【達內課程】網路通訊之Post例項和解析Json(2)
阿新 • • 發佈:2019-02-06
如何使用Android程式碼傳送HTTP POST請求
1、建立URL物件
URL url = new URL("http://xxx");
2、建立HttpURLConnection物件
conn = url.openConnection()
3、設定訊息方式和訊息頭
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
(multipart/form-date)
4、設定開啟輸出流
使用輸出流輸出請求引數
conn.setDoOutput(true); os = conn.getOutputStream(); os.write("date=2016&number=00001".getBytes()); os.flush();
5、呼叫conn.getInputStream()傳送請求並獲取響應
is = conn.getInputStream()
6、解析響應資料,獲取響應文字
is轉換為String
在上一節的栗子上修改為POST
import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_connect; private EditText et_date; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setViews(); } private void setViews() { et_date = findViewById(R.id.et_date); btn_connect = findViewById(R.id.btn_connect); btn_connect.setOnClickListener(this); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.btn_connect: new Thread(){ @Override public void run() { try { findFlightsByPost(); } catch (IOException e) { e.printStackTrace(); } } }.start(); break; } } //使用Get方式傳送請求 獲取航班資料 private void findFlightsByPost() throws IOException { //1、URL URL url = new URL("http://192.168.3.25:8888/android_jsp/flight_index.jsp"); //2、HttpURLConnection HttpURLConnection conn = (HttpURLConnection)url.openConnection(); //3、setRequestMethod() setRequestProperty() conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); //4、doOutput(true) conn.setDoOutput(true); String d = et_date.getText().toString(); String param = "date="+d; OutputStream os = conn.getOutputStream(); os.write(param.getBytes("utf-8")); os.flush(); //5、conn.InputStream InputStream is = conn.getInputStream(); //6、is轉成String BufferedReader reader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = ""; while ((line=reader.readLine())!=null){ sb.append(line); } Log.d("info",sb.toString()); } }
Json
![這裡寫圖片描述](https://img-blog.csdn.net/20180730165358154?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTAzNTY3Njg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)栗子:登入
首先,檢視介面文件
增加許可權
<uses-permission android:name="android.permission.INTERNET" />
import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import org.json.JSONException; import org.json.JSONObject; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_add; private EditText et_number; private EditText et_password; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch (msg.what){ case ADD_CARD_SUCCESS: Toast.makeText(MainActivity.this,"登入成功",Toast.LENGTH_SHORT).show(); break; case ADD_CARD_FAIL: Toast.makeText(MainActivity.this,"登入失敗:"+msg.obj,Toast.LENGTH_SHORT).show(); break; } } }; public static final int ADD_CARD_SUCCESS = 1; public static final int ADD_CARD_FAIL = 2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setViews(); } private void setViews() { et_number = findViewById(R.id.et_number); et_password = findViewById(R.id.et_password); btn_add = findViewById(R.id.btn_add); btn_add.setOnClickListener(this); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.btn_add: new Thread(){ @Override public void run() { try { addCard(); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } }.start(); break; } } private void addCard() throws IOException, JSONException { //1、URL URL url = new URL("http://域名/site/login"); //2、HttpURLConnection HttpURLConnection conn = (HttpURLConnection)url.openConnection(); //3、setRequestMethod setRequestProperty() conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); //4、doOutPut conn.setDoInput(true); OutputStream os = conn.getOutputStream(); //5、構建引數 String user_name = et_number.getText().toString(); String password = et_password.getText().toString(); String param = "user_name="+user_name+"&password="+password; os.write(param.getBytes("utf-8")); os.flush(); //6、inputStream InputStream is = conn.getInputStream(); //7、is轉換成String BufferedReader reader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = ""; while ((line = reader.readLine())!=null){ sb.append(line); } String json = sb.toString(); //7、解析json JSONObject obj = new JSONObject(json); String res = obj.getString("code"); //8、發訊息給Handler if(res.equals("0")){ //成功 handler.sendEmptyMessage(ADD_CARD_SUCCESS); }else{ //失敗 Message msg = new Message(); msg.what = ADD_CARD_FAIL; msg.obj = obj.getString("message"); handler.sendMessage(msg); } } }