import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ValiImage extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		int  width = 150;

		int  height = 50;

		BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

		Graphics2D g = (Graphics2D) image.getGraphics();

		//添加背景颜色

		g.setColor(Color.GRAY);

		g.fillRect(0,0,width,height);

		//添加边框

		g.setColor(Color.black);

		g.drawRect(0,0,width-1,height-1);

		//画干扰线

		int count = 10;

		while(count>0)

		{

			g.setColor(Color.RED);

			g.drawLine(RandomNum(0,width), RandomNum(0,height),RandomNum(0,width), RandomNum(0,height));

			count--;

		}

		//画字体

		for(int p = 0 ; p < 4; p++)

		{

			g.setColor(new Color(RandomNum(0,255),RandomNum(0,255),RandomNum(0,255)));

			g.setFont(new Font("黑体",Font.BOLD,20));

			g.drawString("中",5+(p*37),25);

		}

		ImageIO.write(image,"jpg",response.getOutputStream());

	}

	private Random rand = new Random();

	public int RandomNum(int i,int j)

	{

		//返回一个大于i小于j的随机数

		//return rand.nextInt(j-i)+i;

		return i+(int)(Math.random()*j);

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request,response);

	}

}