【无标题】

package cn.chenhailong.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 Vdemo02 {
    private int w=70;
    private int h=35;
    private Random r=new Random();
    private String[] fontNames = {"宋体","华文楷书","黑体","微软雅黑","楷体_GB2312"};    //可选字体
    //可选字符
    private String codes = "23456789abcdefghjkmnopQrstuvwxyz";
    //背景色
    private Color bgColor = new Color(255,255,255);
    //验证码上的文本
    private String text;
    
    
    private Color randomColor() {
        int red=r.nextInt(150);
        int green = r.nextInt(150);
        int blue=r.nextInt(150);
        return new Color(red,green,blue);
    }
    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);
    }
    private void drawLine (BufferedImage image) {
        int sum=3;
        Graphics2D g2=(Graphics2D)image.getGraphics();
        for(int i=0;i<sum;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));
            g2.setColor(Color.BLUE);
            g2.drawLine(x1, y1, x2, y2);
        }
    }
    
    private char randomChar() {
        int index = r.nextInt(codes.length());
        return codes.charAt(index);
        
    }
    
    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
    //private BufferedImage getImage() {
        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();//用来装载绘制的验证码文本
        //向图片中画四个字符
        for(int i=0;i<4;i++) {//循环四次，每一次生成一个字符
            String s = randomChar()+"";//随机生成一个字符
            sb.append(s);//把字母添加到sb中去
            float x= i*1.0F*w/4;//设置当前字母的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this.text
        drawLine(image);//添加干扰线
        return image;
    }
    
    
    //返回验证码上的文本
    //private String getText() {
         String getText() {
        return text;
    }
    
    
    public static void output(BufferedImage image,OutputStream out)
    throws    IOException{
        ImageIO.write(image, "JPEG", out);
    }
}