1.验证码生成工具类
package com.dzqc.dz.common.controller;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;
/**
* 验证码生成工具类
*/
public class ValidateCode {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 40;
// 验证码字符个数
private int codeCount = 5;
// 验证码干扰线数
private int lineCount = 150;
// 验证码
private String code = null;
// 验证码图片Buffer
private BufferedImage buffImg = null;
// 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)
private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
/**
* 默认构造函数,设置默认参数
*/
public ValidateCode() {
this.createCode();
}
/**
* @param width 图片宽
* @param height 图片高
*/
public ValidateCode(int width, int height) {
this.width = width;
this.height = height;
this.createCode();
}
/**
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param lineCount 干扰线条数
*/
public ValidateCode(int width, int height, int codeCount, int lineCount) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
this.lineCount = lineCount;
this.createCode();
}
public void createCode() {
int x = 0, fontHeight = 0, codeY = 0;
int red = 0, green = 0, blue = 0;
x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符)
fontHeight = height - 2;//字体的高度
codeY = height - 4;
// 图像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
/*// 将图像背景填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);*/
// 增加下面代码使得背景透明
buffImg = g.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
g.dispose();
g = buffImg.createGraphics();
// 背景透明代码结束
// 画图BasicStroke是JDK中提供的一个基本的画笔类,我们对他设置画笔的粗细,就可以在drawPanel上任意画出自己想要的图形了。
g.setColor(new Color(255, 0, 0));
g.setStroke(new BasicStroke(1f));
g.fillRect(128, 128, width, height);
// 生成随机数
Random random = new Random();
//设置字体类型、字体大小、字体样式
Font font = new Font("微软雅黑",Font.PLAIN, fontHeight);
g.setFont(font);
for (int i = 0; i < lineCount; i++) {
// 设置随机开始和结束坐标
int xs = random.nextInt(width);//x坐标开始
int ys = random.nextInt(height);//y坐标开始
int xe = xs + random.nextInt(width / 8);//x坐标结束
int ye = ys + random.nextInt(height / 8);//y坐标结束
// 产生随机的颜色值,让输出的每个干扰线的颜色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
g.setColor(new Color(red, green, blue));
g.drawLine(xs, ys, xe, ye);
}
// randomCode记录随机产生的验证码
StringBuffer randomCode = new StringBuffer();
// 随机产生codeCount个字符的验证码。
for (int i = 0; i < codeCount; i++) {
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
// 产生随机的颜色值,让输出的每个字符的颜色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
//指定某种颜色
//g.setColor(new Color(252, 145, 83));
g.setColor(new Color(red, green, blue));
g.drawString(strRand, (i + 1) * x, codeY);
// 将产生的四个随机数组合在一起。
randomCode.append(strRand);
}
// 将四位数字的验证码保存到Session中。
code = randomCode.toString();
}
public void write(String path) throws IOException {
OutputStream sos = new FileOutputStream(path);
this.write(sos);
}
public void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code;
}
/**
* 测试函数,默认生成到d盘
* @param args
*/
public static void main(String[] args) {
ValidateCode vCode = new ValidateCode(160,40,5,150);
try {
String path="D:/"+new Date().getTime()+".png";
System.out.println(vCode.getCode()+" >"+path);
vCode.write(path);
} catch (IOException e) {
e.printStackTrace();
}
}
}
2.控制层代码:
package com.dzqc.dz.common.controller;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.dzqc.dz.common.util.MyAjaxResult;
@Controller
@RequestMapping("/yzm")
public class TestControllers {
/**
* 跳转页面
* @param session
* @param id
* @return
*/
@RequestMapping("/yzm")
public String login() {
return "yzm";
}
/**
* 获取验证码图片
* @param request
* @param response
* @throws IOException
*/
@RequestMapping("/user/check")
public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
// 通知浏览器不要缓存
response.setHeader("Expires", "-1");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "-1");
ValidateCode vCode = new ValidateCode(160,40,5,150);
// 将验证码输入到session中,用来验证
String code=vCode.getCode();
request.getSession().setAttribute("code", code);
// 输出到web页面
ImageIO.write(vCode.getBuffImg(), "jpg", response.getOutputStream());
}
@RequestMapping("/submit")
@ResponseBody
public MyAjaxResult submit(HttpSession session,String username,String password,String judge) {
if(username==null||"".equals(username)) {
return MyAjaxResult.fail_300("请输入用户名");
}
if(password==null||"".equals(password)) {
return MyAjaxResult.fail_300("请输入密码");
}
if(judge==null||"".equals(judge)) {
return MyAjaxResult.success("请输入验证码");
}
Object code=session.getAttribute("code");
if(code==null) {
return MyAjaxResult.fail_300("验证码错误,请刷新验证码");
}else {
if(!judge.equals(code.toString())) {
session.removeAttribute("code");
return MyAjaxResult.fail_500("验证码错误");
}
}
session.removeAttribute("code");
return MyAjaxResult.success("登陆成功");
}
}
3.jsp页面
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>login test</title>
<script src="https://code.jquery.com/jquery-3.2.1.min.js" type="text/javascript"></script>
</head>
<body>
用户名<input type="text" value="" name="username" id="username"><br>
密码<input type="password" value="" name="password" id="password"><br><br>
<img alt="验证码" src="${path}/test/user/check" id="img"><br><br>
验证码<input type="text" value="" name="judge" id="judge"><br>
<input type="button" value="提交" id="sub"><br>
<script type="text/javascript">
$(function(){
$("#img").click(function(){
var url = "${path}/test/user/check?number="+Math.random();
$("#img").attr("src",url);
})
$("#sub").click(function(){
$.ajax({
url:'${path}/test/submit',
dataType:'json',
type:'post',
data:{
username:$("#username").val(),
password:$("#password").val(),
judge:$("#judge").val()
},
success:function(res){
alert(res.msg)
if(res.code==500){
var url = "${path}/test/user/check?number="+Math.random();
$("#img").attr("src",url);
}
},
error:function(res){
alert("网络错误");
}
})
})
})
</script>
</body>
</html>
4.成功截图

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