本代码可直接运行,生成的验证码是p_w_picpath.jpg,被保存在D盘的根目录下面。java
package com.server;dom
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.p_w_picpath.BufferedImage;
import java.io.File;
import java.util.Random;ide
import javax.p_w_picpathio.ImageIO;
import javax.p_w_picpathio.stream.ImageOutputStream;函数
public class Image {
public String sRand="";
public Color getRandColor(int fc,int bc){//给定范围得到随机颜色
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 creatImage(){字体
// 在内存中建立图象
int width=60, height=20;
BufferedImage p_w_picpath = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);server
// 获取图形上下文
Graphics g = p_w_picpath.getGraphics();内存
//生成随机类
Random random = new Random();get
// 设定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);string
//设定字体
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//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));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}it
// 取随机产生的认证码(4位数字) //String rand = request.getParameter("rand"); //rand = rand.substring(0,rand.indexOf(".")); for (int i=0;i<4;i++){ String rand=String.valueOf(random.nextInt(10)); sRand+=rand; // 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)));// 调用函数出来的颜色相同,多是由于种子太接近,因此只能直接生成 g.drawString(rand,13*i+6,16); } // 图象生效 g.dispose(); return p_w_picpath; } public static void main(String[] args) { File file=new File("D://p_w_picpath.jpg"); try{ BufferedImage p_w_picpath=new Image().creatImage(); ImageOutputStream p_w_picpathIo=ImageIO.createImageOutputStream(file); ImageIO.write(p_w_picpath, "jpg", p_w_picpathIo); }catch (Exception e) { e.printStackTrace();// TODO: handle exception } } }