图形验证码登录
添加图片标签，进入页面访问/api/verifyCode
1.html
<img onclick="javascript:getvCode()" id="verifyimg" style="margin-left: 20px;"/>
<script>
getvCode();
/**
* 获取验证码
* 将验证码写到index.html页面的id = verifyimg 的地方
*/
function getvCode() {
document.getElementById("verifyimg").src = timestamp("/api/verifyCode");
}
//为url添加时间戳
function timestamp(url) {
var getTimestamp = new Date().getTime();
if (url.indexOf("?") > -1) {
url = url + "×tamp=" + getTimestamp
} else {
url = url + "?timestamp=" + getTimestamp
}
return url;
};
</script>
2.Controller
package com.aaa.controller;
import com.aaa.pojo.VerifyCode;
import com.aaa.service.EmployeeImpl.SimpleCharVerifyCodeGenImpl;
import com.aaa.service.IVerifyCodeGen;
import io.swagger.annotations.ApiOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Controller
public class verifyCode{
private static final Logger LOGGER = LoggerFactory.getLogger(verifyCode.class);
String code;
@ApiOperation(value = "验证码")
@GetMapping("/verifyCode")
public void verifyCode(HttpServletRequest request, HttpServletResponse response) {
IVerifyCodeGen iVerifyCodeGen = new SimpleCharVerifyCodeGenImpl();
try {
//设置长宽
VerifyCode verifyCode = iVerifyCodeGen.generate(80, 28);
code = verifyCode.getCode();
LOGGER.info(code);
//将VerifyCode绑定session
request.getSession().setAttribute("VerifyCode", code);
//设置响应头
response.setHeader("Pragma", "no-cache");
//设置响应头
response.setHeader("Cache-Control", "no-cache");
//在代理服务器端防止缓冲
response.setDateHeader("Expires", 0);
//设置响应内容类型
response.setContentType("image/jpeg");
response.getOutputStream().write(verifyCode.getImgBytes());
response.getOutputStream().flush();
}
catch (IOException e) {
LOGGER.info("", e);
}
}
}
3.验证码实体类
package com.aaa.pojo;
import lombok.Data;
/**
* 验证码类
*/
@Data
public class VerifyCode {
private String code;
private byte[] imgBytes;
private long expireTime;
}
4.service
package com.aaa.service;
import com.aaa.pojo.VerifyCode;
import java.io.IOException;
import java.io.OutputStream;
/**
* 验证码生成接口
*/
public interface IVerifyCodeGen {
/**
* 生成验证码并返回code，将图片写的os中
*
* @param width
* @param height
* @param os
* @return
* @throws IOException
*/
String generate(int width, int height, OutputStream os) throws IOException;
/**
* 生成验证码对象
*
* @param width
* @param height
* @return
* @throws IOException
*/
VerifyCode generate(int width, int height) throws IOException;
}
5.serviceImpl
package com.aaa.service.EmployeeImpl;
import com.aaa.pojo.VerifyCode;
import com.aaa.service.IVerifyCodeGen;
import com.aaa.util.RandomUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
/**
* 验证码实现类
*/
@Service
public class SimpleCharVerifyCodeGenImpl implements IVerifyCodeGen {
private static final Logger logger = LoggerFactory.getLogger(SimpleCharVerifyCodeGenImpl.class);
private static final String[] FONT_TYPES = { "\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66" };
private static final int VALICATE_CODE_LENGTH = 4;
/**
* 设置背景颜色及大小，干扰线
*
* @param graphics
* @param width
* @param height
*/
private static void fillBackground(Graphics graphics, int width, int height) {
// 填充背景
graphics.setColor(Color.WHITE);
//设置矩形坐标x y 为0
graphics.fillRect(0, 0, width, height);
// 加入干扰线条
for (int i = 0; i < 8; i++) {
//设置随机颜色算法参数
graphics.setColor(RandomUtils.randomColor(40, 150));
Random random = new Random();
int x = random.nextInt(width);
int y = random.nextInt(height);
int x1 = random.nextInt(width);
int y1 = random.nextInt(height);
graphics.drawLine(x, y, x1, y1);
}
}
/**
* 生成随机字符
*
* @param width
* @param height
* @param os
* @return
* @throws IOException
*/
@Override
public String generate(int width, int height, OutputStream os) throws IOException {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics graphics = image.getGraphics();
fillBackground(graphics, width, height);
String randomStr = RandomUtils.randomString(VALICATE_CODE_LENGTH);
createCharacter(graphics, randomStr);
graphics.dispose();
//设置JPEG格式
ImageIO.write(image, "JPEG", os);
return randomStr;
}
/**
* 验证码生成
*
* @param width
* @param height
* @return
*/
@Override
public VerifyCode generate(int width, int height) {
VerifyCode verifyCode = null;
try {
//将流的初始化放到这里就不需要手动关闭流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
String code = generate(width, height, baos);
verifyCode = new VerifyCode();
verifyCode.setCode(code);
verifyCode.setImgBytes(baos.toByteArray());
} catch (IOException e) {
logger.error(e.getMessage(), e);
verifyCode = null;
}
return verifyCode;
}
/**
* 设置字符颜色大小
*
* @param g
* @param randomStr
*/
private void createCharacter(Graphics g, String randomStr) {
char[] charArray = randomStr.toCharArray();
for (int i = 0; i < charArray.length; i++) {
//设置RGB颜色算法参数
g.setColor(new Color(50 + RandomUtils.nextInt(100),
50 + RandomUtils.nextInt(100), 50 + RandomUtils.nextInt(100)));
//设置字体大小，类型
g.setFont(new Font(FONT_TYPES[RandomUtils.nextInt(FONT_TYPES.length)], Font.BOLD, 26));
//设置x y 坐标
g.drawString(String.valueOf(charArray[i]), 15 * i + 5, 19 + RandomUtils.nextInt(8));
}
}
}
6.实现效果
右侧验证码显示效果，点击图片可以换图
