前言
一些短视频播放器在快进的时候经常能看到下方进度条展示的一个小的的单帧图片，亚马逊的转码服务（AWS MediaConvert）通过配置单帧缩略图来生成多个单帧图片。前端处理的时候需要按照时间每10秒去请求一次图片。
配置方式：
优化
由于是缩略图，没有必要多次请求，因此考虑使用lambda拼接成一张精灵图，前端根据坐标读取即可。
后端生成精灵图：
java
package req;
import lombok.Data;
import pers.cz.swiss.JsonUtils;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* @version 1.0
* 精灵图的核心逻辑是将多个图片合成为一个大图片，同时记录每一张图片在拼合后的大图中的位置
* @description: 精灵图测试
* @author: ChengZhi 0336
* @create: 2025-10-09 16:47
**/
public class SpriteImg {
public static void main(String[] args) throws IOException {
// 读取图片
String dir = "C:\\Users\\chengzhi\\Desktop\\视频封面";
File dirFile = new File(dir);
File[] files = dirFile.listFiles();
// 创建新图片
File newFile = new File("C:\\Users\\chengzhi\\Desktop\\视频封面\\new.png");
BufferedImage bufferedImage = ImageUtils.mergeImages(files, true);
ImageIO.write(bufferedImage, "png", newFile);
}
}
@Data
class Location {
private int x;
private int y;
private int width;
private int height;
private String name;
}
class ImageUtils {
/**
* 合并图片, 支持横向或竖向合并
* @param images
* @param isHorizontal
* @return
* @throws IOException
*/
public static BufferedImage mergeImages(File[] images, boolean isHorizontal) throws IOException {
int imagesCount = images.length;
System.out.println("待合并总数：" + imagesCount);
int maxWidth = 0;
int maxHeight = 0;
Map<String, BufferedImage> bufferedImages = new HashMap<>(imagesCount);
for (File image : images) {
BufferedImage bufferedImage = ImageIO.read(image);
if (bufferedImage == null) {
continue;
}
int width = bufferedImage.getWidth();
int height = bufferedImage.getHeight();
if (isHorizontal) {
maxHeight = Math.max(maxHeight, height);
maxWidth += width;
} else {
maxWidth = Math.max(maxWidth, width);
maxHeight += height;
}
bufferedImages.put(image.getName(), bufferedImage);
}
BufferedImage finalBufferedImage = new BufferedImage(maxWidth, maxHeight, BufferedImage.TYPE_INT_ARGB);
int startX = 0;
int startY = 0;
Map<String, Location> map = new HashMap<>();
for (Map.Entry<String, BufferedImage> entry : bufferedImages.entrySet()) {
BufferedImage bufImage = entry.getValue();
int width = bufImage.getWidth();
int height = bufImage.getHeight();
int[] ImageArray = new int[width * height];;
int[] rgb = bufImage.getRGB(0, 0, width, height, ImageArray, 0, width);
Location location = new Location();
location.setWidth(width);
location.setHeight(height);
location.setX(startX);
location.setY(startY);
if (isHorizontal) {
finalBufferedImage.setRGB(startX, startY, width, height, rgb, 0, width);
startX += width;
} else {
finalBufferedImage.setRGB(startX, startY, width, height, rgb, 0, width);
startY += height;
}
map.put(entry.getKey(), location);
}
System.out.println("合并完成！");
System.out.println("图片位置：" + JsonUtils.toJson(map));
return finalBufferedImage;
}
}前端展示demo：
js
<script setup>
import {ref, computed} from "vue";
import sprite from "@/views/drama/new.png"
import axios from "axios";
const image = ref(sprite)
// 精灵图元数据
const sprites = 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夏秋篇.jpg":{"x":69950,"y":0,"width":540,"height":762},"情书.jpg":{"x":70490,"y":0,"width":540,"height":771},"霸王别姬.jpg":{"x":71030,"y":0,"width":540,"height":800},"熔炉.jpg":{"x":71570,"y":0,"width":540,"height":771},"勇敢的心.jpg":{"x":72110,"y":0,"width":540,"height":800},"小鞋子.jpg":{"x":72650,"y":0,"width":407,"height":600}}
const selectedSprite = ref('')
// 计算当前选中图片的样式
const currentSpriteStyle = computed(() => {
if (!selectedSprite.value || !sprites[selectedSprite.value]) {
return {}
}
const sprite = sprites[selectedSprite.value]
return {
width: `${sprite.width}px`,
height: `${sprite.height}px`,
backgroundImage: `url(${image.value})`,
backgroundPosition: `-${sprite.x}px -${sprite.y}px`,
backgroundRepeat: 'no-repeat',
backgroundSize: 'auto'
}
})
const onSpriteChange = () => {
console.log('选择了图片:', selectedSprite.value)
}
</script>
<template>
<div class="sprite-container">
<h2>精灵图显示</h2>
<select v-model="selectedSprite" @change="onSpriteChange">
<option value="">请选择图片</option>
<option v-for="(sprite, name) in sprites" :key="name" :value="name">
{{ name }}
</option>
</select>
<div v-if="selectedSprite" class="sprite-display">
<div
class="sprite-image"
:style="currentSpriteStyle"
></div>
</div>
</div>
</template>
<style scoped>
.sprite-container {
padding: 20px;
text-align: center;
}
select {
padding: 10px;
font-size: 16px;
border: 1px solid #ddd;
border-radius: 4px;
margin: 20px 0;
}
.sprite-display {
margin: 20px 0;
}
.sprite-image {
border: 2px solid #007bff;
border-radius: 8px;
margin: 10px auto;
display: inline-block;
}
</style>效果：
