java验证工具_「verifycode」java工具类——验证码(VerifyCode)

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verifycode

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import javax.imageio.ImageIO;

public class VerifyCode {private int w = 70;

private int h = 35;

private Random r = new Random();

// 定义有那些字体

private String[] fontNames = { “宋体”, “华文楷体”, “黑体”, “微软雅黑”, “楷体_GB2312” };

// 定义有那些验证码的随机字符

private String codes = “23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ”;

// 生成背景色

private Color bgColor = new Color(250, 250, 250);

// 用于gettext 方法获得生成的验证码文本

private String text;

// 生成随机颜色

private Color randomColor() {

int red = r.nextInt(150);

int green = r.nextInt(150);

int blue = r.nextInt(150);

return new Color(red, green, blue);

}

// 生成随机字体

private Font randomFont() {

int index = r.nextInt(fontNames.length);

String fontName = fontNames[index];

int style = r.nextInt(4);

int size = r.nextInt(5) 24;

return new Font(fontName, style, size);

}

// 画干扰线

private void drawLine(BufferedImage image) {

int num = 3;

Graphics2D g2 = (Graphics2D) image.getGraphics();

for (int i = 0; i < num; i ) {

int x1 = r.nextInt(w);

int y1 = r.nextInt(h);

int x2 = r.nextInt(w);

int y2 = r.nextInt(h);

g2.setStroke(new BasicStroke(1.5F));// 不知道

g2.setColor(Color.blue);

g2.drawLine(x1, y1, x2, y2);

}

// 得到codes的长度内的随机数并使用charAt 取得随机数位置上的codes中的字符

private char randomChar() {

int index = r.nextInt(codes.length());

return codes.charAt(index);

}

// 创建一张验证码的图片

public BufferedImage createImage() {

BufferedImage image = new BufferedImage(w, h,

BufferedImage.TYPE_INT_RGB);

Graphics2D g2 = (Graphics2D) image.getGraphics();

StringBuilder sb = new StringBuilder();

// 向图中画四个字符

for (int i = 0; i < 4; i ) {

String s = randomChar() “”;

sb.append(s);

float x = i * 1.0F * w / 4;

g2.setFont(randomFont());

g2.setColor(randomColor());

g2.drawString(s, x, h – 5);

}

this.text = sb.toString();

drawLine(image);

// 返回图片

return image;

}

// 得到验证码的文本后面是用来和用户输入的验证码检测用

public String getText() {

return text;

}

// 定义输出的对象和输出的方向

public static void output(BufferedImage bi, OutputStream fos)

throws FileNotFoundException, IOException {

ImageIO.write(bi, “JPEG”, fos);

}

以上，就生成了一个验证码。

写一个test，生成指定的验证码图像jpgpublic class test {

public static void main(String[] args) throws IOException {

VerifyCode code = new VerifyCode();

BufferedImage image = code.createImage();

ImageIO.write(image,”jpg”,new File(“F:/image.jpg”));

}

当然，也可以在servlet里生成。@WebServlet(urlPatterns=”/VerifyCodeServlet.do”)

public class VerifyCodeServlet extends HttpServlet {

@Override

protected void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

VerifyCode code = new VerifyCode();

BufferedImage image = code.createImage();

ImageIO.write(image,”jpg”,response.getOutputStream());

}

然后展示在.html或.jsp里

java验证工具_「verifycode」java工具类——验证码(VerifyCode) – seo实验室