Spring boot controller无法遇到错误404

Question

我正在使用Hibernate和MySQL构建此Spring Boot应用程序。我知道这是非常基本的，并且多次询问相同的问题，但是我无法弄清楚为什么控制器没有命中并给出404错误。如我所见，问题出在ComponentScan，其中@SpringBootApplication和@RestController驻留在一个程序包中，而@Repository和@Entity则位于另一个程序包中。当我将软件包包含为@ComponentScan(basePackages = "com.sample.user")时，项目将成功构建并运行，但未命中GET方法getUser()，也没有控制台输出错误。 GET方法仅在我省略控制器类中的@Autowired private UserRepository userRepository;以及应用程序类中的@ComponentScan。

Controller

package com.sample.rest.controller;

import com.sample.user.entity.User;
import com.sample.user.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping ("user")
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @GetMapping("/")
    public User getUser() {
        User user  = new User();
        user.setFirstName("Lady");
        user.setLastName("Gaga");
        user.setEmail("[email protected]");
        userRepository.save(user);
        return user;
    }
}

应用程序

package com.sample.rest;

import com.sample.rest.controller.UserController;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages = "com.sample.user")
public class RestServicesApplication {

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

}

存储库接口

package com.sample.user.repository;

import com.sample.user.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.stereotype.Repository;

@EnableJpaRepositories
@Repository
public interface UserRepository extends JpaRepository<User, Long> {}

实体

package com.sample.user.entity;

import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.*;

@Entity
@Table(name = "user")
@EntityListeners(AuditingEntityListener.class)
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(name = "first_name", nullable = false)
    private String firstName;

    @Column(name = "last_name", nullable = false)
    private String lastName;

    @Column(name = "email_address", nullable = false)
    private String email;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

浏览器页面https://ibb.co/KDsqLn3

Answer 1

使用@ComponentScan(basePackages = "com.sample.user")，您正在覆盖默认行为。

因此，请删除此包装并将包装放在您有@SpringBootApplication的包装下面，或将所有包装添加到@ComponentScan。

我建议不要使用默认的Spring Boot行为。

Answer 2

似乎您的请求映射在控制器级别设置不正确。插入您现在拥有的@RequestMapping ("user")，请将其设置为@RequestMapping ("/user") 现在请求GET“ {HOST} / user /”-不要忘了最后的/，因为您已经在getUser()端点的方法级别定义了该名称>