SpringSecurity实现登录功能实战！！！

实现思路

①自定义登录接口

调用ProviderManager的方法进行认证如果认证通过生成jwt

把用户信息存入redis中

②自定义UserDetailsService

在这个实现类中去查询数据库

注意配置passwordEncoder为BCryptPasswordEncoder

退出登录，删除redis中的数据

准备工作！！！

1、添加依赖！

2、工具类和相关配置类

FastJsonRedisSerializer


/**
 * Redis使用FastJson序列化
 * 
 * @author sg
 */
public class FastJsonRedisSerializer<T> implements RedisSerializer<T>
{

    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    static
    {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
    }

    public FastJsonRedisSerializer(Class<T> clazz)
    {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException
    {
        if (t == null)
        {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException
    {
        if (bytes == null || bytes.length <= 0)
        {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);

        return JSON.parseObject(str, clazz);
    }


    protected JavaType getJavaType(Class<?> clazz)
    {
        return TypeFactory.defaultInstance().constructType(clazz);
    }
}

RedisConfig

@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings(value = { "unchecked", "rawtypes" })
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory)
    {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);

        FastJsonRedisSerializer serializer = new FastJsonRedisSerializer(Object.class);

        // 使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(serializer);

        // Hash的key也采用StringRedisSerializer的序列化方式
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);

        template.afterPropertiesSet();
        return template;
    }
}

WebConfig ———跨域（可不设置）

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**") // 设置允许跨域的路径
                .allowedOriginPatterns("*") // 设置允许跨域请求的域名
                .allowCredentials(true) // 是否允许cookie
                .allowedMethods("GET", "POST", "DELETE", "PUT") // 设置允许的请求方式
                .allowedHeaders("*") // 设置允许的header属性
                .maxAge(3600); // 跨域允许时间
    }

    @Bean//使用@Bean注入fastJsonHttpMessageConvert
    public HttpMessageConverter fastJsonHttpMessageConverters() {
    //1.需要定义一个Convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new
                FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
        fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");

//        SerializeConfig.globalInstance.put(Long.class, ToStringSerializer.instance);

        fastJsonConfig.setSerializeConfig(SerializeConfig.globalInstance);
        fastConverter.setFastJsonConfig(fastJsonConfig);
        HttpMessageConverter<?> converter = fastConverter;
        return converter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(fastJsonHttpMessageConverters());
    }

}

WebUtils

public class WebUtils
{
    /**
     * 将字符串渲染到客户端
     * 
     * @param response 渲染对象
     * @param string 待渲染的字符串
     * @return null
     */
    public static void renderString(HttpServletResponse response, String string) {
        try
        {
            response.setStatus(200);
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }


    public static void setDownLoadHeader(String filename, ServletContext context, HttpServletResponse response) throws UnsupportedEncodingException {
        String mimeType = context.getMimeType(filename);//获取文件的mime类型
        response.setHeader("content-type",mimeType);
        String fname= URLEncoder.encode(filename,"UTF-8");
        response.setHeader("Content-disposition","attachment; filename="+fname);

//        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
//        response.setCharacterEncoding("utf-8");
    }
}

RedisCache


@SuppressWarnings(value = { "unchecked", "rawtypes" })
@Component
public class RedisCache
{
    @Autowired
    public RedisTemplate redisTemplate;

    /**
     * 缓存基本的对象，Integer、String、实体类等
     *
     * @param key 缓存的键值
     * @param value 缓存的值
     */
    public <T> void setCacheObject(final String key, final T value)
    {
        redisTemplate.opsForValue().set(key, value);
    }

    /**
     * 缓存基本的对象，Integer、String、实体类等
     *
     * @param key 缓存的键值
     * @param value 缓存的值
     * @param timeout 时间
     * @param timeUnit 时间颗粒度
     */
    public <T> void setCacheObject(final String key, final T value, final Integer timeout, final TimeUnit timeUnit)
    {
        redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
    }

    /**
     * 设置有效时间
     *
     * @param key Redis键
     * @param timeout 超时时间
     * @return true=设置成功；false=设置失败
     */
    public boolean expire(final String key, final long timeout)
    {
        return expire(key, timeout, TimeUnit.SECONDS);
    }

    /**
     * 设置有效时间
     *
     * @param key Redis键
     * @param timeout 超时时间
     * @param unit 时间单位
     * @return true=设置成功；false=设置失败
     */
    public boolean expire(final String key, final long timeout, final TimeUnit unit)
    {
        return redisTemplate.expire(key, timeout, unit);
    }

    /**
     * 获得缓存的基本对象。
     *
     * @param key 缓存键值
     * @return 缓存键值对应的数据
     */
    public <T> T getCacheObject(final String key)
    {
        ValueOperations<String, T> operation = redisTemplate.opsForValue();
        return operation.get(key);
    }

    /**
     * 删除单个对象
     *
     * @param key
     */
    public boolean deleteObject(final String key)
    {
        return redisTemplate.delete(key);
    }

    /**
     * 删除集合对象
     *
     * @param collection 多个对象
     * @return
     */
    public long deleteObject(final Collection collection)
    {
        return redisTemplate.delete(collection);
    }

    /**
     * 缓存List数据
     *
     * @param key 缓存的键值
     * @param dataList 待缓存的List数据
     * @return 缓存的对象
     */
    public <T> long setCacheList(final String key, final List<T> dataList)
    {
        Long count = redisTemplate.opsForList().rightPushAll(key, dataList);
        return count == null ? 0 : count;
    }

    /**
     * 获得缓存的list对象
     *
     * @param key 缓存的键值
     * @return 缓存键值对应的数据
     */
    public <T> List<T> getCacheList(final String key)
    {
        return redisTemplate.opsForList().range(key, 0, -1);
    }

    /**
     * 缓存Set
     *
     * @param key 缓存键值
     * @param dataSet 缓存的数据
     * @return 缓存数据的对象
     */
    public <T> BoundSetOperations<String, T> setCacheSet(final String key, final Set<T> dataSet)
    {
        BoundSetOperations<String, T> setOperation = redisTemplate.boundSetOps(key);
        Iterator<T> it = dataSet.iterator();
        while (it.hasNext())
        {
            setOperation.add(it.next());
        }
        return setOperation;
    }

    /**
     * 获得缓存的set
     *
     * @param key
     * @return
     */
    public <T> Set<T> getCacheSet(final String key)
    {
        return redisTemplate.opsForSet().members(key);
    }

    /**
     * 缓存Map
     *
     * @param key
     * @param dataMap
     */
    public <T> void setCacheMap(final String key, final Map<String, T> dataMap)
    {
        if (dataMap != null) {
            redisTemplate.opsForHash().putAll(key, dataMap);
        }
    }

    /**
     * 获得缓存的Map
     *
     * @param key
     * @return
     */
    public <T> Map<String, T> getCacheMap(final String key)
    {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * 往Hash中存入数据
     *
     * @param key Redis键
     * @param hKey Hash键
     * @param value 值
     */
    public <T> void setCacheMapValue(final String key, final String hKey, final T value)
    {
        redisTemplate.opsForHash().put(key, hKey, value);
    }

    /**
     * 获取Hash中的数据
     *
     * @param key Redis键
     * @param hKey Hash键
     * @return Hash中的对象
     */
    public <T> T getCacheMapValue(final String key, final String hKey)
    {
        HashOperations<String, String, T> opsForHash = redisTemplate.opsForHash();
        return opsForHash.get(key, hKey);
    }

    /**
     * 删除Hash中的数据
     * 
     * @param key
     * @param hkey
     */
    public void delCacheMapValue(final String key, final String hkey)
    {
        HashOperations hashOperations = redisTemplate.opsForHash();
        hashOperations.delete(key, hkey);
    }

    /**
     * 获取多个Hash中的数据
     *
     * @param key Redis键
     * @param hKeys Hash键集合
     * @return Hash对象集合
     */
    public <T> List<T> getMultiCacheMapValue(final String key, final Collection<Object> hKeys)
    {
        return redisTemplate.opsForHash().multiGet(key, hKeys);
    }

    /**
     * 获得缓存的基本对象列表
     *
     * @param pattern 字符串前缀
     * @return 对象列表
     */
    public Collection<String> keys(final String pattern)
    {
        return redisTemplate.keys(pattern);
    }
}

JwtUtil


/**
 * JWT工具类
 */
public class JwtUtil {

    //有效期为
    public static final Long JWT_TTL = 24*60 * 60 *1000L;// 60 * 60 *1000  一个小时
    //设置秘钥明文
    public static final String JWT_KEY = "sangeng";

    public static String getUUID(){
        String token = UUID.randomUUID().toString().replaceAll("-", "");
        return token;
    }
    
    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @return
     */
    public static String createJWT(String subject) {
        JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
        return builder.compact();
    }

    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @param ttlMillis token超时时间
     * @return
     */
    public static String createJWT(String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
        return builder.compact();
    }

    private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis, String uuid) {
        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
        SecretKey secretKey = generalKey();
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        if(ttlMillis==null){
            ttlMillis=JwtUtil.JWT_TTL;
        }
        long expMillis = nowMillis + ttlMillis;
        Date expDate = new Date(expMillis);
        return Jwts.builder()
                .setId(uuid)              //唯一的ID
                .setSubject(subject)   // 主题  可以是JSON数据
                .setIssuer("sg")     // 签发者
                .setIssuedAt(now)      // 签发时间
                .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
                .setExpiration(expDate);
    }

    /**
     * 创建token
     * @param id
     * @param subject
     * @param ttlMillis
     * @return
     */
    public static String createJWT(String id, String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
        return builder.compact();
    }

    public static void main(String[] args) throws Exception {
        String token = "eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiJjYWM2ZDVhZi1mNjVlLTQ0MDAtYjcxMi0zYWEwOGIyOTIwYjQiLCJzdWIiOiJzZyIsImlzcyI6InNnIiwiaWF0IjoxNjM4MTA2NzEyLCJleHAiOjE2MzgxMTAzMTJ9.JVsSbkP94wuczb4QryQbAke3ysBDIL5ou8fWsbt_ebg";
        Claims claims = parseJWT(token);
        System.out.println(claims);
    }

    /**
     * 生成加密后的秘钥 secretKey
     * @return
     */
    public static SecretKey generalKey() {
        byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
        return key;
    }
    
    /**
     * 解析
     *
     * @param jwt
     * @return
     * @throws Exception
     */
    public static Claims parseJWT(String jwt) throws Exception {
        SecretKey secretKey = generalKey();
        return Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(jwt)
                .getBody();
    }


}

代码实现：

自定义登录接口

BlogLoginController

@RestController
public class BlogLoginController {
    @Autowired
    private BlogLoginService blogLoginService;

    @PostMapping("/login")
    public ResponseResult login(@RequestBody User user){
        return blogLoginService.login(user);
    }

}

BlogLoginService

public interface BlogLoginService {
    ResponseResult login(User user);
}

新建配置类，SecurityConfig


@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

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

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/login").anonymous()
                .antMatchers("/link/getAllLink").authenticated()
                // 除上面外的所有请求全部不需要认证即可访问
                .anyRequest().permitAll();


         http.logout().disable();
         http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        //允许跨域
         http.cors();
    }

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

BlogLoginServiceImpl


@Service
public class BlogLoginServiceImpl implements BlogLoginService {

    @Autowired
    private AuthenticationManager authenticationManager;
    @Autowired
    private RedisCache redisCache;

    @Override
    public ResponseResult login(User user) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(user.getUserName(),user.getPassword());
        Authentication authenticate = authenticationManager.authenticate(authenticationToken);

        //判断是否认证通过
        if(Objects.isNull(authenticate)){
            throw new RuntimeException("用户名或密码错误");
        }
        //获取userId 生成token
        LoginUser loginUser = (LoginUser) authenticate.getPrincipal();
        String userId = loginUser.getUser().getId().toString();
        String jwt = JwtUtil.createJWT(userId);
        //把用户信息存入redis
        redisCache.setCacheObject("blogLogin:"+userId,loginUser);

        //把token和userInfo封装 返回
        //把User转换UserInfoVO
        UserInfoVO userInfoVO = BeanCopyUtils.copyBean(loginUser.getUser(), UserInfoVO.class);
        BlogUserLoginVO vo = new BlogUserLoginVO(jwt,userInfoVO);
        return ResponseResult.okResult(vo);
    }
}

新建UserDetailServiceImpl实现UserDetailService

自定义UserDetailsService

在这个实现类中去查询数据库

注意配置passwordEncoder为BCryptPasswordEncoder

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //根据用户名查询用户信息
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getUserName,username);
        User user = userMapper.selectOne(queryWrapper);
        //判断是否查到用户 如果没查到抛出异常
        if (Objects.isNull(user)){
            throw new RuntimeException("用户不存在");
        }
        //返回用户信息
        //TODO 查询权限信息封装
        return new LoginUser(user);
    }
}

LoginUser实现UserDetails

@Data
@AllArgsConstructor
@NoArgsConstructor
public class LoginUser implements UserDetails {

    private User user;

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }

    @Override
    public String getPassword() {
        return user.getPassword();
    }

    @Override
    public String getUsername() {
        return user.getUserName();
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

BlogUserLoginVo

@Data
@NoArgsConstructor
@AllArgsConstructor
public class BlogUserLoginVO {

    private String token;
    private UserInfoVO userInfo;
}

UserInfoVo

@Data
@Accessors(chain = true)
public class UserInfoVO {
    /**
     * 主键
     */
    private Long id;
    /**
     * 昵称
     */
    private String nickName;
    /**
     * 头像
     */
    private String avatar;
    private String sex;
    private String email;
}

登录校验过滤器代码实现

思路

定义 Jwt 认证过滤器

获取 token

解析 token 获取其中的 userid

从 redis 中获取用户信息

存入 SecurityContextHolder

JwtAuthenticationTokenFilter


@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {


    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        //获取请求头中的token
        String token = request.getHeader("token");
        if(!StringUtils.hasText(token)){
            //说明该接口不需要登录 直接放行
            filterChain.doFilter(request,response);
            return;
        }
        //解析获取userId
        Claims claims = null;
        try {
            claims = JwtUtil.parseJWT(token);
        } catch (Exception e) {
            e.printStackTrace();
            //token超时 token非法
            //响应告诉前端需要重新登录
            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;
        }
        String userId = claims.getSubject();
        //从redis中获取用户信息
        LoginUser loginUser = redisCache.getCacheObject("blogLogin:" + userId);
        //如果获取不到
        if(Objects.isNull(loginUser)){
            //说明登录过期 提示重新登录
            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;

        }
        //存入SecurityContextHolder
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser,null,null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);


        filterChain.doFilter(request,response);

    }
}

SecurityConfig



@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

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

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/login").anonymous()
                .antMatchers("/link/getAllLink").authenticated()
                // 除上面外的所有请求全部不需要认证即可访问
                .anyRequest().permitAll();


         http.logout().disable();
         http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        //允许跨域
         http.cors();
    }

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

认证授权失败处理

目前我们的项目在认证出错或者权限不足的时候响应回来的Json是Security的异常处理结果。但是这个

响应的格式肯定是不符合我们项目的接口规范的。所以需要自定义异常处理。

AuthenticationEntryPoint 认证失败处理器

/**
 * 认证失败处理器
 */
@Component
public class AuthenticationEntryPointImpl implements AuthenticationEntryPoint {

    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) throws IOException, ServletException {
        e.printStackTrace();

        //InsufficientAuthenticationException
        //BadCredentialsException
        ResponseResult result = null;
        if(e instanceof BadCredentialsException){
            result = ResponseResult.errorResult(AppHttpCodeEnum.LOGIN_ERROR.getCode(),e.getMessage());
        }else if (e instanceof InsufficientAuthenticationException){
            result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
        }else {
            result = ResponseResult.errorResult(AppHttpCodeEnum.SYSTEM_ERROR.getCode(),"认证或授权失败");

        }

        //响应给前端
        WebUtils.renderString(response, JSON.toJSONString(result));
    }
}

AccessDeniedHandler 授权失败处理器

/**
 * 授权失败处理器
 */
@Component
public class AccessDeniedHandlerImpl implements AccessDeniedHandler {

    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException e) throws IOException, ServletException {
        e.printStackTrace();
        ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NO_OPERATOR_AUTH);
        //响应给前端
        WebUtils.renderString(response, JSON.toJSONString(result));
    }
}

配置Security异常处理器


@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

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

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;
    @Autowired
    AuthenticationEntryPoint authenticationEntryPoint;
    @Autowired
    AccessDeniedHandler accessDeniedHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/login").anonymous()
                .antMatchers("/link/getAllLink").authenticated()
                // 除上面外的所有请求全部不需要认证即可访问
                .anyRequest().permitAll();

        //配置异常处理器
        http.exceptionHandling()
                .authenticationEntryPoint(authenticationEntryPoint)
                .accessDeniedHandler(accessDeniedHandler);

        http.logout().disable();
        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        //允许跨域
        http.cors();
    }

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

统一异常处理

实际我们在开发过程中可能需要做很多的判断校验，如果出现了非法情况我们是期望响应对应的提示的。但是如果我们每次都自己手动去处理就会非常麻烦。我们可以选择直接抛出异常的方式，然后对异常进行统一处理。把异常中的信息封装成ResponseResult响应给前端。

SystemException

public class SystemException extends RuntimeException {
    private int code;
    private String msg;

    public int getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }

    public SystemException(AppHttpCodeEnum httpCodeEnum) {
        super(httpCodeEnum.getMsg());
        this.code = httpCodeEnum.getCode();
        this.msg = httpCodeEnum.getMsg();
    }
}

GlobalExceptionHandler

@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {


    @ExceptionHandler(SystemException.class)
    public ResponseResult systemExceptionHandler(SystemException e){
        //打印异常信息
        log.error("出现了异常！{}",e);
        //从异常对象中获取提示信息封装发返回
        return ResponseResult.errorResult(e.getCode(),e.getMsg());
    }


    @ExceptionHandler(Exception.class)
    public ResponseResult exceptionHandler(Exception e){
        //打印异常信息
        log.error("出现了异常！{}",e);
        //从异常对象中获取提示信息封装发返回
        return ResponseResult.errorResult(AppHttpCodeEnum.SYSTEM_ERROR.getCode(),e.getMessage());
    }




}

退出登录接口

要实现的操作：

删除 redis 中的用户信息

BlogLoginController

    @PostMapping("/logout")
    public ResponseResult logout(){
        return blogLoginService.logout();
    }

BlogLoginService

  ResponseResult logout();

BlogLoginServiceImpl

    @Override
    public ResponseResult logout() {
        //获取token 解析获取userId
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        LoginUser loginUser = (LoginUser) authentication.getPrincipal();

        //获取userId
        Long userId = loginUser.getUser().getId();

        //删除redis中的用户信息
        redisCache.deleteObject("blogLogin:"+userId);
        return ResponseResult.okResult();
    }

SecurityConfig

要关闭默认的退出登录功能。并且要配置我们的退出登录接口需要认证才能访问

 @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/login").anonymous()
                .antMatchers("/logout").authenticated()
                .antMatchers("/link/getAllLink").authenticated()
                // 除上面外的所有请求全部不需要认证即可访问
                .anyRequest().permitAll();

        //配置异常处理器
        http.exceptionHandling()
                .authenticationEntryPoint(authenticationEntryPoint)
                .accessDeniedHandler(accessDeniedHandler);

        http.logout().disable();
        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        //允许跨域
        http.cors();
    }