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@@ -266,3 +266,168 @@ public class TestDemo1 {
  */
 ```
 
+
+
+### 文件加密模块抽象门类
+
+在不修改客户端代码的前提下使用新的外观类？解决方法是：引入一个抽象外观类，客户端针对抽象外观类编程，而在运行时再确定具体外观类。使其复合开闭原则。
+
+> 文件加密模块中需要更换一个加密类，不再使用原有的基于求模运算的加密类CipherMachine，而改为基于移位运算的新加密类NewCipherMachine
+
+![image-20240327204005053](/images/designpattern/image-20240327204005053.png)
+
+![image-20240327205421549](/images/designpattern/image-20240327205421549.png)
+
+#### 新加密算法
+
+```java
+package org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.子系统;
+
+public class NewCipherMachine {
+    public String encrypt(String plainText) {
+        System.out.print("数据加密，将明文转换为密文：");
+        String es = "";
+        int key = 10;//设置密钥，移位数为10
+        for (int i = 0; i < plainText.length(); i++) {
+            char c = plainText.charAt(i);
+            //小写字母移位
+            if (c >= 'a' && c <= 'z') {
+                c += key % 26;
+                if (c > 'z') c -= 26;
+                if (c < 'a') c += 26;
+            }
+            //大写字母移位
+            if (c >= 'A' && c <= 'Z') {
+                c += key % 26;
+                if (c > 'Z') c -= 26;
+                if (c < 'A') c += 26;
+            }
+            es += c;
+        }
+        System.out.println(es);
+        return es;
+    }
+}
+```
+
+
+
+#### 抽象门面
+
+```java
+/**
+ * 抽象门面
+ */
+public abstract class  AbstractEncryptFacade {
+    public abstract void fileEncrypt(String fileNameSrc, String fileNameDes);
+}
+
+```
+
+#### 新门面
+
+```java
+package org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面;
+
+import org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.子系统.FileReader;
+import org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.子系统.FileWriter;
+import org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.子系统.NewCipherMachine;
+
+public class NewEncryptFacade extends AbstractEncryptFacade {
+    private FileReader reader;
+    private NewCipherMachine cipher;
+    private FileWriter writer;
+
+    public NewEncryptFacade() {
+        reader = new FileReader();
+        cipher = new NewCipherMachine();
+        writer = new FileWriter();
+    }
+
+    public void fileEncrypt(String fileNameSrc, String fileNameDes) {
+        String plainStr = reader.read(fileNameSrc);
+        String encryptStr = cipher.encrypt(plainStr);
+        writer.write(encryptStr,fileNameDes);
+    }
+}
+```
+
+#### 配置文件xml
+
+在xml文件中指定需要的门面
+
+```xml
+<?xml version="1.0"?>
+<config>
+    <className>org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.NewEncryptFacade</className>
+</config>
+
+```
+
+#### 解析xml
+
+解析xml并加载类，和创建实例
+
+```java
+package org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.utils;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.io.File;
+
+public class XMLUtil {
+    //该方法用于从XML配置文件中提取具体类类名，并返回一个实例对象
+    public static Object getBean() {
+        try {
+            //创建DOM文档对象
+            DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
+            DocumentBuilder builder = dFactory.newDocumentBuilder();
+            Document doc;
+            doc = builder.parse(new File("src//main//resources//facade//config.xml"));
+
+            //获取包含类名的文本节点
+            NodeList nl = doc.getElementsByTagName("className");
+            Node classNode=nl.item(0).getFirstChild();
+            String cName=classNode.getNodeValue();
+
+            //通过类名生成实例对象并将其返回
+            Class c=Class.forName(cName);
+            Object obj=c.newInstance();
+            return obj;
+        }
+        catch(Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+}
+```
+
+#### 测试
+
+```java
+package org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计;
+
+import org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.utils.XMLUtil;
+import org.hzz.结构性模式.SP1_门面模式.案例.文件加密模块的设计.门面.AbstractEncryptFacade;
+
+
+public class TestDemo2 {
+    public static void main(String[] args) {
+        // 使用抽象类，运行时动态决定使用哪个具体的门面。这里由配置文件决定
+        AbstractEncryptFacade ef  = (AbstractEncryptFacade) XMLUtil.getBean();;
+        assert ef != null;
+        ef.fileEncrypt("facade//src.txt","facade//des.txt");
+    }
+}
+/**
+ * 读取文件，获取明文：hello world
+ * 数据加密，将明文转换为密文：rovvy gybvn
+ * 保密文件,写入文件
+ */
+```
+