使用@Async实现异步调用

Chapter4-1-2/src/main/java/com/didispace/Application.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@SpringBootApplication
+@EnableAsync
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

Chapter4-1-2/src/main/java/com/didispace/async/Task.java

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+package com.didispace.async;
+
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.scheduling.annotation.AsyncResult;
+import org.springframework.stereotype.Component;
+
+import java.util.Random;
+import java.util.concurrent.Future;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/5/16 下午12:58.
+ * @blog http://blog.didispace.com
+ */
+@Component
+public class Task {
+
+    public static Random random =new Random();
+
+    @Async
+    public Future<String> doTaskOne() throws Exception {
+        System.out.println("开始做任务一");
+        long start = System.currentTimeMillis();
+        Thread.sleep(random.nextInt(10000));
+        long end = System.currentTimeMillis();
+        System.out.println("完成任务一，耗时：" + (end - start) + "毫秒");
+        return new AsyncResult<>("任务一完成");
+    }
+
+    @Async
+    public Future<String> doTaskTwo() throws Exception {
+        System.out.println("开始做任务二");
+        long start = System.currentTimeMillis();
+        Thread.sleep(random.nextInt(10000));
+        long end = System.currentTimeMillis();
+        System.out.println("完成任务二，耗时：" + (end - start) + "毫秒");
+        return new AsyncResult<>("任务二完成");
+    }
+
+    @Async
+    public Future<String> doTaskThree() throws Exception {
+        System.out.println("开始做任务三");
+        long start = System.currentTimeMillis();
+        Thread.sleep(random.nextInt(10000));
+        long end = System.currentTimeMillis();
+        System.out.println("完成任务三，耗时：" + (end - start) + "毫秒");
+        return new AsyncResult<>("任务三完成");
+    }
+
+}

Chapter4-1-2/src/test/java/com/didispace/ApplicationTests.java

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+package com.didispace;
+
+import com.didispace.async.Task;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import java.util.concurrent.Future;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = Application.class)
+public class ApplicationTests {
+
+	@Autowired
+	private Task task;
+
+	@Test
+	public void test() throws Exception {
+
+		long start = System.currentTimeMillis();
+
+		Future<String> task1 = task.doTaskOne();
+		Future<String> task2 = task.doTaskTwo();
+		Future<String> task3 = task.doTaskThree();
+
+		while(true) {
+			if(task1.isDone() && task2.isDone() && task3.isDone()) {
+				// 三个任务都调用完成，退出循环等待
+				break;
+			}
+			Thread.sleep(1000);
+		}
+
+		long end = System.currentTimeMillis();
+
+		System.out.println("任务全部完成，总耗时：" + (end - start) + "毫秒");
+
+	}
+
+}