弹簧启动控制器未映射

java spring

2022-09-01 00:16:56

我使用STS，现在我正在使用IntelliJ Ultimate Edition，但我仍然得到相同的输出。我的控制器未映射，因此显示404错误。我对Spring Framework完全陌生。

演示应用程序.java

package com.webservice.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

你好控制器.java

package com.webservice.demo;


import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String sayHello(){
        return "Hey";
    }

}

控制台输出

com.webservice.demo.DemoApplication      : Starting DemoApplication on XFT000159365001 with PID 11708 (started by Mayank Khursija in C:\Users\Mayank Khursija\IdeaProjects\demo)
    2017-07-19 12:59:46.150  INFO 11708 --- [           main] com.webservice.demo.DemoApplication      : No active profile set, falling back to default profiles: default
    2017-07-19 12:59:46.218  INFO 11708 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@238e3f: startup date [Wed Jul 19 12:59:46 IST 2017]; root of context hierarchy
    2017-07-19 12:59:47.821  INFO 11708 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8211 (http)
    2017-07-19 12:59:47.832  INFO 11708 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2017-07-19 12:59:47.832  INFO 11708 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.15
    2017-07-19 12:59:47.944  INFO 11708 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2017-07-19 12:59:47.944  INFO 11708 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1728 ms
    2017-07-19 12:59:47.987  INFO 11708 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
    2017-07-19 12:59:48.510  INFO 11708 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
    2017-07-19 12:59:48.519  INFO 11708 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 0
    2017-07-19 12:59:48.634  INFO 11708 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8211 (http)
    2017-07-19 12:59:48.638  INFO 11708 --- [           main] com.webservice.demo.DemoApplication      : Started DemoApplication in 2.869 seconds (JVM running for 3.44)

答案 1

我也遇到了类似的问题，并且能够通过更正以下源包结构最终解决它

组件扫描不会扫描控制器类。您的 Controller 类必须嵌套在包层次结构的下面，以指向具有 main（）方法的主 SpringApplication 类，然后只有它才会被扫描，并且您还应该在 Spring Boot 开始时看到控制台输出中列出的 RequestMappings。

已在 Spring Boot 1.5.8.RELEASE 上进行测试

但是，如果您更喜欢使用自己的包装结构，则始终可以使用注释来定义要扫描的内容。@ComponentScanbasePackages

答案 2

因为和在同一个包
中在根包中找到主应用程序类高于其他类
查看 Spring Boot 文档查找主应用程序类DemoApplication.classHelloController.class

使用根包还允许组件扫描仅应用于项目。

例如，在您的情况下，它如下所示：

com.webservice.demo.DemoApplication
com.webservice.demo.controller.HelloController