接口
import com.**.common.lang.StringUtils; //自行引用
import com.**.common.web.BaseController;//自行引用
import com.**.modules.sys.utils.CaptchaUtils;//下面给出
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Map;
/**
* @Auther:
* @Date: 2018/11/15 14:24
* @Description:
*/
@Controller
@RequestMapping(value = "captcha")
public class CaptchaController extends BaseController {
@RequestMapping(value = "/getCaptcha")
@ResponseBody
public String imagecode(HttpServletRequest request, HttpServletResponse response) throws Exception {
response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
OutputStream os = response.getOutputStream();
//返回验证码和图片的map
Map<String,Object> map = CaptchaUtils.getImageCode(86, 34, os);
String simpleCaptcha = "simpleCaptcha";
request.getSession().setAttribute(simpleCaptcha, map.get("strEnsure").toString().toLowerCase());
request.getSession().setAttribute("codeTime",new Date().getTime());
try {
ImageIO.write((BufferedImage) map.get("image"), "jpg", os);
} catch (IOException e) {
return "";
} finally {
if (os != null) {
os.flush();
os.close();
}
}
return null;
}
@RequestMapping(value = "/verify")
@ResponseBody
public String checkcode(HttpServletRequest request,
HttpSession session,
String checkCode) throws Exception {
// 获得验证码对象
Object cko = session.getAttribute("simpleCaptcha");
// if (cko == null) {
// request.setAttribute("errorMsg", "请输入验证码！");
// return "请输入验证码！";
// }
String captcha = cko.toString();
// 判断验证码输入是否正确
if (StringUtils.isEmpty(checkCode) || captcha == null || !(checkCode.equalsIgnoreCase(captcha))) {
request.setAttribute("errorMsg", "验证码错误！");
return "false";
} else {
// 在这里可以处理自己需要的事务，比如验证登陆等
return "true";
}
}
}
工具类
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.OutputStream;import java.util.HashMap;
import java.util.Map;import java.util.Random;
/**
* @Auther:
* @Date: 2018/11/15 14:28
* @Description:
*/
public class CaptchaUtils {
private static char mapTable[] = {
'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', '0', '1',
'2', '3', '4', '5', '6', '7',
'8', '9'};
public static Map<String, Object> getImageCode(int width, int height, OutputStream os) {
Map<String,Object> returnMap = new HashMap<String, Object>();
if (width <= 0) width = 60;
if (height <= 0) height = 20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
//生成随机类
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
//设定字体
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
g.setColor(getRandColor(160, 200));
// // 随机产生168条干扰线，使图象中的认证码不易被其它程序探测到
// g.setColor(getRandColor(160, 200));
// for (int i = 0; i < 168; 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);
// }
// 画 50 个噪点(颜色及位置随机
for (int i = 0; i < 50; i++) {
// 随机颜色
int rInt = random.nextInt(100)+50;
int gInt = random.nextInt(100)+50;
int bInt = random.nextInt(100)+50;
g.setColor(new Color(rInt, gInt, bInt));
// 随机位置
int xInt = random.nextInt(width - 3);
int yInt = random.nextInt(height - 2);
// 随机旋转角度
int sAngleInt = random.nextInt(360);
int eAngleInt = random.nextInt(360);
// 随机大小
int wInt = random.nextInt(6);
int hInt = random.nextInt(6);
// 填充背景
g.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt);
// 画5条干扰线
if (i % 10 == 0) {
int xInt2 = random.nextInt(width);
int yInt2 = random.nextInt(height);
g.drawLine(xInt, yInt, xInt2, yInt2);
}
}
//取随机产生的码
String strEnsure = "";
//4代表4位验证码,如果要生成更多位的认证码,则加大数值
for (int i = 0; i < 4; ++i) {
strEnsure += mapTable[(int) (mapTable.length * Math.random())];
// 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)));
// 直接生成
String str = strEnsure.substring(i, i + 1);
// 设置随便码在背景图图片上的位置
g.drawString(str, 13 * i + 20, 25);
}
// 释放图形上下文
g.dispose();
returnMap.put("image",image);
returnMap.put("strEnsure",strEnsure);
return returnMap;
}
//给定范围获得随机颜色
static 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);
}
}
引用
