JAVA网络应用基础

1.获取本地主机的IP地址

import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.net.*;import javax.swing.*;@SuppressWarnings("serial")//如果编译器出现这样的警告信息：The serializable class WmailCalendar does not declare a static final serialVersionUID field of type long//使用这个注释将警告信息去掉public class GetLocalHostIpFrame extends JFrame{private JTextField tf_ip;//单行文本输入框public static void main(String args[]){EventQueue.invokeLater(new Runnable(){public void run(){try{GetLocalHostIpFrame frame=new GetLocalHostIpFrame();frame.setVisible(true);}catch(Exception e){e.printStackTrace();}}});}//创建窗口public GetLocalHostIpFrame(){super();getContentPane().setLayout(null);setTitle("获取本地主机的IP地址");setBounds(100,100,340,211);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JButton button=new JButton();button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtry{InetAddress inetAddr=InetAddress.getLocalHost();//创建本地主机的InetAddress对象String ip=inetAddr.getHostAddress();//获得本地主机的IP地址tf_ip.setText(ip);}catch(UnknownHostException e1){e1.printStackTrace();//命令行打印异信息程序错位置及原因}}});button.setText("获取IP地址");button.setBounds(29,113,106,28);getContentPane().add(button);final JLabel label=new JLabel();label.setForeground(new Color(0,0,255));label.setFont(new Font("",Font.BOLD,16));label.setText("获取本地主机的IP地址");label.setBounds(73,22,171,35);getContentPane().add(label);final JLabel label_1=new JLabel();label_1.setText("IP地址：");label_1.setBounds(29,75,66,18);getContentPane().add(label_1);tf_ip=new JTextField();tf_ip.setBounds(88,73,199,22);getContentPane().add(tf_ip);//在文本框中显示ip地址final JButton button_1=new JButton();button_1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});button_1.setText("退出系统");button_1.setBounds(181,113,106,28);getContentPane().add(button_1);}}

2.通过IP地址获取域名和主机名

import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.net.*;@SuppressWarnings("serial")public class ByIpGainDomainFrame extends JFrame{JTextField tf_ip;JTextField tf_canonical;JTextField tf_host;public static void main(String args[]){EventQueue.invokeLater(new Runnable(){public void run(){try{ByIpGainDomainFrame frame=new ByIpGainDomainFrame();frame.setVisible(true);}catch(Exception e){e.printStackTrace();}}});}public ByIpGainDomainFrame(){super();this.getContentPane().setLayout(null);this.setTitle("通过IP地址获得域名和主机名");this.setBounds(100,100,333,218);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JButton button=new JButton();button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtry{String ip=tf_ip.getText();//获取IP地址//System.out.println(ip);String[] ipStr=ip.split("[.]");byte[] ipBytes=new byte[4];for(int i=0;i<4;i++){int m=Integer.parseInt(ipStr[i]);byte b=(byte)(m&0xFF);//byte是个八个字节ipBytes[i]=b;}InetAddress inetAddr=InetAddress.getByAddress(ipBytes);String canonical=inetAddr.getCanonicalHostName();//获取域名String host=inetAddr.getHostName();//获取主机名tf_canonical.setText(canonical);tf_host.setText(host);}catch(UnknownHostException e1){e1.printStackTrace();}}});button.setText("获取域名和主机名");button.setBounds(28,136,150,28);this.getContentPane().add(button);JLabel label=new JLabel();label.setForeground(new Color(0,0,255));label.setFont(new Font("",Font.BOLD,16));label.setText("通过IP地址获得域名和主机名");label.setBounds(51,10,223,35);this.getContentPane().add(label);JLabel label_1=new JLabel();label_1.setText("主 机 名");label_1.setBounds(28,110,66,18);this.getContentPane().add(label_1);tf_host=new JTextField();tf_host.setBounds(87,108,199,22);this.getContentPane().add(tf_host);JButton button_1=new JButton();button_1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});button_1.setText("退出系统");button_1.setBounds(191,136,95,28);this.getContentPane().add(button_1);JLabel label_2=new JLabel();label_2.setText("域  名");label_2.setBounds(28,82,66,18);this.getContentPane().add(label_2);tf_canonical=new JTextField();tf_canonical.setBounds(87,80,199,22);this.getContentPane().add(tf_canonical);JLabel label_3=new JLabel();label_3.setText("输入IP地址：");label_3.setBounds(10,51,84,18);this.getContentPane().add(label_3);tf_ip=new JTextField();tf_ip.setBounds(87,52,199,22);this.getContentPane().add(tf_ip);}}

3.获得内网所有IP地址

import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.*;import java.net.*;import java.io.*;import java.util.*;public class GainAllIpFrame extends JFrame{JTextArea ta_allIp;public Hashtable<String,String> pingMap;public static void main(String args[]){GainAllIpFrame frame=new GainAllIpFrame();frame.setVisible(true);}public void gainAllIp() throws Exception{//获得所有IP并在文本域中显示InetAddress host=InetAddress.getLocalHost();//获取本机的InetAddress对象String hostAddress=host.getHostAddress();//获得本机的IP地址System.out.println("本机IP地址是： "+hostAddress);int pos=hostAddress.lastIndexOf(".");//IP地址中最后一个.的位置String wd=hostAddress.substring(0,pos+1);//对IP地址进行截取  获取网段for(int i=1;i<=255;i++){String ip=wd+i;//生成ip地址PingIpThread thread=new PingIpThread(ip);//创建进程对象thread.start();}Set<String> set=pingMap.keySet();//获得集合中键的SET视图Iterator<String> it=set.iterator();//获得迭代器对象while(it.hasNext()){String key=it.next();String value=pingMap.get(key);//获得指定建的值if(value.equals("true")){ta_allIp.append(key+"\n");//追加显示IP地址}}}public GainAllIpFrame(){super();addWindowListener(new WindowAdapter(){public void windowOpened(WindowEvent e){try{gainAllIp();ta_allIp.setText(null);}catch(Exception e1){ta_allIp.setText(null);}}});setTitle("获得内网的所有IP地址");this.setBounds(400,200,270,375);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JScrollPane scrollPane=new JScrollPane();getContentPane().add(scrollPane,BorderLayout.CENTER);ta_allIp=new JTextArea();this.getContentPane().add(ta_allIp);JPanel panel=new JPanel();this.getContentPane().add(panel,BorderLayout.NORTH);JButton button=new JButton();button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtry{System.out.println("按下显示所有IP");ta_allIp.setText(null);gainAllIp();}catch(Exception e1){ta_allIp.setText(null);JOptionPane.showMessageDialog(null,"应用程序异常");}}});button.setText("显示所有IP");panel.add(button);JButton button_1=new JButton();button_1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});button_1.setText("退   出");panel.add(button_1);//JButton button_2=new JButton();//button_2.setText("New JButton");//panel.add(button_2);pingMap=new Hashtable<String,String>();}class PingIpThread extends Thread{public String ip;public PingIpThread(String ip){this.ip=ip;}public void run(){try{Process process=Runtime.getRuntime().exec("ping"+ip+" -w 10 -n 1");InputStream is=process.getInputStream();InputStreamReader isr=new InputStreamReader(is);BufferedReader in=new BufferedReader(isr);String line=in.readLine();while(line!=null){if(line!=null&&!line.equals("")){if(line.substring(0,2).equals("来自")||(line.length()>10&&line.substring(0,10).equals("Reply from"))){pingMap.put(ip,"true");}}line=in.readLine();}}catch(IOException e){}}}}

 

4.网络资源的单线程下载

import javax.swing.*;import org.omg.CORBA_2_3.portable.InputStream;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.FileOutputStream;import java.net.*;public class SingleThreadDownloadFrame extends JFrame{private JTextField tf_address;public static void main(String args[]){EventQueue.invokeLater(new Runnable(){public void run(){try{SingleThreadDownloadFrame frame=new SingleThreadDownloadFrame();frame.setVisible(true);}catch(Exception e){e.printStackTrace();}}});}public SingleThreadDownloadFrame(){super();this.getContentPane().setLayout(null);this.setTitle("网络资源单线程下载");this.setBounds(100,100,500,237);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JLabel label=new JLabel();label.setText("网络资源的网址： ");label.setBounds(10,88,118,18);this.getContentPane().add(label);tf_address=new JTextField();tf_address.setBounds(117,86,357,22);this.getContentPane().add(tf_address);JButton button=new JButton();button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubString address=tf_address.getText().trim();//获得网址  去除空格download(address);System.out.println("开始下载了：  "+address);}});button.setText("单击开始下载");button.setBounds(41,144,145,28);this.getContentPane().add(button);JButton button_1=new JButton();button_1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtf_address.setText(null);tf_address.requestFocus();//文本框获得焦点}});button_1.setText("清   空");button_1.setBounds(204,144,106,28);this.getContentPane().add(button_1);JButton button_2=new JButton();button_2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});button_2.setText("退   出");button_2.setBounds(328,144,106,28);this.getContentPane().add(button_2);JLabel label_1=new JLabel();label_1.setForeground(new Color(0,0,255));label_1.setFont(new Font("",Font.BOLD,24));label_1.setText("网络资源的单线程下载");label_1.setBounds(117,21,301,48);this.getContentPane().add(label_1);}public void download(String urlAddr){try{URL url=new URL(urlAddr);URLConnection urlConn=url.openConnection();//获得连接对象urlConn.connect();java.io.InputStream in=urlConn.getInputStream();String filePath=url.getFile();int pos=filePath.lastIndexOf("/");String fileName=filePath.substring(pos+1);System.out.println("fileName: "+fileName);FileOutputStream out=new FileOutputStream("C:/Users/Administrator/Desktop/"+fileName);byte[] bytes=new byte[1024];int len=in.read(bytes);while(len!=-1){out.write(bytes,0,len);len=in.read(bytes);}out.close();in.close();JOptionPane.showMessageDialog(null, "下载完毕");}catch(Exception e){e.printStackTrace();}}}

5.网络资源的多线程下载

给资源设置断点  分给不同的线程进行下载

MultiThreadDownFrame.java

import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import java.net.HttpURLConnection;import java.net.URL;public class MultiThreadDownFrame extends JFrame{private JTextField tf_address;public static void main(String args[]){EventQueue.invokeLater(new Runnable(){public void run(){try{MultiThreadDownFrame frame=new MultiThreadDownFrame();frame.setVisible(true);}catch(Exception e){e.printStackTrace();}}});}public MultiThreadDownFrame(){super();this.getContentPane().setLayout(null);this.setBounds(100,100,482,189);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JButton button=new JButton();button.setBounds(10,95,106,28);this.getContentPane().add(button);button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtry{String address=tf_address.getText();int pos=address.lastIndexOf("/");String fileName=address.substring(pos+1);download(address,"c:\\"+fileName,2);}catch(Exception e1){e1.printStackTrace();}}});button.setText("下    载");JLabel label=new JLabel();label.setText("网络资源的地址: ");label.setBounds(10,44,106,18);this.getContentPane().add(label);tf_address=new JTextField();tf_address.setBounds(114,42,341,22);this.getContentPane().add(tf_address);JButton button_1=new JButton();button_1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubtf_address.setText(null);}});button_1.setText("清   空");button_1.setBounds(179,95,106,28);this.getContentPane().add(button_1);JButton button_2=new JButton();button_2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});button_2.setText("退   出");button_2.setBounds(349, 95, 106, 28);        getContentPane().add(button_2);}public void download(String url,String dest,int threadNum) throws Exception{URL downURL=new URL(url);HttpURLConnection conn=(HttpURLConnection) downURL.openConnection();//打开网络连接long fileLength=-1;//用于存储文件长度int stateFlagCode=conn.getResponseCode();//获得连接状态标记码if(stateFlagCode==200){fileLength=conn.getContentLength();conn.disconnect();}if(fileLength>0){long byteCounts=fileLength/threadNum+1;//计算每个线程的字节数File file=new File(dest);for(int i=0;i<threadNum;i++){long startPosition=byteCounts*i;long endPosition=byteCounts*(i+1);if(i==threadNum-1){DownMultiThread fileThread=new DownMultiThread(url,file,startPosition,0);new Thread(fileThread).start();}else {DownMultiThread fileThread=new DownMultiThread(url,file,startPosition,endPosition);new Thread(fileThread).start();}}JOptionPane.showMessageDialog(null,"完成网络资源的下载");}}}

DownMultiThread.java

import java.io.*;import java.net.*;import javax.swing.JOptionPane;public class DownMultiThread implements Runnable{private String sUrl="";//网络资源地址private File desFile;//需要写入的目标文件对象private long startPos;//写入的开始位置private long endPos;public DownMultiThread(String sUrl,File desFile,long startPos,long endPos){this.sUrl=sUrl;this.desFile=desFile;this.startPos=startPos;this.endPos=endPos;}@Overridepublic void run() {// TODO Auto-generated method stubtry{URL url=new URL(sUrl);HttpURLConnection conn=(HttpURLConnection)url.openConnection();conn.setRequestProperty("User-Agent", "NetFox");//设置断点续传String rangeProperty="bytes="+startPos+"-";if(endPos>0){rangeProperty="bytes="+startPos+"-"+endPos;}conn.setRequestProperty("RANGE", rangeProperty);RandomAccessFile out=new RandomAccessFile(desFile,"rw");out.seek(startPos);InputStream in=conn.getInputStream();BufferedInputStream bin=new BufferedInputStream(in);byte[] buff=new byte[2048];int len=-1;len=bin.read(buff);while(len!=-1){out.write(buff,0,len);len=bin.read(buff);}out.close();bin.close();conn.disconnect();}catch(Exception e){JOptionPane.showMessageDialog(null, e.getMessage());}}}