生成验证码图片

package com.yunhe.dayzizhulianxi;

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

import javax.imageio.ImageIO;


public class ImageTest {
	
	//定义一个数组
	static String[] strs = {"a","b","c","d","e","f","g","h","i","j","k","m","n","p","q","r","s","t","u","v","w","x","y","z","2","3","4","5","6","7","8","9"};

	public static void main(String[] args) {
		
		//定义图片的高度
		int h = 50;
		//定义图片的宽度
		int w = 150;
		//图片的类型    图片的组成方式  RGB  red  green  blue三原色
		//int imageType = BufferedImage.TYPE_INT_RGB;
		//int imageType = 1;
		
		//1.画板  纸  JDK中提供画板类
		BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
		
		//先获取画笔的对象
		Graphics g = image.getGraphics();
		//给画笔设置颜色
		g.setColor(Color.yellow);
		//画矩形进行填充（将原来的图片进行覆盖）
		g.fillRect(0, 0, w, h);
		//定义x轴，y轴
		int x=30;
		int y=30;
		//给画笔再次设置颜色
		g.setColor(Color.red);
		//设置字体
		g.setFont(new Font("楷体",Font.PLAIN,25));
		//准备数据，从中选取四个数据
		Random random = new Random();
		for(int i=0;i<4;i++){
			//在字符串数组中拿到四个索引
			int num = random.nextInt(strs.length);
			//每循环一次读取一个字符串
			String str=strs[num];
			//每获取一次画上
			g.drawString(str, x, y);
			//每循环一次x值变大
			x+=25;
		}
		
		g.setColor(Color.green);
		//画十条干扰线
//		for(int i=0;i<10;i++){
//			int x1=random.nextInt(30);
//			int y1=random.nextInt(50);;
//			int x2=random.nextInt(30)+120;
//			int y2=random.nextInt(50);
//			g.drawLine(x1, y1, x2, y2);
//		}
		int x1=20;
		int y1=25;
		int x2=130;
		int y2=35;
		
		//画干扰线
		g.drawLine(x1, y1, x2, y2);
		
		//把生成的图片放在磁盘上
		try {
			ImageIO.write(image, "jpg", new File("F:\yunheshuju\image.jpg"));
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
}