添加依赖

<!-- https://mvnrepository.com/artifact/org.imgscalr/imgscalr-lib -->
<dependency>
    <groupId>org.imgscalr</groupId>
    <artifactId>imgscalr-lib</artifactId>
    <version>4.2</version>
</dependency>

代码

BufferedImage scaledImage = Scalr.resize(myImage, 200);