利用java的管道重定義。核心代碼如下，剩下自己組織
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Process process = Runtime.getRuntime().exec("cmd");
PrintWriter out = new PrintWriter(process.getOutputStream());
String cmd ; //你的cmd命令
InputStream is = process.getInputStream() //cmd返回出來的信息
out.println(cmd); //輸入你的命令
out.flush(); //寫到控制臺
JAVA彈窗,有下面常見的2種方法實(shí)現(xiàn):
通過JDialog(模式窗口) 類來實(shí)現(xiàn).里面的寫法類似JFrame
重點(diǎn)方法提示:?setModal(true);
//當(dāng)設(shè)置為true表示,如果不關(guān)閉這個(gè)彈窗,那么主界面的其他組件都無法操作,該彈窗置于其他窗口的前面
//當(dāng)設(shè)置為false表示,可以繞開本彈窗,對主界面的其他組件進(jìn)行操作
優(yōu)點(diǎn): 功能強(qiáng)大, ?擴(kuò)展性強(qiáng)
缺點(diǎn): 代碼量大.
示例圖
通過JOptionPane(提示框) 來實(shí)現(xiàn)
效果圖如下
優(yōu)點(diǎn): 代碼量少,簡單,方便, 普通場景已經(jīng)夠用
缺點(diǎn): 擴(kuò)展性不夠, 復(fù)雜邏輯難以實(shí)現(xiàn).
下面寫一個(gè)具體案例
場景:當(dāng)用于對文本域的文字,進(jìn)行操作后,那么退出時(shí),提示用戶, 是否要保存已經(jīng)更改后的內(nèi)容. ?如果用戶沒有修改內(nèi)容,那么不用提示
重點(diǎn)代碼
addDocumentListener--用于實(shí)現(xiàn)對文本內(nèi)容發(fā)生改變時(shí)進(jìn)行響應(yīng)
addWindowListener---用于實(shí)現(xiàn)對窗口進(jìn)行操作時(shí)進(jìn)行響應(yīng)
完整代碼如下
import?java.awt.Font;
import?java.awt.event.*;
import?javax.swing.*;
import?javax.swing.event.*;
public?class?JDDemo?extends?JFrame?implements?DocumentListener,WindowListener{
JTextArea?jta;
boolean?flag;
public?JDDemo()?{
jta?=?new?JTextArea();//文本域
jta.setText("床前明月光");//文本域的文字--可以通過IO加載txt文檔的文字
jta.setFont(new?Font("宋體",Font.BOLD,?20));//文本域的字體
jta.setLineWrap(true);//設(shè)置自動換行
jta.getDocument().addDocumentListener(this);//添加文檔變化事件的響應(yīng).比如修改,刪除等
JScrollPane?jsp?=?new?JScrollPane(jta);//滾動面板(當(dāng)文字太多時(shí),顯示滾動條)
add(jsp);
setTitle("主窗口");//標(biāo)題
setSize(300,?260);//大小
setLocationRelativeTo(null);//居中
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);//點(diǎn)擊窗口的關(guān)閉按鈕時(shí),執(zhí)行windowClosing的代碼
addWindowListener(this);
setVisible(true);//窗口可見
}
public?static?void?main(String[]?args)?{
new?JDDemo();
}
//實(shí)現(xiàn)WindowListener接口,需要重寫下面的6個(gè)方法,?windowClosing專門處理關(guān)閉時(shí)的方法
public?void?windowOpened(WindowEvent?e)?{
}
public?void?windowClosing(WindowEvent?e)?{
if(flag){
int?n?=?JOptionPane.showConfirmDialog(null,?"已經(jīng)更改了內(nèi)容,需要保存后再退出嗎?",?"提示",JOptionPane.YES_NO_OPTION);
//n等于-1表示關(guān)閉了彈出的對話框等情況的默認(rèn)值
//n等于0(JOptionPane.YES_OPTION)表示選擇了Yes
//n等于1(JOptionPane.NO_OPTION)表示選擇了No
if(n==JOptionPane.YES_OPTION){
//把文字保存到文件的代碼省略...
System.out.println("正在使用IO進(jìn)行保存..ing");
closeFrame();//關(guān)閉窗口并退出
}else?if(n==JOptionPane.NO_OPTION){
System.out.println("放棄保存修改.馬上退出");
closeFrame();
}
}else{
closeFrame();
}
}
public?void?windowClosed(WindowEvent?e)?{
}
public?void?windowIconified(WindowEvent?e)?{
}
public?void?windowDeiconified(WindowEvent?e)?{
}
public?void?windowActivated(WindowEvent?e)?{
}
public?void?windowDeactivated(WindowEvent?e)?{
}
//文檔事件,有下面三個(gè),如果觸發(fā)其中一個(gè),都可以認(rèn)為修改了文檔,所以需要在退出時(shí)進(jìn)行提示,是否保存
public?void?insertUpdate(DocumentEvent?e)?{//插入
flag=true;
}
public?void?removeUpdate(DocumentEvent?e)?{//刪除
flag=true;
}
public?void?changedUpdate(DocumentEvent?e)?{//改變
flag=true;
}
//關(guān)閉窗口的方法
public?void?closeFrame(){
this.setVisible(false);//窗口不可見
this.dispose();//窗口銷毀
System.exit(0);//JVM虛擬機(jī)退出
}
}
運(yùn)行效果圖:
話說網(wǎng)上真的好多啊...
package client;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class ClientFrame extends JFrame{
private JTextArea allmsg;
private JTextField welcome,copyright,chatmsg;
private JButton send;
private JScrollPane js;
private boolean isConnected = true;
public DataOutputStream out;
public DataInputStream in;
public Socket s = null;
String nic; /* -- 保存用戶昵稱 --*/
/**
* 初始化客戶端資源
* 1.獲取從LoginFrame傳遞過來的參數(shù)
* 2.初始化界面元素
* 3.初始化通信所需要的資源 EG：輸入/輸出流(DataInputStream/DataOutputStream)
* */
public ClientFrame(String name,Socket socket)
{
this.setSize(310,660);
this.setLocation(290,50);
this.setTitle("聊天室客戶端"+name+"");/* -- 指定窗口的標(biāo)題 --*/
this.s = socket;/* -- 接收從LoginFrame中傳遞過來的Socket --*/
this.nic = name+" 說： ";
welcome = new JTextField(" "+name+" 歡迎您來到聊天室 ",100);
welcome.setBackground(Color.blue);
welcome.setEnabled(false);
copyright = new JTextField(" ----- all copyright @ TOP-king -----");
copyright.setEnabled(false);
allmsg = new JTextArea();
allmsg.setEditable(false);
allmsg.append(" 系統(tǒng)消息: 歡迎登錄在線聊天室 \n");
js = new JScrollPane(allmsg);//為JTextArea添加滾動條
chatmsg = new JTextField("在此輸入聊天信息");
chatmsg.addActionListener(new listen());
send = new JButton("發(fā)送");
send.addActionListener(new listen());/* -- 添加事件監(jiān)聽器 --*/
try {
out = new DataOutputStream(s.getOutputStream());
in = new DataInputStream(s.getInputStream());
} catch (IOException e) {JOptionPane.showMessageDialog(null, "系統(tǒng)異常","錯(cuò)誤",JOptionPane.OK_CANCEL_OPTION);}
addcomponettocontainer();
/* -- 當(dāng)用戶關(guān)閉窗口時(shí)進(jìn)行相關(guān)的處理 eg:Socket Data(Input/Output)Stream 的關(guān)閉--*/
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we)
{
sendmsg("quitlogout");/* -- 向服務(wù)器端發(fā)送關(guān)閉信息 --*/
isConnected = false;
destory();/* -- 銷毀窗口資源 --*/
}
});
new Thread(new linread()).start();/* -- 啟動讀取信息線程 --*/
}
public void addcomponettocontainer()
{
Container c = this.getContentPane();
c.setLayout(null);
welcome.setBounds(75,10,150,20);
js.setBounds(10,50,280,500);
chatmsg.setBounds(10,560,180,30);
send.setBounds(220,560,70,30);
copyright.setBounds(10,600,280,20);
c.add(welcome);
c.add(js);
c.add(chatmsg);
c.add(send);
c.add(copyright);
this.setVisible(true);
this.setResizable(false);
}
class listen implements ActionListener
{
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==send||e.getSource()==chatmsg)
{
String msg = chatmsg.getText().trim();
if("".equals(msg))
{
JOptionPane.showMessageDialog(null,"發(fā)送信息不能為空!","錯(cuò)誤",JOptionPane.OK_OPTION);
}
else
{sendmsg((new Date()).toLocaleString()+"\n"+nic+msg+"\n");chatmsg.setText("");}
}
}
}
/* -- 向服務(wù)器端發(fā)送信息 --*/
public void sendmsg(String m)
{
if(isConnected)//如果socket的輸出流沒關(guān)閉
{
try {
out.writeUTF(m);
} catch (IOException e) {
JOptionPane.showMessageDialog(null,"發(fā)送信息失敗!(系統(tǒng)異常)","錯(cuò)誤",JOptionPane.OK_OPTION);
}
}
else
{
JOptionPane.showMessageDialog(null,"發(fā)送信息失敗!(服務(wù)器關(guān)閉/網(wǎng)絡(luò)故障)","錯(cuò)誤",JOptionPane.OK_OPTION);
}
}
/* -- 讀取信息線程 --*/
class linread implements Runnable
{
public void run()
{
read();
}
public void read()
{
while(isConnected)
{
try {
String msg = in.readUTF();
if("SYSTEM_CLOSED".equals(msg))
{
JOptionPane.showMessageDialog(null,"讀取消息失敗(服務(wù)器關(guān)閉/網(wǎng)絡(luò)故障)！","錯(cuò)誤",JOptionPane.OK_OPTION);
isConnected = false;
}
else
allmsg.append(msg+"\n");
} catch (IOException e) {
}
}//end while
JOptionPane.showMessageDialog(null,"讀取消息失敗(服務(wù)器關(guān)閉/網(wǎng)絡(luò)故障)！","錯(cuò)誤",JOptionPane.OK_OPTION);
}//end read()
}
public void destory()
{
try {
this.out.close();
this.in.close();
this.s.close();
} catch (IOException e) {
}
this.dispose();
}
}
======================================================
package client;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class LoginFrame extends JFrame{
private JTextField name;
private JTextField ip;
private JButton ok,cancle;
public Socket socket;
public LoginFrame()
{
super("登錄框");
this.setSize(400,80);
this.setLocation(100,100);
name = new JTextField("昵稱");
ip = new JTextField("127.0.0.1");
ok = new JButton("登錄");
cancle = new JButton("取消");
ok.addActionListener(new listenEvent());
cancle.addActionListener(new listenEvent());
//建立容器
addcomponettocontainer();
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
/**
* 建立容器及控件
*/
public void addcomponettocontainer()
{
Container c = this.getContentPane();
c.setLayout(null);
name.setBounds(10,10,100,30);
ip.setBounds(120,10,100,30);
ok.setBounds(230,10,70,30);
cancle.setBounds(310,10,70,30);
c.add(name);
c.add(ip);
c.add(ok);
c.add(cancle);
this.setVisible(true);
this.setResizable(false);
}
public class listenEvent implements ActionListener
{
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
if(event.getSource()==ok)
{
String n = name.getText().trim();
String i = ip.getText().trim();
if("".equals(n)||"".equals(i))
{
JOptionPane.showMessageDialog(null,"昵稱、IP不能夠?yàn)榭?","錯(cuò)誤",JOptionPane.OK_OPTION);
}
else{login(n,i);}
}
if(event.getSource()==cancle)
{
name.setText("");
ip.setText("");
}
}
}
/**
* 進(jìn)行登錄
* @param name
* @param ip
*/
public void login(String name,String ip)
{
try {
socket = new Socket(ip,7777);
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
out.writeUTF(name);
out.flush();//強(qiáng)制輸出緩存中的內(nèi)容
//out.close();
new ClientFrame(name,socket);
destroywindow();
} catch (UnknownHostException e) {
JOptionPane.showMessageDialog(null,"找不到主機(jī)地址(IP錯(cuò)誤/網(wǎng)絡(luò)故障)！","錯(cuò)誤",JOptionPane.OK_OPTION);
} catch (IOException e) {
}
}
public void destroywindow()
{
this.dispose();
}
public static void main(String[] args)
{
new LoginFrame();
}
}
==================================================
package server;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class ServerFrame extends JFrame{
/**
*
*/
private static final long serialVersionUID = 1L;
private JTextArea allmsg;
private JTextField currnum,totalnum,copyright,chatmsg;
private JButton send;
private JScrollPane js;
int num1,num2,port;/* -- num1:當(dāng)前在線人數(shù) num2:總上線人數(shù) port:服務(wù)端口號 --*/
private ServerSocket ss;
ArrayListuser lists;//存放所有在線用戶
public ServerFrame()
{
super("聊天室服務(wù)器端");
this.setSize(310,660);
this.setLocation(200,50);
lists = new ArrayListuser();
num1 = num2 =0;
port = 7777;
currnum = new JTextField(" 當(dāng)前在線人數(shù)： "+num1);
currnum.setEnabled(false);
totalnum = new JTextField(" 上線總?cè)藬?shù)： "+num2);
totalnum.setEnabled(false);
copyright = new JTextField(" ----- all copyright @ TOP-king -----");
copyright.setEnabled(false);
allmsg = new JTextArea();
allmsg.append(" --------------- 系統(tǒng)消息 --------------\n");
allmsg.setEditable(false);
allmsg.setLineWrap(true); //允許自動換行
js = new JScrollPane(allmsg);//為JTextArea添加滾動條
chatmsg = new JTextField("在此輸入系統(tǒng)信息");
chatmsg.addActionListener(new ActionListener(){
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent arg0) {
String str = chatmsg.getText().trim();
if(!"".equals(str))
{sendmsg((new Date()).toLocaleString()+" -- 系統(tǒng)消息： "+str);chatmsg.setText("");}
else
JOptionPane.showMessageDialog(null, "消息不能為空","錯(cuò)誤",JOptionPane.OK_OPTION);
chatmsg.setText("");/* -- 發(fā)送信息后，將輸入欄中的信息清空 -- */
}
});
send = new JButton("發(fā)送");
send.addActionListener(new ActionListener(){
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent arg0) {
String str = chatmsg.getText().trim();
if(!"".equals(str))
{sendmsg((new Date()).toLocaleString()+" -- 系統(tǒng)消息： "+str);chatmsg.setText("");}
else
JOptionPane.showMessageDialog(null, "消息不能為空","錯(cuò)誤",JOptionPane.OK_OPTION);
chatmsg.setText("");/* -- 發(fā)送信息后，將輸入欄中的信息清空 -- */
}
});
//建立容器
addcomponettocontainer();
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we)
{
sendmsg("SYSTEM_CLOSED");/* -- 向客戶端發(fā)送服務(wù)器關(guān)閉信息 -- */
destory();
}
});
start(); /* -- 啟動連接服務(wù) -- */
}
public void addcomponettocontainer()
{
//Container建立容器
Container c = this.getContentPane();
c.setLayout(null);
currnum.setBounds(20,15,130,20);
totalnum.setBounds(155,15,125,20);
js.setBounds(10,50,280,500);
chatmsg.setBounds(10,560,180,30);
send.setBounds(220,560,70,30);
copyright.setBounds(10,600,280,20);
c.add(currnum);
c.add(totalnum);
c.add(js);
c.add(chatmsg);
c.add(send);
c.add(copyright);
this.setVisible(true);
this.setResizable(false);
}
/**
* start()方法監(jiān)聽客戶的連接
* 并且保存客戶端的相關(guān)信息EG：用戶昵稱、用戶所使用的Socket
* 用戶連接到服務(wù)器成功之后，將其保存到用戶列表中，并為該用戶啟動一個(gè)線程用于通信 */
@SuppressWarnings("deprecation")
public void start()
{
boolean isStarted = false;/* -- 用于標(biāo)記服務(wù)器是否已經(jīng)正常啟動 -- */
try {
this.ss = new ServerSocket(port);
isStarted = true;
this.allmsg.append((new Date()).toLocaleString()+" 服務(wù)器啟動 @ 端口: "+port+"\n");
while(isStarted)
{
Socket client = this.ss.accept(); /* -- 監(jiān)聽客戶端的連接 -- */
DataInputStream in = new DataInputStream(client.getInputStream());
String name = in.readUTF();
user u = new user();
u.name = name;
u.socket = client;
lists.add(u); //將該用戶加到列表中去
num1++;
num2++;
currnum.setText(" 當(dāng)前在線人數(shù)： "+num1);
totalnum.setText(" 上線總?cè)藬?shù)： "+num2);
this.allmsg.append((new Date()).toLocaleString()+" : "+u.name+" 登錄 \n");
new Thread(new ClientThread(u)).start();/* -- 為該用戶啟動一個(gè)通信線程 -- */
}
} catch (IOException e) {
System.out.println("服務(wù)器已經(jīng)啟動......");
System.exit(0);
}
}
/**
* 通信線程主要功能包括：
* 1.監(jiān)聽客戶端輸入的信息
* 2.將接收到的信息轉(zhuǎn)發(fā)給其他用戶 */
class ClientThread implements Runnable
{
user user = null;
boolean isConnected = true;
DataInputStream dis = null;
DataOutputStream dos = null;
public ClientThread(user u)
{
this.user = u;
try {
this.dis = new DataInputStream(this.user.socket.getInputStream());
this.dos = new DataOutputStream(this.user.socket.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void run()
{
readmsg();
}
/* -- 讀取客戶的聊天信息 -- */
@SuppressWarnings("deprecation")
public void readmsg()
{
while(isConnected)
{
try {
String msg = dis.readUTF();
if("quitlogout".equals(msg))//當(dāng)用戶關(guān)閉客戶端窗口時(shí)，發(fā)送quit字符串 表示用戶已經(jīng)退出
{
num1--;
try{
this.dis.close();
this.dos.close();
this.user.socket.close();
this.isConnected = false;
}catch(IOException ioe)
{
ioe.printStackTrace();
}finally{
this.isConnected = false;
if(dis!=null) this.dis.close();
if(dos!=null) this.dos.close();
if(this.user.socket!=null) this.user.socket.close();
}
lists.remove(this.user);//從列表中刪除該用戶
currnum.setText(" 當(dāng)前在線人數(shù)： "+num1);
allmsg.append((new Date()).toLocaleString()+" : "+this.user.name+" 退出\n");
}
else
sendmsg(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/* -- 將信息進(jìn)行轉(zhuǎn)發(fā) -- */
public void sendmsg(String msg)
{
user us = new user();
DataOutputStream os = null;
if(lists.size()0)
{
for(int i=0;ilists.size();i++)
{
us = lists.get(i);
try {
os = new DataOutputStream(us.socket.getOutputStream());
os.writeUTF(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}
else
JOptionPane.showMessageDialog(null, "當(dāng)前無用戶在線。發(fā)送消息失敗","失敗",JOptionPane.OK_OPTION);
}
public void destory()
{
try {
this.ss.close();
} catch (IOException e) {
e.printStackTrace();
}
this.dispose();
}
public static void main(String[] args)
{
new ServerFrame();
}
}
=================================================
package server;
import java.net.*;
public class user {
String name;
Socket socket;
}
寫了一個(gè)很簡單的案例,可以參考和修改
import?java.awt.BorderLayout;
import?java.awt.GridLayout;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?javax.swing.JButton;
import?javax.swing.JDialog;
import?javax.swing.JFrame;
import?javax.swing.JLabel;
import?javax.swing.JTextField;
public?class?FromeDemo?extends?JFrame{
JButton?jbutton;
public?FromeDemo()?{
jbutton?=?new?JButton("彈出2個(gè)文本框");
jbutton.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
JDialog?jd?=?new?JDialog();
jd.setBounds(320,?180,?260,?100);
jd.setTitle("彈出文本框");
jd.getContentPane().setLayout(new?GridLayout(2,?2));
jd.add(new?JLabel("文本框一"));
jd.add(new?JTextField(80));
jd.add(new?JLabel("文本框二"));
jd.add(new?JTextField(80));
jd.setModal(true);//確保彈出的窗口在其他窗口前面
jd.setVisible(true);
}
});
add(jbutton,BorderLayout.SOUTH);
setBounds(300,?100,?320,?320);
setTitle("測試");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public?static?void?main(String?args[])?{
new?FromeDemo();
}
}
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重慶分公司
