休息控制器未在 Spring Boot 中映射答案

【问题标题】：Rest controller not mapping in spring boot休息控制器未在 Spring Boot 中映射
【发布时间】：2019-07-12 07:41:15
【问题描述】：

我的应用程序运行，但控制台中没有显示任何关于映射的内容。我的应用程序类文件在控制器上方，还添加了 @ComponentScan(basePackages : "com.org.name.controller") 以扫描控制器。控制台中仍然没有显示映射。我在控制器类中注释掉了@Autowired，因为我收到了以下错误：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-12 11:05:16.014 ERROR 14104 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Field userService in com.homzhub.lms.controller.UserController required a bean of type 'com.homzhub.lms.service.UserService' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.homzhub.lms.service.UserService' in your configuration.

主类：

package com.homzhub.lms;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages = {"com.homzhub.lms.controller"})
//@EnableJpaRepositories("repository")
//@EnableAutoConfiguration
public class LmsApplication{
    public static void main(String[] args){
        SpringApplication.run(LmsApplication.class, args);
    }
}

约会控制器：

package com.homzhub.lms.controller;

import java.security.Principal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.homzhub.lms.entity.Appointment;
import com.homzhub.lms.entity.User;
import com.homzhub.lms.service.AppointmentService;
import com.homzhub.lms.service.UserService;



@Controller
@RequestMapping(path = "/appointment")
public class AppointmentController {

   // @Autowired
    private AppointmentService appointmentService;

    //@Autowired
    private UserService userService;

    @RequestMapping(value = "/create", method = RequestMethod.GET)
    public void createAppointment(Model model) {
        Appointment appointment = new Appointment();
        model.addAttribute("appointment", appointment);
        model.addAttribute("dateString", "");
    }

    @RequestMapping(value = "/create", method = RequestMethod.POST)
    public String createAppointmentPost(@ModelAttribute("appointment") Appointment appointment, @ModelAttribute("dateString") String date, Model model, Principal principal) throws ParseException {

        SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd hh:mm");
        Date d1 = format1.parse(date);
        appointment.setDate(d1);

        User user = userService.findByUsername(principal.getName());
        appointment.setUser(user);

        appointmentService.createAppointment(appointment);

        return "redirect:/userFront";
    }
}

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
<!--        <version>1.5.21.RELEASE</version>  -->
        <version>2.1.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.homzhub</groupId>
    <artifactId>lms</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>lms</name>
    <description>Lead Management System</description>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
            </plugin>   
        </plugins>
    </build>

</project>

控制台输出。在控制器类中注释掉 @Autowired 后，应用程序运行但未完成映射：

2019-07-12 12:58:04.638  INFO 18828 --- [           main] com.homzhub.lms.LmsApplication           : Starting LmsApplication v0.0.1-SNAPSHOT on rms-Lenovo-ideapad-330-15IKB with PID 18828 (/home/rms/lms/target/lms-0.0.1-SNAPSHOT.jar started by rms in /home/rms/lms)
2019-07-12 12:58:04.644  INFO 18828 --- [           main] com.homzhub.lms.LmsApplication           : No active profile set, falling back to default profiles: default
2019-07-12 12:58:05.941  INFO 18828 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-07-12 12:58:06.161  INFO 18828 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 204ms. Found 13 repository interfaces.
2019-07-12 12:58:06.849  INFO 18828 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$d931452d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-07-12 12:58:07.301  INFO 18828 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-07-12 12:58:07.350  INFO 18828 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-07-12 12:58:07.350  INFO 18828 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.21]
2019-07-12 12:58:07.484  INFO 18828 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-07-12 12:58:07.484  INFO 18828 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2751 ms
2019-07-12 12:58:07.952  INFO 18828 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2019-07-12 12:58:08.286  INFO 18828 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2019-07-12 12:58:08.388  INFO 18828 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: default
    ...]
2019-07-12 12:58:08.519  INFO 18828 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.10.Final}
2019-07-12 12:58:08.521  INFO 18828 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2019-07-12 12:58:08.773  INFO 18828 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2019-07-12 12:58:09.175  INFO 18828 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2019-07-12 12:58:10.967  INFO 18828 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-07-12 12:58:12.284  INFO 18828 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-07-12 12:58:12.364  WARN 18828 --- [           main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2019-07-12 12:58:12.923  INFO 18828 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page template: index
2019-07-12 12:58:13.211  INFO 18828 --- [           main] .s.s.UserDetailsServiceAutoConfiguration : 

Using generated security password: f1e93a8f-d01a-4050-8724-87ff348fab02

2019-07-12 12:58:13.388  INFO 18828 --- [           main] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@1dcca8d3, org.springframework.security.web.context.SecurityContextPersistenceFilter@6daf2337, org.springframework.security.web.header.HeaderWriterFilter@70e3f36f, org.springframework.security.web.csrf.CsrfFilter@3c7cfcbb, org.springframework.security.web.authentication.logout.LogoutFilter@7d755813, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@4e25147a, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@60e5272, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter@5631962, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@56303475, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@250b236d, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@432034a, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@52a70627, org.springframework.security.web.session.SessionManagementFilter@23e44287, org.springframework.security.web.access.ExceptionTranslationFilter@1bfe3203, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@71870da7]
2019-07-12 12:58:13.517  INFO 18828 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2019-07-12 12:58:13.520  INFO 18828 --- [           main] com.homzhub.lms.LmsApplication           : Started LmsApplication in 9.518 seconds (JVM running for 10.158)

用户服务类：

package com.homzhub.lms.service;

import java.util.List;
import java.util.Set;
import org.springframework.stereotype.Service;
import com.homzhub.lms.entity.User;
import com.homzhub.lms.security.UserRole;
//@Service("userDetailsService")
@Service
public interface UserService{
    User findByUsername(String username);
    User findByEmail(String email);
 //   User findByPhoneNumber(String phoneNumber);
    boolean checkUserExists(String username, String email);
    boolean checkUsernameExists(String username);
    boolean checkEmailExists(String email);
    void save(User user);
    User createUser(User user, Set<UserRole> userRoles);
    User saveUser(User user);
    List<User> findUserList();
    void enableUser(String username);
    void disableUser(String username);
}

【问题讨论】：

您的服务在com.homzhub.lms.service 包下，因此您也必须将此包添加到组件扫描中。
@michalk 在 MainApplication 类中添加了 com.homzhub.lms.service 作为 ComponentScan，但仍然没有映射。控制台输出同上。

标签： java spring rest spring-boot

【解决方案1】：

如果还没有，您需要将UserService 定义为组件，或者更恰当地定义为服务。如果它已经是你必须映射它，考虑到 Spring 应该自己做这件事，这有点奇怪。

【讨论】：

我已经在上面添加了 UserService 类，请看一下。我已经在 UserService 类中有@Service 注释。

【解决方案2】：

您只在扫描com.homzhub.lms.controller，而UserService 不在 ComponentScan 下。您需要将服务包添加到 ComponentScan

@ComponentScan(basePackages = {"com.homzhub.lms"})

【讨论】：

我已经添加了@ComponentScan(basePackages = {"com.homzhub.lms"}) 但仍然没有映射。

【解决方案3】：

你的服务在com.homzhub.lms.service包下，所以你必须把这个包添加到@ComponentScan，所以Spring也会扫描这个包，并在那里找到标有原型的类：

@SpringBootApplication
@ComponentScan(basePackages = {"com.homzhub.lms.controller, "com.homzhub.lms.service"})
public class LmsApplication{
    public static void main(String[] args){
        SpringApplication.run(LmsApplication.class, args);
    }
}

但是我可以看到，您使用 @SpringBootApplication 注释的类已经在您的组件的所有包之上，因此您可以完全摆脱 @ComponentScan 注释。所以它会默认扫描嵌套包。

还要记住使用 Spring 原型注释来注释您的服务类，例如 @Service，以便组件扫描能够获取它们。

【讨论】：

我添加了：@ComponentScan(basePackages = {"com.homzhub.lms.controller"}) @ComponentScan(basePackages = {"com.homzhub.lms.service"}) 和我的服务类有 @Service 注释但仍然没有映射。
你已经用@Service 注释了接口。你应该实现这个接口并将这个注解放在实现之上。

【解决方案4】：

取消注释@Autowired 注释。将@Service 注释放在实现类而不是接口上，并确保您的实现类可以通过componentScan 发现。

另外，附带说明一下，Spring 将扫描您的主类（带有@SpringBootApplication 注释的类）的所有子包。因此，如果您想将实现保留在不同的包中，最好将com.homzhub.lms 之类的目录结构作为根目录，将com.homzhub.lms.controller 用于控制器com.homzhub.lms.service 用于服务，com.homzhub.lms.service.impl 用于服务。

如果您遵循此结构，则不需要componentScan。

【讨论】：