Spring Security基于json登录实现过程详解

以下是“Spring Security基于json登录实现过程详解”的完整攻略：

什么是Spring Security？

Spring Security是一个基于Spring框架的安全控制框架。它提供了一种在Web请求级别和方法级别上控制访问的方式，并为身份验证、授权和攻击保护提供了大量的支持和扩展。

Spring Security基于json登录实现的过程

步骤1：添加依赖

在pom.xml中添加以下依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

步骤2：创建Spring Security配置类

创建一个类，继承WebSecurityConfigurerAdapter，并添加@EnableWebSecurity注解。配置类中需要指定用户信息来源和访问权限。

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Autowired
    private UserDetailsServiceImpl userDetailsService;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class)
                .authorizeRequests()
                .antMatchers("/api/login").permitAll()
                .anyRequest().authenticated()
                .and().exceptionHandling().authenticationEntryPoint(new JwtAuthenticationEntryPoint())
                .and().sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers(HttpMethod.OPTIONS, "/**");
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder);
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

步骤3：实现用户验证逻辑

创建一个类，实现UserDetailsService接口，并重写loadUserByUsername方法，用于查询用户信息。

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserService userService;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("未找到该用户");
        }
        return new JwtUser(user);
    }
}

步骤4：实现密码加密逻辑

创建一个类，实现PasswordEncoder接口，并重写encode和matches方法，用于加密和验证密码。

@Component
public class BCryptPasswordEncoder implements PasswordEncoder {

    @Override
    public String encode(CharSequence rawPassword) {
        return new BCryptPasswordEncoder().encode(rawPassword);
    }

    @Override
    public boolean matches(CharSequence rawPassword, String encodedPassword) {
        return new BCryptPasswordEncoder().matches(rawPassword, encodedPassword);
    }
}

步骤5：实现JWT加密逻辑

创建一个类，实现TokenEnhancer接口，并重写enhance方法，用于对用户信息生成JWT Token。

@Component
public class JwtTokenEnhancer implements TokenEnhancer {

    @Autowired
    private UserService userService;

    @Override
    public OAuth2AccessToken enhance(OAuth2AccessToken accessToken, OAuth2Authentication authentication) {
        Map<String, Object> additionalInfo = new HashMap<>();
        User user = userService.findByUsername(authentication.getName());
        additionalInfo.put("username", user.getUsername());
        ((DefaultOAuth2AccessToken) accessToken).setAdditionalInformation(additionalInfo);
        return accessToken;
    }

}

示例一：登录成功返回JWT Token

创建一个Controller类，注入AuthenticationManager和JwtTokenUtil，并实现一个登录接口，用于输入用户名和密码并返回JWT Token。

@RestController
@RequestMapping("/api")
public class AuthenticationController {

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @PostMapping(value = "/login")
    public ResponseEntity<?> login(String username, String password) {
        UsernamePasswordAuthenticationToken upToken = new UsernamePasswordAuthenticationToken(username, password);
        // Perform the authentication
        final Authentication authentication = authenticationManager.authenticate(upToken);
        SecurityContextHolder.getContext().setAuthentication(authentication);
        // Generate jwt token
        final String token = jwtTokenUtil.generateToken(authentication);
        // Return jwt token
        return ResponseEntity.ok(new JwtAuthenticationResponse(token));
    }

}

示例二：JWT Token验证

创建一个Controller类，注入JwtTokenUtil，并实现一个需要登录验证的接口，用于验证JWT Token是否有效。

@RestController
@RequestMapping("/api")
public class UserController {

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @GetMapping(value = "/user")
    public ResponseEntity<?> getUser() {
        // Get username from jwt token
        String username = jwtTokenUtil.getUsernameFromToken(token);
        // Query user information from database
        User user = userService.findByUsername(username);
        // Return user information
        return ResponseEntity.ok(user);
    }

}

以上就是Spring Security基于json登录实现过程的详细攻略。