如何struts2下实现了图片验证码实例

发布网友 发布时间：2022-05-01 22:48

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热心网友 时间：2022-04-18 08:51

/**
* \file
* 该类是用于实现一个注册码
*
*
* copyright (C) 2000, 2011, Bluedon, co.,ltd
*
* @author zyj
* @version 1.0
*
* Modify log:
* - 2011-8-31 zyj
*
*/
package common.toolbag;

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;

/**
* 该类是用于实现一个注册码
*
* @author zyj
*
*/
public class ValidtorCode {

private Color getRandColor(int fc, int bc) {
// 给定范围获得随机颜色
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}

/**
* 该方法用于获得注册码
*
* @param out
* 用于输出注册码的流
* @param width
* 注册码的长度
* @param height
* 注册码的高度
* @return 返回字符串的注册码号码
* @throws IOException
* 产生注册码过程可能报IO流异常
*/
public String getImage(OutputStream out, int width, int height)
throws IOException {
String[] charCode = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",
"B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N",
"P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);

// 设定字体
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));

// 画边框
// g.setColor(new Color());
// g.drawRect(0,0,width-1,height-1);

// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}

// 取随机产生的认证码(4位数字)
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = charCode[random.nextInt(charCode.length - 1)];
sRand += rand;
// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 将认证码显示到图象中
g.drawString(rand, 13 * i + 6, 16);
}

// 图象生效
g.dispose();

// 输出图象到页面
ImageIO.write(image, "JPEG", out);
return sRand;

}

}