二维码

ValidateCode_3.java

import java.awt.image.BufferedImage;

import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Font;
import java.awt.BasicStroke;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import java.util.Collections;
import java.util.Arrays;
import java.util.List;


public class ValidateCode {
   public static void main(String[] args) {
      getValidateCode("f:\\validateCode.jpg");
   }


   private static void getValidateCode(String path) {
      int width = 100;
      int height = 50;


      BufferedImage image =
         new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
      Graphics2D g = image.createGraphics();


      g.setColor(new Color(
            getRandom(0, 100),
            getRandom(0, 100),
            getRandom(0, 100)));
      g.fillRect(0, 0, width, height);
      int number = 4;


      for(int i = 1; i <= number; i++) {
         g.setColor(new Color(
            getRandom(100, 255),
            getRandom(100, 255),
            getRandom(100, 255),
            getRandom(100, 255)));
         g.setFont(new Font(getFontName(), getStyle(), 40));
         g.drawString(String.valueOf(getChar()),
            width * i / (number + 3), (int) (height / 1.5));
      }


      BasicStroke stroke = new BasicStroke(getRandom(1, 5),
         BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
      g.setStroke(stroke);
      g.drawLine(getRandom(0, 10), height / getRandom(1, 10),
         width, height / getRandom(1, 2));
      g.drawLine(getRandom(0, 10), height / getRandom(3, 10),
         width, height / getRandom(1, 3));


      try {
         FileOutputStream out = new FileOutputStream(path);
         ImageIO.write(image, "jpg", out);
         out.flush();
         out.close();
      }
      catch(Exception e) {
         e.printStackTrace();
      }
   }


   private static char getChar() {
      Character[] chars = {'0', 'v', '2', 'x', '4', 'z', '6', 'r', '8', 't',
                      'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
                      'k', 'l', 'm', 'n', 'o', 'p', 'q', '7', 's', '9',
                      'u', '1', 'w', '3', 'y', '5'};


      List list = Arrays.asList(chars);
      Collections.shuffle(list);
      chars = (Character[])list.toArray();
      return chars[getRandom(0, chars.length)];
   }


   private static String getFontName() {
      String[] names =
         {"SimSun", "Times New Roman", "Arial", "Courier New"};


      return names[getRandom(0, names.length)];
   }


   private static int getStyle() {
      int[] styles =
         {Font.PLAIN, Font.BOLD, Font.ITALIC, Font.BOLD | Font.ITALIC};


      return styles[getRandom(0, styles.length)];
   }


   private static int getRandom(int start, int end) {
      int index = -1;


      while(!(index >= start && index <= end)) {
         index = (int) (Math.random() * end);
      }


      return index;
   }

}

validateCode .java

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;


public class validateCode {


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


File f = new File("E:/validateCode.jpg");
OutputStream os = new FileOutputStream(f);
new validateCode().getCertPic(0, 0, os);
}


//验证码图片中可以出现的字符集，可根据需要修改
private char mapTable[]={
'a','b','c','d','e','h',
'j','k','m','n','p','q',
'r','s','t','u','v','w',
'x','y','z','0','2','3',
'4','5','6','7','8','9'
};


public String getCertPic(int width, int height,OutputStream os) {
if(width<=0) {
width=60;
}
if(height<=0) {
height=20;
}


BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
//获取图形上下文
Graphics g = image.getGraphics();
//设定背景颜色
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
//画边框
g.setColor(Color.black);
g.drawRect(0, 0, width-1, height-1);
//随机产生的验证码
String strEnsure="";
//4代表4位验证码，如果要生成等多位的验证码 ，则加大数值


for(int i=0; i<4; i++) {
strEnsure += mapTable[(int)(mapTable.length*Math.random())];
}
//将验证码显示在图像中，如果要生成更多位的验证码，增加drawString语句
g.setColor(Color.black);
g.setFont(new Font("Atlantic Inline", Font.PLAIN,18));
String str = strEnsure.substring(0, 1);
g.drawString(str, 8, 17);
str = strEnsure.substring(1, 2);
g.drawString(str, 20, 15);
str = strEnsure.substring(2, 3);
g.drawString(str, 35, 18);
str = strEnsure.substring(3, 4);
g.drawString(str, 45, 15);
//随机产生10个干扰点


Random random = new Random();
for(int i=0; i<10; i++ ) {
int x = random.nextInt(width);
int y = random.nextInt(height);
g.drawOval(x, y, 1, 1);
}
//释放图形上下文
g.dispose();
try{
//输出图像到页面
ImageIO.write(image, "JPEG", os);
}catch(IOException e) {
return "";
}
return strEnsure;
}
}