错误:中的字段dataSource需要一个类型为“javax.activation.dataSource”的bean,但找不到该bean
我对SPringBoot中的数据源有问题。我想使用JDBC并从数据源获取数据,但我得到错误: 说明: com.example.My.MyApplication中的字段dataSource需要找不到类型为“javax.activation.dataSource”的bean 行动: 考虑在配置中定义“javax.activation.DataSource”类型的bean 它是关于MyApplication.java中的数据源的错误:中的字段dataSource需要一个类型为“javax.activation.dataSource”的bean,但找不到该bean,java,spring-boot,jdbc,spring-jdbc,Java,Spring Boot,Jdbc,Spring Jdbc,我对SPringBoot中的数据源有问题。我想使用JDBC并从数据源获取数据,但我得到错误: 说明: com.example.My.MyApplication中的字段dataSource需要找不到类型为“javax.activation.dataSource”的bean 行动: 考虑在配置中定义“javax.activation.DataSource”类型的bean 它是关于MyApplication.java中的数据源的 package com.example.My; import com.
package com.example.My;
import com.example.My.dao.CustomerRepository;
import com.example.My.model.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import javax.activation.DataSource;
import java.util.List;
import static java.lang.System.exit;
@SpringBootApplication
public class MyApplication implements CommandLineRunner {
/**
*
*/
@Autowired
DataSource dataSource;
@Autowired
CustomerRepository customerRepository;
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
System.out.println("DATASOURCE = " + dataSource);
/// Get dbcp2 datasource settings
// BasicDataSource newds = (BasicDataSource) dataSource;
// System.out.println("BasicDataSource = " + newds.getInitialSize());
System.out.println("Display all customers...");
List<Customer> list = customerRepository.findAll();
list.forEach(x -> System.out.println(x));
System.out.println("Done!");
exit(0);
}
}
下面是代码
my schema.sql:
CREATE TABLE CUSTOMER(
ID NUMBER(10) NOT NULL,
NAME VARCHAR2(100) NOT NULL,
EMAIL VARCHAR2(100) NOT NULL,
CREATED_DATE DATE NOT NULL,
CONSTRAINT CUSTOMER_PK PRIMARY KEY (ID)
);
和data.sql
INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(1,
'mkyong','111@yahoo.com', TO_DATE('2017-02-11', 'yyyy-mm-dd'));
INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(2,
'yflow','222@yahoo.com', TO_DATE('2017-02-12', 'yyyy-mm-dd'));
INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(3,
'zilap','333@yahoo.com', TO_DATE('2017-02-13', 'yyyy-mm-dd'));
还有我的Customer.java
包com.example.My.model
import java.sql.Date;
public class Customer {
int id;
String name;
String email;
Date date;
public Customer(int id, String name, String email, Date date) {
this.id = id;
this.name = name;
this.email = email;
this.date = date;
}
}
CustomerRepository.java
import com.example.My.model.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public class CustomerRepository {
@Autowired
private JdbcTemplate jdbcTemplate;
// thanks Java 8, look the custom RowMapper
public List<Customer> findAll() {
List<Customer> result = jdbcTemplate.query(
"SELECT id, name, email, created_date FROM customer",
(rs, rowNum) -> new Customer(rs.getInt("id"),
rs.getString("name"), rs.getString("email"),
rs.getDate("created_date"))
);
return result;
}
}
MyApplication.java
package com.example.My;
import com.example.My.dao.CustomerRepository;
import com.example.My.model.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import javax.activation.DataSource;
import java.util.List;
import static java.lang.System.exit;
@SpringBootApplication
public class MyApplication implements CommandLineRunner {
/**
*
*/
@Autowired
DataSource dataSource;
@Autowired
CustomerRepository customerRepository;
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
System.out.println("DATASOURCE = " + dataSource);
/// Get dbcp2 datasource settings
// BasicDataSource newds = (BasicDataSource) dataSource;
// System.out.println("BasicDataSource = " + newds.getInitialSize());
System.out.println("Display all customers...");
List<Customer> list = customerRepository.findAll();
list.forEach(x -> System.out.println(x));
System.out.println("Done!");
exit(0);
}
}
您在MyApplication中导入了错误的数据源类型。您需要导入javax.sql.DataSource,而不是javax.activation.DataSource。谢谢,但是当我在javax.sql.DataSource上进行更改时,我得到的comunicat无法自动连接。有多个数据源类型的bean。我发现我应该在DataSource DataSource之前添加@QualifierdataSource;但是,我在创建名为“myApplication”的bean时出错:通过字段“dataSource”表示未满足的依赖关系;嵌套的异常是org.springframework。beans@Monika我建议您问一个新问题,但听起来您要么没有提供数据源配置,要么缺少实际激活数据源创建的依赖项。