验证码java源代码

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException;

import javax.imageio.ImageIO;

public class Demo { public void fun1() throws FileNotFoundException, IOException { /*

* 1. 创建图片缓冲区 * 2. 设置其宽高

* 3. 得到这个图片的绘制环境（得到画笔） * 4. 保存起来 */

BufferedImage bi = new BufferedImage(70, 35, BufferedImage.TYPE_INT_RGB);

Graphics2D g = (Graphics2D)bi.getGraphics();//得到绘制环境 g.setColor(Color.WHITE);//把环境设置为白色 g.fillRect(0, 0, 70, 35);//填充矩形！填充矩形，从0,0点开始，宽70，高35，即整个图片，即为图片设置背景色 g.setColor(Color.RED);//把环境设置为红色 g.drawString(\"Hello\向图片上写入字符串，其中2,2表示x,y轴的坐标 ImageIO.write(bi, \"JPEG\ } public void fun2() throws FileNotFoundException, IOException { VerifyCode vc = new VerifyCode(); BufferedImage bi = vc.getImage(); VerifyCode.output(bi, new FileOutputStream(\"F:/xxx.jpg\")); System.out.println(vc.getText()); } }

package 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.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();

// {\"宋体\华文楷体\黑体\华文新魏\华文隶书\\"微软雅黑\楷体_GB2312\

private String[] fontNames = {\"宋体\", \"华文楷体\", \"黑体\", \"微软雅黑\", \"楷体_GB2312\"}; // 可选字符

private String codes =

\"234567abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ\"; // 背景色

private Color bgColor = new Color(255, 255, 255); // 验证码上的文本 private String text ;

// 生成随机的颜色

private Color randomColor () { int red = r.nextInt(150); int green = r.nextInt(150); int blue = r.nextInt(150);

return new Color(red, green, blue); }

// 生成随机的字体

private Font randomFont () {

int index = r.nextInt(fontNames.length); String fontName = fontNames[index];//生成随机的字体名称

int style = r.nextInt(4);//生成随机的样式, 0(无样式),

1(粗体), 2(斜体), 3(粗体+斜体)

int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28

return new Font(fontName, style, size); }

// 画干扰线

private void drawLine (BufferedImage image) { int num = 3;//一共画3条

Graphics2D g2 = (Graphics2D)image.getGraphics(); for(int i = 0; i < num; i++) {//生成两个点的坐标，即4个值

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)); g2.setColor(Color.BLUE); //干扰线是蓝色 g2.drawLine(x1, y1, x2, y2);//画线 } }

// 随机生成一个字符

private char randomChar () {

int index = r.nextInt(codes.length()); return codes.charAt(index); }

// 创建BufferedImage

private BufferedImage createImage () {

BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

Graphics2D g2 = (Graphics2D)image.getGraphics(); g2.setColor(this.bgColor); g2.fillRect(0, 0, w, h); return image; }

// 调用这个方法得到验证码

public BufferedImage getImage () {

BufferedImage image = createImage();//创建图片缓冲区

Graphics2D g2 =

(Graphics2D)image.getGraphics();//得到绘制环境

StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本

// 向图片中画4个字符

for(int i = 0; i < 4; i++) {//循环四次，每次生成一个字符

String s = randomChar() + \"\";//随机生成一个字母 sb.append(s); //把字母添加到sb中

float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标

g2.setFont(randomFont()); //设置随机字体 g2.setColor(randomColor()); //设置随机颜色 g2.drawString(s, x, h-5); //画图 }

this.text = sb.toString(); //把生成的字符串赋给了this.text

drawLine(image); //添加干扰线 return image; }

// 返回验证码图片上的文本 public String getText () { return text;

}

// 保存图片到指定的输出流

public static void output (BufferedImage image, OutputStream out)

throws IOException {

ImageIO.write(image, \"JPEG\", out); } }

package verifyCode;

import java.io.FileNotFoundException; import java.io.IOException;

public class VerifyCodeTest {

public static void main(String[] args) FileNotFoundException, IOException { Demo de = new Demo(); //de.fun1();

throws de.fun2(); } }