我将在Spring阅读有关宁静的Web服务的这本书。我决定放弃他们的工作,而使用Java配置文件。出于某种原因,切换到Java配置后,该服务将正确运行(在控制台窗口中),但是当我实际转到localhost上的端点时,会得到以下信息:
White label Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat Apr 23 20:48:25 PDT 2016 There was an unexpected error (type=Not Found, status=404). No message available
这是GET请求的响应:
{ "timestamp": 1461470029110, "status": 404, "error": "Not Found", "message": "No message available", "path": "/greeting" }
这个故事的下一章从我开始进入Spring网站http://spring.io/guides/gs/rest-service/的入门页面开始,我决定开始一个小项目,重新创建其基本教程。我将发布下面编写的代码供你查看。问题是,我有完全相同的问题。该服务正在运行,但是我无法访问端点。我不确定发生了什么,我也看到其他人也遇到类似的问题,但是我的答案没有得到应用/帮助。我敢肯定,我做错了什么,任何帮助将不胜感激。最后一条信息,如果有的话,我正在使用IntelliJ IDEA 15 CE作为我的IDE。
被击中的端点:
http:// localhost:8080 / greeting
My controller
@RestController public class GreetingController { private static final String template = "Hello, %s!"; private final AtomicLong counter = new AtomicLong(); @RequestMapping("/greeting") public Greeting greeting(@RequestParam(value = "name", defaultValue = "World")String name) { return new Greeting(counter.incrementAndGet(), String.format(template, name)); } }
我的资源表示课程
public class Greeting { private final long id; private final String content; public Greeting(long id, String content) { this.id = id; this.content = content; } public long getId() { return id; } public String getContent() { return content; } }
我的主
@SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
我的POM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.organization_name.webservices</groupId> <artifactId>helloworld</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.3.3.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <properties> <java.version>1.8</java.version> </properties> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> <repositories> <repository> <id>spring-releases</id> <url>https://repo.spring.io/libs-release</url> </repository> </repositories> <pluginRepositories> <pluginRepository> <id>spring-releases</id> <url>https://repo.spring.io/libs-release</url> </pluginRepository> </pluginRepositories>
命令行运行
mvn spring-boot:run
我从控制台获得的完整日志
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.3.3.RELEASE) 2016-04-23 20:47:53.153 INFO 7898 --- [ main] c.t.webservices.application.Application : Starting Application on Macintosh.local with PID 7898 (/Users/<my_user>/Downloads/B04788_Code/HelloWorld/target/classes started by <my_user> in /Users/<my_user>/Downloads/B04788_Code/HelloWorld) 2016-04-23 20:47:53.156 INFO 7898 --- [ main] c.t.webservices.application.Application : No active profile set, falling back to default profiles: default 2016-04-23 20:47:53.242 INFO 7898 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy 2016-04-23 20:47:54.084 INFO 7898 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: 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]] 2016-04-23 20:47:54.811 INFO 7898 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2016-04-23 20:47:54.840 INFO 7898 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat 2016-04-23 20:47:54.841 INFO 7898 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.32 2016-04-23 20:47:54.960 INFO 7898 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2016-04-23 20:47:54.960 INFO 7898 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1736 ms 2016-04-23 20:47:55.214 INFO 7898 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2016-04-23 20:47:55.218 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2016-04-23 20:47:55.545 INFO 7898 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy 2016-04-23 20:47:55.605 INFO 7898 --- [ 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) 2016-04-23 20:47:55.606 INFO 7898 --- [ 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,javax.servlet.http.HttpServletResponse) 2016-04-23 20:47:55.628 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2016-04-23 20:47:55.628 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2016-04-23 20:47:55.657 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2016-04-23 20:47:55.776 INFO 7898 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2016-04-23 20:47:55.848 INFO 7898 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2016-04-23 20:47:55.853 INFO 7898 --- [ main] c.t.webservices.application.Application : Started Application in 3.531 seconds (JVM running for 4.702) 2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet' 2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2016-04-23 20:48:19.533 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
GET请求后控制台更新
2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2016-04-23 20:48:19.533 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
停止后控制台
2016-04-23 20:53:24.494 INFO 7898 --- [ Thread-2] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy 2016-04-23 20:53:24.495 INFO 7898 --- [ Thread-2] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown Process finished with exit code 130
再次感谢你提供的任何帮助。我会随时向大家发布更新!
我相信你的问题与软件包有关。你的应用程序在中定义com.organization_name.webservices.application。我猜想你的其他课程在不是的子级的其他包中com.organization_name.webservices.application。Spring将自动加载相同软件包或子软件包中的控制器,例如:
com.organization_name.webservices.application
com.organization_name.webservices.application com.organization_name.webservices.application.controllers
但不是这样的包:
com.organization_name.webservices.controllers
你可以通过移动控制器(或应用程序)或将其添加ComponentScan到应用程序中来解决此问题:
@SpringBootApplication @ComponentScan(basePackageClasses=GreetingController.class) public class Application {
你应该在日志中看到以下内容:
Mapped "{[/greeting]}" onto public com.organization_name.webservices.xxx.Greeting com.organization_name.webservices.xxx.GreetingController.greeting(java.lang.String)