Java实现滑动验证码(前端部分)-Java开发

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>