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960天前import java.awt.Color; |
import java.awt.Font; |
import java.awt.Graphics; |
import java.awt.image.BufferedImage; |
import java.util.Random; |
import javax.imageio.ImageIO; |
import javax.servlet.http.HttpServletRequest; |
import javax.servlet.http.HttpServletResponse; |
import javax.servlet.http.HttpSession; |
public class RandomValidateCode { |
public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";//放到session中的key |
private Random random = new Random(); |
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生的字符串 |
|
private int width = 80;//图片宽 |
private int height = 26;//图片高 |
private int lineSize = 40;//干扰线数量 |
private int stringNum = 4;//随机产生字符数量 |
/* |
* 获得字体 |
*/ |
private Font getFont(){ |
return new Font("Fixedsys",Font.CENTER_BASELINE,18); |
} |
/* |
* 获得颜色 |
*/ |
private Color getRandColor(int fc,int bc){ |
if(fc > 255) |
fc = 255; |
if(bc > 255) |
bc = 255; |
int r = fc + random.nextInt(bc-fc-16); |
int g = fc + random.nextInt(bc-fc-14); |
int b = fc + random.nextInt(bc-fc-18); |
return new Color(r,g,b); |
} |
/** |
* 生成随机图片 |
*/ |
public void getRandcode(HttpServletRequest request, |
HttpServletResponse response) { |
HttpSession session = request.getSession(); |
//BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类 |
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR); |
Graphics g = image.getGraphics();//产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作 |
g.fillRect(0, 0, width, height); |
g.setFont(new Font("Times New Roman",Font.ROMAN_BASELINE,18)); |
g.setColor(getRandColor(110, 133)); |
//绘制干扰线 |
for(int i=0;i<=lineSize;i++){ |
drowLine(g); |
} |
//绘制随机字符 |
String randomString = ""; |
for(int i=1;i<=stringNum;i++){ |
randomString=drowString(g,randomString,i); |
} |
session.removeAttribute(RANDOMCODEKEY); |
session.setAttribute(RANDOMCODEKEY, randomString); |
System.out.println(randomString); |
g.dispose(); |
try { |
ImageIO.write(image, "JPEG", response.getOutputStream());//将内存中的图片通过流动形式输出到客户端 |
} catch (Exception e) { |
e.printStackTrace(); |
} |
} |
/* |
* 绘制字符串 |
*/ |
private String drowString(Graphics g,String randomString,int i){ |
g.setFont(getFont()); |
g.setColor(new Color(random.nextInt(101),random.nextInt(111),random.nextInt(121))); |
String rand = String.valueOf(getRandomString(random.nextInt(randString.length()))); |
randomString +=rand; |
g.translate(random.nextInt(3), random.nextInt(3)); |
g.drawString(rand, 13*i, 16); |
return randomString; |
} |
/* |
* 绘制干扰线 |
*/ |
private void drowLine(Graphics g){ |
int x = random.nextInt(width); |
int y = random.nextInt(height); |
int xl = random.nextInt(13); |
int yl = random.nextInt(15); |
g.drawLine(x, y, x+xl, y+yl); |
} |
/* |
* 获取随机的字符 |
*/ |
public String getRandomString(int num){ |
return String.valueOf(randString.charAt(num)); |
} |
} |
