java图形界面基础代码,JAVA图形界面

java图形界面代码

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class ReadBook extends JFrame {

JTextArea jta;

JTextField jtf;

JButton jb;

public ReadBook() {

jta = new JTextArea();

jtf = new JTextField(30);

jtf.setText("文件保存路径如c:\\ab.txt");

jb = new JButton("保存文字");

JPanel jp = new JPanel();

jp.add(jtf);

jp.add(jb);

add(jta);

add(jp, BorderLayout.SOUTH);

setBounds(500, 100, 500, 380);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

jb.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

//-------------核心代码---------

String path = jtf.getText();

File f = new File(path);

String txt = jta.getText().replaceAll("\n", "\r\n");

try {

BufferedWriter bw = new BufferedWriter(new FileWriter(f));

bw.write(txt);//写入文件中

bw.close();

} catch (Exception e1) {

e1.printStackTrace();

}

//-------------核心代码---------

}

});

}

public static void main(String[] args) {

new ReadBook();

}

}

Java编写图形用户界面程序

运行如图

参考代码如下

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class RegDemo extends JFrame implements ActionListener{

JTextField jtf;

JPasswordField jpf;

public RegDemo() {

        //组件的创建, 和布局安排

JPanel jpc = new JPanel();//默认流式布局

JPanel jp1 = new JPanel(new GridLayout(2, 2,5,10));//网格布局

jp1.setBorder(BorderFactory.createTitledBorder("用户注册"));

JLabel jl1 = new JLabel("用户名:");

jtf = new JTextField(10);

JLabel jl2 = new JLabel("密码:");

jpf = new JPasswordField(10);

                jpf.setEchoChar('*');//用*号来隐藏密码的显示

jp1.add(jl1);jp1.add(jtf);

jp1.add(jl2);jp1.add(jpf);

jpc.add(jp1);

add(jpc);

JButton jb1 = new JButton("提交");

jb1.addActionListener(this);

jb1.setActionCommand("yes");

JButton jb2 = new JButton("取消");

jb2.addActionListener(this);

jb2.setActionCommand("no");

JPanel jp2 = new JPanel();

jp2.add(jb1);jp2.add(jb2);

add(jp2,BorderLayout.SOUTH);

setTitle("用户注册界面");

        setSize(280, 280);

        setLocationRelativeTo(null);//窗口居中

        setDefaultCloseOperation(EXIT_ON_CLOSE);//

        setVisible(true);

}

public static void main(String[] args) {

new RegDemo();

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getActionCommand().equals("yes")){

String name  = jtf.getText().trim();

String pwd = new String(jpf.getPassword());

if(name.equals("")||pwd.equals("")){

JOptionPane.showMessageDialog(this, "你还没有输入用户名或者密码");

}else{

JOptionPane.showMessageDialog(this, "注册成功!用户名"+name+",密码"+pwd);

}

}else{

jtf.setText("");

jpf.setText("");

}

}

}

Java编写一个图形界面

我觉得还是我的好些。。。

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.io.FileOutputStream;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class TestSwing extends JFrame{

private JLabel label1, label2, label3, label4,label5,label6,label7;

private JPanel panel,panel1,panel2;

private JTextField tField1,tField2,tField3,tField4,tField5,tField6,tField7,tField8,tField9;

private JButton button;

private String filepath="c:\\info.dat";

public TestSwing(){

init();

this.setSize(300, 280);

this.setLocation(

(Toolkit.getDefaultToolkit().getScreenSize().width - this

.getSize().width) / 2,

(Toolkit.getDefaultToolkit().getScreenSize().height - this

.getSize().height) / 2);

this.setResizable(false);

this.setVisible(true);

this.setTitle("info");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void init(){

initPanel();

initLabel();

initTextField();

initButton();

initContent();

}

private void initContent(){

panel1.add(label1);

panel1.add(tField1);

panel1.add(label2);

panel1.add(tField2);

panel1.add(label3);

panel1.add(tField3);

panel1.add(label4);

panel1.add(tField4);

panel1.add(label5);

panel1.add(tField5);

panel1.add(label6);

panel1.add(tField6);

panel1.add(label7);

panel1.add(tField7);

panel1.add(tField8);

panel1.add(tField9);

panel2.add(button);

panel.add(panel1,BorderLayout.CENTER);

panel.add(panel2,BorderLayout.SOUTH);

getContentPane().add(panel);

}

private void initPanel(){

panel = new JPanel();

panel.setLayout(new FlowLayout());

panel.setBackground(Color.WHITE);

panel1 = new JPanel();

GridLayout upLayout = new GridLayout(8, 2);

panel1.setLayout(upLayout);

panel2 = new JPanel();

panel2.setLayout(new FlowLayout());

}

private void initLabel(){

label1 = new JLabel("IP地址", SwingConstants.LEFT);

label2 = new JLabel("端口", SwingConstants.LEFT);

label3 = new JLabel("访问地址", SwingConstants.LEFT);

label4 = new JLabel("XXXXX", SwingConstants.LEFT);

label5 = new JLabel("XXXXX", SwingConstants.LEFT);

label6 = new JLabel("XXXXX", SwingConstants.LEFT);

label7 = new JLabel("XXXXX", SwingConstants.LEFT);

}

private void initTextField(){

tField1 = new JTextField(10);

tField2 = new JTextField(10);

tField3 = new JTextField(10);

tField4 = new JTextField(10);

tField5 = new JTextField(10);

tField6 = new JTextField(10);

tField7 = new JTextField(10);

tField8 = new JTextField(10);

tField9 = new JTextField(10);

}

private void initButton(){

button = new JButton("完成");

button.addMouseListener(new MouseAdapter(){

//左键点击

public void mouseClicked(MouseEvent e) {

String ipv = tField1.getText().trim();

String portv = tField2.getText().trim();

String addrv = tField3.getText().trim();

String xx1v = tField4.getText().trim();

String xx2v = tField5.getText().trim();

String xx3v = tField6.getText().trim();

String xx4v = tField7.getText().trim();

String inputx = tField8.getText().trim();

String inputxv = tField9.getText().trim();

createFile(ipv, portv, addrv, xx1v, xx2v, xx3v, xx4v, inputx, inputxv);

JOptionPane.showMessageDialog(null, "保存成功");

tField1.setText("");

tField2.setText("");

tField3.setText("");

tField4.setText("");

tField5.setText("");

tField6.setText("");

tField7.setText("");

tField8.setText("");

tField9.setText("");

}

});

}

public static void main(String[]args){

new TestSwing();

}

private void createFile(String ipv,String portv ,String addrv,String xx1v,String xx2v,String xx3v,String xx4v,String inputx,String inputxv){

StringBuffer context = new StringBuffer();

context.append("ip=").append(ipv).append("\n");

context.append("port=").append(portv).append("\n");

context.append("addr=").append(addrv).append("\n");

context.append("xx1=").append(xx1v).append("\n");

context.append("xx2=").append(xx2v).append("\n");

context.append("xx3=").append(xx3v).append("\n");

context.append("xx4=").append(xx4v).append("\n");

context.append(inputx).append("=").append(inputxv).append("");

FileOutputStream fos = null;

try {

fos = new FileOutputStream(filepath);

fos.write(context.toString().getBytes());

} catch (Exception e) {

} finally {

if (fos != null)

try {

fos.close();

} catch (Exception e) {

}

}

}

}

java 图形界面

你用的是TextField只能改变长度不能改变宽度的

你可以使用TextArea这个是可以改变宽度的

P.S.用Awt编程不好看 建议用Swing 可能在视觉上要好看一些 不过无所谓

java图形界面代码解惑

一般来说.比较常使用的是 JTextArea文本框的无参数构造器进行构造

然后可以使用setText("文字")来设置文本,或者getText()方法来获得文本

JTextArea jta = new JTextArea();

jta.setText("你好啊");

String txt = jta.getText();

具体例子

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class ReadBook extends JFrame{

JTextArea jta;

JTextField jtf;

JButton jb;

public ReadBook(){

jta = new JTextArea();

jtf = new JTextField(30);

jtf.setText("文件路径如c:\\ab.txt");

jb = new JButton("显示文字");

JPanel jp = new JPanel();

jp.add(jtf);

jp.add(jb);

add(jta);

add(jp,BorderLayout.SOUTH);

setBounds(500, 100, 500, 380);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

jb.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String path = jtf.getText();

File f= new File(path);

if(f.exists()!f.isDirectory()){//存在该文件且不是文件夹

try {

StringBuilder sb = new StringBuilder();

BufferedReader br = new BufferedReader(new FileReader(f));

String temp;

while((temp=br.readLine())!=null){

sb.append(temp+"\n");

}

br.close();

jta.setText(sb.toString());//setText方法可以给jta添加文字

} catch (Exception e1) {

e1.printStackTrace();

}

}else{

jtf.setText("路径错误.重新填写");

}

}

});

}

public static void main(String[] args) {

new ReadBook();

}

}

效果

求一个简单的java代码：（图形界面）

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class vv extends JDialog {

private static final long serialVersionUID = 1L;

private JLabel l_Id = new JLabel("登陆账户", JLabel.CENTER);

private JLabel l_pw = new JLabel("登陆密码", JLabel.CENTER);

private JTextField t_Id = new JTextField(10);

private JPasswordField t_pw = new JPasswordField(10);

private JButton btnLogin;

private JButton btnClose;

public vv() {

super();

setResizable(false);

getContentPane().setBackground(new Color(225, 225, 225));

getContentPane().setLayout(null);

initialize();

}

protected void initialize() {

setTitle("系统登录");

l_Id.setBounds(48, 43, 53, 25);

t_Id.setBounds(110, 43, 150, 25);

l_pw.setBounds(48, 93, 53, 25);

t_pw.setBounds(110, 93, 150, 25);

getContentPane().add(l_Id);

getContentPane().add(l_pw);

getContentPane().add(t_Id);

getContentPane().add(t_pw);

btnLogin = new JButton();

btnLogin.setText("登 录");

btnLogin.setBounds(70, 142, 85, 28);

btnLogin.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

addBtnLoginActionListener();

}

});

getContentPane().add(btnLogin);

btnClose = new JButton();

btnClose.setText("关 闭");

btnClose.setBounds(175, 142, 85, 28);

btnClose.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

dispose();

System.exit(-1);

}

});

getContentPane().add(btnClose);

}

private void addBtnLoginActionListener() {

String user = t_Id.getText();

String password = new String(t_pw.getPassword());

if (user.equals("")) {

JOptionPane.showMessageDialog(this, "帐号不可为空", "Caution",

JOptionPane.WARNING_MESSAGE);

return;

}

if (password.equals("")) {

JOptionPane.showMessageDialog(this, "密码不可为空", "Caution",

JOptionPane.WARNING_MESSAGE);

return;

}

String sql = "select * FROM login WHERE id = '" + user + "' and pw = '"

+ password + "'";

boolean success = false;

// TODO:数据校验 success = executeQuery(sql);

if (success) {

// TODO： 如果数据校验成功 显示主界面 并关闭登录界面

JOptionPane.showMessageDialog(this, "成功登录", "提示",

JOptionPane.INFORMATION_MESSAGE);

this.dispose();

} else {

JOptionPane.showMessageDialog(this, "帐号或密码错误!", "警告",

JOptionPane.WARNING_MESSAGE);

t_pw.requestFocus(); // 密码框选中

}

}

public Dimension getPreferredSize() {

return new Dimension(320, 170);

}

public void show() {

Toolkit tk = Toolkit.getDefaultToolkit();

Dimension screen = tk.getScreenSize();

Dimension d = getSize();

this.setLocation((screen.width - d.width) / 2,

(screen.height - d.height) / 2);

// 输入密码后回车相当于点击了登录按钮

getRootPane().setDefaultButton(btnLogin);

t_pw.requestFocus();

setDefaultCloseOperation(DISPOSE_ON_CLOSE);

setSize(300, 220);

super.show();

}

public static void main(String[] args) {

vv loginFrame = new vv();

loginFrame.setVisible(true);

}

}

希望对你有帮助