随机生成图片验证码

package cn.testone.image;

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 = 150;
private int h = 70;
private Random r = new Random();
//可选字体，随意添加
private String[] fontNames = {"黑体","宋体","华文楷体","微软雅黑","楷体_GB2312"};
//可选字符，剔除掉了数字1，0，小写字母i，l，大写字母I，O，容易混淆
private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
//背景颜色
private Color bgColor = new Color(255,255,255);
//验证码的真实文本
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); //0（无） 1（粗体） 2（斜体） 3（粗＋斜）
int size = r.nextInt(5) +48;    //字体大小
return new Font(fontName, style, size);
}

//生成干扰线
private void drawLine (BufferedImage image) {
int num = 3;
Graphics2D g2 = (Graphics2D)image.get
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Graphics(); //绘制环境
for(int i = 0; i < num; i++){   //随机生成坐标
//一条线通过两个点的坐标，即四个参数确定
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);
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;
}

//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();//装载生成文本
//向图片中绘制四个字符
for(int i = 0; i < 4; i++){
String s = randomChar() + "";//随机生成一个字符
sb.append(s);   //添加进去
float x = i * 1.0F * w/4; //设置字符X轴坐标
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s,x,h-15);    //画图,字符，X轴，Y轴
}
this.text = sb.toString();  //正确验证码
drawLine(image); //干扰线
return image;
}

//返回正确文本
public String getText(){
return text;
}

//保存图片到指定位置
public static void output(BufferedImage image, OutputStream out)
throws IOException {
ImageIO.write(image, "JPEG", out);
}
}

package cn.testone.image;

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

import org.junit.Test;

public class Demo1 {
@Test
public void fun() throws FileNotFoundException, IOException{
VerifyCode vc = new VerifyCode();
BufferedImage bi = vc.getImage();
//这里填写自己想要存放的路径
VerifyCode.output(bi, new FileOutputStream("/Users/wanglei/Desktop/aaa.jpg"));
System.out.println(vc.getText());
}
}