RestController返回404（Spring Boot 2.3.7）

Question

我已经用RestContoller编写了Spring Boot应用程序。但是，当我在浏览器中击中URL时，我会遇到404错误。但是我不确定我在做什么错。一切似乎都是正确的。我的控制器类看起来像这样：

package com.gtt.wcas.device.root;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class DeviceConnectionController {

    Logger logger = LoggerFactory.getLogger(DeviceConnectionController.class.getName());

    .
    .
    .
    // Lots of variables
    .
    .
    .


    @RequestMapping(value = "/deviceConnection", method = RequestMethod.GET)
    @ResponseBody
    public ResponseEntity<String> deviceConnection(@RequestParam(value = "verify", defaultValue = "false") String verify) {

        .
        .
        //Method body.... lots of code...
        .
        .

        return new ResponseEntity<String>(HttpStatus.OK);
    }


    @RequestMapping(value = "/error", method = RequestMethod.GET)
    public ResponseEntity<String> error () {
        return new ResponseEntity<String>(HttpStatus.INTERNAL_SERVER_ERROR);
    }


    .
    .
    .
    // Lots of other helper methods.
    .
    .
    .
}

我的主类是这样的：

package com.gtt.wcas.device.root;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages = "com.gtt.wcas.device.details")
@ConfigurationPropertiesScan(basePackages = "com.gtt.wcas.device.configuration")
@EntityScan(basePackages = "com.gtt.wcas.device.db.jpa")
public class wcasDeviceConnectionApplication {

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

我的应用程序属性是：

#datasource configurations
spring.datasource.url=MY DB URL
spring.datasource.username=MY DB USERNAME
spring.datasource.password=MY DB PASSWORD
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect

# Enabling H2 Console
spring.h2.console.enabled=true
# Custom H2 Console URL
spring.h2.console.path=/h2-console

# DDL generation
spring.jpa.generate-ddl=true

logging.level.ch.qos.logback==DEBUG
spring.devtools.restart.enabled=true
debug=true

当我输入http：// localhost：8080/deviceconnection？verify = truifie = true上时，我会看到此信息在日志中：

2022-06-16 19:00:00.078 DEBUG 19444 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : GET "/deviceConnection?verify=true", parameters={masked}
2022-06-16 19:00:00.079 DEBUG 19444 --- [nio-8080-exec-4] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
2022-06-16 19:00:00.082 DEBUG 19444 --- [nio-8080-exec-4] o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
2022-06-16 19:00:00.082 DEBUG 19444 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND
2022-06-16 19:00:00.082 DEBUG 19444 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for GET "/error?verify=true", parameters={masked}
2022-06-16 19:00:00.083 DEBUG 19444 --- [nio-8080-exec-4] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#errorHtml(HttpServletRequest, HttpServletResponse)
2022-06-16 19:00:00.096 DEBUG 19444 --- [nio-8080-exec-4] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, text/html;q=0.8]
2022-06-16 19:00:00.097 DEBUG 19444 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 404

您能否让我知道我在做什么错。任何帮助都非常感谢。

Answer 1

您的控制器在软件包中com.gtt.wcas.device.root，但是您设置了@componentscan（basepackages =“ com.gtt.wcas.device.details”）。

您的控制器永远不会在春季拾取。将其移至另一个软件包，或更改组件扫描。

Answer 2

您可以在@componentscan中添加com.gtt.wcas.device.root吗？然后检查一下，

我已经通过Spring Boot观察到了这个问题，有时，如果您的控制器在不同的软件包（除源软件包除外）而没有明确扫描，则不会识别端点。

另外，由于@RestController已经具有该定义，因此您不需要@Responsebody在方法定义之上！