http://www.open-open.com/lib/view/open1413428178653.html
加减运算图片验证码的实现
package mob.v3.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class VerficationCode {
private int result2=0;
Random rand = new Random();
/**
* 随机产生的加数和被加数
*/
private int jiashu=0;
private int beijiashu=0;
/**
* 随机产生的计算方式,0表示加,1表示减
*/
private int js=0;
private char[] aa={'零','壹','贰','叁','肆','伍','陆','柒','捌','玖'};
private char[] bb={'0','1','2','3','4','5','6','7','8','9'};
private char[] cc={'〇','一','二','三','四','五','六','七','八','九'};
private char[] action={'加','减','+','-'};
private char[] jieguo={'等','是'};
public static void main(String[] args) {
// VerificationImage code=new VerificationImage();
JFrame jFrame=new JFrame();
jFrame.setBounds(400, 400, 250, 250);
VerficationCode code = new VerficationCode();
ImageIcon img = new ImageIcon(code.getVerificationCode2());
JLabel background = new JLabel(img);
jFrame.add(background);
jFrame.setVisible(true);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
/**
* 第二种验证码的计算方式,两位数的加减法
* @return 一个新的验证码图片
*/
public BufferedImage getVerificationCode2()
{
int width=150;
int height=70;
int degree=0;//继续一共旋转的角度,方便最后的时候旋转回来
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
// 设定背景色
Color background=getColor();
g.setColor(background);
g.fillRect(0, 0, width, height);
//画边框
g.setColor(background);
g.drawRect(0,0,width-1,height-1);
// 将认证码显示到图像中,如果要生成更多位的认证码
char[] content=getDrawContent2();
int[] xs=getRadonWidths(content.length);
int[] ys=getRadomHeights(content.length);
for(int i=0;i
if(content[i]=='!')
s="";
//如果在画字之前旋转图片
if(i!=2){
int maxDegree=rand.nextInt(2);
if(maxDegree==0)
maxDegree=0;
else maxDegree=305;
degree=rand.nextInt(45)+maxDegree;
} else degree=0;
g.setColor(getColor());
if(i==2)//运算符号显示大一些
g.setFont(new Font("Atlantic Inline",Font.PLAIN,24));
else
g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
RotateString(s, xs[i], ys[i], g, degree);
}
//画干扰点
CreateRandomPoint(width, height, 80, g);
//随机画几条线
CreateRandomLine(width, height,4,g);
// 释放图形上下文
g.dispose();
System.out.println("计算的结果是="+getResult2());
return image;
}
/**
* 旋转并且画出指定字符串
* @param s 需要旋转的字符串
* @param x 字符串的x坐标
* @param y 字符串的Y坐标
* @param g 画笔g
* @param degree 旋转的角度
*/
private void RotateString(String s,int x,int y,Graphics g,int degree)
{
Graphics2D g2d = (Graphics2D) g.create();
// 平移原点到图形环境的中心 ,这个方法的作用实际上就是将字符串移动到某一个位置
g2d.translate(x-1, y+3);
// 旋转文本
g2d.rotate(degree* Math.PI / 180);
//特别需要注意的是,这里的画笔已经具有了上次指定的一个位置,所以这里指定的其实是一个相对位置
g2d.drawString(s,0 , 0);
}
/**
*
* @param width
* @param height
* @param many
* @param g
*/
private void CreateRandomPoint(int width,int height,int many,Graphics g)
{ // 随机产生干扰点
for (int i=0;i
int y = rand.nextInt(height);
g.setColor(getColor());
g.drawOval(x,y,1,1);
}
}
/**
*
* @param width
* @param height
* @param minMany 最少产生的数量
* @param g
*/
private void CreateRandomLine(int width,int height,int minMany,Graphics g)
{ // 随机产生干扰线条
for (int i=0;i
int y1 = rand.nextInt(height);
int x2 = (int) (rand.nextInt(width)%40+width*0.7);
int y2 = rand.nextInt(height);
g.setColor(getColor());
g.drawLine(x1, y1, x2, y2);
}
}
/***
* @return 随机返回一种颜色
*/
private Color getColor()
{
int R=(int) (Math.random()*255);
int G=(int) (Math.random()*255);
int B=(int) (Math.random()*255);
return new Color(R,G,B);
}
/**
*
* @return 返回getVerificationCode2需要画出的内容:两位数加减法字符数组
*/
private char[] getDrawContent2()
{ beijiashu=0;
jiashu=0;
char[] temp=new char[6];
char[] w =aa;
int k=0;
/**
* 产生被加数
*/
//从aa\bb\cc中选择一个字符数组作为素材
k=(int)(Math.random()*4);
if(k==0)
w=aa;
else if(k==1) w=bb;
else if(k==3) w=cc;
k=(int)(Math.random()*10);
temp[0]=w[k];
if(k==0) temp[0]='!';
beijiashu+=k*10;
k=(int)(Math.random()*10);
temp[1]=w[k];
beijiashu+=k;
/**
* 产生加数
*/
//从aa\bb\cc中选择一个字符数组作为素材
k=(int)(Math.random()*4);
if(k==0)
w=aa;
else if(k==1) w=bb;
else if(k==3) w=cc;
k=(int)(Math.random()*10);
temp[3]=w[k];
if(k==0) temp[3]='!';
jiashu=k*10+jiashu;
k=(int)(Math.random()*10);
temp[4]=w[k];
jiashu+=k;
//选择加减乘除
w=action;
k=(int)(Math.random()*4 );
temp[2]=w[k];
js=k%2;
//结果
w=jieguo;
k=(int)(Math.random()*2);
temp[5]=w[k];
//System.out.println(new String(temp));
return temp;
}
/**
* 对图片选择,这里保留以方便以后使用
* @param bufferedimage
* @param degree
* @return 一张旋转后的图片
*/
public BufferedImage rolateImage(BufferedImage bufferedimage,int degree,Color backGround)
{
BufferedImage img;
int w = bufferedimage.getWidth();
int h = bufferedimage.getHeight();
int type = BufferedImage.TYPE_INT_RGB;
Graphics2D graphics2d;
graphics2d = (img = new BufferedImage(w, h, type)).createGraphics();
graphics2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
graphics2d.drawImage(bufferedimage,null, null);
return img;
}
/**
* 得到验证码getVerificationCode2,计算出来的结果
*/
public int getResult2()
{ if(js==0)
return(beijiashu+jiashu);
else if(js==1) return (beijiashu-jiashu);
return 0;
}
/**
*
* @param many
* @return 画图的时候随机的高度的数组
*/
private int[] getRadomHeights(int many){
int[] temp=new int[many];
for(int i=0;i
}
return temp;
}
/**
*
* @param many
* @return 画图的时候起始x坐标的数组
*/
private int[] getRadonWidths(int many)
{ int[] temp=new int[many];
for(int i=0;i
temp[i]=getRadonWidth(0);
else temp[i]=getRadonWidth(temp[i-1]);
}
return temp;
}
private int getRadomHeight()
{ int fullHeight=70;
return (int)(Math.random()*fullHeight)%35+15;
}
private int getRadonWidth(int minWidth)
{ int maxWidth=150;
int minJianju=maxWidth/9;
int maxJianju=maxWidth/6;
int temp=maxJianju-minJianju;
//在的规定的范围内产生一个随机数
return (int)(Math.random()*temp)+minWidth+minJianju;
}
}
在spring中调用方法为（springMVC框架）
@RequestMapping("/getProduct")
public String getProduct(HttpServletRequest request, HttpServletResponse response)
{
try{
ServletOutputStream outStream = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream);
VerficationCode code = new VerficationCode();
encoder.encode(code.getVerificationCode2());
outStream.close();
}catch(Exception e){
e.printStackTrace();
}
return "agreement/yzmcs";
}