验证码登陆（SSH初级整合）

package com.zpark.wzy.util; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.util.Random; import com.sun.image.codec.jpeg.*; public class SecurityImage { /** * 生成验证码图片 * @param securityCode * @return */ public static BufferedImage createImage(String securityCode){ int codeLength = securityCode.length();//验证码长度 int fontSize = 15;//字体大小 int fontWidth = fontSize+1; //图片宽高 int width = codeLength*fontWidth+6; int height = fontSize*2+1; //图片 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.WHITE);//设置背景色 g.fillRect(0, 0, width, height);//填充背景 g.setColor(Color.LIGHT_GRAY);//设置边框颜色 g.setFont(new Font("Arial", Font.BOLD, height-2));//边框字体样式 g.drawRect(0, 0, width-1, height-1);//绘制边框 //绘制噪点 Random rand = new Random(); g.setColor(Color.LIGHT_GRAY); for (int i = 0; i < codeLength*6; i++) { int x = rand.nextInt(width); int y = rand.nextInt(height); g.drawRect(x, y, 1, 1);//绘制1*1大小的矩形 } //绘制验证码 int codeY = height-10; g.setColor(new Color(19,148,246)); g.setFont(new Font("Georgia", Font.BOLD, fontSize)); for(int i=0;i<codeLength;i++){ double deg=new Random().nextDouble()*20; g.rotate(Math.toRadians(deg), i*16+13,codeY-7.5); g.drawString(String.valueOf(securityCode.charAt(i)), i*16+5, codeY); g.rotate(Math.toRadians(-deg), i*16+13,codeY-7.5); } g.dispose();//关闭资源 return image; } /** * 返回验证码图片的流格式 * @param securityCode * @return */ public static ByteArrayInputStream getImageAsInputStream(String securityCode){ BufferedImage image = createImage(securityCode); return convertImageToStream(image); } /** * 将BufferedImage转换成ByteArrayinputStream * @param image * @return */ public static ByteArrayInputStream convertImageToStream(BufferedImage image){ ByteArrayInputStream inputStream = null; ByteArrayOutputStream outStream = new ByteArrayOutputStream(); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream); try { encoder.encode(image); byte[] b = outStream.toByteArray(); inputStream = new ByteArrayInputStream(b); } catch (Exception e) { } return inputStream; } }