RegisterCode.java

package com.snowcattle.game.common.util;

/**
 * Copyright 2003-2005 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Random;

import javax.imageio.ImageIO;

public class RegisterCode {

  public Color getRandColor(int fc, int bc) { //给定范围获得随机颜色
    Random random = new Random();
    if (fc > 255)
      fc = 255;
    if (bc > 255)
      bc = 255;
    int r = fc + random.nextInt(bc - fc);
    int g = fc + random.nextInt(bc - fc);
    int b = fc + random.nextInt(bc - fc);
    return new Color(r, g, b);
  }

  public BufferedImage getBufferedImage(int width, int height) {
    return new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  }

  public BufferedImage getBufferedImage(InputStream in) throws Exception {
    return ImageIO.read(in);
  }

  public void create(int imageWidth, int imageHeight, String randNumber,
                     String fontType, int fontSize, int x, int y,
                     OutputStream out) {
    BufferedImage image = getBufferedImage(imageWidth, imageHeight);
    generate(image, randNumber, fontType, fontSize, x, y, out);
  }

  public void generate(BufferedImage image, String randNumber,
                       String fontType, int fontSize, int x, int y,
                       OutputStream out) {

    try {
      int width = image.getWidth();
      int height = image.getHeight();

      // 获取图形上下文
      Graphics g = image.getGraphics();

      // 设定背景色
      g.setColor(getRandColor(200, 250));
      g.fillRect(0, 0, width, height);


      //画边框
      //g.setColor(new Color());
      //g.drawRect(0,0,width-1,height-1);

      // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
      g.setColor(getRandColor(160, 200));
      //生成随机类
      Random random = new Random();

		  switch (random.nextInt(3)){
			case 0:for (int i = 0; i < 20+random.nextInt(100); i++) {int x2 = random.nextInt(width);
				int y2 = random.nextInt(height);
				int x3 = random.nextInt(200);
				int y3 = random.nextInt(100);
				g.drawLine(x2, y2, x2 + x3, y2 + y3);}
				break;
			case 1:for (int i = 0; i < 20+random.nextInt(100); i++) {
				g.drawOval(random.nextInt(width), random.nextInt(height), random.nextInt(50), random.nextInt(50));
				}
				break;
			case 2:for (int i = 0; i < 20+random.nextInt(100); i++) {
				g.drawRoundRect(random.nextInt(width), random.nextInt(height), random.nextInt(50), random.nextInt(50), random.nextInt(50), random.nextInt(50));
				}
				break;
		  }



		// 将认证码显示到图象中 //
		g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110),20 + random.nextInt(110)));

      //g.drawString(randNumber, x, y);
	  for(int i=0;i<randNumber.length();i++){
		  g.setFont(new Font(fontList.get(random.nextInt(fontList.size())), Font.PLAIN, fontSize));
		g.drawString(randNumber.charAt(i)+"", x+(i*fontSize)+random.nextInt(5)-random.nextInt(5), y+random.nextInt(10));
	  }

	  switch (random.nextInt(3))
	  {
			case 0://画长线
				for (int i = 0; i < random.nextInt(10); i++) {
					int x2 = random.nextInt(width);
					int y2 = random.nextInt(height);
					int x3 = random.nextInt(212);
					int y3 = random.nextInt(212);
					g.drawLine(x2, y2, x2 + x3, y2 + y3);
				}
				break;
			case 1://画驼圆
				for (int i = 0; i < random.nextInt(10); i++) {
					g.drawOval(random.nextInt(width), random.nextInt(height), random.nextInt(50), random.nextInt(50));
				}
				break;
			case 2://方
				for (int i = 0; i < random.nextInt(10); i++) {
					g.drawRoundRect(random.nextInt(width), random.nextInt(height), random.nextInt(50), random.nextInt(50), random.nextInt(50), random.nextInt(50));
				}
				break;
	  }




      // 图象生效
      g.dispose();

      // 输出图象到页面
      ImageIO.write( (BufferedImage) image, "JPEG", out);
    } catch (Exception ex) {
      System.err.println("generate image error: " + ex);
    }

  }
		private final static java.util.List<String> fontList=new ArrayList<String>();
		static{
			if(fontList.isEmpty()){
				fontList.add("宋体");
				fontList.add("楷体_GB2312");
				fontList.add("幼圆");
				fontList.add("黑体");
				fontList.add("隶书");
			}
		}


	//utils
	public static final String insertSpace(String k,int inSnum){ //将insnum个空格随机插入k中间
		StringBuffer o=new StringBuffer();
		for(int i=0;i<k.length();i++){
			o.append(
				k.charAt(i)
			).append(
				_getSpace(ShootUtils.getRandom(inSnum))
			);
		}
		return o.toString();
	}
	public static final StringBuffer _getSpace(int num){//获得空格
		StringBuffer o=new StringBuffer(num);
		for(int i=0;i<num;i++){
			o.append(" ");
		}
		return o;
	}
	/*
		response.setContentType("image/jpeg");
		OutputStream toClient=response.getOutputStream();

		String str=StringUtils.getChinese(2+FMath.getRandom(3+1));
		new RegisterCode().create(250, 50, insertSpace(str,1),
                     "宋体", 15+FMath.getRandom(18+1),//隶书  楷体_GB2312
					 1+FMath.getRandom(30), 33,
                    toClient);
					toClient.close();
	*/
}