图形验证码实现：
源码包： https://download.csdn.net/download/xueer88888888888888/10466055
package com.example.demo;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import org.springframework.stereotype.Component;
@Component
public class VerityCode {
public BufferedImage createVerifyCode() {
int width = 80;
int height = 32;
//create the image
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// set the background color
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
// draw the border
g.setColor(Color.black);
g.drawRect(0, 0, width - 1, height - 1);
// create a random instance to generate the codes
Random rdm = new Random();
// make some confusion
for (int i = 0; i < 50; i++) {
int x = rdm.nextInt(width);
int y = rdm.nextInt(height);
g.drawOval(x, y, 0, 0);
}
// generate a random code
String verifyCode = generateVerifyCode(rdm);
g.setColor(new Color(0, 100, 0));
g.setFont(new Font("Candara", Font.BOLD, 24));
g.drawString(verifyCode, 8, 24);
g.dispose();
//把验证码存到redis中
int rnd = calc(verifyCode);
//redisService.set(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, rnd);
//输出图片
return image;
}
/* public static void main(String[] args) {
System.out.println(calc("1*3+8"));
}
*/
//计算验证码的值，方便和前台传来的值进行比较
private static int calc(String exp) {
try {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
return (Integer)engine.eval(exp);
}catch(Exception e) {
e.printStackTrace();
return 0;
}
}
private static char[] ops = new char[] {'+', '-', '*'};
private String generateVerifyCode(Random rdm) {
int num1 = rdm.nextInt(10);
int num2 = rdm.nextInt(10);
int num3 = rdm.nextInt(10);
char op1 = ops[rdm.nextInt(3)];
char op2 = ops[rdm.nextInt(3)];
String exp = ""+ num1 + op1 + num2 + op2 + num3;
return exp;
}
}
package com.example.demo;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class VerityCodeController {
@Autowired
private VerityCode verityCode;
@RequestMapping(value = "/verifyCode", method = RequestMethod.GET)
@ResponseBody
public String getMiaoshaVerifyCod(HttpServletResponse response) {
try {
BufferedImage image = verityCode.createVerifyCode();
OutputStream out = response.getOutputStream();
ImageIO.write(image, "JPEG", out);
out.flush();
out.close();
return null;
} catch (Exception e) {
e.printStackTrace();
return "错误";
}
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- jquery -->
<script type="text/javascript" src="/js/jquery.min.js"></script>
</head>
<body>
<img id="verifyCodeImg" width="80" height="32" style="display: none" />
</body>
<script type="text/javascript">
$(document).ready(function() {
alert("11");
$("#verifyCodeImg").attr("src", "/verifyCode");
$("#verifyCodeImg").show();
$("#verifyCode").show();
});
</script>
</html>