文章标题：java中基于线程池和反射机制实现定时任务
文章地址: http://blog.csdn.net/5iasp/article/details/10949925
作者： javaboy2012
Email：yanek@163.com
qq: 1046011462
直接上代码：
主要包括如下实现类：
1. Main类：
任务执行的入口：
调用main方法，开始加载任务配置并执行任务
package com.yanek.task;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
ScheduledExecutorService scheduExec = Executors.newScheduledThreadPool(1);
/*
TaskModel tm=new TaskModel();
tm.setClassName("com.yanek.task.TaskA");
tm.setMethodName("testA");
tm.setInitialDelay(3);
tm.setPeriod(5);
*/
List tasks=XmlReader.getTasks();
for (int i=0;i<tasks.size();i++)
{
TaskModel tm=(TaskModel)tasks.get(i);
scheduExec.scheduleAtFixedRate(new MyTask(tm),tm.getInitialDelay(), tm.getPeriod(), TimeUnit.SECONDS);
}
}
}
2. MyTask 类 实现Runnable接口，在main类中调用
package com.yanek.task;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;
public class MyTask implements Runnable {
private TaskModel taskModel;
public MyTask() {}
public MyTask(TaskModel tm) {
this.taskModel = tm;
}
public void run() {
System.out.println("call at " + (new Date()));
try {
Class<?> classType = Class.forName(taskModel.getClassName());
Method getMethod = classType.getMethod(taskModel.getMethodName());
getMethod.invoke(classType);
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
3. TaskModel： 对任务类的封装
package com.yanek.task;
public class TaskModel {
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
public String getMethodName() {
return methodName;
}
public void setMethodName(String methodName) {
this.methodName = methodName;
}
public long getInitialDelay() {
return initialDelay;
}
public void setInitialDelay(long initialDelay) {
this.initialDelay = initialDelay;
}
public long getPeriod() {
return period;
}
public void setPeriod(long period) {
this.period = period;
}
private String className;
private String methodName;
private long initialDelay;
private long period;
}
4. XmlReader 任务配置解析类
package com.yanek.task;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
public class XmlReader {
public static void main(String[] args) {
XmlReader.getTasks();
}
public static List getTasks() {
List tasks = new ArrayList();
System.out.println("load task config start...");
String path = "/work/TaskManager/conf/taskconfig.xml";
File file = new File(path);
if (file.exists() && !file.isDirectory()) {
try {
SAXBuilder sx = new SAXBuilder();
Document doc = sx.build(file);
Element rootelement = doc.getRootElement();
List<Element> childs = rootelement.getChildren();
for (int i = 0; i < childs.size(); i++) {
TaskModel tModel = new TaskModel();
tModel.setClassName(childs.get(i).getChildText("class"));
System.out.println(childs.get(i).getChildText("class"));
tModel.setMethodName(childs.get(i).getChildText("method"));
System.out.println(childs.get(i).getChildText("method"));
String initialDelay = childs.get(i).getChildText("initialDelay");
tModel.setInitialDelay((Long.valueOf(initialDelay)));
System.out.println("距离首次运行还差" + initialDelay + "秒！");
tModel.setPeriod(Integer.valueOf(childs.get(i).getChildText("period")));
System.out.println(childs.get(i).getChildText("period"));
tasks.add(tModel);
}
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JDOMException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("file no exist!");
}
System.out.println("load task config end !");
return tasks;
}
}
5. 配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<taskconfig>
<task>
<class>com.yanek.task.TaskA</class>
<method>testA</method>
<initialDelay>5</initialDelay>
<period>2</period>
</task>
<task>
<class>com.yanek.task.TaskB</class>
<method>testB</method>
<initialDelay>5</initialDelay>
<period>3</period>
</task>
<task>
<class>com.yanek.task.TaskC</class>
<method>testC</method>
<initialDelay>5</initialDelay>
<period>3</period>
</task>
</taskconfig>
5. 测试任务类：
TaskA TaskB TaskC其中定义静态方法 ，这些类的静态方法配置在 xml文件中，被调用。
package com.yanek.task;
public class TaskA {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println("task a test");
}
public static void testA()
{
System.out.println("taska testA method call!");
}
}
package com.yanek.task;
public class TaskB {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println("task b test");
}
public static void testB()
{
System.out.println("TaskB testB method call!");
}
}
package com.yanek.task;
public class TaskC {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println("task c test");
}
public static void testC()
{
System.out.println("Taskc testC method call!");
}
}
