Java简单登录图形界面

本文参考与：https://blog.csdn.net/wyf2017/article/details/78831744

https://blog.csdn.net/MengKun822/article/details/89302921

一.登录界面

1.程序代码

 1 import java.awt.*;//导入awt包

 2 import javax.swing.*;//导入swing包

 3 import java.awt.event.ActionListener;//导入awt包中的监听器事件包

 4 import java.awt.event.ActionEvent;//导入awt包中的ActionEvent事件包

 5

 6 public class EnterScreen extends JFrame {

 7     static int s=0;

 8     public EnterScreen() {

 9         Yanzhencode vcode = new  Yanzhencode();

10         setSize(300,290);//设计窗体的大小

11         setTitle("请登录");

12         setBackground(Color.RED);//设置背景颜色

13         JLabel a=new JLabel("登录名"); //实例化JLabel对象

14         JLabel b=new JLabel("密    码");

15         JLabel g=new JLabel("忘记用户名/密码？");

16         JLabel h=new JLabel("验证码");

17         g.setForeground(Color.BLUE);

18         JTextField c=new JTextField(15);//实例化用户名文本框

19         JPasswordField d=new JPasswordField(15);//实例化密码框

20         JTextField k=new JTextField(4);//实例化验证码框

21         d.setEchoChar('*');//将输入密码框中的密码以*显示出来

22         JButton e=new JButton("登录");

23         JButton f=new JButton("快速注册");

24         e.setBackground(Color.YELLOW);//设置登录按钮字体颜色

25         f.setForeground(Color.GRAY);//设置快速登录按钮填充色

26         setVisible(true);//使窗体可视化

27         Container m=getContentPane();//获取一个容器

28         getContentPane().setBackground(Color.WHITE);//设置窗体填充色

29 //        将用户名、密码的Jlabel和用户名JTextField文本框、密码JPasswordField密码框以及确定JButton、快速注册JButton添加到container容器里面                         //

30         m.add(a);

31         m.add(b);

32         m.add(c);

33         m.add(d);

34         m.add(e);

35         m.add(f);

36         m.add(g);

37         m.add(h);

38         m.add(k);

39         m.add(vcode);

40         setBounds(300,300,300,300);//设置窗体的长宽各为300、300  让其显示在左上方的300、300处

41         m.setLayout(null);

42 //        a、b、c、d、e、f显示在container容器中的位置坐标

43         a.setBounds(10,40,50,18);

44         b.setBounds(10,80,50,18);

45         c.setBounds(60,40,130,18);

46         d.setBounds(60,80,130,18);

47         h.setBounds(10,120,50,18);

48         k.setBounds(60,120,80,18);

49         e.setBounds(90,180,100,30);

50         f.setBounds(90,220,100,30);

51         g.setBounds(190,75,100,30);

52         vcode.setBounds(140,110,80,30);

53         e.addActionListener(new ActionListener() {//对登录按钮添加监听事件

54

55             @SuppressWarnings("deprecation")

56             @Override

57             public void actionPerformed(ActionEvent arg0) {

58                 // TODO Auto-generated method stub

59

60                 if(c.getText().trim().equals("xiaoyang")&&new String(d.getPassword()).equals("123456")&&s==1) {//equals函数进行用户名和密码的匹配

61                     JOptionPane.showMessageDialog(null,"登录成功");

62

63                     new NewFrame();//进入到NewFrame这个窗体中

64                 }else if(c.getText().trim().equals("xiaoyang")&&new String(d.getPassword()).equals("123456")&&s==0) {

65                     JOptionPane.showMessageDialog(null,"验证码输入错误");

66                 }else {

67                     JOptionPane.showMessageDialog(null, "登录失败,用户名、密码或验证码输入错误");

68                 }

69             }

70

71         });

72         f.addActionListener(new ActionListener(){//对快速注册按钮添加监听事件

73             @SuppressWarnings("deprecation")

74             @Override

75             public void actionPerformed(ActionEvent arg0) {

76                 // TODO Auto-generated method stub

77                 new zhuce();//进入都到zhuce窗体中

78             }

79

80         });

81         //判断输入验证码是否正确

82             if(k.getText()== null) {

83                 s=0;

84             }else if(vcode.getCode() == null) {

85                 s=1;

86             }else if(vcode.getCode() .equals(k.getText())) {

87                 s=1;

88             }else {

89             s=0;

90         }

91     }

92

93         public static void main(String[] args) {

94             new EnterScreen();

95

96         }

97

98     }

2.登录界面截图

二.快速注册界面

1.程序代码

 1 import java.awt.*;

 2 import javax.swing.*;

 3 import java.awt.event.ActionListener;

 4 import java.awt.event.ActionEvent;

 5 import java.sql.*;

 6 import java.awt.Container;

 7

 8 import javax.swing.JButton;

 9 import javax.swing.JLabel;

10 import javax.swing.JPasswordField;

11 import javax.swing.JTextField;

12

13 public class zhuce extends JFrame {

14     public zhuce() {

15         setSize(300,250);//设计窗体的大小

16         JLabel a=new JLabel("用户名"); //实例化JLabel对象

17         JLabel b=new JLabel("密    码");

18         JLabel h=new JLabel("再次确认密码");

19         JTextField c=new JTextField(15);//实例化用户名文本框

20         JPasswordField d=new JPasswordField(15);//实例化密码文本框

21         JPasswordField hd=new JPasswordField(15);//实例化密码文本框

22         d.setEchoChar('*');//设置密码隐藏制度

23         JButton e=new JButton("确定");

24         JButton f=new JButton("重置");

25         JButton g=new JButton("返回");

26         setVisible(true);

27         //获取一个容器

28         Container m=getContentPane();

29 //        将用户名、密码的Jlabel和用户名JTextField文本框、密码JPasswordField密码框以及确定JButton、快速注册JButton添加到container容器里面

30         m.add(a);

31         m.add(b);

32         m.add(h);

33         m.add(hd);

34         m.add(c);

35         m.add(d);

36         m.add(e);

37         m.add(f);

38         m.add(g);

39         //设置窗体的长宽各为300、250  让其显示在左上方的300、250处

40         setBounds(300,250,300,250);

41         m.setLayout(null);

42 //        a、b、c、d、e、f显示在container容器中的位置坐标

43         a.setBounds(10,40,50,18);

44         b.setBounds(10,80,50,18);

45         h.setBounds(5,120,80,18);

46         c.setBounds(60,40,200,18);

47         d.setBounds(60,80,200,18);

48         hd.setBounds(90,120,180,18);

49         e.setBounds(110,160,60,30);

50         f.setBounds(30,160,60,30);

51         g.setBounds(190,160,60,30);

52         g.addActionListener(new ActionListener() {//对返回按钮添加监听事件

53             @SuppressWarnings("deprecation")

54             @Override

55             public void actionPerformed(ActionEvent arg0) {

56                 // TODO Auto-generated method stub

57                 new EnterScreen();

58

59             }

60            });

61             f.addActionListener(new ActionListener() {//对确认按钮添加监听事件

62                 @SuppressWarnings("deprecation")

63                 @Override

64                 public void actionPerformed(ActionEvent arg0) {

65                     // TODO Auto-generated method stub

66                     new EnterScreen();

67

68                 }

69         });

70             e.addActionListener(new ActionListener() {//对确认按钮添加监听事件

71                 @SuppressWarnings("deprecation")

72                 @Override

73                 public void actionPerformed(ActionEvent arg0) {

74                     // TODO Auto-generated method stub

75                     new zhuce();

76

77                 }

78         });

79     }

80 }

2.快速注册界面截图

三.验证码部分

1.验证码程序

  1 import java.awt.Color;

  2     import java.awt.Dimension;

  3     import java.awt.Font;

  4     import java.awt.FontMetrics;

  5     import java.awt.Graphics;

  6     import java.awt.Graphics2D;

  7     import java.awt.event.MouseEvent;

  8     import java.awt.event.MouseListener;

  9

 10     import java.util.Random;

 11

 12     import javax.swing.JComponent;

 13

 14     public class Yanzhencode  extends JComponent implements MouseListener {

 15

 16         private String codes;  //自动生成的验证码

 17

 18         private int width, height = 40;  //设置验证码高度、宽度

 19

 20         private int codesLength = 4;  //设置代码长度

 21

 22         private Random random = new Random(); //生成数字的方法

 23

 24         public Yanzhencode() {

 25             width = this.codesLength * 16 + (this.codesLength - 1) * 10; //根据验证码长度设置宽度

 26             setPreferredSize(new Dimension(width, height));  //设置背景大小

 27             setSize(width, height);  //设置验证码长度和宽度

 28             this.addMouseListener(this);

 29             setToolTipText("点击可更换验证码");

 30         }

 31       //得到生成的验证码

 32         public int getCodesLength() {

 33             return codesLength;

 34         }

 35

 36

 37         //设置验证码的长度

 38         public void setCodesLength(int codeLength) {

 39             if(codesLength < 4) {

 40                 this.codesLength = 4;

 41             } else {

 42                 this.codesLength = codeLength;

 43             }

 44

 45         }

 46

 47         public String getCode() {

 48             return codes;

 49         }

 50

 51

 52            //让验证码产生随机的颜色

 53         public Color getRandColor(int min, int max) {

 54

 55             if (min > 255)

 56                 min = 255;

 57             if (max > 255)

 58                 max = 255;

 59             int red = random.nextInt(max - min) + min;

 60             int green = random.nextInt(max - min) + min;

 61             int blue = random.nextInt(max - min) + min;

 62             return new Color(red, green, blue);

 63         }

 64            // 设置验证码具体的数字或字母是什么

 65         protected String generateCode() {

 66             char[] codes = new char[this.codesLength];

 67             for (int i = 0, len = codes.length; i < len; i++) {

 68                 if (random.nextBoolean()) {

 69                     codes[i] = (char) (random.nextInt(10) + 48);

 70                 } else {

 71                     codes[i] = (char) (random.nextInt(26) + 97);

 72                 }

 73             }

 74             this.codes = new String(codes);

 75             return this.codes;

 76         }

 77

 78

 79         @Override

 80         protected void paintComponent(Graphics g) {

 81             super.paintComponent(g);

 82             if(this.codes == null || this.codes.length() != this.codesLength) {  //判断生成的验证码是否为空或超出长度

 83                 this.codes = generateCode();

 84             }

 85             width = this.codesLength * 16 + (this.codesLength - 1) * 10;

 86             super.setSize(width, height);  //接口使用，验证码字体大小

 87             super.setPreferredSize(new Dimension(width, height));//接口使用，验证码背景大小

 88             Font mFont = new Font("Arial", Font.BOLD | Font.ITALIC, 25);  //设置字体和字体大小

 89             g.setFont(mFont);  //设置对象

 90             //绘制出验证码的背景的矩形轮廓

 91             Graphics2D g2d = (Graphics2D) g;

 92             g2d.setColor(getRandColor(200, 250));

 93             g2d.fillRect(0, 0, width, height);

 94             g2d.setColor(getRandColor(180, 200));

 95             g2d.drawRect(0, 0, width - 1, height - 1);

 96             //绘制出验证码背景的线

 97             int i = 0, len = 150;

 98             for (; i < len; i++) {

 99                 int x = random.nextInt(width - 1);

100                 int y = random.nextInt(height - 1);

101                 int x1 = random.nextInt(width - 10) + 10;

102                 int y1 = random.nextInt(height - 4) + 4;

103                 g2d.setColor(getRandColor(180, 200));

104                 g2d.drawLine(x, y, x1, y1);

105             }

106

107

108

109             //绘制出验证码的具体字母

110             i = 0; len = this.codesLength;

111             FontMetrics fm = g2d.getFontMetrics();

112             int base = (height - fm.getHeight())/2 + fm.getAscent();

113             for(;i<len;i++) {

114                 int b = random.nextBoolean() ? 1 : -1;

115                 g2d.rotate(random.nextInt(10)*0.01*b);

116                 g2d.setColor(getRandColor(20, 130));

117                 g2d.drawString(codes.charAt(i)+"", 16 * i + 10, base);

118             }

119         }

120

121         //下一个验证码

122         public void nextCode() {

123             generateCode();

124             repaint();

125         }

126

127         @Override

128         public void mouseClicked(MouseEvent e) {

129

130             nextCode();

131         }

132

133         @Override

134         public void mousePressed(MouseEvent e) {

135             // TODO Auto-generated method stub

136

137         }

138

139         @Override

140         public void mouseReleased(MouseEvent e) {

141             // TODO Auto-generated method stub

142

143         }

144

145         @Override

146         public void mouseEntered(MouseEvent e) {

147             // TODO Auto-generated method stub

148

149         }

150

151         @Override

152         public void mouseExited(MouseEvent e) {

153             // TODO Auto-generated method stub

154

155         }

156     }

2.验证码实现效果

点击验证码图片后，验证码会更换

参考自：以java实现的一个简单登录界面（带验证码） - yangliuliu - 开发者的网上家园

巴特西

Java简单登录图形界面

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