javaee/JavaEEDZY/src/org/zhichunqi/code/PictureCheckCode.java

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package org.zhichunqi.code;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.imageio.ImageIO;

public class PictureCheckCode extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public PictureCheckCode() {
		super();
	}

	public void destroy() {
		super.destroy(); 
	}

	public void init() throws ServletException {
		super.init();
	}
	/*该方法主要作用是获得随机生成的颜色*/ 
	public Color getRandColor(int s,int e){
		Random random=new Random ();
		if(s>255) s=255;
		if(e>255) e=255;
		int r,g,b;
		r=s+random.nextInt(e-s);	//随机生成RGB颜色中的r值
		g=s+random.nextInt(e-s);	//随机生成RGB颜色中的g值
		b=s+random.nextInt(e-s);	//随机生成RGB颜色中的b值
		return new Color(r,g,b);
	}

	@Override
	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//设置不缓存图片
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "No-cache");
		response.setDateHeader("Expires", 0);
		//指定生成的响应图片,一定不能缺少这句话,否则错误.
		response.setContentType("image/jpeg");
		int width=86,height=30;		//指定生成验证码的宽度和高度
		BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);	//创建BufferedImage对象,其作用相当于一图片
		Graphics g=image.getGraphics();		//创建Graphics对象,其作用相当于画笔
		Graphics2D g2d=(Graphics2D)g;		//创建Grapchics2D对象
		Random random=new Random();
		Font mfont=new Font("楷体",Font.BOLD,18);	//定义字体样式
		g.setColor(getRandColor(200,250));
		g.fillRect(0, 0, width, height);	//绘制背景