java中的接口是类吗
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2023-07-27
java基于线程池和反射机制实现定时任务完整实例
本文实例讲述了java基于线程池和反射机制实现定时任务的方法。分享给大家供大家参考,具体如下:
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 { 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.InvocationTargetExcNKtVCQDFeption; 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 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: 6. 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!"); } } 希望本文所述对大家Java程序设计有所帮助。
{
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.InvocationTargetExcNKtVCQDFeption;
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
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:
6. 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!");
}
}
希望本文所述对大家Java程序设计有所帮助。
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