java - spring boot注释 Autowiring 的问题

Question

我遇到以下问题。我尝试使用 Hybernate 启动带有 DB2 数据库的 Spring Boot 应用程序。所以我创建了一个存储库并使用 @Autowired注释从数据库获取一些数据。问题是，当我运行该应用程序时，我收到以下错误:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field studenteRepository in com.ibm.snam.ai4legal.controller.HelloWorldController required a bean of type 'com.ibm.snam.ai4legal.repositories.StudenteRepository' that could not be found.


Action:

Consider defining a bean of type 'com.ibm.snam.ai4legal.repositories.StudenteRepository' in your configuration.

这是应用程序的类

应用程序类:

package com.ibm.snam.ai4legal.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(scanBasePackages = {"com.ibm"})
public class SBApplication {

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

存储库类:

package com.ibm.snam.ai4legal.repositories;

import org.springframework.data.repository.CrudRepository;

import com.ibm.snam.ai4legal.model.Studente;

public interface StudenteRepository extends CrudRepository<Studente, Integer>{

}

模型类:

package com.ibm.snam.ai4legal.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Studente{
    @Id
    @GeneratedValue
    private int id;
    private String nome;
    private String cognome;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getnome() {
        return nome;
    }
    public void setnome(String nome) {
        this.nome = nome;
    }
    public String getcognome() {
        return cognome;
    }
    public void setcognome(String cognome) {
        this.cognome = cognome;
    }
}

Controller 类:

package com.ibm.snam.ai4legal.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import com.ibm.snam.ai4legal.repositories.StudenteRepository;

@RestController
public class HelloWorldController {

    @Autowired
    StudenteRepository studenteRepository;

    @GetMapping(value = "/home")
    public ModelAndView helloworld() {

        ModelAndView hello = new ModelAndView("helloworld");
        return hello;
    }
}

这里是 pom.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>projects</groupId>
    <artifactId>springwebapp</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <failOnMissingWebXml>false</failOnMissingWebXml>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>com.ibm.db2.jcc</groupId>
            <artifactId>db2jcc4</artifactId>
            <version>4.26.14</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.6.1</version>
        </dependency>
    </dependencies>

<!--  <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>-->  

    <repositories>
        <repository>
            <id>repo</id>
            <url>file://${project.basedir}/lib</url>
        </repository>
    </repositories>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <packaging>war</packaging>
</project>

在互联网上我发现我应该插入 <context:annotation-config/>在某些配置文件中，但我不知道必须将其放在哪个文件中。有人可以帮忙吗？

Answer 1

您必须使用@ComponentScan注释。尝试下面的代码。

@ComponentScan({"com.ibm.*"})
@SpringBootApplication
public class SBApplication {

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

还要提到 StudenteRepository 类中的 @Repository 注释。