java swing中登录界面验证码的实现。

Posted 2023-04-04

public class ValidCode extends JComponent implements MouseListener   

private String code;  

private int width, height = 40;  

private int codeLength = 4;  

private Random random = new Random();  

public ValidCode()   

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

setPreferredSize(new Dimension(width, height));  

setSize(width, height);  

this.addMouseListener(this);  

setToolTipText("点击可以更换验证码");  

  

public int getCodeLength()   

return codeLength;  

  

/* 

设置验证码文字的长度 

*/  

public void setCodeLength(int codeLength)   

if(codeLength < 4)   

this.codeLength = 4;  

else   

this.codeLength = codeLength;  

  

  

public String getCode()   

return code;  

  

/* 

产生随机的颜色 

*/  

public Color getRandColor(int min, int max)   

if (min > 255)  

min = 255;  

if (max > 255)  

max = 255;  

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

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

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

return new Color(red, green, blue);  

  

/* 

设置验证码具体的字母是什么 

*/  

protected String generateCode()   

char[] codes = new char[this.codeLength];  

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

if (random.nextBoolean())   

codes[i] = (char) (random.nextInt(26) + 65);  

else   

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

  

  

this.code = new String(codes);  

return this.code;  

  

@Override  

protected void paintComponent(Graphics g)   

super.paintComponent(g);  

if(this.code == null || this.code.length() != this.codeLength)   

this.code = generateCode();  

  

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

super.setSize(width, height);  

super.setPreferredSize(new Dimension(width, height));  

Font mFont = new Font("Arial", Font.BOLD | Font.ITALIC, 25);  

g.setFont(mFont);  

//绘制出验证码的背景的矩形轮廓  

Graphics2D g2d = (Graphics2D) g;  

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

g2d.fillRect(0, 0, width, height);  

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

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

//绘制出验证码背景的线  

int i = 0, len = 150;  

for (; i < len; i++)   

int x = random.nextInt(width - 1);  

int y = random.nextInt(height - 1);  

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

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

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

g2d.drawLine(x, y, x1, y1);  

  

/*i = 0; len = 300; 

for (; i < len; i++)  

int x = random.nextInt(width); 

int y = random.nextInt(height); 

g2d.setColor(getRandColor(150, 180)); 

g2d.drawRect(x, y, 0, 0); 

*/  

//绘制出验证码的具体字母  

i = 0; len = this.codeLength;  

FontMetrics fm = g2d.getFontMetrics();  

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

for(;i<len;i++)   

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

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

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

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

  

  

//下一个验证码  

public void nextCode()   

generateCode();  

repaint();  

  

@Override  

public void mouseClicked(MouseEvent e)   

nextCode();  

  

@Override  

public void mousePressed(MouseEvent e)   

// TODO Auto-generated method stub  

  

@Override  

public void mouseReleased(MouseEvent e)   

// TODO Auto-generated method stub  

  

@Override  

public void mouseEntered(MouseEvent e)   

// TODO Auto-generated method stub  

  

@Override  

public void mouseExited(MouseEvent e)   

// TODO Auto-generated method stub  

  

  

参考技术A 上面的骗人，财富值扣了，结果东西还不存在~~~~
呜~

在java swing中如何实现不同的用户身份登录之后显示不同的界面

在登录界面加一个判断语句，根据判断得到的返回值，决定显示哪个窗体就可以~~ 参考技术A 先创建几个不同窗体嘛。然后相应的打开不同的窗体。 参考技术B 这是分配给用户的权限不同