123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135import java.awt.BorderLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.regex.Matcher;import java.util.regex.Pattern; import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField; public class HttpViewer extends JFrame {    private JTextField urlInput;    private JTextArea viewArea;     public static void main(String[] args) {        new HttpViewer();    }     public HttpViewer() {        this.setTitle("Http Viewer");        this.setSize(800, 600);        this.setResizable(false);        this.setDefaultCloseOperation(EXIT_ON_CLOSE);        initPanel();        initAction();        this.setVisible(true);    }     // 這個(gè)方法用來(lái)設(shè)置窗口布局    private void initPanel() {        JPanel northPanel = new JPanel();        JLabel urlInputLabel = new JLabel("URL:");        urlInput = new JTextField(60);        northPanel.add(urlInputLabel);        northPanel.add(urlInput);        this.add(northPanel, BorderLayout.NORTH);         JPanel centerPanel = new JPanel();        viewArea = new JTextArea(27, 60);        centerPanel.add(new JScrollPane(viewArea));        this.add(centerPanel);    }     // 這個(gè)方法用來(lái)設(shè)置事件    private void initAction() {        urlInput.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                String text = urlInput.getText();                if (text == null || text.length() == 0) {                    viewArea.setText("您沒(méi)有輸入U(xiǎn)RL");                    return;                }                try {                    URL url = new URL(text);                    String context = getContent(url);                    if (context != null) {                        searchFromText(context);                    }                } catch (MalformedURLException e1) {                    viewArea.setText("您輸入的URL不合法:" + text);                }            }        });    }     private String getContent(URL url) {        StringBuffer builder = new StringBuffer();         int responseCode = -1;        HttpURLConnection con = null;        try {            con = (HttpURLConnection) url.openConnection();            con.setRequestProperty("User-Agent",                    "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");// IE代理進(jìn)行下載            con.setConnectTimeout(60000);            con.setReadTimeout(60000);             // 獲得網(wǎng)頁(yè)返回信息碼            responseCode = con.getResponseCode();             if (responseCode == -1) {                viewArea.setText("連接失敗:" + url.toString());                return null;            }             if (responseCode >= 400) {                viewArea.setText("請(qǐng)求失敗，錯(cuò)誤碼:" + responseCode);                return null;            }             InputStream is = con.getInputStream();            InputStreamReader isr = new InputStreamReader(is);            BufferedReader br = new BufferedReader(isr);             String str = null;            while ((str = br.readLine()) != null)                builder.append(str);            is.close();        } catch (IOException e) {            e.printStackTrace();            viewArea.setText("IOException: " + url.toString());        } finally {            con.disconnect();        }        return builder.toString();    }     private void searchFromText(String context) {        viewArea.setText("查找URL中：\n");        Pattern pattern = Pattern.compile("<a( [^>]+)*>(.*?)</a>");        Matcher matcher = pattern.matcher(context);        while (matcher.find()) {            for (String prop : matcher.group(1).split(" ")) {                int indexOf = prop.indexOf('=');                if (indexOf > 0) {                    if (prop.substring(0, indexOf).equals("href")) {                        String url2 = prop.substring(indexOf + 2, prop.length() - 1);                        viewArea.append(url2 + "\n");                    }                }            }        }    } }