正文
java普通界面代码 java简单界面
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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
相关问答
Q1: 求java编写的登陆界面代码
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.GridBagLayout;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
public class LoginFrame {
private JFrame jFrame = null; // @jve:decl-index=0:visual-constraint="293,25"
private JPanel jContentPane = null;
private JPanel jPanel = null;
private JLabel jLabel = null;
private JLabel jLabel1 = null;
private JTextField jTextField = null;
private JTextField jTextField1 = null;
private JButton jButton = null;
/**
* This method initializes jFrame
*
* @return javax.swing.JFrame
*/
private JFrame getJFrame() {
if (jFrame == null) {
jFrame = new JFrame();
jFrame.setSize(new Dimension(330, 222));
jFrame.setTitle("登陆");
jFrame.setContentPane(getJContentPane());
}
return jFrame;
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(getJPanel(), null);
}
return jContentPane;
}
/**
* This method initializes jPanel
*
* @return javax.swing.JPanel
*/
private JPanel getJPanel() {
if (jPanel == null) {
jLabel1 = new JLabel();
jLabel1.setBounds(new Rectangle(45, 76, 54, 22));
jLabel1.setText("密 码：");
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(47, 39, 53, 25));
jLabel.setText("用户名：");
jPanel = new JPanel();
jPanel.setLayout(null);
jPanel.setBounds(new Rectangle(2, 7, 305, 167));
jPanel.add(jLabel, null);
jPanel.add(jLabel1, null);
jPanel.add(getJTextField(), null);
jPanel.add(getJTextField1(), null);
jPanel.add(getJButton(), null);
}
return jPanel;
}
/**
* This method initializes jTextField
*
* @return javax.swing.JTextField
*/
private JTextField getJTextField() {
if (jTextField == null) {
jTextField = new JTextField();
jTextField.setBounds(new Rectangle(106, 40, 154, 24));
}
return jTextField;
}
/**
* This method initializes jTextField1
*
* @return javax.swing.JTextField
*/
private JTextField getJTextField1() {
if (jTextField1 == null) {
jTextField1 = new JTextField();
jTextField1.setBounds(new Rectangle(105, 76, 154, 23));
}
return jTextField1;
}
/**
* This method initializes jButton
*
* @return javax.swing.JButton
*/
private JButton getJButton() {
if (jButton == null) {
jButton = new JButton();
jButton.setBounds(new Rectangle(187, 103, 66, 25));
jButton.setText("登陆");
}
return jButton;
}
}
Q2: java求一个简单界面
调用"关于我们"界面的登陆界面代码：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class DL extends JFrame implements ActionListener{
JPanel jp=new JPanel();
JButton jb=new JButton("关于");
DL(){
super("登陆");
jp.add(jb);
jb.addActionListener(this);
getContentPane().add(jp);
setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==jb){
new GY(this);
}
}
public static void main(String[] args) {
new DL();
}
}
"关于我们"界面（这是一个有模式对话框，就是此窗口关闭前，无法操作其父窗口）
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class GY extends JDialog{
JLabel jl=new JLabel("关于我们",JLabel.CENTER);
GY(JFrame dl){
super(dl,"关于我们",true);
getContentPane().add(jl);
setSize(300, 300);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
}
运行结果：
Q3: 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();
}
}
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