@Resource(name = "redisTemplate")
private RedisTemplate<String, String> redisTemplate;
@GET
@Path("/outputVerifyCode/{sid}")
public void outputVerifyCode(@PathParam("sid") String sid, @Context HttpServletResponse response) {
try {
// 禁止图像缓存
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", -1);
response.setContentType("image/jpeg");
OutputVerifyCode verifyCode = new OutputVerifyCode();
ServletOutputStream sos = response.getOutputStream();
verifyCode.output(verifyCode.getImage(), sos);
// 获取验证码文本
String text = verifyCode.getText().toUpperCase();
sos.close();
String redisKey = String.format("%s-%s", sid, "verifyCode");
redisTemplate.opsForValue().set(redisKey, text);
redisTemplate.expire(redisKey, 60L, TimeUnit.SECONDS);
} catch (Exception e) {
log.error("==> 获取验证码失败", e);
}
}
package com.common.util;
import javax.imageio.ImageIO;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
/**
* <p>
* <code>OutputVerifyCode</code>
* </p>
* Description: 验证码
*
* @date 2019-04-28 下午 02:19
*/
public class OutputVerifyCode {
private int w = 70;
private int h = 35;
private Random r = new Random();
/** 可选字体 */
private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
/** 可选字符 */
private String codes = "0123456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
/** 背景色 */
private Color bgColor = new Color(255, 255, 255);
/** 验证码上的文本 */
private String text;
/**
* 保存图片到指定的输出流
*
* @date 2019-04-28 下午 02:20
*/
public void output(BufferedImage image, OutputStream out) throws IOException {
ImageIO.write(image, "JPEG", out);
}
/**
* 生成随机的颜色
*
* @date 2019-04-28 下午 02:20
*/
private Color randomColor() {
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, green, blue);
}
/**
* 生成随机的字体
*
* @date 2019-04-28 下午 02:21
*/
private Font randomFont() {
int index = r.nextInt(fontNames.length);
// 生成随机的字体名称
String fontName = fontNames[index];
// 生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)
int style = r.nextInt(4);
// 生成随机字号, 24 ~ 28
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
/**
* 画干扰线
*
* @date 2019-04-28 下午 02:21
*/
private void drawLine(BufferedImage image) {
// 一共画3条
int num = 3;
Graphics2D g2 = (Graphics2D) image.getGraphics();
// 生成两个点的坐标，即4个值
for (int i = 0; i < num; i++) {
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setStroke(new BasicStroke(1.5F));
// 干扰线是蓝色
g2.setColor(Color.BLUE);
// 画线
g2.drawLine(x1, y1, x2, y2);
}
}
/**
* 随机生成一个字符
*
* @date 2019-04-28 下午 02:22
*/
private char randomChar() {
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
/**
* 创建BufferedImage
*
* @date 2019-04-28 下午 02:22
*/
private BufferedImage createImage() {
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
/**
* 调用这个方法得到验证码
*
* @date 2019-04-28 下午 02:22
*/
public BufferedImage getImage() {
// 创建图片缓冲区
BufferedImage image = createImage();
// 得到绘制环境
Graphics2D g2 = (Graphics2D) image.getGraphics();
// 用来装载生成的验证码文本
StringBuilder sb = new StringBuilder();
// 向图片中画4个字符，循环四次，每次生成一个字符
for (int i = 0; i < 4; i++) {
// 随机生成一个字母
String s = randomChar() + "";
// 把字母添加到sb中
sb.append(s);
// 设置当前字符的x轴坐标
float x = i * 1.0F * w / 4;
// 设置随机字体
g2.setFont(randomFont());
// 设置随机颜色
g2.setColor(randomColor());
// 画图
g2.drawString(s, x, h - 5);
}
// 把生成的字符串赋给了this.text
this.text = sb.toString();
// 添加干扰线
drawLine(image);
return image;
}
/**
* 返回验证码图片上的文本
*
* @date 2019-04-28 下午 02:23
*/
public String getText() {
return this.text;
}
}
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