Java反射案例

package weaver.interfaces.workflow.action;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import weaver.conn.RecordSet;
import weaver.interfaces.schedule.BaseCronJob;

/**
 * 定时任务：执行多个计划任务，凡是要修改requestid的都要放到这里执行
 * @author Administrator
 *
 */
public class TimerTask extends BaseCronJob{
    
    // 定时任务固定变量声明
    private String requestid;
    private String mainid;
    private String sqr;
    private String sqbm;
    private Log log;
    private static final String ClassName = "TimerTask";

    public TimerTask() {
        log = LogFactory.getLog(TimerTask.class.getName());
    }

    RecordSet recordSet = new RecordSet();
    
    /*
     * 定时执行的任务，业务逻辑
     */
    public void execute(){
    /*    log.info("==========开始定时任务=============");
        new NoticeOfDelivery().doTask();
        new Warehousing().doTask();
        log.info("==========结束定时任务=============");*/
        
        log.info("=======================开始定时任务========================");
        List<Class> classList = new ArrayList<Class>();//实现对应接口类的集合
        log.info("====================TimerTask:1===========================");
        //path = d:/weaver/ecology/classbean/weaver/interfaces/workflow/action
        //String path = TimerTask.class.getResource("").toString().substring(6);//TimerTask类目录
        String path = "d:/weaver/ecology/classbean/weaver/interfaces/workflow/action";
        log.info("path = " + path);
        try{
            List<String> fileList = find(path);//先获得path下所有的.class文件
            log.info("====================TimerTask:2===========================");
            String packageName = TimerTask.class.getPackage().getName();
            log.info("packageName = " + packageName);
            //获得所有的实现接口BaseTimerTask的类，加到classList
            for (String className : fileList) {
                if ("AccountUserAction".equals(className) || "AccountUserActionT".equals(className) || "BaseTimerTask".equals(className)) {
                    continue;
                }
                Class<Object> classObj = (Class<Object>) Class.forName(packageName+ "." +className);
                if (BaseTimerTask.class.isAssignableFrom(classObj)) {//实现了doTask接口
                    classList.add(classObj);
                }
            }
            log.info("====================TimerTask:3===========================");
            //调用符合条件的接口方法
            for (Class Obj : classList) {
                Method method = Obj.getMethod("doTask");
                method.invoke(Obj.newInstance());
            }
            log.info("=======================结束定时任务========================");
        }catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    
    
    /*
     * 得到一个目录下所有的文件
     */
    public static List<String> find(String path) throws IOException{

        List<String> list = new ArrayList<String>();
        //获取pathName的File对象
        File dirFile = new File(path);
        //判断该文件或目录是否存在，不存在时在控制台输出提醒
        if (!dirFile.exists()) {
            return null;
        }
        //获取此目录下的所有文件名与目录名
        String[] fileList = dirFile.list();
        for (int i = 0; i < fileList.length; i++) {
            //遍历文件目录
            String string = fileList[i];
            //File("documentName","fileName")是File的另一个构造器
            File file = new File(string);
            if (file.getName().endsWith(".class")) {
                list.add(file.getName().substring(0, file.getName().indexOf(".")));
            }
        }
        return list;
    }
}