程序/cxtdgl/src/org/front/CodeImageAction.java

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package org.front;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import com.opensymphony.xwork2.ActionSupport;
@Scope("prototype")
@Component("CodeImageAction")
public class CodeImageAction  extends ActionSupport {
	private static final long serialVersionUID = 5233173565763369435L;

	private ByteArrayInputStream inputStream;
	private static int WIDTH = 60;
	private static int HEIGHT = 30;
	public ByteArrayInputStream getInputStream() {
		return inputStream;
	}
	public void setInputStream(ByteArrayInputStream inputStream) {
		this.inputStream = inputStream;
	}
	private static String createRandom() {
		String str = "0123456789QWERTYUIOPASDFGHJKLZXCVBNM";
		char[] rands = new char[4];
		Random random = new Random();
		for (int i = 0; i < 4; i++) {
			rands[i] = str.charAt(random.nextInt(36));
		}
		return new String(rands);
	}

	private void drawBackground(Graphics g) {
		// 画背景
		g.setColor(new Color(0xDCDCDC));
		g.fillRect(0, 0, WIDTH, HEIGHT);
		// 随机产生 120 个干扰点
		for (int i = 0; i < 120; i++) {
			int x = (int) (Math.random() * WIDTH);
			int y = (int) (Math.random() * HEIGHT);
			int red = (int) (Math.random() * 255);
			int green = (int) (Math.random() * 255);
			int blue = (int) (Math.random() * 255);
			g.setColor(new Color(red, green, blue));
			g.drawOval(x, y, 1, 0);
		}
	}

	private void drawRands(Graphics g, String rands) {