监控网页内容，发现需要的内容后弹框和声音提醒

帮朋友的忙写了个小应用，他需要每隔一段时间自动访问一个网页，如果发现特定的内容就弹框提醒和声音提醒,一条消息已经提醒过了就不用再次提醒了,只有遇到新的才提醒。

package com.tgb.lk.demo.httpclient;

/**
 * Created by likun on 2015/9/28.
 */
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JLabel;
import javax.swing.WindowConstants;

public class DialogMessage extends javax.swing.Jframe {
    private JLabel text;
    Toolkit tk = Toolkit.getDefaultToolkit（）;
    Dimension screenSize = tk.getScreenSize（）;
    int height = screenSize.height;
    int width = screenSize.width;
    private String str = null;

    public DialogMessage（String str） {
        this.str = str;
        new Thread（new Runnable（） {
            @Override
            public void run（） {
                initGUI（）;
            }
        }）.start（）;
    }

    private void initGUI（） {
        try {
            setUndecorated（true）;
            setLocationRelativeTo（null）;
            setVisible（true）;
            setDefaultCloseOperation（WindowConstants.DISPOSE_ON_CLOSE）;
            {
                text = new JLabel（““ + str + ““ JLabel.CENTER）;
                getContentPane（）.add（text BorderLayout.CENTER）;
                text.setBackground（new java.awt.Color（255 251 240））;
            }
            pack（）;
            setBounds（width - 380 height - 150 360 100）;
            try {
                Thread.sleep（9000）;
            } catch （InterruptedException e1） {
                e1.printStackTrace（）;
            }
            dispose（）;
        } catch （Exception e） {
            e.printStackTrace（）;
        }
    }

}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2015-09-30 22:20  lk-httpclient\
     文件       12850  2015-09-30 22:19  lk-httpclient\lk-httpclient.iml
     文件        1169  2015-09-30 22:20  lk-httpclient\pom.xml
     目录           0  2015-09-23 12:03  lk-httpclient\src\
     目录           0  2015-09-23 12:03  lk-httpclient\src\main\
     目录           0  2015-09-23 13:33  lk-httpclient\src\main\java\
     目录           0  2015-09-23 13:33  lk-httpclient\src\main\java\com\
     目录           0  2015-09-23 13:33  lk-httpclient\src\main\java\com\tgb\
     目录           0  2015-09-23 13:33  lk-httpclient\src\main\java\com\tgb\lk\
     目录           0  2015-09-23 13:33  lk-httpclient\src\main\java\com\tgb\lk\demo\
     目录           0  2015-09-30 22:04  lk-httpclient\src\main\java\com\tgb\lk\demo\httpclient\
     文件        1579  2015-09-30 22:04  lk-httpclient\src\main\java\com\tgb\lk\demo\httpclient\DialogMessage.java
     文件        3900  2015-09-30 22:04  lk-httpclient\src\main\java\com\tgb\lk\demo\httpclient\HttpClientTest.java
     文件         820  2015-09-28 13:09  lk-httpclient\src\main\java\com\tgb\lk\demo\httpclient\SoundMessage.java
     目录           0  2015-09-28 13:00  lk-httpclient\src\main\resources\
     目录           0  2015-09-28 13:08  lk-httpclient\src\main\resources\sounds\
     文件       90044  2015-09-28 13:07  lk-httpclient\src\main\resources\sounds\alert.wav
     目录           0  2015-09-23 12:03  lk-httpclient\src\test\
     目录           0  2015-09-30 22:21  lk-httpclient\src\test\java\
     目录           0  2015-09-30 22:20  lk-httpclient\target\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\com\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\
     目录           0  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\
     文件         707  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\DialogMessage$1.class
     文件        2378  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\DialogMessage.class
     文件        2626  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\HttpClientTest$1.class
     文件        3932  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\HttpClientTest.class
     文件        1549  2015-09-30 22:20  lk-httpclient\target\classes\com\tgb\lk\demo\httpclient\SoundMessage$1.class
............此处省略9个文件信息