Java實(shí)現(xiàn)滑動驗(yàn)證碼(前端部分)

更新時間：2022年10月27日 14:53:08 作者：weixin_52707625

這篇文章主要為大家介紹了如何用Java語言實(shí)現(xiàn)滑動驗(yàn)證碼的生成(前端部分)，文中的示例代碼講解詳細(xì)，具有一定的學(xué)習(xí)價值，感興趣的小伙伴可以跟隨小編學(xué)習(xí)一下

實(shí)現(xiàn)思路

1、請求后端獲得背景圖、滑塊、x、y、誤差范圍bound

2、將滑塊設(shè)置到對應(yīng)的位置：top = y

3、添加鼠標(biāo)滑動事件

實(shí)現(xiàn)代碼

后端請求（Controller）

SliderVerifyController

/**
 * @author: Yang
 * @create: 2022-10-25
 * @Description: 滑動驗(yàn)證
 */
@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代碼

<!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>滑動驗(yàn)證碼</title>
</head>
<body>
	<div id="box">
		<div id="content">
			<img id="bg" src="bg.png" />
			<img id="block" src="b.png"/>
		</div>
		<!-- 滑塊 -->
		<div id="slider">
			<div id="slider-block">
				
			</div>
		</div>
	</div>
</body>
<script>
	let blockImg = document.querySelector("#block");// 滑塊
	let bgImg = document.querySelector("#bg");// 背景
	let sliderBlock = document.querySelector("#slider-block");// 滑動欄的滑塊
	function sliderVerify(callback){
		// 獲取驗(yàn)證碼信息
		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); // 回調(diào)函數(shù)
			}
		}
	}
	// 執(zhí)行
	sliderVerify(function (data) {
		// 添加鼠標(biāo)事件
		sliderBlock.addEventListener("mousedown", (e1) => {
			const x = e1.x;
			window.onmousemove = function(e) {
				let left = e.x - x;
				// 設(shè)置邊界，因?yàn)槲业膱D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;
				}
				// 移動
				sliderBlock.style.left = left + "px";
				blockImg.style.left = left - 20 + "px";
			}
			// 鼠標(biāo)釋放
			window.onmouseup = function(e){
				// 獲取滑動到的位置
				let left = sliderBlock.style.left.split("px")[0];
				// 減去80內(nèi)邊距并轉(zhuǎn)成數(shù)字
				left = Number(left) - 80;
				// 清空鼠標(biāo)滑動事件
				window.onmousemove = null;
				// 回到初始位置
				sliderBlock.style.left = 0 + "px";
				blockImg.style.left = 0 - 20 + "px";
				// 判斷是否在范圍內(nèi)
				if(left >= data.x - data.bound && left <= data.x + data.bound){
					alert("驗(yàn)證成功");
				} else {
					alert("驗(yàn)證錯誤")
					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>