根据网下代码修改的验证码工具类

根据网上代码修改的验证码工具类

ImageCode类

package com.archer.util;

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

import javax.imageio.ImageIO;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ImageCode {
 
 protected static Log log = LogFactory.getLog(ImageCode.class);
 
 public static String FONT_FAMILY = "Arial Black";
 public static Integer FONT_SIZE = 16;
 

 /**
  * 生成图形验证码，并返回code值
  * @param width
  * @param height
  * @param num
  * @param out
  * @return
  */
 public static String getCode(int width,int height,int num, OutputStream out){
  //防止非负数
  width=width>0?width:60;
  height=height>0?height:18;
  //生成一张新图片
  BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
  Font font = new Font(FONT_FAMILY,Font.PLAIN,FONT_SIZE);
  //绘制图片
  Random random = new Random();
  Graphics g = image.getGraphics();
  g.setColor(getRandColor(200,250));
  g.fillRect(1, 1, width-1, height-1);
  g.setColor(new Color(102,102,103));
  g.drawRect(0,0,width-1,height-1);
  g.setFont(font);
  //随机生成线条，让图片看起来更加杂乱
  g.setColor(getRandColor(160,200));
  for(int i=0;i<155;i++){
      int x = random.nextInt(width-1);
      int y = random.nextInt(height-1);
      int x1 = random.nextInt(6)+1;
      int y1 = random.nextInt(12)+1;
      g.drawLine(x,y,x+x1,y+y1);
  }
     //该变量用于保存系统生成的随机字符串
     String sRand = "";
     for(int i=0; i<num; i++){
      //取得一个随机字符
      String tmp = getRandomChar();
      sRand += tmp;
      //将系统随机字符添加到图形验证码图片上
      g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
      g.drawString(tmp, FONT_SIZE*i+10, FONT_SIZE);
  }
     g.dispose();
     try {
   ImageIO.write(image, "JPEG", out);
   out.close();
  } catch (IOException e) {
   sRand = null;
   log.warn(LogTool.getException(e));
  }
  return sRand;
 }
 
 /**
  * 生成随机颜色
  * @param fc
  * @param bc
  * @return
  */
 public static Color getRandColor(int fc, int bc) {
    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);
 }

 /**
  * 生成随机字符的方法
  */
 public static String getRandomChar(){
    int rand = (int)Math.round(Math.random()*2);
    long itmp = 0;
    char ctmp = '\u0000';
    //根据rand的值来决定是生成一个大写字母，小写字母和数字
    switch(rand){
    //生成大写字母的情形
    case 1:
     itmp = Math.round(Math.random()*25+65);
     ctmp = (char)itmp;
     return String.valueOf(ctmp);
    //生成小写字母的情形
    case 2:
     itmp = Math.round(Math.random()*25+97);
     ctmp = (char)itmp;
     return String.valueOf(ctmp);
    //生成数字的情形
    default:
     itmp = Math.round(Math.random()*9);
     return String.valueOf(itmp);
    }
  
 }
}

//测试类

package com.archer.util;

import static org.junit.Assert.*;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.archer.test.BaseTest;

public class ImageCodeTest {

 @Before
 public void setUp() throws Exception {
 }

 @Test
 public void testGetCode() throws FileNotFoundException {
  FileOutputStream fos = new FileOutputStream("E:\\practise\\imageCode.jpg");
  ImageCode.FONT_SIZE = 35;
  String str = ImageCode.getCode(200, 40,5, fos);
  System.out.println(str);
  assertFalse("".equals(str));
 }

}