我是Spring的生态系统的新手。我坚持这种特殊情况。我的应用服务器以404响应所有API端点。
这是我的控制器
package com.example.controllers;
import com.example.models.Movie;
import com.example.services.MovieService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
import java.util.Optional;
@RestController
public class MovieController {
@Autowired
private MovieService movieService;
@RequestMapping(value = "/movies", method = RequestMethod.GET)
@ResponseBody
public List<Movie> getAllMovies(){
return movieService.getAllMovies();
}
@RequestMapping(value = "/movies", method = RequestMethod.POST)
@ResponseBody
public Movie addNewMovie(@RequestBody Movie movie){
System.out.println("Hello World");
return movieService.addMovie(movie);
}
@RequestMapping(value = "/movies/{id}", method = RequestMethod.GET)
@ResponseBody
public Optional<Movie> getMovieById(@PathVariable String id){
return movieService.getMovieById(id);
}
@RequestMapping(value = "/movies", method = RequestMethod.PUT)
@ResponseBody
public Movie updateMovie(@RequestBody Movie movie){
return movieService.updateMovie(movie);
}
@RequestMapping(value = "/movies/{id}", method = RequestMethod.DELETE)
public void removeMovieById(@PathVariable String id){
movieService.deleteMovie(id);
}
}
这是我的主要课程
package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@EnableAutoConfiguration
@ComponentScan
@SpringBootApplication
public class LearnSpringApplication{
public static void main(String[] args) {
SpringApplication.run(LearnSpringApplication.class, args);
}
}
我在localhost上运行它，端口是8080.我确实在此之前设置了一个小应用程序，并且按预期工作。但是，我猜它是因为控制器在不同的包中，因为在之前的应用程序中，主类和控制器在同一个包中。
修改这是我的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>com.example</groupId>
<artifactId>learn_spring</artifactId>
<version>0.0.1</version>
<packaging>jar</packaging>
<name>learn_spring</name>
<description>Project to learn Spring</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>10</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</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-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
编辑我的Spring-Boot启动日志
2018-05-03 17:16:44.937 INFO 14017 --- [ main] com.example.LearnSpringApplication : Starting LearnSpringApplication v0.0.1 on tfc with PID 14017 (/home/ayush/Workspace/learn_spring/target/learn_spring-0.0.1.jar started by ayush in /home/ayush/Workspace/learn_spring)
2018-05-03 17:16:44.940 INFO 14017 --- [ main] com.example.LearnSpringApplication : No active profile set, falling back to default profiles: default
2018-05-03 17:16:45.045 INFO 14017 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@6aba2b86: startup date [Thu May 03 17:16:45 IST 2018]; root of context hierarchy
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (jar:file:/home/ayush/Workspace/learn_spring/target/learn_spring-0.0.1.jar!/BOOT-INF/lib/spring-core-5.0.5.RELEASE.jar!/) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2018-05-03 17:16:46.113 INFO 14017 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-05-03 17:16:46.138 INFO 14017 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-05-03 17:16:46.139 INFO 14017 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.29
2018-05-03 17:16:46.151 INFO 14017 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib:/usr/lib64:/lib64:/lib:/usr/lib]
2018-05-03 17:16:46.218 INFO 14017 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-05-03 17:16:46.218 INFO 14017 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1186 ms
2018-05-03 17:16:46.336 INFO 14017 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-05-03 17:16:46.339 INFO 14017 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-05-03 17:16:46.340 INFO 14017 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-05-03 17:16:46.340 INFO 14017 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-05-03 17:16:46.340 INFO 14017 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-05-03 17:16:46.455 INFO 14017 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-03 17:16:46.720 INFO 14017 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@6aba2b86: startup date [Thu May 03 17:16:45 IST 2018]; root of context hierarchy
2018-05-03 17:16:46.786 INFO 14017 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-05-03 17:16:46.787 INFO 14017 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-05-03 17:16:46.817 INFO 14017 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-03 17:16:46.817 INFO 14017 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-03 17:16:47.060 INFO 14017 --- [ main] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2018-05-03 17:16:47.151 INFO 14017 --- [localhost:27017] org.mongodb.driver.connection : Opened connection [connectionId{localValue:1, serverValue:12}] to localhost:27017
2018-05-03 17:16:47.155 INFO 14017 --- [localhost:27017] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[3, 6, 3]}, minWireVersion=0, maxWireVersion=6, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=null, roundTripTimeNanos=2192957}
2018-05-03 17:16:47.323 INFO 14017 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-05-03 17:16:47.392 INFO 14017 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-05-03 17:16:47.395 INFO 14017 --- [ main] com.example.LearnSpringApplication : Started LearnSpringApplication in 2.89 seconds (JVM running for 3.296)
答案 0 :(得分：3)
有时是因为您的软件包结构。始终确保您的控制器与 @SpringBootApplication 类处于同一 package 或 sub-package 级别。
例如：
如果应用程序类位于com.ab，则控制器应位于com.ab或 com.abc 或 com.abcd 等。您不必总是添加 @ComponentScan 进行注册。
答案 1 :(得分：2)
您使用的是IntelliJ IDEA社区版，它不支持Spring Framework：
请参阅https://www.jetbrains.com/idea/features/editions_comparison_matrix.html以获取参考资料
由于您使用的是命令行，因此以上内容不适用。不过，我会把它留在这里作为参考。
在评论中，您指定在运行mvn clean package后跟java -jar target/whatever-your-project-name-is.jar时，会出现以下错误：
Field movieService in com.example.controllers.MovieController required a bean of type 'com.example.services.MovieService' that could not be found.
请确保：
MovieService services
@Service注释由于上述方法不起作用，请尝试替换
@ComponentScan
通过
@ComponentScan({"com.example.services", "com.example.controllers"})
在LearnSpringApplication课程中。
包括所有其他包含使用@Component，@Service，@Controller，@RestController或@Repository注释的类的包。
请注意，这是一种解决方法。通常情况下，单独@ComponentScan就足够了 - 或者在评论中提到的@DarrenForsy，即使@SpringBootApplication只适用于您的情况。