JSP中生成验证码图片
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package myBean;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
public class ImageEnsure ...{
private char mapTable[] = ...{ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9' };
/**//*
* 在os中输出一个大小为width,height的图片
*
*/
public String getEnsure(int width, int height, OutputStream os) ...{
if (width <= 0)
width = 60;
if (height <= 0)
height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
//画背景
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
//画边框
g.setColor(Color.BLACK);
g.drawRect(0, 0, width - 1, height - 1);
String strEnsure = "";
//生成4位验证码
for (int i = 0; i < 4; ++i) ...{
strEnsure += mapTable[(int) (mapTable.length * Math.random())];
}
// 将验证码画到图片中
g.setColor(Color.BLACK);
g.setFont(new Font("Atlantic Inline", Font.PLAIN, 10));
String str = strEnsure.substring(0);
g.drawString(str, 8, 17);
str = strEnsure.substring(1, 2);
g.drawString(str, 20, 15);
str = strEnsure.substring(2, 3);
g.drawString(str, 35, 18);
str = strEnsure.substring(3, 4);
g.drawString(str, 45, 15);
// 随机产生100个干扰点
Random rand = new Random();
for (int i = 0; i < 10; i++) ...{
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawOval(x, y, 1, 1);
}
// 释放图形上下文
g.dispose();
try ...{
ImageIO.write(image, "JPEG", os);
} catch (IOException e) ...{
e.printStackTrace();
return "";
}
return strEnsure;
}
}
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
public class ImageEnsure ...{
private char mapTable[] = ...{ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9' };
/**//*
* 在os中输出一个大小为width,height的图片
*
*/
public String getEnsure(int width, int height, OutputStream os) ...{
if (width <= 0)
width = 60;
if (height <= 0)
height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
//画背景
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
//画边框
g.setColor(Color.BLACK);
g.drawRect(0, 0, width - 1, height - 1);
String strEnsure = "";
//生成4位验证码
for (int i = 0; i < 4; ++i) ...{
strEnsure += mapTable[(int) (mapTable.length * Math.random())];
}
// 将验证码画到图片中
g.setColor(Color.BLACK);
g.setFont(new Font("Atlantic Inline", Font.PLAIN, 10));
String str = strEnsure.substring(0);
g.drawString(str, 8, 17);
str = strEnsure.substring(1, 2);
g.drawString(str, 20, 15);
str = strEnsure.substring(2, 3);
g.drawString(str, 35, 18);
str = strEnsure.substring(3, 4);
g.drawString(str, 45, 15);
// 随机产生100个干扰点
Random rand = new Random();
for (int i = 0; i < 10; i++) ...{
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawOval(x, y, 1, 1);
}
// 释放图形上下文
g.dispose();
try ...{
ImageIO.write(image, "JPEG", os);
} catch (IOException e) ...{
e.printStackTrace();
return "";
}
return strEnsure;
}
}
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