Question

在android studio中，如何从与oracle数据库连接的servlet程序中获取其余api web服务url链接，以及如何为该程序连接oracle数据库

Answer 1

这很容易，您可以使用HttpConnection或诸如Retrofit之类的第三方库。我建议使用翻新。那太好了，很容易。但是，您遇到的困难是创建RESTful API。因此，首先您需要学习使用Java创建RESTful API。我想您应该使用Framework Spring。

在此处详细了解：https://spring.io/guides/gs/rest-service/

一旦拥有了所有需要的RESTful API。您可以在自己的android项目中非常轻松地使用它。

首先创建您的API接口

public interface Api {


    @FormUrlEncoded
    @POST("createuser")
    Call<DefaultResponse> createUser(
            @Field("email") String email,
            @Field("password") String password,
            @Field("name") String name,
            @Field("school") String school
    );

    @FormUrlEncoded
    @POST("userlogin")
    Call<LoginResponse> userLogin(
            @Field("email") String email,
            @Field("password") String password
    );

    @GET("allusers")
    Call<UsersResponse> getUsers();

    @FormUrlEncoded
    @PUT("updateuser/{id}")
    Call<LoginResponse> updateUser(
            @Path("id") int id,
            @Field("email") String email,
            @Field("name") String name,
            @Field("school") String school
    );

    @FormUrlEncoded
    @PUT("updatepassword")
    Call<DefaultResponse> updatePassword(
            @Field("currentpassword") String currentpassword,
            @Field("newpassword") String newpassword,
            @Field("email") String email
    );

    @DELETE("deleteuser/{id}")
    Call<DefaultResponse> deleteUser(@Path("id") int id);

}

创建要获取API实例的类。

public class RetrofitClient {

    private static final String AUTH = "Basic " + Base64.encodeToString(("belalkhan:123456").getBytes(), Base64.NO_WRAP);

    private static final String BASE_URL = "http://simplifiedlabs.xyz/MyApi/public/";
    private static RetrofitClient mInstance;
    private Retrofit retrofit;


    private RetrofitClient() {

        retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

    public static synchronized RetrofitClient getInstance() {
        if (mInstance == null) {
            mInstance = new RetrofitClient();
        }
        return mInstance;
    }

    public Api getApi() {
        return retrofit.create(Api.class);
    }
}

然后使用此类执行API调用。

 Call<LoginResponse> call = RetrofitClient
                .getInstance().getApi().userLogin(email, password);

        call.enqueue(new Callback<LoginResponse>() {
            @Override
            public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
                LoginResponse loginResponse = response.body();

                if (!loginResponse.isError()) {

                    SharedPrefManager.getInstance(LoginActivity.this)
                            .saveUser(loginResponse.getUser());

                    Intent intent = new Intent(LoginActivity.this, ProfileActivity.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    startActivity(intent);


                } else {
                    Toast.makeText(LoginActivity.this, loginResponse.getMessage(), Toast.LENGTH_LONG).show();
                }
            }

            @Override
            public void onFailure(Call<LoginResponse> call, Throwable t) {

            }
        });

您需要互联网许可才能执行此操作。

如果您是初学者，那么这些步骤可能会使您感到困惑。因此，建议您在YouTube上观看此 Complete Retrofit Course 。本课程涵盖了从构建RESTful API到在Android项目中使用它的所有内容。每件事都包含所有细节的逐步说明。希望这会有所帮助。

Answer 2

package com.javacodegeeks.snippets.core;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectToOracle {

   public static void main(String[] args) {

    Connection connection = null;
    try {

  // Load the Oracle JDBC driver

  String driverName = "oracle.jdbc.driver.OracleDriver";

  Class.forName(driverName);


//Create a connection to the database

  String serverName = "localhost";

  String serverPort = "1521";

  String sid = "mySchema";

  String url = "jdbc:oracle:thin:@" + serverName + ":" + serverPort + ":" + sid;

  String username = "username";

  String password = "password";

  connection = DriverManager.getConnection(url, username, password);



  System.out.println("Successfully Connected to the database!");


    } catch (ClassNotFoundException e) {

   System.out.println("Could not find the database driver " + e.getMessage());
    } catch (SQLException e) {

  System.out.println("Could not connect to the database " + e.getMessage());
  }

 }

}

如何在android中将oracle数据库与rest api连接起来？

2 个答案: