feat: 👍 装饰器模式

src/main/java/cc/niushuai/demo/designpattern/creatormodel/decorator/LoginService.java

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+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator;
+
+import cc.niushuai.demo.designpattern.creatormodel.decorator.entity.LoginUser;
+import cc.niushuai.demo.designpattern.creatormodel.decorator.filter.LoginFilter;
+import cc.niushuai.demo.designpattern.creatormodel.decorator.filter.LoginFilterDecorator;
+
+/**
+ * 登陆校验逻辑
+ *
+ * @author niushuai233
+ * @date 2024/1/29 10:40
+ * @since 0.0.1
+ */
+public class LoginService {
+
+    public void login(String username, String password) {
+        login(username, password, null);
+    }
+    public void login(String username, String password, String code) {
+
+        LoginUser loginUser = new LoginUser(username, password, code);
+
+        LoginFilterDecorator filter = new LoginFilterDecorator();
+        if (filter.filter(loginUser)) {
+            System.out.println(username + " login success!");
+            return;
+        }
+
+        System.err.println(username + " login failed!");
+    }
+}

src/main/java/cc/niushuai/demo/designpattern/creatormodel/decorator/entity/LoginUser.java

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+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 登陆用户
+ *
+ * @author niushuai233
+ * @date 2024/1/10 16:56
+ * @since 0.0.1
+ */
+@Data
+public class LoginUser {
+    private String username;
+    private String password;
+
+    private String code;
+
+    public LoginUser() {
+    }
+
+    public LoginUser(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+
+    public LoginUser(String username, String password, String code) {
+        this.username = username;
+        this.password = password;
+        this.code = code;
+    }
+}

src/main/java/cc/niushuai/demo/designpattern/creatormodel/decorator/filter/LoginFilter.java

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+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator.filter;
+
+import cc.niushuai.demo.designpattern.creatormodel.decorator.entity.LoginUser;
+
+/**
+ * 登陆过滤器
+ *
+ * @author niushuai233
+ * @date 2024/1/29 10:40
+ * @since 0.0.1
+ */
+public class LoginFilter {
+
+    public boolean filter(LoginUser user) {
+
+        if ("zh".equals(user.getUsername()) && "pass".equals(user.getPassword())) {
+            return true;
+        }
+
+        System.err.println("==> username or password is wrong");
+        return false;
+    }
+}

src/main/java/cc/niushuai/demo/designpattern/creatormodel/decorator/filter/LoginFilterDecorator.java

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+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator.filter;
+
+import cc.niushuai.demo.designpattern.creatormodel.decorator.entity.LoginUser;
+
+/**
+ * login filter decorator
+ *
+ * @author niushuai233
+ * @date 2024/1/29 11:04
+ * @since 0.0.1
+ */
+public class LoginFilterDecorator extends LoginFilter {
+
+    @Override
+    public boolean filter(LoginUser user) {
+
+        if (!"9527".equals(user.getCode())) {
+            System.err.println("code is wrong!");
+            return false;
+        }
+
+        return super.filter(user);
+    }
+}

src/main/java/cc/niushuai/demo/designpattern/creatormodel/decorator/filter/LoginFilterDecorator2.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator.filter;
+
+import cc.niushuai.demo.designpattern.creatormodel.decorator.entity.LoginUser;
+
+/**
+ * 构造装饰
+ *
+ * @author niushuai233
+ * @date 2024/1/29 11:09
+ * @since 0.0.1
+ */
+public class LoginFilterDecorator2 {
+
+    private LoginFilter loginFilter;
+
+    public LoginFilterDecorator2(LoginFilter loginFilter) {
+        this.loginFilter = loginFilter;
+    }
+
+    public boolean filter(LoginUser user) {
+
+        if (!"9527".equals(user.getCode())) {
+            System.err.println("code is wrong!");
+            return false;
+        }
+
+        return loginFilter.filter(user);
+    }
+}

src/test/java/cc/niushuai/demo/designpattern/creatormodel/decorator/_01/LoginTest.java

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+/*
+ * Copyright (C) 2023 niushuai233 niushuai.cc
+ *
+ * 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 cc.niushuai.demo.designpattern.creatormodel.decorator._01;
+
+import cc.niushuai.demo.designpattern.creatormodel.decorator.LoginService;
+import org.junit.jupiter.api.Test;
+
+/**
+ * 测试
+ *
+ * @author niushuai233
+ * @date 2024/1/29 10:49
+ * @since 0.0.1
+ */
+public class LoginTest {
+
+
+    @Test
+    public void test_login() {
+
+        LoginService loginService = new LoginService();
+        loginService.login("zhangsan", "123");
+        loginService.login("zh", "pass");
+
+        System.out.println();
+        loginService.login("zhangsan", "123", "9527");
+        loginService.login("zh", "pass", "9527w");
+
+        System.out.println();
+        loginService.login("zh", "pass", "9527");
+    }
+}