Android_서버통신(POST)_Android

실습

• LoginActivity.java

   import androidx.annotation.Nullable;
   import androidx.appcompat.app.AppCompatActivity;
  
   import android.content.Intent;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   import android.widget.EditText;
   import android.widget.Toast;
  
   import com.android.volley.AuthFailureError;
   import com.android.volley.Request;
   import com.android.volley.RequestQueue;
   import com.android.volley.Response;
   import com.android.volley.VolleyError;
   import com.android.volley.toolbox.StringRequest;
   import com.android.volley.toolbox.Volley;
  
   import java.util.HashMap;
   import java.util.Map;
  
   public class LoginActivity extends AppCompatActivity {
       Button btn_login, btn_new;
       EditText tvId, tvPw;
       RequestQueue queue;
       StringRequest request;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           btn_login = findViewById(R.id.btn_login);
           btn_new = findViewById(R.id.btn_new);
  
           tvId = findViewById(R.id.tvId);
           tvPw = findViewById(R.id.tvPw);
  
           queue = Volley.newRequestQueue(LoginActivity.this);
  
           btn_login.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View view) {
                   int method = Request.Method.POST;
                   String server_url = "http://172.30.1.36:8085/android/Login";
                   request = new StringRequest(
                           method,
                           server_url,
                           new Response.Listener<String>() {
                           @Override
                           public void onResponse(String response) {
                                   Toast.makeText(LoginActivity.this,
                                           "로그인 성공"+response,
                                           Toast.LENGTH_SHORT).show();
                               }
                           }, new Response.ErrorListener() {
                       @Override
                       public void onErrorResponse(VolleyError error) {
                           Toast.makeText(LoginActivity.this,
                                   "로그인 실패"+error.toString(),
                                   Toast.LENGTH_SHORT).show();
                       }
                   }
                   ){
                       @Nullable
                       @Override
                      protected Map<String, String> getParams() throws AuthFailureError {
                           Map<String,String> param = new HashMap<>();
                           param.put("id",tvId.getText().toString());
                           param.put("pw",tvPw.getText().toString());
  
                           return param;
                       }
                   };
  
                   queue.add(request);
  
               }
           });
  
           btn_new.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View view) {
                   Intent intent = new Intent(LoginActivity.this,JoinActivity.class);
                   startActivity(intent);
               }
           });
       }
   }

  저번 정리한 글을 참고하면 좋다.

  int method = Request.Method.POST;
  String server_url = "http://172.30.1.36:8085/android/Login";

  POST 방식으로 보내기 위해 Method를 설정한다.
  server_url은 뒤에 /Login의 위치에 어떤 값이 들어오냐에 따라 받는 곳이 달라진다.

   {
     @Nullable
     @Override
     protected Map<String, String> getParams() throws AuthFailureError {
          Map<String,String> param = new HashMap<>();
          param.put("id",tvId.getText().toString());
          param.put("pw",tvPw.getText().toString());
          return param;
     }
   }

  param.put("키", 값) : 데이터를 보내는데 키값을 정하여 데이터 값을 보낸다.
  

• activity_main.xml
  

• JoinActivity

  package com.example.ex0421;
  
  import androidx.annotation.Nullable;
  import androidx.appcompat.app.AppCompatActivity;
  
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.Toast;
  
  import com.android.volley.AuthFailureError;
  import com.android.volley.Request;
  import com.android.volley.RequestQueue;
  import com.android.volley.Response;
  import com.android.volley.VolleyError;
  import com.android.volley.toolbox.StringRequest;
  import com.android.volley.toolbox.Volley;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class JoinActivity extends AppCompatActivity {
      Button reg_join;
      EditText regId, regPw, regNick;
  
      RequestQueue queue;
      StringRequest request;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_join);
          reg_join = findViewById(R.id.join_join);
  
          regId = findViewById(R.id.join_id);
          regNick = findViewById(R.id.join_nick);
          regPw = findViewById(R.id.join_pw);
  
          queue = Volley.newRequestQueue(JoinActivity.this);
  
          reg_join.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  int method = Request.Method.POST;
                  String server_url ="http://172.30.1.36:8085/android/Join";
  
                  request = new StringRequest(
                          method,
                          server_url,
                          new Response.Listener<String>() {
                              @Override
                              public void onResponse(String response) {
                                  Toast.makeText(JoinActivity.this,
                                          "요청성공",
                                          Toast.LENGTH_SHORT).show();
                              }
                          }, new Response.ErrorListener() {
                      @Override
                      public void onErrorResponse(VolleyError error) {
                          Toast.makeText(JoinActivity.this,
                                  "요청실패"+error.toString(),
                                  Toast.LENGTH_SHORT).show();
                      }
                   }
                  ){
                      //POST 방식으로 데이터 전송할 때 사용하는 메소드
                      @Nullable
                      @Override
                      protected Map<String, String> getParams() throws AuthFailureError {
                          
                          Map<String,String> param = new HashMap<>();
                          param.put("id",regId.getText().toString());
                          param.put("pw",regPw.getText().toString());
                          param.put("nick",regNick.getText().toString());
  
                          return param;
                      }
                  };
  
                  queue.add(request);
  
              }
          });
      }
  }

  Map : Key와 value 형태(타입 변경 가능)로 데이터를 저장하는 자료구조

• activity_join.xml