java利用jnotify監視目錄變化

java本身不能直接監聽系統的文件操作事件,但可以用第三方開源軟件監控。

在這里介紹JNotify 大家可以在sourceforge上去下載。說說用法，其實真的好簡單代碼如下

1.下載成功后，把jnotify.dll放到system32下面，不然就會報錯Exception in thread "main" java.lang.UnsatisfiedLinkError: no jnotify in java.library.path

2.寫一個類implements JNotifyListener，

public class JnotifyListener implements JNotifyListener {

    @Override
    public void fileCreated(int arg0, String arg1, String arg2) {
        System.out.println("fileCreate path:" + arg1);
        System.out.println("fileCreate name:" + arg2);
    }

    @Override
    public void fileDeleted(int arg0, String arg1, String arg2) {
        System.out.println("fileDeleted path:" + arg1);
        System.out.println("fileDeleted name :" + arg2);
    }

    @Override
    public void fileModified(int arg0, String arg1, String arg2) {
        System.out.println("fileModified path:" + arg1);
        System.out.println("fileModified name:" + arg2);
    }

    @Override
    public void fileRenamed(int arg0, String arg1, String arg2, String arg3) {
        System.out.println("fileRenamed path:" + arg1);
        System.out.println("fileRenamedname:" + arg2);
    }

}

然后寫個測試類

public class TestJnotify {

    public static void main(String[] args) throws JNotifyException {

        int mask = JNotify.FILE_CREATED | JNotify.FILE_DELETED |JNotify.FILE_MODIFIED | JNotify.FILE_RENAMED;
        JNotify.addWatch("e:/testListener", mask, true, new JnotifyListener());
        for (;;) {    
        }
    }

}

這樣就可以實現監視目錄變化了