Java实现滑动验证码(前端部分)
作者：weixin_52707625
这篇文章主要为大家介绍了如何用Java语言实现滑动验证码的生成(前端部分)，文中的示例代码讲解详细，具有一定的学习价值，感兴趣的小伙伴可以跟随小编学习一下
实现思路
1、请求后端获得背景图、滑块、x、y、误差范围bound
2、将滑块设置到对应的位置：top = y
3、添加鼠标滑动事件
实现代码
后端请求（Controller）
SliderVerifyController
/**
* @author: Yang
* @create: 2022-10-25
* @Description: 滑动验证
*/
@RestController
@RequestMapping("/sliderVerify")
public class SliderVerifyController {
@Resource
private SliderVerifyService sliderVerifyService;
@GetMapping
public ResponseResult generateSliderVerify() {
return sliderVerifyService.generateSliderVerify();
}
}
SliderVerifyServiceImpl
/**
* @author: Yang
* @create: 2022-10-25
* @Description:
*/
@Service
public class SliderVerifyServiceImpl implements SliderVerifyService {
@Value("${my.staticPath}")
private String path;
@Override
public ResponseResult generateSliderVerify() {
int index = new Random().nextInt(5) + 1;
ImageSlideVerify slideVerify = ImageSlideVerifyUtil.cutting(
new File(System.getProperty("user.dir") + "/web_component/src/main/resources/static/sliderVerify/" + index + ".png"));
return new ResponseResult<>(200, slideVerify);
}
}
HTML代码
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>滑动验证码</title>
</head>
<body>
<div id="box">
<div id="content">
<img id="bg" src="bg.png" />
<img id="block" src="b.png"/>
</div>
<!-- 滑块 -->
<div id="slider">
<div id="slider-block">
</div>
</div>
</div>
</body>
<script>
let blockImg = document.querySelector("#block");// 滑块
let bgImg = document.querySelector("#bg");// 背景
let sliderBlock = document.querySelector("#slider-block");// 滑动栏的滑块
function sliderVerify(callback){
// 获取验证码信息
const xhr = new XMLHttpRequest();
xhr.open("get", "http://localhost:8080/sliderVerify", true);
xhr.send();
xhr.onreadystatechange = function(){
if(this.readyState == 4 && this.status == 200){
let data = JSON.parse(this.response).data;
blockImg.src = data.blockImg;
bgImg.src = data.bgImg;
blockImg.style.top = data.y + 80 + "px";
callback && callback(data); // 回调函数
}
}
}
// 执行
sliderVerify(function (data) {
// 添加鼠标事件
sliderBlock.addEventListener("mousedown", (e1) => {
const x = e1.x;
window.onmousemove = function(e) {
let left = e.x - x;
// 设置边界，因为我的图片大小都是固定425，所以我直接固定
if(e1.target.offsetLeft >= 425){
sliderBlock.style.left = 425 + "px";
blockImg.style.left = 425 - 20 + "px";
return;
}
// 移动
sliderBlock.style.left = left + "px";
blockImg.style.left = left - 20 + "px";
}
// 鼠标释放
window.onmouseup = function(e){
// 获取滑动到的位置
let left = sliderBlock.style.left.split("px")[0];
// 减去80内边距并转成数字
left = Number(left) - 80;
// 清空鼠标滑动事件
window.onmousemove = null;
// 回到初始位置
sliderBlock.style.left = 0 + "px";
blockImg.style.left = 0 - 20 + "px";
// 判断是否在范围内
if(left >= data.x - data.bound && left <= data.x + data.bound){
alert("验证成功");
} else {
alert("验证错误")
window.location.reload()
}
}
})
});
</script>
<style>
#content{
user-select: none;
position: relative;
padding: 80px;
padding-bottom: 0;
}
#block{
position: absolute;
/* top: 169px; */
left: -20px;
}
#slider{
position: relative;
display: flex;
align-items: center;
box-sizing: border-box;
width: 505px;
height: 50px;
padding: 0 2px;
border: 3px groove ;
}
#slider-block{
position: relative;
width: 70px;
height: 40px;
background-color: antiquewhite;
}
</style>
</html>
实现结果
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