添加timer类的学习

chenweijie · chenweijie · commit 9c15c81cdbf4 · 2018-05-30T21:42:32.000+08:00
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run1.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run1.java
@@ -0,0 +1,31 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * @author Chen WeiJie
+ * @date 2018-05-30 20:42:55
+ **/
+public class Run1 {
+
+    //定时器，创建一个Timer就是启动一个新的线程。
+    private static Timer timer = new Timer();
+
+    //任务块
+    static public class MyTask extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("执行了：" + System.currentTimeMillis());
+        }
+    }
+
+    public static void main(String[] args) {
+        MyTask task = new MyTask();
+        System.out.println("开始了：" + System.currentTimeMillis());
+        //在10秒后执行
+        timer.schedule(task, 10000);
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run2.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run2.java
@@ -0,0 +1,40 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * @author Chen WeiJie
+ * @date 2018-05-30 20:42:55
+ **/
+public class Run2 {
+
+    //定时器，创建一个Timer就是启动一个新的线程。
+    private static Timer timer = new Timer();
+
+    //任务块
+    static public class MyTask extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("threadName:" + Thread.currentThread().getName() + ",执行了：" + System.currentTimeMillis()/1000);
+        }
+    }
+
+    public static void main(String[] args) {
+        MyTask task1 = new MyTask();
+        MyTask task2 = new MyTask();
+        MyTask task3 = new MyTask();
+        MyTask task4 = new MyTask();
+        MyTask task5 = new MyTask();
+        //TimerTask是以队列的方式顺序执行的，所以执行的时间有可能和预期的时间不一致，因为前面的任务有可能消耗的时间较长，则后面的任务会被顺延。
+        timer.schedule(task1,1000);
+        timer.schedule(task2,9000);
+        timer.schedule(task3,5000);
+        timer.schedule(task4,6000);
+        timer.schedule(task5,8000);
+        System.out.println("开始了：" + System.currentTimeMillis()/1000);
+        //在10秒后执行
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run3.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run3.java
@@ -0,0 +1,42 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * 某一时刻开始，每隔N秒执行一次，无限循环的执行某一任务
+ *
+ * @author Chen WeiJie
+ * @date 2018-05-30 21:05:00
+ **/
+public class Run3 {
+
+
+    private static Timer timer = new Timer();
+
+    static public class MyTask extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("执行了任务：" + System.currentTimeMillis() / 1000);
+        }
+    }
+
+    public static void main(String[] args) {
+
+        MyTask task = new MyTask();
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
+        String dateStr = "2018-05-30 21:11:30";
+        try {
+            timer.schedule(task, sdf.parse(dateStr), 4000);
+        } catch (ParseException e) {
+            e.printStackTrace();
+        }
+
+
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run4.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run4.java
@@ -0,0 +1,54 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * @author Chen WeiJie
+ * @date 2018-05-30 21:16:18
+ **/
+public class Run4 {
+
+
+    static public class MyTaskA extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("a任务开始执行。。");
+            //timerTask的方法，将task从定时任务中移除出去
+            this.cancel();
+        }
+    }
+
+    static public class MyTaskB extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("b任务开始执行。。");
+        }
+    }
+
+
+    public static void main(String[] args) {
+
+        try {
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+            String dateStr = "2018-05-30 21:21:50";
+
+            MyTaskA taskA = new MyTaskA();
+            MyTaskB taskB = new MyTaskB();
+            Timer timer = new Timer();
+
+            timer.schedule(taskA, sdf.parse(dateStr),1000);
+            timer.schedule(taskB, sdf.parse(dateStr),2000);
+
+            System.out.println("开始执行。。。。。");
+        } catch (ParseException e) {
+            e.printStackTrace();
+        }
+
+
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run5.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run5.java
@@ -0,0 +1,54 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * @author Chen WeiJie
+ * @date 2018-05-30 21:16:18
+ **/
+public class Run5 {
+
+
+    static public class MyTaskA extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("a任务开始执行。。");
+        }
+    }
+
+    static public class MyTaskB extends TimerTask {
+        @Override
+        public void run() {
+            System.out.println("b任务开始执行。。");
+        }
+    }
+
+
+    public static void main(String[] args) {
+
+        try {
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+            String dateStr = "2018-05-30 21:22:50";
+
+            MyTaskA taskA = new MyTaskA();
+            MyTaskB taskB = new MyTaskB();
+            Timer timer = new Timer();
+
+            timer.schedule(taskA, sdf.parse(dateStr), 1000);
+            timer.schedule(taskB, sdf.parse(dateStr), 1000);
+            System.out.println("开始执行。。。。。");
+            Thread.sleep(10000);
+            //timer的cancel类，timer定时器类取消
+            timer.cancel();
+        } catch (ParseException | InterruptedException e) {
+            e.printStackTrace();
+        }
+
+
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run6.java b/src/main/java/com/chen/api/util/thread/study/chapter5/timerTest1/Run6.java
@@ -0,0 +1,17 @@
+package com.chen.api.util.thread.study.chapter5.timerTest1;
+
+/**
+ * scheduleAtFixedRate(TimerTask task,Date firstTime,long period)
+ * schedule 和scheduleAtFixedRate主要区别在于不延时的情况，
+ * schedule如果执行的任务没有被延时，那么下一次任务的执行时间参考的执行时间是上一次任务“开始”的时间来计算。
+ * scheduleAtFixedRate 如果执行的任务没有被延时，那么下一次任务的执行时间参考的执行时间是上一次任务“结束”的时间来计算。
+ * 
+ * 延时的情况则没有区别，都是按照结束的时间来计算
+ *
+ * @author Chen WeiJie
+ * @date 2018-05-30 21:27:37
+ **/
+public class Run6 {
+
+}
+
