实现原理:使用BufferedImage对象的Graphics来进行绘制,然后输出成一张图片进行保存
实现代码及详解:
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public class validateCode{
private static Random rand = new Random();
public static void main(String[] args){
int val1 = rand.nextInt( 9 );
int val2 = rand.nextInt( 9 );
int val3 = rand.nextInt( 9 );
int val4 = rand.nextInt( 9 );
String val = val1 + " " + val2 + " " + val3 + " " + val4'
BufferedImage buf = drawImage(val);
//将最终的图片保存到D://cheng.png下
ImageIO.write(buf, "png" , new File( "D://cheng.png" );
}
public static BufferedImage drawImage(String code){
int height = 30 ;
int width = 60 ;
BufferedImage buf = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics2D gs = buf.createGraphics();
gs.setBackground(Color.black);
gs.drawRect( 0 , 0 ,width,height);
//绘制随机干扰线
int total = 100 ;
drawRandLine(gs,total);
//绘制验证码
Font font = new Font( "行楷" ,Font.BOLD, 20 );
gs.setFont(font);
gs.setColor(getRandColor( 155 , 255 ));
gs.drawString(code, 5 , 20 );
return buf;
}
public static void drawRandLine(Graphics2D gs, int total){
for ( int i= 0 ; i<total; i++){
int x1 = rand.nextInt(width);
int x2 = rand.nextInt(width);
int y1 = rand.nextInt(height);
int y2 = rand.nextInt(height);
//设置随机颜色
gs.setColor(getRandColor( 0 , 155 ));
gs.drawLine(x1,y1,x2,y2);
}
}
public static Color getRandColor( int from, int to){
int r = from + rand.nextInt(to-from);
int g = from + rand.nextInt(to-from);
int b = from + rand.nextInt(to-from);
return new Color(r,g,b);
}
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最终实现效果图
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原文链接:http://blog.csdn.net/qq_27905183/article/details/69945770