public class getRandomPictrue extends BaseAction implements IgnoreAction {
private ByteArrayInputStream image;// 图像
private String str;// 验证码
private static final int WIDTH = 80;
private static final int HEIGHT = 20;
/**
*
*/
private static final long serialVersionUID = -6098322779401546263L;
public String getRandomPictrue() {
int width = 120;
int height = 30;
// 步骤一 绘制一张内存中图片
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 步骤二 图片绘制背景颜色 ---通过绘图对象
Graphics graphics = bufferedImage.getGraphics();// 得到画图对象 --- 画笔
// 绘制任何图形之前 都必须指定一个颜色
graphics.setColor(getRandColor(200, 250));
graphics.fillRect(0, 0, width, height);
// 步骤三 绘制边框
graphics.setColor(Color.WHITE);
graphics.drawRect(0, 0, width - 1, height - 1);
// 步骤四 四个随机数字
Graphics2D graphics2d = (Graphics2D) graphics;
// 设置输出字体
graphics2d.setFont(new Font("宋体", Font.BOLD, 18));
String words ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
//String words ="1234567890";
Random random = new Random();// 生成随机数
// 定义StringBuffer
StringBuffer sb = new StringBuffer();
// 定义x坐标
int x = 10;
for (int i = 0; i < 4; i++) {
// 随机颜色
graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 旋转 -30 --- 30度
int jiaodu = random.nextInt(60) - 30;
// 换算弧度
double theta = jiaodu * Math.PI / 180;
// 生成一个随机数字
int index = random.nextInt(words.length()); // 生成随机数 0 到 length - 1
// 获得字母数字
char c = words.charAt(index);
sb.append(c);
// 将c 输出到图片
graphics2d.rotate(theta, x, 20);
graphics2d.drawString(String.valueOf(c), x, 20);
graphics2d.rotate(-theta, x, 20);
x += 30;
}
// 将生成的字母存入到session中
ServletActionContext.getRequest().getSession().setAttribute("checkcode", sb.toString());
// 步骤五 绘制干扰线
graphics.setColor(getRandColor(160, 200));
int x1;
int x2;
int y1;
int y2;
for (int i = 0; i < 30; i++) {
x1 = random.nextInt(width);
x2 = random.nextInt(12);
y1 = random.nextInt(height);
y2 = random.nextInt(12);
graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
}
// 将上面图片输出到浏览器 ImageIO
graphics.dispose();// 释放资源
try {
ImageIO.write(bufferedImage, "jpg", ServletActionContext.getResponse().getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return NONE;
}
/**
* 功能：设置第一种验证码的属性
*/
public void initNumVerificationCode(BufferedImage image) {
Random random = new Random(); // 生成随机类
Graphics g = initImage(image, random);
String sRand = "";
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，可能是因为种子太接近，所以只能直接生成
g.drawString(rand, 13 * i + 6, 16);
}
this.setStr(sRand);/* 赋值验证码 */
// 图象生效
g.dispose();
this.setImage(drawImage(image));
}
/**
* 功能：设置第二种验证码属性
*/
public void initLetterAndNumVerificationCode(BufferedImage image) {
Random random = new Random(); // 生成随机类
Graphics g = initImage(image, random);
String[] letter = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
"K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
"W", "X", "Y", "Z" };
String sRand = "";
for (int i = 0; i < 4; i++) {
String tempRand = "";
if (random.nextBoolean()) {
tempRand = String.valueOf(random.nextInt(10));
} else {
tempRand = letter[random.nextInt(25)];
if (random.nextBoolean()) {// 随机将该字母变成小写
tempRand = tempRand.toLowerCase();
}
}
sRand += tempRand;
g.setColor(new Color(20 + random.nextInt(10), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
g.drawString(tempRand, 13 * i + 6, 16);
}
this.setStr(sRand);/* 赋值验证码 */
g.dispose(); // 图象生效
this.setImage(drawImage(image));
}
/**
* 功能：设置第三种验证码属性 即：肆+？=24
*/
public void initChinesePlusNumVerificationCode(BufferedImage image) {
String[] cn = { "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖", "拾" };
Random random = new Random(); // 生成随机类
Graphics g = initImage(image, random);
int x = random.nextInt(10) + 1;
int y = random.nextInt(30);
this.setStr(String.valueOf(y));
g.setFont(new Font("楷体", Font.PLAIN, 14));// 设定字体
g.setColor(new Color(20 + random.nextInt(10), 20 + random.nextInt(110),
20 + random.nextInt(110)));
g.drawString(cn[x - 1], 1 * 1 + 6, 16);
g.drawString("+", 22, 16);
g.drawString("？", 35, 16);
g.drawString("=", 48, 16);
g.drawString(String.valueOf(x + y), 61, 16);
g.dispose(); // 图象生效
this.setImage(drawImage(image));
}
public Graphics initImage(BufferedImage image, Random random) {
Graphics g = image.getGraphics(); // 获取图形上下文
g.setColor(getRandColor(200, 250));// 设定背景色
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setFont(new Font("Times New Roman", Font.PLAIN, 14));// 设定字体
g.setColor(getRandColor(160, 200)); // 随机产生165条干扰线，使图象中的认证码不易被其它程序探测到
for (int i = 0; i < 165; 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);
}
return g;
}
public ByteArrayInputStream drawImage(BufferedImage image) {
ByteArrayInputStream input = null;
ByteArrayOutputStream output = new ByteArrayOutputStream();
try {
ImageOutputStream imageOut = ImageIO
.createImageOutputStream(output);
ImageIO.write(image, "JPEG", imageOut);
imageOut.close();
input = new ByteArrayInputStream(output.toByteArray());
} catch (Exception e) {
System.out.println("验证码图片产生出现错误：" + e.toString());
}
return input;
}
/*
* 功能：给定范围获得随机颜色
*/
private Color getRandColor(int fc, int bc) {
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);
}
/**
* 功能：获取验证码的字符串值
*
* @return
*/
public String getVerificationCodeValue() {
return this.getStr();
}
/**
* 功能：取得验证码图片
*
* @return
*/
public ByteArrayInputStream getImage() {
return this.image;
}
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
public void setImage(ByteArrayInputStream image) {
this.image = image;
}
private void mian() {
// TODO Auto-generated method stub
System.out.println(getRandomPictrue());
}
}
验证码工具类【复制】
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转载自www.cnblogs.com/hmhhz/p/12689479.html
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