有些網(wǎng)頁是屏蔽了鼠標(biāo)右鍵的,不讓我們查看它的源代碼或者不讓我們點(diǎn)擊鼠標(biāo)右鍵,在此我們可以寫一個(gè)程序,讓它獲得這個(gè)網(wǎng)頁的流,然后我們不就什么都能看到了嗎?此程序就是這樣寫的,先獲得網(wǎng)頁的輸入流,然后得到這個(gè)輸入流的一些參數(shù),比如這個(gè)流的長度,這個(gè)流所使用的編碼.然后根據(jù)這些參數(shù)來進(jìn)行獲取,并根據(jù)不同的情況提供不同的進(jìn)度條,比如有些網(wǎng)頁它的長度返回的是-1,這個(gè)時(shí)候就用一個(gè)無狀態(tài)的進(jìn)度條來表示,如果長度大于0的話,那就用可以實(shí)時(shí)顯示目前讀取網(wǎng)頁的進(jìn)度.正好借這個(gè)機(jī)會又把swing復(fù)習(xí)了一下.呵呵.

運(yùn)行時(shí)的圖片如下:

下面是代碼.

/*
 * Test4.java
 *
 * Created on 2007年9月27日, 下午3:05
 */

package test2;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;
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.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.UIManager;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;

/**
 *
 * @author  hadeslee
 */
public class Test4 extends javax.swing.JFrame {

    private Task task; //只存在的一個(gè)方法

    /** Creates new form Test4 */
    public Test4() {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception exe) {
            exe.printStackTrace();
        }
        initComponents();
        jpb.setStringPainted(true);
        jpb.setVisible(false);
        this.setLocationRelativeTo(null);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        input = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        output = new javax.swing.JTextArea();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jpb = new javax.swing.JProgressBar();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("查看網(wǎng)頁源文件");
        setResizable(false);

        jLabel1.setForeground(new java.awt.Color(51, 51, 255));
        jLabel1.setText("地址");

        input.setForeground(new java.awt.Color(51, 51, 255));
        input.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                inputActionPerformed(evt);
            }
        });

        jButton1.setForeground(new java.awt.Color(51, 51, 255));
        jButton1.setText("查看");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jScrollPane1.setBorder(javax.swing.BorderFactory.createTitledBorder("源文件"));

        output.setColumns(20);
        output.setEditable(false);
        output.setLineWrap(true);
        output.setRows(5);
        output.setWrapStyleWord(true);
        jScrollPane1.setViewportView(output);

        jButton2.setText("保存");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("退出");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 450, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(input, javax.swing.GroupLayout.DEFAULT_SIZE, 359, Short.MAX_VALUE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton1))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(10, 10, 10)
                        .addComponent(jButton2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jpb, javax.swing.GroupLayout.DEFAULT_SIZE, 314, Short.MAX_VALUE)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jButton1)
                    .addComponent(input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 223, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton2)
                        .addComponent(jButton3))
                    .addComponent(jpb, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        if (task != null) {
            task.cancel();
        }
        task = new Task(input.getText());
        new Thread(task).start();
    }

    private void inputActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        if (task != null) {
            task.cancel();
        }
        task = new Task(input.getText());
        new Thread(task).start();
    }

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        System.exit(0);
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        doSave();
    }

//用于保存的方法
    private void doSave() {
        String s = output.getText();
        if (s == null || s.equals("")) {
            JOptionPane.showMessageDialog(this, "當(dāng)前沒有東西可保存!!");
            return;
        }
        JFileChooser jfc = new JFileChooser(".");
        FileNameExtensionFilter txt = new FileNameExtensionFilter("文本文檔(*.txt)", "txt");
        FileNameExtensionFilter html = new FileNameExtensionFilter("網(wǎng)頁文檔(*.html)", "html", "htm");
        jfc.addChoosableFileFilter(html);
        jfc.addChoosableFileFilter(txt);
        int i = jfc.showSaveDialog(this);
        if (JFileChooser.APPROVE_OPTION == i) {
            BufferedWriter bw = null;
            try {
                File f = jfc.getSelectedFile();
                FileFilter filter = jfc.getFileFilter();
                FileNameExtensionFilter ff = null;
                //如果是可以匹配的,則匹配,否則的話,只能用戶輸入什么
                //就是什么了,即使他不輸入后綴名那也沒辦法了
                if (filter instanceof FileNameExtensionFilter) {
                    ff = (FileNameExtensionFilter) filter;
                    String[] exts = ff.getExtensions();
                    boolean match = false;
                    for (String ext : exts) {
                        if (f.toString().toLowerCase().endsWith(ext.toLowerCase())) {
                            match = true;
                            break;
                        }
                    }
                    //如果沒有匹配,則說明輸入的時(shí)候,沒有輸入后綴名,我們要人工加上去
                    if (!match) {
                        f = new File(f.toString() + "." + exts[0]);
                    }
                }
                bw = new BufferedWriter(new FileWriter(f));
                bw.write(s);
                JOptionPane.showMessageDialog(this, "保存成功!!");
            } catch (IOException ex) {
                Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
            } finally {
                try {
                    if (bw != null) {
                        bw.close();
                    }
                } catch (IOException ex) {
                    Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

//用于取源碼的線程
    private class Task implements Runnable {

        //此任務(wù)是否已經(jīng)取消了
        private volatile boolean isCanceled;
        private String s;
        private int done; //已經(jīng)完成的字節(jié)
        private InputStream is; //連上的輸入流,如果長時(shí)間沒有動(dòng)作,則流也要被強(qiáng)制關(guān)閉
        private long time; //最新一次讀流的時(shí)間

        public Task(String s) {
            this.s = s;
            time = System.currentTimeMillis(); //初始化第一次的時(shí)間
            new Thread() {

                public void run() {
                    while (!isCanceled) {
                        try {
                            Thread.sleep(1000);
                            long now = System.currentTimeMillis();
                            //如果最后一次讀成功字節(jié)到現(xiàn)在已經(jīng)過了30秒鐘了,則強(qiáng)行斷之
                            if (now - time > 30000) {
                                isCanceled = true;
                                jpb.setIndeterminate(false);
                                jpb.setVisible(false);
                                is.close();
                            }
                        } catch (Exception ex) {
                            Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                }
            }.start();
        }

        public void run() {
            validate(s);
        }

        //驗(yàn)證傳入的字符串是否合法
        private void validate(String s) {
            try {
                if (s == null || s.equals("")) {
                    JOptionPane.showMessageDialog(Test4.this, "網(wǎng)址不能為空!!");
                    input.requestFocus();
                    return;
                } else if (s.startsWith("http://")) {
                    //什么都不要做
                } else {
                    //如果沒有加上http的前綴的話,我們幫他加上
                    s = "http://" + s;
                }
                if (isCanceled) {
                    return;
                }
                URL url = new URL(s);
                viewSource(url);
            } catch (MalformedURLException ex) {
                Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
                JOptionPane.showMessageDialog(Test4.this, "域名解析出錯(cuò)!!");
            }
        }

        //執(zhí)行查看網(wǎng)頁源文件的動(dòng)作
        private void viewSource(URL url) {
            try {
                jpb.setVisible(true);
                jpb.setValue(0);
                jpb.setString("");
                HttpURLConnection http = (HttpURLConnection) url.openConnection();
                //得到網(wǎng)頁的內(nèi)容長度,可能為-1
                int length = http.getContentLength();
                if (length != -1) {
                    jpb.setIndeterminate(false);
                    jpb.setMaximum(length);
                    jpb.setValue(0);
                } else {
                    jpb.setString("");
                    jpb.setIndeterminate(true);
                }
                //中間再檢查一下是否取消了本次任務(wù),以免做無謂的功
                if (isCanceled) {
                    return;
                }
                //得到網(wǎng)頁的編碼,可能沒有指定,如果沒有指定,就用默認(rèn)的系統(tǒng)編碼了
                String contentType = http.getContentType();
                String encoding = null; //將要使用的編碼,它將從contentType里面去取
                if (contentType != null) {
                    int index = contentType.indexOf("charset=");
                    if (index != -1) {
                        encoding = contentType.substring(index + 8).trim();
                    }
                }
                is = http.getInputStream();
                //如果得到的長度是-1,則不知道什么時(shí)候會讀完
                //這個(gè)時(shí)候就可以邊讀邊顯示出來
                if (length == -1) {

                    BufferedReader br = new BufferedReader(new InputStreamReader(is));
                    String temp = null;
                    output.setText(null);
                    while (br.ready()) {
                        time = System.currentTimeMillis();
                        temp = br.readLine();
                        if (isCanceled) {
                            return;
                        }
                        output.append(temp + "\r\n");
                    }
                    System.out.println("讀到底了");
                    isCanceled = true;
                    jpb.setIndeterminate(false);
                    jpb.setVisible(false);
                } else {
                    //如果知道長度多長,就可以顯示一個(gè)進(jìn)度條,等所有的字節(jié)都讀完再顯示
                    ByteArrayOutputStream bout = new ByteArrayOutputStream();
                    int data = -1;
                    while ((data = is.read()) != -1) {
                        if (isCanceled) {
                            return;
                        }
                        time = System.currentTimeMillis();
                        if (length > 0) {
                            done++;
                            jpb.setValue(done);
                            int rate = done * 100 / length;
                            jpb.setString("" + rate + "%");
                        }
                        bout.write(data);
                        //如果長度不為-1,并且已經(jīng)讀了這么多長度以后,就要斷線了
                        if (done == length) {
                            String text = null;
                            byte[] b = bout.toByteArray();
                            if (encoding == null) {
                                text = new String(b);
                            } else {
                                text = new String(b, encoding);
                            }
                            if (!isCanceled) {
                                output.setText(text);
                            }
                            isCanceled = true;
                            jpb.setVisible(false);
                            return;
                        }
                    }
                }
            } catch (IOException ex) {
                Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
                if (isCanceled) {
                    return;
                } else {
                    JOptionPane.showMessageDialog(Test4.this, "打開網(wǎng)頁失敗!!");
                }
            } catch (Exception exe) {
                if (isCanceled) {
                    return;
                } else {
                    JOptionPane.showMessageDialog(Test4.this, "打開網(wǎng)頁失敗!!");
                }
            } finally {
                try {
                    if (is != null) {
                        is.close();
                    }
                    jpb.setVisible(false);
                } catch (IOException ex) {
                    Logger.getLogger(Test4.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }

        public void cancel() {
            isCanceled = true;
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new Test4().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JTextField input;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JProgressBar jpb;
    private javax.swing.JTextArea output;
    // End of variables declaration
}

我是用NetBeans寫的,程序部份都有注釋,界面部份是拖出來的,以前我很不喜歡拖控件的,所有的界面都是自己手寫代碼,后來發(fā)現(xiàn)NetBeans的拖控件功能確實(shí)很強(qiáng),應(yīng)該說是JAVA IDE里面最強(qiáng)的了.所以忍不住就用了一下,感覺不錯(cuò),所以向大家推薦一下.可執(zhí)行的JAR文件也一并附上,點(diǎn)擊這里下載.歡迎大家提出問題.

JAVA運(yùn)行環(huán)境是JDK6.0:)