import java.awt.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
public class CheckLinks extends javax.swing.JFrame implements
Runnable,ISpiderReportable {
public CheckLinks()
{
//{{INIT_CONTROLS
    setTitle("找到死链接");
getContentPane().setLayout(null);
setSize(405,288);
setVisible(false);
label1.setText("输入一个URL：");
getContentPane().add(label1);
label1.setBounds(12,12,84,12);
begin.setText("Begin");
begin.setActionCommand("Begin");
getContentPane().add(begin);
begin.setBounds(12,36,84,24);
getContentPane().add(url);
url.setBounds(108,36,288,24);
errorScroll.setAutoscrolls(true);
errorScroll.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorScroll.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorScroll.setOpaque(true);
getContentPane().add(errorScroll);
errorScroll.setBounds(12,120,384,156);
errors.setEditable(false);
errorScroll.getViewport().add(errors);
errors.setBounds(0,0,366,138);
current.setText("当前处理进度：");
getContentPane().add(current);
current.setBounds(12,72,384,12);
goodLinksLabel.setText("正常链接:0");
getContentPane().add(goodLinksLabel);
goodLinksLabel.setBounds(12,96,192,12);
badLinksLabel.setText("死链接:0");
getContentPane().add(badLinksLabel);
badLinksLabel.setBounds(216,96,96,12);
//}}
//{{INIT_MENUS
//}}
//{{REGISTER_LISTENERS
    SymAction lSymAction = new SymAction();
begin.addActionListener(lSymAction);
//}}
  }
/**
*参数args未使用
*/
static public void main(String args[])
{
(new CheckLinks()).setVisible(true);
}
/**
*添加通知
*/
public void addNotify()
{
//记录窗口尺寸并调用父类的addNotify.
    Dimension size = getSize();
super.addNotify();
if ( frameSizeAdjusted )
return;
frameSizeAdjusted = true;
//根据菜单栏等调整Frame尺寸
    Insets insets = getInsets();
javax.swing.JMenuBar menuBar = getRootPane().getJMenuBar();
int menuBarHeight = 0;
if ( menuBar != null )
menuBarHeight = menuBar.getPreferredSize().height;
setSize(insets.left + insets.right + size.width, insets.top +
insets.bottom + size.height +
menuBarHeight);
}
boolean frameSizeAdjusted = false;
//{{DECLARE_CONTROLS
  javax.swing.JLabel label1 = new javax.swing.JLabel();
javax.swing.JButton begin = new javax.swing.JButton();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JScrollPane errorScroll =
new javax.swing.JScrollPane();
/**
*存储错误信息
*/
javax.swing.JTextArea errors = new javax.swing.JTextArea();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JLabel goodLinksLabel = new javax.swing.JLabel();
javax.swing.JLabel badLinksLabel = new javax.swing.JLabel();
//}}
//{{DECLARE_MENUS
//}}

/**
*后台蜘蛛线程
*/
protected Thread backgroundThread;
protected Spider spider;
protected URL base;
protected int badLinksCount = 0;
protected int goodLinksCount = 0;
/**
*用于分发事件的内部类
*/
class SymAction implements java.awt.event.ActionListener {
public void actionPerformed(java.awt.event.ActionEvent event)
{
Object object = event.getSource();
if ( object == begin )
begin_actionPerformed(event);
}
}
/**
*当begin或cancel按钮被点击时调用
*
*参数event与按钮相连
*/
void begin_actionPerformed(java.awt.event.ActionEvent event)
{
if ( backgroundThread==null ) {
begin.setLabel("Cancel");
backgroundThread = new Thread(this);
backgroundThread.start();
goodLinksCount=0;
badLinksCount=0;
} else {
spider.cancel();
}
}
/**
*执行后台线程操作
*/
public void run()
{
try {
errors.setText("");
spider = new Spider(this);
spider.clear();
base = new URL(url.getText());
spider.addURL(base);
spider.begin();
Runnable doLater = new Runnable()
{
public void run()
{
begin.setText("Begin");
}
};
SwingUtilities.invokeLater(doLater);
backgroundThread=null;
} catch ( MalformedURLException e ) {
UpdateErrors err = new UpdateErrors();
err.msg = "错误地址。";
SwingUtilities.invokeLater(err);
}
}
/**
*当找到某一URL时由蜘蛛调用，在此验证链接。
*
*参数base是找到链接时的页面
*参数url是链接地址
*/
public boolean spiderFoundURL(URL base,URL url)
{
UpdateCurrentStats cs = new UpdateCurrentStats();
cs.msg = url.toString();
SwingUtilities.invokeLater(cs);
if ( !checkLink(url) ) {
UpdateErrors err = new UpdateErrors();
err.msg = url+"(on page " + base + ")\n";
SwingUtilities.invokeLater(err);
badLinksCount++;
return false;
}
goodLinksCount++;
if ( !url.getHost().equalsIgnoreCase(base.getHost()) )
return false;
else
return true;
}
/**
*当发现URL错误时调用
*
*参数url是导致错误的URL
*/
public void spiderURLError(URL url)
{
}
/**
*由内部调用检查链接是否有效
*
*参数url是被检查的链接
*返回True表示链接正常有效
*/
protected boolean checkLink(URL url)
{
try {
URLConnection connection = url.openConnection();
connection.connect();
return true;
} catch ( IOException e ) {
return false;
}
}
/**
*当蜘蛛找到电子邮件地址时调用
*
*参数email为找到的电子邮件地址
*/
public void spiderFoundEMail(String email)
{
}
/**
*以线程安全方式更新错误信息的内部类
*/
class UpdateErrors implements Runnable {
public String msg;
public void run()
{
errors.append(msg);
}
}
/**
*以线程安全方式更新当前状态信息
*/
class UpdateCurrentStats implements Runnable {
public String msg;
public void run()
{
current.setText("当前进度：" + msg );
goodLinksLabel.setText("正常链接：" + goodLinksCount);
badLinksLabel.setText("死链接：" + badLinksCount);
}
}
}