问题：
如何设置Spring数据JPA存储库？
卫弘义
又不想工作，我不知道是怎么回事。
日志包含以下消息：
org.springframework.beans.factory.UnsatisfiedDependencyExcep tion: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionExcept ion: No qualifying bean of type 'com.testjpaspring.repository.UserRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(req uired=true)}
将项目放在github https://github.com/romanych2021/testjpaspring上
package com.testjpaspring.repository;
import com.testjpaspring.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
User findByUsername (String username);
}
package com.testjpaspring.service;
import com.testjpaspring.model.User;
import org.springframework.stereotype.Service;
@Service
public interface UserService {
User findByUsername (String username);
}
package com.testjpaspring.service;
import com.testjpaspring.model.User;
import com.testjpaspring.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.transaction.Transactional;
@Service
@Transactional
public class UserServiceImpl implements UserService{
@Autowired
UserRepository userRepository;
@Override
public User findByUsername(String username) {
return userRepository.findByUsername(username);
}
}
package com.testjpaspring.controller;
import com.testjpaspring.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class MyController {
@Autowired
UserService userService;
@ResponseBody
@GetMapping(value = "/")
public String home () {
return userService.findByUsername("roma").getUsername();
}
}
package com.testjpaspring.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.JpaVendorAdapter;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import javax.sql.DataSource;
import java.util.Properties;
@EnableWebMvc
@Configuration
@EnableTransactionManagement
@ComponentScan({"com.testjpaspring.repository", "com.testjpaspring.service"})
public class RootConfig implements WebMvcConfigurer {
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource());
em.setPackagesToScan("com.testjpaspring.model");
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
em.setJpaProperties(additionalProperties());
return em;
}
@Bean
public DataSource dataSource(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/testjpaspring?serverTimezone=UTC&useSSL=false");
dataSource.setUsername( "root" );
dataSource.setPassword( "1234" );
return dataSource;
}
@Bean
public PlatformTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
return transactionManager;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){
return new PersistenceExceptionTranslationPostProcessor();
}
Properties additionalProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.hbm2ddl.auto", "create-drop");
properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL8Dialect");
return properties;
}
}
package com.testjpaspring.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
import java.util.Properties;
@Configuration
@EnableWebMvc
@ComponentScan({"com.testjpaspring.controller"})
public class Config implements WebMvcConfigurer{
@Bean
public FreeMarkerConfigurer freeMarkerConfigurer() {
FreeMarkerConfigurer configurer = new FreeMarkerConfigurer();
configurer.setTemplateLoaderPath("/WEB-INF/templates");
configurer.setDefaultEncoding("UTF-8");
Properties properties = new Properties();
properties.setProperty("default_encoding", "UTF-8");
configurer.setFreemarkerSettings(properties);
return configurer;
}
@Bean
public ViewResolver getViewResolver(){
FreeMarkerViewResolver viewResolver = new FreeMarkerViewResolver();
viewResolver.setSuffix(".ftl");
viewResolver.setContentType("text/html;charset=UTF-8");
viewResolver.setCache(false);
return viewResolver;
}
}
<?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>com.testjpaspring</groupId>
<artifactId>TestJpaSpring</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>${encoding}</encoding>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<failOnMissingWebXml>false</failOnMissingWebXml>
<java.version>1.8</java.version>
<encoding>UTF-8</encoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>5.2.9.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Spring Framework-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.3.4.RELEASE</version>
</dependency>
<!-- Hibernate-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.4.21.Final</version>
</dependency>
<!-- Остальные-->
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.30</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.21</version>
</dependency>
</dependencies>
</project>
共有1个答案
佘茂才
你失踪了
@EnableJpaRepositories(basePackages = "com.testjpaspring.repository")
在rootconfig类上。
事实上，类应该是这样的：
@Configuration
@ComponentScan("com.testjpaspring.service")
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.testjpaspring.repository")
public class RootConfig {
// Keep method as are
}
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