SpringBoot实现登录接口！！！

下面是一个简单的Spring Boot登录接口示例，使用了Spring Security和JPA来处理用户认证。

首先，添加依赖到你的pom.xml：

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
</dependencies>

创建一个用户实体（User.java）：

import javax.persistence.*;
 
@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
 
    private String username;
 
    private String password;
 
    // 省略getter和setter
}

创建一个用户仓库（UserRepository.java）：

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
 
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsername(String username);
}

创建一个安全配置类（SecurityConfig.java）：

import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/", "/home").permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage("/login")
                .permitAll()
                .and()
            .logout()
                .permitAll();
    }
 
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
            .withUser("user").password("{noop}password").roles("USER");
    }
}

创建一个登录控制器（LoginController.java）：

import org.springframework.web.bind.annotation.PostMapping;
import org.springframewor