基本控制器配置在Spring Boot中不起作用

我正在使用Spring Boot創建示例項目，並試圖用簡單的String消息映射/。爲此，我使用了@Controller註釋。但由於某種原因，該映射不起作用。我還包括@ComponentScan和@EnableWebMvc沒有運氣。基本控制器配置在Spring Boot中不起作用

我已經使用maven spring-boot:run運行目標。上傳了項目https://github.com/tejact/SpringBasicsTreeHouse。

這裏是控制器：

package Controller; 

import org.springframework.stereotype.Component; 
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.ResponseBody; 

@Component 
@Controller 
public class GifController { 
    @RequestMapping("/") 
    @ResponseBody 
    public String listAllGifs() { 
     return "Listing all gifs : Madhu"; 
    }  
}

主要應用條目：

package com.teja; 

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.web.servlet.config.annotation.EnableWebMvc; 

@EnableAutoConfiguration 
@ComponentScan 
@EnableWebMvc 
public class AppConfig {  
    public static void main(String args[]) { 
     SpringApplication.run(AppConfig.class, args); 
    } 
}

春季啓動日誌：

[INFO] Scanning for projects... 
[INFO]                   
[INFO] ------------------------------------------------------------------------ 
[INFO] Building SpingBasicsTreeHouse 0.0.1-SNAPSHOT 
[INFO] ------------------------------------------------------------------------ 
[INFO] 
[INFO] >>> spring-boot-maven-plugin:1.4.0.RELEASE:run (default-cli) > test-compile @ SpingBasicsTreeHouse >>> 
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ SpingBasicsTreeHouse --- 
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! 
[INFO] Copying 0 resource 
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ SpingBasicsTreeHouse --- 
[INFO] Changes detected - recompiling the module! 
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent! 
[INFO] Compiling 2 source files to C:\Users\Teja\git\SpringBasicsTreeHOuse\SpingBasicsTreeHouse\target\classes 
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ SpingBasicsTreeHouse --- 
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! 
[INFO] Copying 0 resource 
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ SpingBasicsTreeHouse --- 
[INFO] Nothing to compile - all classes are up to date 
[INFO] 
[INFO] <<< spring-boot-maven-plugin:1.4.0.RELEASE:run (default-cli) < test-compile @ SpingBasicsTreeHouse <<< 
[INFO] 
[INFO] --- spring-boot-maven-plugin:1.4.0.RELEASE:run (default-cli) @ SpingBasicsTreeHouse --- 

    . ____   _   __ _ _ 
/\\/___'_ __ _ _(_)_ __ __ _ \ \ \ \ 
(()\___ | '_ | '_| | '_ \/ _` | \ \ \ \ 
\\/ ___)| |_)| | | | | || (_| | )))) 
    ' |____| .__|_| |_|_| |_\__, |//// 
=========|_|==============|___/=/_/_/_/ 
:: Spring Boot ::  (v1.4.0.RELEASE) 

2016-07-31 13:18:24.593 INFO 11084 --- [   main] com.teja.AppConfig      : Starting AppConfig on Teja-PC with PID 11084 (C:\Users\Teja\git\SpringBasicsTreeHOuse\SpingBasicsTreeHouse\target\classes started by Teja in C:\Users\Teja\git\SpringBasicsTreeHOuse\SpingBasicsTreeHouse) 
2016-07-31 13:18:24.598 INFO 11084 --- [   main] com.teja.AppConfig      : No active profile set, falling back to default profiles: default 
2016-07-31 13:18:24.712 INFO 11084 --- [   main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot[email protected]ae4a4a3: startup date [Sun Jul 31 13:18:24 EDT 2016]; root of context hierarchy 
2016-07-31 13:18:26.868 INFO 11084 --- [   main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 
2016-07-31 13:18:26.885 INFO 11084 --- [   main] o.apache.catalina.core.StandardService : Starting service Tomcat 
2016-07-31 13:18:26.886 INFO 11084 --- [   main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.4 
2016-07-31 13:18:27.002 INFO 11084 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]  : Initializing Spring embedded WebApplicationContext 
2016-07-31 13:18:27.003 INFO 11084 --- [ost-startStop-1] o.s.web.context.ContextLoader   : Root WebApplicationContext: initialization completed in 2297 ms 
2016-07-31 13:18:27.184 INFO 11084 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 
2016-07-31 13:18:27.191 INFO 11084 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 
2016-07-31 13:18:27.434 INFO 11084 --- [   main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot[email protected]ae4a4a3: startup date [Sun Jul 31 13:18:24 EDT 2016]; root of context hierarchy 
2016-07-31 13:18:27.582 INFO 11084 --- [   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) 
2016-07-31 13:18:27.587 INFO 11084 --- [   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) 
2016-07-31 13:18:28.004 INFO 11084 --- [   main] o.s.j.e.a.AnnotationMBeanExporter  : Registering beans for JMX exposure on startup 
2016-07-31 13:18:28.082 INFO 11084 --- [   main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 
2016-07-31 13:18:28.087 INFO 11084 --- [   main] com.teja.AppConfig      : Started AppConfig in 4.278 seconds (JVM running for 12.677)

而且我pom.xml如下所示：

<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>TreeHouse</groupId> 
    <artifactId>SpingBasicsTreeHouse</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 

    <dependencies> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-web</artifactId> 
     <version>1.4.0.RELEASE</version> 
    </dependency> 
</dependencies> 

<build> 
     <plugins> 
      <plugin> 
       <groupId>org.springframework.boot</groupId> 
       <artifactId>spring-boot-maven-plugin</artifactId> 
       <version>1.4.0.RELEASE</version> 
       <executions> 
        <execution> 
         <goals> 
          <goal>repackage</goal> 
         </goals> 
        </execution> 
       </executions> 
      </plugin> 
     </plugins> 
    </build> 
</project>

來源

2016-07-31 mc20

默認@ComponentScan掃描當前包和所有子包。

在你的情況AppConfig類在包com.teja和GifController在Controller包，所以它不被掃描。

移動GifController到com.teja.controller例如或com.teja的任何其他子包，它將工作。

通常我會將引導類和所有配置類保存在包名爲<com|org|etc>.<myCompany>.<myProject>的包中，然後創建其他包作爲此包的子包。

你也不需要兩個@Component和@Controller。刪除@Component - @Controller已經繼承@Component。

來源

2016-07-31 18:04:46

謝謝。晶瑩剔透 – mc20

基本控制器配置在Spring Boot中不起作用

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