Spring-boot访问MongoDB

package hello;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.authentication.UserCredentials;
import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.MongoTemplate;

import com.mongodb.Mongo;
import com.mongodb.MongoClient;

@Configuration
public class MongoConfig extends AbstractMongoConfiguration {

@Bean
public Mongo mongo() throws Exception {
return new MongoClient();
}

@Bean
public MongoTemplate mongoTemplate() throws Exception {
UserCredentials user = new UserCredentials("scott", "tiger");
return new MongoTemplate(mongo(), "test1", user);
}

@Override
protected String getDatabaseName() {
// TODO Auto-generated method stub
return "test1";
}

}

package hello;

import org.springframework.data.annotation.Id;

public class Customer {

@Id
private String id;

private String firstName;
private String lastName;

public Customer() {}

public Customer(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}

@Override
public String toString() {
return String.format(
"Customer[id=%s, firstName='%s', lastName='%s']",
id, firstName, lastName);
}

}

package hello;

import java.util.List;

import org.springframework.data.mongodb.repository.MongoRepository;

public interface CustomerRepository extends MongoRepository<Customer, String> {

public Customer findByFirstName(String firstName);
public List<Customer> findByLastName(String lastName);

}

package hello;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Import;

@SpringBootApplication
@AutoConfigureBefore
@Import(MongoConfig.class)
public class Application implements CommandLineRunner {

@Autowired
private CustomerRepository repository;

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}

@Override
public void run(String... args) throws Exception {

repository.deleteAll();

// save a couple of customers
repository.save(new Customer("Alice", "Smith"));
repository.save(new Customer("Bob", "Smith"));

// fetch all customers
System.out.println("Customers found with findAll():");
System.out.println("-------------------------------");
for (Customer customer : repository.findAll()) {
System.out.println(customer);
}
System.out.println();

// fetch an individual customer
System.out.println("Customer found with findByFirstName('Alice'):");
System.out.println("--------------------------------");
System.out.println(repository.findByFirstName("Alice"));

System.out.println("Customers found with findByLastName('Smith'):");
System.out.println("--------------------------------");
for (Customer customer : repository.findByLastName("Smith")) {
System.out.println(customer);
}

}

}