Android Retrofit 连接 JAVA 套接字

Question

如何使用 Retrofit 进行 Java 服务器套接字连接。 我的服务器有 JAVA 服务器套接字。 并想使用 Retrofit 从 android 发送请求。 如何通过 Java 套接字建立连接和发送接收数据

Answer 1

这是您可以通过 Retrofit 库连接到 Web 服务的方式。您可以使用此示例做任何您想做的事情：

1-首先你需要创建一个通信器类（做所有的发送接收过程）

public class Communicator {
    private static  final String TAG = "Communicator";
    private static final String SERVER_URL = "http://127.0.0.1/retrofit";

     public void loginPost(String username, String password){

        //Here a logging interceptor is created
        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        //The logging interceptor will be added to the http client
        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.addInterceptor(logging);

        //The Retrofit builder will have the client attached, in order to get connection logs
        Retrofit retrofit = new Retrofit.Builder()
                .client(httpClient.build())
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(SERVER_URL)
                .build(); Interface service = retrofit.create(Interface.class);

        Call<ServerResponse> call = service.post("login",username,password);

        call.enqueue(new Callback<ServerResponse>() {
            @Override
            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {
                BusProvider.getInstance().post(new ServerEvent(response.body()));
                Log.e(TAG,"Success");
            }

            @Override
            public void onFailure(Call<ServerResponse> call, Throwable t) {
                // handle execution failures like no internet connectivity
                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));
            }
        });
    }

    public void loginGet(String username, String password){
        //Here a logging interceptor is created
        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        //The logging interceptor will be added to the http client
        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.addInterceptor(logging);

        //The Retrofit builder will have the client attached, in order to get connection logs
        Retrofit retrofit = new Retrofit.Builder()
                .client(httpClient.build())
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(SERVER_URL)
                .build();

        Interface service = retrofit.create(Interface.class);

        Call<ServerResponse> call = service.get("login",username,password);

        call.enqueue(new Callback<ServerResponse>() {
            @Override
            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {
                BusProvider.getInstance().post(new ServerEvent(response.body()));
                Log.e(TAG,"Success");
            }

            @Override
            public void onFailure(Call<ServerResponse> call, Throwable t) {
                // handle execution failures like no internet connectivity
                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));
            }
        });
    }

这两种顶级方法都用于将用户名和密码发送到服务器进行身份验证。

2-Second 你应该在你的活动中使用通信器类：

public class MainActivity extends AppCompatActivity {

    private Communicator communicator;
    private String username, password;
    private EditText usernameET, passwordET;
    private Button loginButtonPost, loginButtonGet;
    private TextView information, extraInformation;
    private final static String TAG = "MainActivity";
    public static Bus bus;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        communicator = new Communicator();

        usernameET = (EditText)findViewById(R.id.usernameInput);
        passwordET = (EditText)findViewById(R.id.passwordInput);
        //This is used to hide the password's EditText characters. So we can avoid the different hint font.
      passwordET.setTransformationMethod(new PasswordTransformationMethod());

        loginButtonPost = (Button)findViewById(R.id.loginButtonPost);
        loginButtonPost.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                username = usernameET.getText().toString();
                password = passwordET.getText().toString();
                usePost(username, password);
            }
        });

        loginButtonGet = (Button)findViewById(R.id.loginButtonGet);
        loginButtonGet.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                username = usernameET.getText().toString();
                password = passwordET.getText().toString();
                useGet(username, password);
            }
        });

        information = (TextView)findViewById(R.id.information);
        extraInformation = (TextView)findViewById(R.id.extraInformation);
    }

    private void usePost(String username, String password){
        communicator.loginPost(username, password);
        }

    private void useGet(String username, String password){
        communicator.loginGet(username, password);
    }
}

在 onCreate 方法中，我们创建了一个通信器类的实例，并调用 useGet 和 usePost 方法将输入的用户名和密码发送到服务器。

3-不要忘记添加库依赖项（将此代码添加到您的 build.gradle(Module:app) 文件中：

compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'com.squareup:otto:1.3.8'
compile 'com.google.code.gson:gson:2.6.2'