=json_data.getString("msg"); //登入成功 if(state) { //發送訊息 Message message= new Message(); message.what=1; Bundle temp = new Bundle(); temp.putString("msg",msg); message.setData(temp); handler.sendMessage(message);   } //登入失敗 else { Message message= new Message(); message.what=2; Bundle temp = new Bundle(); temp.putString("msg",msg); message.setData(temp); handler.sendMessage(message); } } catch (JSONException e) { e.printStackTrace(); } } } 複製代碼 2.利用GET請求方式來實現人員登入 package com.dream.apm;   import android.app.Activity; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.Toast; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;   import java.io.*; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder;   public class MyActivity extends Activity {   public Button start;   public EditText username,password;   public URL http_url;   public String data;   public Handler handler;   @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); //設定全屏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //去除應用程式標題 this.requestWindowFeature(Window.FEATURE_NO_TITLE); //設定豎屏 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); setContentView(R.layout.main);   start=(Button)findViewById(R.id.start_one); username=(EditText)findViewById(R.id.username); password=(EditText)findViewById(R.id.password); //訊息處理器   handler=new Handler(Looper.getMainLooper()) { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch(msg.what) { //登入成功 case 1: Toast.makeText(MyActivity.this, msg.getData().getString("msg"), Toast.LENGTH_SHORT).show(); break; //登入失敗 case 2: Toast.makeText(MyActivity.this, msg.getData().getString("msg"), Toast.LENGTH_SHORT).show(); break;   } } };   start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //是否輸入帳號密碼 if(username.getText().toString().length()>0&&password.getText().toString().length()>0){ //子線程可以擷取UI的值，不能更改 new Thread(new Runnable() { @Override public void run() { try { //請求地址-- String url="http://10.0.2.2:8080/think/index.php/Home/Android?"+ "username=" + URLEncoder.encode(username.getText().toString(), "UTF-8") + "&password=" + URLEncoder.encode(password.getText().toString(), "UTF-8"); http_url=new URL(url); if(http_url!=null) { //開啟一個HttpURLConnection串連 HttpURLConnection conn = (HttpURLConnection) http_url.openConnection(); conn.setConnectTimeout(5* 1000);//設定連線逾時 conn.setRequestMethod("GET");//以get方式發起請求 //允許輸入資料流 conn.setDoInput(true); //接收伺服器響應 if (conn.getResponseCode() == 200) { InputStream is = conn.getInputStream();//得到網路返回的輸入資料流 BufferedReader buf=new BufferedReader(new InputStreamReader(is));//轉化為字元緩衝流 data=buf.readLine(); buf.close();is.close(); //判斷登入結果 analyse(data); } } } catch( Exception e) { e.printStackTrace(); } } }).start(); } else { Toast.makeText(MyActivity.this, "請完整輸入帳號密碼", Toast.LENGTH_SHORT).show(); } } }); }   public void analyse (String data) { System.out.println(data); try { JSONObject json_data=new JSONObject(data); Boolean state=json_data.getBoolean("success"); String msg=json_data.getString("msg"); //登入成功 if(state) { //發送訊息 Message message= new Message(); message.what=1; Bundle temp = new Bundle(); temp.putString("msg",msg); message.setData(temp); handler.sendMessage(message);   } //登入失敗 else { Message message= new Message(); message.what=2; Bundle temp = new Bundle(); temp.putString("msg",msg); message.setData(temp); handler.sendMessage(message); } } catch (JSONException e) { e.printStackTrace(); } } } 複製代碼 運行結果：