我从Spring Boot开始，因为我正在学习教程。在本教程中，他们使用@RequestMapping和GET方法创建了控制器，一旦运行了应用程序，控制台就会显示如下：
s.w.s.m.m.a.RequestMappingHandlerMapping：映射“{[/ rooms]，方法 = GET}“到java.util.List＆lt; ..// more lines
但在我的情况下，我收到了一个错误：
s.w.s.m.m.a.RequestMappingHandlerMapping：将“{[/ error]}”映射到 上市 org.springframework.http.ResponseEntity＆GT; org.springframework.boot.autoconfigure.web.BasicErrorController.error（javax.servlet.http.HttpServletRequest）
为什么没有创建映射？
这是控制器：
package com.frankmoley.london.data.webservice;
import com.frankmoley.london.data.entity.Room;
import com.frankmoley.london.data.repository.RoomRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
@RestController
public class RoomController {
@Autowired
private RoomRepository repository;
@RequestMapping(value="/rooms", method= RequestMethod.GET)
List<Room> findAll(@RequestParam(required=false) String roomNumber){
List<Room> rooms = new ArrayList<>();
if(null==roomNumber){
Iterable<Room> results = this.repository.findAll();
results.forEach(room-> {rooms.add(room);});
}else{
Room room = this.repository.findByNumber(roomNumber);
if(null!=room) {
rooms.add(room);
}
}
return rooms;
}
}
实体：
package com.frankmoley.london.data.entity;
import javax.persistence.*;
@Entity
@Table(name = "ROOM")
public class Room {
@Id
@Column(name = "ROOM_ID")
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "NAME")
private String name;
@Column(name = "ROOM_NUMBER")
private String number;
@Column(name = "BED_INFO")
private String info;
//getters and setters
}
存储库：
package com.frankmoley.london.data.repository;
import com.frankmoley.london.data.entity.Room;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface RoomRepository extends CrudRepository<Room, Long> {
Room findByNumber(String number);
}
答案 0 :(得分：0)
以下是我的日志：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.8.RELEASE)
2019-09-09 21:41:37.074 INFO 25569 --- [ main] SpringRest.spring_rest.Application : Starting Application on prashant-ubuntu with PID 25569 (/home/prashant/workspace/egen/spring-rest/target/spring-rest-1.0.0.jar started by prashant in /home/prashant/workspace/egen/spring-rest/target)
2019-09-09 21:41:37.077 INFO 25569 --- [ main] SpringRest.spring_rest.Application : No active profile set, falling back to default profiles: default
2019-09-09 21:41:37.715 INFO 25569 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-09-09 21:41:37.796 INFO 25569 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 68ms. Found 1 repository interfaces.
2019-09-09 21:41:38.389 INFO 25569 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$d6eeeeff] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-09-09 21:41:38.696 INFO 25569 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-09-09 21:41:38.735 INFO 25569 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-09-09 21:41:38.735 INFO 25569 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.24]
2019-09-09 21:41:38.837 INFO 25569 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-09-09 21:41:38.837 INFO 25569 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1701 ms
2019-09-09 21:41:39.124 INFO 25569 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2019-09-09 21:41:39.415 INFO 25569 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2019-09-09 21:41:39.463 INFO 25569 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2019-09-09 21:41:39.525 INFO 25569 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.11.Final}
2019-09-09 21:41:39.526 INFO 25569 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2019-09-09 21:41:39.662 INFO 25569 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2019-09-09 21:41:39.866 INFO 25569 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2019-09-09 21:41:40.463 INFO 25569 --- [ main] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
2019-09-09 21:41:40.559 INFO 25569 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-09-09 21:41:41.041 INFO 25569 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-09-09 21:41:41.114 WARN 25569 --- [ 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
2019-09-09 21:41:41.380 INFO 25569 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-09-09 21:41:41.382 INFO 25569 --- [ main] SpringRest.spring_rest.Application : Started Application in 4.703 seconds (JVM running for 5.103)
2019-09-09 21:42:03.922 INFO 25569 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-09-09 21:42:03.922 INFO 25569 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-09-09 21:42:03.934 INFO 25569 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 12 ms
Hibernate: select employee0_.id as id1_0_, employee0_.email as email2_0_, employee0_.name as name3_0_, employee0_.salary as salary4_0_ from employee employee0_
您可以清楚地看到没有RequestMappingHandlerMapping的任何引用
但是该服务仍托管在“ /”上。
我使用了以下URL：
http://localhost:8080/employees/springEntityManagerJpa
对于不是spring boot的其他spring应用程序，URL如下：
http://localhost:8080/spring-rest/api/employees/springEntityManagerJpa
我认为您的情况与此类似。可能是服务已启动，但是您提供了错误的端点。只需删除上下文路径。就我而言，我删除了/spring-rest/api
希望这会有所帮助！