Copy Coding

               <dependency>

                   <groupId>com.google.firebase</groupId>

                   <artifactId>firebase-admin</artifactId>

                   <version>6.12.1</version>

                </dependency>

package com.copycoding.firebase;

public class Member {

        String id;

        String name;

        int age;

        String tel;

        public String getId() {

               return id;

        }

        public void setId(String id) {

               this.id = id;

        }

        public String getName() {

               return name;

        }

        public void setName(String name) {

               this.name = name;

        }

        public int getAge() {

               return age;

        }

        public void setAge(int age) {

               this.age = age;

        }

        public String getTel() {

               return tel;

        }

        public void setTel(String tel) {

               this.tel = tel;

        }

}

package com.copycoding.firebase;

public interface FirebaseService {

        public insertMember(Member member) throws Exception;

        public Member getMemberDetail(String id) throws Exception;

        public String updateMember(Member member) throws Exception;

        public string deleteMember(String id) throws Exception;

}

package com.copycoding.firebase;

import org.springframework.stereotype.Service;

import com.google.api.core.ApiFuture;

import com.google.cloud.firestore.DocumentReference;

import com.google.cloud.firestore.DocumentSnapshot;

import com.google.cloud.firestore.Firestore;

import com.google.cloud.firestore.WriteResult;

import com.google.firebase.cloud.FirestoreClient;

@Service

public class FirebaseServiceImpl implements FirebaseService {

        public static final String COLLECTION_NAME="member";

        @Override

        public String insertMember(Member member) throws Exception {

               Firestore firestore = FirestoreClient.getFirestore();

               ApiFuture<WriteResult> apiFuture = firestore.collection(COLLECTION_NAME).document(member.getId()).set(member);

               return apiFuture.get().getUpdateTime().toString();

        }

        @Override

        public Member getMemberDetail(String id) throws Exception {

               Firestore firestore = FirestoreClient.getFirestore();

               DocumentReference documentReference = firestore.collection(COLLECTION_NAME).document(id);

               ApiFuture<DocumentSnapshot> apiFuture = documentReference.get();

               DocumentSnapshot documentSnapshot = apiFuture.get();

               Member member = null;

               if(documentSnapshot.exists()) {

                       member = documentSnapshot.toObject(Member.class);

                       return member;

               } else {

                       return null;

               }

        }

        @Override

        public String updateMember(Member member) throws Exception {

               Firestore firestore = FirestoreClient.getFirestore();

               ApiFuture<WriteResult> apiFuture = firestore.collection(COLLECTION_NAME).document(member.getId()).set(member);

               return apiFuture.get().getUpdateTime().toString();

        }

        @Override

        public String deleteMember(String id) throws Exception {

               Firestore firestore = FirestoreClient.getFirestore();

               ApiFuture<WriteResult> apiFuture = firestore.collection(COLLECTION_NAME).document(id).delete();

               return "Document id :" + id + " delete";

        }

}

package com.copycoding.firebase;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class FirebaseController {

        @Autowired

        FirebaseService firebaseService;

        @GetMapping("/insertMember")

        public String insertMember(@RequestParam Member member) throws Exception {

               return firebaseService.insertMember(member);

        }

        @GetMapping("/getMemberDetail")

        public Member getMemberDetail(@RequestParam String id) throws Exception {

               return firebaseService.getMemberDetail(id);

        }

        @GetMapping("/updateMember")

        public String updateMember(@RequestParam Member member) throws Exception {

               return firebaseService.updateMember(member);

        }

        @GetMapping("/deleteMember")

        public String deleteMember(@RequestParam String id) throws Exception {

               return firebaseService.deleteMember(id);

        }

}

package com.copycoding.firebase;

import java.io.FileInputStream;

import javax.annotation.PostConstruct;

import org.springframework.stereotype.Service;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.firebase.FirebaseApp;

import com.google.firebase.FirebaseOptions;

@Service

public class FirebaseInitialize {

        @PostConstruct

    public void initialize() {

        try {

        FileInputStream serviceAccount =

                  new FileInputStream("./copycodingServiceAccount.json");

                FirebaseOptions options = new FirebaseOptions.Builder()

                  .setCredentials(GoogleCredentials.fromStream(serviceAccount))

                  .setDatabaseUrl("https://copycoding-bca04.firebaseio.com")

                  .build();

                FirebaseApp.initializeApp(options);

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

}