面對 osweb.servlet.PageNotFound：我的 spring 引導項目中的 GET / 問題沒有映射

Question

我正在嘗試在我的項目中使用 Spring Boot 來實現 REST 微服務。 我為登錄頁面創建了一個 controller 並創建了存儲庫。 但是在點擊 URL 時，我遇到了這個問題os.web.servlet.PageNotFound: No mapping for GET /

主Class

@ComponentScan(basePackages = {"com.springboot.controller.repository"})
@EntityScan(basePackages="com.springboot.controller.model")
@EnableJpaRepositories(basePackages="com.springboot.controller.repository")

@SpringBootApplication

public class CunsultustodayWebServicesApplication {

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

}

Controller

@RestController

@ComponentScan

@Controller

public class LoginController {

    @Autowired(required=true)
    private UserRepo userrepo;
    
    @RequestMapping("/")
    public String checkMVC()
    {
        return "Login";
    }
    
    @RequestMapping("/login")
    public String loginHome(@RequestParam("email") String email, @RequestParam("password") String password, Model model)
    {
        User u = null;
        try {
            u= userrepo.findByEmail(email);
        }
        catch(Exception ex) {
            System.out.println("User Not Found!!!");
        }
        if(u!=null) {
          model.addAttribute("email", email);
          return "HomePage";
        }
        return "Login";
    }
}

存儲庫

@Service("UserRepo")

public interface UserRepo extends JpaRepository<User,Integer> {

    User findByEmail(String email);

}

pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.springboot.controller</groupId>
    <artifactId>cunsultustoday-web-services</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cunsultustoday-web-services</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
           <groupId>org.apache.tomcat.embed</groupId>
           <artifactId>tomcat-embed-jasper</artifactId>
           <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>commons-configuration</groupId>
            <artifactId>commons-configuration</artifactId>
            <version>1.9</version>
        </dependency>
        <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>jstl</artifactId>
           <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>io.lettuce</groupId>
                        <artifactId>lettuce-core</artifactId>
                    </exclusion>
                </exclusions>    
            </dependency>
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
            </dependency>
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-webmvc</artifactId>
              </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

請幫我找到解決方案。 謝謝你

Answer 1

您的 controller 可能沒有被 ComponentScan 拾取，因為您僅限於 package 進行掃描。

嘗試這個：

// note @ComponentScan is removed as it is included already in @SpringBootApplication
@EnableJpaRepositories
@SpringBootApplication
public class CunsultustodayWebServicesApplication {
...

和這個：

// note @Controller and @CompnentScan are removed
@RestController
public class LoginController {