java - Spring 启动 : Cannot access REST Controller on localhost (404)

Question

我正在尝试调整 Spring Boot 网站上的 REST Controller 示例。不幸的是，当我尝试访问 localhost:8080/item URL 时出现以下错误。

{
  "timestamp": 1436442596410,
  "status": 404,
  "error": "Not Found",
  "message": "No message available",
  "path": "/item"
}

POM:

<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>SpringBootTest</groupId>
   <artifactId>SpringBootTest</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <properties>
      <javaVersion>1.8</javaVersion>
      <mainClassPackage>com.nice.application</mainClassPackage>
      <mainClass>${mainClassPackage}.InventoryApp</mainClass>
   </properties>

   <build>
      <plugins>
         <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
               <source>${javaVersion}</source>
               <target>${javaVersion}</target>
            </configuration>
         </plugin>

         <!-- Makes the Spring Boot app executable for a jar file. The additional configuration is needed for the cmd: mvn spring-boot:repackage 
            OR mvn spring-boot:run -->
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>

            <configuration>
               <mainClass>${mainClass}</mainClass>
               <layout>ZIP</layout>
            </configuration>
            <executions>
               <execution>
                  <goals>
                     <goal>repackage</goal>
                  </goals>
               </execution>
            </executions>
         </plugin>

         <!-- Create a jar with a manifest -->
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
               <archive>
                  <manifest>
                     <mainClass>${mainClass}</mainClass>
                  </manifest>
               </archive>
            </configuration>
         </plugin>
      </plugins>
   </build>

   <dependencyManagement>
      <dependencies>
         <dependency>
            <!-- Import dependency management from Spring Boot. This replaces the usage of the Spring Boot parent POM file. -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>1.2.5.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
         </dependency>

         <!-- more comfortable usage of several features when developing in an IDE. Developer tools are automatically disabled when 
            running a fully packaged application. If your application is launched using java -jar or if it’s started using a special classloader, 
            then it is considered a 'production application'. Applications that use spring-boot-devtools will automatically restart whenever files 
            on the classpath change. -->
         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
         </dependency>
      </dependencies>
   </dependencyManagement>

   <dependencies>
      <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>

      <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
         <version>15.0</version>
      </dependency>
   </dependencies>
</project>

入门应用:

package com.nice.application;
@SpringBootApplication // same as @Configuration @EnableAutoConfiguration @ComponentScan
public class InventoryApp {
   public static void main( String[] args ) {
      SpringApplication.run( InventoryApp.class, args );
   }
}

REST Controller :

package com.nice.controller; 
@RestController // shorthand for @Controller and @ResponseBody rolled together
public class ItemInventoryController {
   public ItemInventoryController() {
   }

   @RequestMapping( "/item" )
   public String getStockItem() {
      return "It's working...!";
   }

}

我正在使用 Maven 构建这个项目。以 jar (spring-boot:run) 和 IDE (Eclipse) 的形式启动它。

控制台日志:

2015-07-09 14:21:52.132  INFO 1204 --- [           main] c.b.i.p.s.e.i.a.InventoryApp          : Starting InventoryApp on 101010002016M with PID 1204 (C:\eclipse_workspace\SpringBootTest\target\classes started by MFE in C:\eclipse_workspace\SpringBootTest)
2015-07-09 14:21:52.165  INFO 1204 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7a3d45bd: startup date [Thu Jul 09 14:21:52 CEST 2015]; root of context hierarchy
2015-07-09 14:21:52.661  INFO 1204 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2015-07-09 14:21:53.430  INFO 1204 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2015-07-09 14:21:53.624  INFO 1204 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2015-07-09 14:21:53.625  INFO 1204 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.23
2015-07-09 14:21:53.731  INFO 1204 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2015-07-09 14:21:53.731  INFO 1204 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1569 ms
2015-07-09 14:21:54.281  INFO 1204 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2015-07-09 14:21:54.285  INFO 1204 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-07-09 14:21:54.285  INFO 1204 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2015-07-09 14:21:54.508  INFO 1204 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7a3d45bd: startup date [Thu Jul 09 14:21:52 CEST 2015]; root of context hierarchy
2015-07-09 14:21:54.573  INFO 1204 --- [           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.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2015-07-09 14:21:54.573  INFO 1204 --- [           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.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest)
2015-07-09 14:21:54.594  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.594  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.633  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.710  INFO 1204 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2015-07-09 14:21:54.793  INFO 1204 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2015-07-09 14:21:54.795  INFO 1204 --- [           main] c.b.i.p.s.e.i.a.InventoryApp          : Started InventoryApp in 2.885 seconds (JVM running for 3.227)
2015-07-09 14:22:10.911  INFO 1204 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2015-07-09 14:22:10.911  INFO 1204 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2015-07-09 14:22:10.926  INFO 1204 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 15 ms

到目前为止我已经尝试过:

• 使用应用程序名称 (InventoryApp) 访问 URL
• 将另一个 @RequestMapping("/") 放在 ItemInventoryController
的类级别

据我了解，使用 Spring Boot 时我不需要应用程序上下文。我说的对吗？

我还能做些什么来通过 URL 访问该方法？

Answer 1

尝试将以下内容添加到您的 InventoryApp 类中

@SpringBootApplication
@ComponentScan(basePackageClasses = ItemInventoryController.class)
public class InventoryApp {
...

spring-boot 会扫描 com.nice.application 下的包中的组件，所以如果你的 Controller 在 com.nice.controller 中，你需要扫描它明确的。