完善：完善用户登录 API，优化部分包结构（引入 MyBatis Plus、多数据源、P6Spy、Liquibase 等依赖，详情可见 README 介绍）

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/util/StreamUtils.java

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+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.common.util;
+
+import java.util.Collection;
+import java.util.Objects;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+import org.apache.commons.lang3.StringUtils;
+
+import cn.hutool.core.collection.CollUtil;
+
+/**
+ * Stream 工具类
+ *
+ * @author Charles7c
+ * @since 2022/12/22 19:51
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class StreamUtils {
+
+    /**
+     * 将集合中的指定字段使用分隔符拼接成字符串
+     *
+     * @param collection
+     *            集合
+     * @param function
+     *            字段方法
+     * @param delimiter
+     *            分隔符
+     * @param <E>
+     *            /
+     * @return 拼接结果
+     */
+    public static <E> String join(Collection<E> collection, Function<E, String> function, CharSequence delimiter) {
+        if (CollUtil.isEmpty(collection)) {
+            return StringUtils.EMPTY;
+        }
+        return collection.stream().map(function).filter(Objects::nonNull).collect(Collectors.joining(delimiter));
+    }
+}

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/util/helper/LoginHelper.java

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+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.common.util.helper;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+import cn.dev33.satoken.context.SaHolder;
+import cn.dev33.satoken.stp.StpUtil;
+
+import top.charles7c.cnadmin.common.model.dto.LoginUser;
+import top.charles7c.cnadmin.common.util.ExceptionUtils;
+
+/**
+ * 登录助手
+ *
+ * @author Charles7c
+ * @since 2022/12/24 12:58
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class LoginHelper {
+
+    private static final String LOGIN_USER_KEY = "LOGIN_USER";
+
+    /**
+     * 用户登录并缓存用户信息
+     *
+     * @param loginUser
+     *            登录用户信息
+     */
+    public static void login(LoginUser loginUser) {
+        SaHolder.getStorage().set(LOGIN_USER_KEY, loginUser);
+        StpUtil.login(loginUser.getUserId());
+        StpUtil.getTokenSession().set(LOGIN_USER_KEY, loginUser);
+    }
+
+    /**
+     * 获取登录用户信息
+     *
+     * @return /
+     */
+    public static LoginUser getLoginUser() {
+        LoginUser loginUser = (LoginUser)SaHolder.getStorage().get(LOGIN_USER_KEY);
+        if (loginUser != null) {
+            return loginUser;
+        }
+        try {
+            loginUser = (LoginUser)StpUtil.getTokenSession().get(LOGIN_USER_KEY);
+            SaHolder.getStorage().set(LOGIN_USER_KEY, loginUser);
+        } catch (Exception ignored) {
+        }
+        return loginUser;
+    }
+
+    /**
+     * 获取登录用户 ID
+     *
+     * @return /
+     */
+    public static Long getUserId() {
+        return ExceptionUtils.exToNull(() -> getLoginUser().getUserId());
+    }
+
+    /**
+     * 获取登录用户名
+     *
+     * @return /
+     */
+    public static String getUsername() {
+        return ExceptionUtils.exToNull(() -> getLoginUser().getUsername());
+    }
+
+    /**
+     * 获取登录用户昵称
+     *
+     * @return /
+     */
+    public static String getNickname() {
+        return ExceptionUtils.exToNull(() -> getLoginUser().getNickname());
+    }
+}