原型模式

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/after/AMail.java

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+package top.fjy8018.designpattern.pattern.creational.prototype.after;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 原型模式：使用原型实例指定待创建对象的类型，并且通过<strong>复制</strong>这个原型来创建新的对象
+ * 适用于初始化对象复杂的场景
+ * <p>
+ * 邮件
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 20:39
+ */
+@Slf4j
+@Getter
+@Setter
+public class AMail implements Cloneable {
+
+    private String name;
+    private String emailAddress;
+    private String content;
+
+    public AMail() throws InterruptedException {
+        // 模拟调用构造器需要复杂过程
+        Thread.sleep(100);
+        log.debug(this.getClass().getSimpleName() + "构造器调用");
+    }
+
+    /**
+     * 带上父类toString方法查看是否为同一个对象
+     *
+     * @return
+     */
+    @Override
+    public String toString() {
+        return "AMail{" +
+                "name='" + name + '\'' +
+                ", emailAddress='" + emailAddress + '\'' +
+                ", content='" + content + '\'' +
+                '}';
+    }
+
+    /**
+     * 调用克隆函数不需要调用构造器以此加快实例化速度
+     *
+     * @return
+     * @throws CloneNotSupportedException
+     */
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/after/AMailUtil.java

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+package top.fjy8018.designpattern.pattern.creational.prototype.after;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.text.MessageFormat;
+
+/**
+ * 邮件发送类
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 20:42
+ */
+@Slf4j
+public class AMailUtil {
+    public static void sendEmail(AMail mail) {
+        String content = "向{0}同学,邮件地址:{1},邮件内容:{2}发送邮件成功";
+        log.info(MessageFormat.format(content, mail.getName(), mail.getEmailAddress(), mail.getContent()));
+    }
+
+    public static void saveOriginMail(AMail mail) {
+        log.info("存储Mail记录，originMailContent：{}", mail.getContent());
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/before/BMail.java

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+package top.fjy8018.designpattern.pattern.creational.prototype.before;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 原型模式：使用原型实例指定待创建对象的类型，并且通过<strong>复制</strong>这个原型来创建新的对象
+ * 适用于初始化对象复杂的场景
+ * <p>
+ * 邮件
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 20:39
+ */
+@Slf4j
+@Getter
+@Setter
+public class BMail {
+
+    private String name;
+    private String emailAddress;
+    private String content;
+
+    public BMail() throws InterruptedException {
+        // 模拟调用构造器需要复杂过程
+        Thread.sleep(100);
+        log.debug(this.getClass().getSimpleName() + "构造器调用");
+    }
+
+    @Override
+    public String toString() {
+        return "AMail{" +
+                "name='" + name + '\'' +
+                ", emailAddress='" + emailAddress + '\'' +
+                ", content='" + content + '\'' +
+                '}';
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/before/BMailUtil.java

@@ -0,0 +1,24 @@
+package top.fjy8018.designpattern.pattern.creational.prototype.before;
+
+import lombok.extern.slf4j.Slf4j;
+import top.fjy8018.designpattern.pattern.creational.prototype.before.BMail;
+
+import java.text.MessageFormat;
+
+/**
+ * 邮件发送类
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 20:42
+ */
+@Slf4j
+public class BMailUtil {
+    public static void sendEmail(BMail mail) {
+        String content = "向{0}同学,邮件地址:{1},邮件内容:{2}发送邮件成功";
+        log.info(MessageFormat.format(content, mail.getName(), mail.getEmailAddress(), mail.getContent()));
+    }
+
+    public static void saveOriginMail(BMail mail) {
+        log.info("存储Mail记录，originMailContent：{}", mail.getContent());
+    }
+}

src/test/java/top/fjy8018/designpattern/pattern/creational/prototype/before/BMailTest.java

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+package top.fjy8018.designpattern.pattern.creational.prototype.before;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import top.fjy8018.designpattern.pattern.creational.prototype.after.AMail;
+import top.fjy8018.designpattern.pattern.creational.prototype.after.AMailUtil;
+
+@Slf4j
+class BMailTest {
+
+    private long start;
+
+    @BeforeEach
+    void init() {
+        start = System.currentTimeMillis();
+    }
+
+    @AfterEach
+    void destory() {
+        log.debug("耗时{}ms", System.currentTimeMillis() - start);
+    }
+
+    /**
+     * 每次实例化对象，耗时长——耗时613ms
+     *
+     * @throws Exception
+     */
+    @Test
+    void before() throws Exception {
+        BMail mail = new BMail();
+        mail.setContent("原始正文");
+        for (int i = 0; i < 5; i++) {
+            // 初始化临时发送邮件对象，防止原始正文被最后一个对象覆盖
+            BMail tempMail = new BMail();
+            tempMail.setName("学员" + i);
+            tempMail.setContent("正文" + i);
+            tempMail.setEmailAddress("地址" + i);
+            BMailUtil.sendEmail(tempMail);
+        }
+        // 本意希望在发送完所有邮件后保存开始的正文
+        BMailUtil.saveOriginMail(mail);
+
+    }
+
+    /**
+     * 调用克隆方法（浅拷贝，因为没有对每个属性实现克隆方法），显然速度更快——耗时110ms
+     *
+     * @throws Exception
+     */
+    @Test
+    void after() throws Exception {
+        AMail mail = new AMail();
+        mail.setContent("原始正文");
+        // 通过hashCode查看是否为同一个对象
+        log.debug(Integer.toHexString(mail.hashCode()));
+        for (int i = 0; i < 5; i++) {
+            // 初始化临时发送邮件对象，防止原始正文被最后一个对象覆盖
+            AMail tempMail = (AMail) mail.clone();
+            tempMail.setName("学员" + i);
+            tempMail.setContent("正文" + i);
+            tempMail.setEmailAddress("地址" + i);
+            AMailUtil.sendEmail(tempMail);
+            log.debug(Integer.toHexString(tempMail.hashCode()));
+        }
+        // 本意希望在发送完所有邮件后保存开始的正文
+        AMailUtil.saveOriginMail(mail);
+
+    }
+}