In this turtorial, I will show how to create a spring boot application with mongodb connection. It’s very basic and easy with using spring initializr.
1-) Go https://start.spring.io/ and create a spring boot application that has Spring Data MongoDB extension.
2-) Download the generated starter project, unzip it and open with your IDE.
3-) Go src/main/resources/application.properties file.
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spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.authentication-database=admin
spring.data.mongodb.database=test
spring.data.mongodb.username=mongoadmin
spring.data.mongodb.password=secret
Add this code to the file and change connection information by your connection details.
4-) Create a Student.java class.
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import org.springframework.data.annotation.Id;
public class Student {
@Id
public String id;
public String number;
public String firstName;
public String lastName;
public Student() {}
public Student(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return String.format(
"Student[id=%s, firstName='%s', lastName='%s']",
id, firstName, lastName);
}
}
5-) Create StudentRepository.java class
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public interface StudentRepository extends MongoRepository<Student, String> {
}
6-) Extend CommandLineRunner in Application class and override run method. Inject repository with @Autowired annotation. You can do your logic in the run method.
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@SpringBootApplication
public class MongodbtestApplication implements CommandLineRunner {
@Autowired
private StudentRepository repository;
public static void main(String[] args) {
SpringApplication.run(MongodbtestApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
repository.save(new Student("111", "Alice", "Smith"));
}
}