根据上面的代码要求，生成适配的后端代码，用eclipse，jps框架

基于您的需求，我将提供一个简化的Java Spring Boot后端代码示例，用于处理登录和注册功能。我们将使用Spring Security作为身份验证框架，Eclipse IDE和JPA（Java Persistence API）用于数据库操作。

首先，在Eclipse中创建一个新的Spring Boot Web应用：

1. 打开Eclipse，选择 "File" -> "New" -> "Other", 选择 "Spring Initializr"。
2. 在配置选项中，选中 "Web" 和 "Security"，点击 "Next"。
3. 输入项目名称、包名等信息，然后点击 "Finish" 创建项目。

现在，我们将编写关键代码：

**User实体类 (User.java):**

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String username;
    private String password;

    // getters and setters...
}

**UserRepository接口 (UserRepository.java):**

import org.springframework.data.jpa.repository.JpaRepository;

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

**UserService类 (UserService.java):**

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.stereotype.Service;

@Service
public class UserService implements UserDetailsService {

    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    // 用户注册方法略...
    public void register(User user) {
        // 添加到数据库...
    }

    // 用户登录方法略...
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 从数据库查询用户并返回Spring Security所需的UserDetails对象...
    }
}

**SecurityConfig类 (SecurityConfig.java):**

import org.springframework.context.annotation.Configuration;
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.servlet.configuration.WebMvcConfigurerAdapter;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebMvcConfigurerAdapter {

    @Autowired
    private UserService userService;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/register").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .loginPage("/login")
                .defaultSuccessUrl("/")
                .permitAll();
    }

    // 注入认证管理器构建器...
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userService);
    }
}

这是基本的架构，你可以根据需要添加更多的业务逻辑和验证。记得在Eclipse中运行`mvn spring-boot:run`启动服务器。