前言
本文提供可以修改图片分辨率的java工具类，实用主义的狂欢。
环境依赖
添加必要的一些maven依赖。
<dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.15</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>31.0.1-jre</version> </dependency> <dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv-platform</artifactId> <version>1.5.5</version> </dependency>
代码
不废话，上代码。
import cn.hutool.core.util.IdUtil; import com.google.common.base.Joiner; import com.google.common.base.Splitter; import org.bytedeco.javacpp.Loader; import java.io.File; import java.text.MessageFormat; import java.util.Arrays; import java.util.List; /** * @Program: csdn @ClassName: ModifyImageResolution @Author: 剑客阿良_ALiang @Date: 2021-12-12 * 13:37 @Description: 修改图片分辨率 @Version: V1.0 */ public class ModifyImageResolution { /** * 修改图片分辨率 * * @param imagePath 原图片地址 * @param outputDir 输出目录 * @param width 宽度 * @param height 高度 * @return 图片地址 * @throws Exception 异常 */ public static String modifyResolution( String imagePath, String outputDir, Integer width, Integer height) throws Exception { List<String> paths = Splitter.on(".").splitToList(imagePath); String ext = paths.get(paths.size() - 1); if (!Arrays.asList("jpg", "png").contains(ext)) { throw new Exception("format error"); } String resultPath = Joiner.on(File.separator).join(Arrays.asList(outputDir, IdUtil.simpleUUID() + "." + ext)); String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class); ProcessBuilder builder = new ProcessBuilder( ffmpeg, "-i", imagePath, "-vf", MessageFormat.format("scale={0}:{1}", String.valueOf(width), String.valueOf(height)), resultPath); builder.inheritIO().start().waitFor(); return resultPath; } }
代码说明：
1、modifyResolution方法入参分别为：原图片路径、输出目录地址、调整宽度、调整高度。
2、图片格式校验只有jpg、png，可以自行添加。
3、输出文件名避免重复使用uuid作为文件名。
验证一下：
准备的图片如下：
执行代码：
public static void main(String[] args) throws Exception { System.out.println( modifyResolution( "C:\\Users\\yi\\Desktop\\2053767.jpg", "C:\\Users\\yi\\Desktop", 1280, 720)); }
执行结果：
E:\Java\jdk1.8.0_40\bin\java.exe "-javaagent:E:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\lib\idea_rt.jar=4212:E:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\bin" -Dfile.encoding=UTF-8 -classpath 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5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica-platform\1.80.0-1.5.5\leptonica-platform-1.80.0-1.5.5.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-arm.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract-platform\4.1.1-1.5.5\tesseract-platform-4.1.1-1.5.5.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-arm.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\xyz\downgoon\snowflake\1.0.0\snowflake-1.0.0.jar com.huyi.csdn.tools.ModifyImageResolution C:\Users\yi\.javacpp\cache\ffmpeg-4.3.2-1.5.5-windows-x86_64.jar\org\bytedeco\ffmpeg\windows-x86_64\ffmpeg.exe ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 10.2.0 (Rev5, Built by MSYS2 project) configuration: --prefix=.. --disable-iconv --disable-opencl --disable-sdl2 --disable-bzlib --disable-lzma --disable-linux-perf --enable-shared --enable-version3 --enable-runtime-cpudetect --enable-zlib --enable-libmp3lame --enable-libspeex --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-openssl --enable-libopenh264 --enable-libvpx --enable-libfreetype --enable-libopus --enable-cuda --enable-cuvid --enable-nvenc --enable-libmfx --enable-w32threads --enable-indev=dshow --target-os=mingw32 --cc='gcc -m64' --extra-cflags=-I../include/ --extra-ldflags=-L../lib/ --extra-libs='-static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++ -lgcc_eh -lWs2_32 -lcrypt32 -lpthread -lz -lm -Wl,-Bdynamic -lole32 -luuid' libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 Input #0, image2, from 'C:\Users\yi\Desktop\2053767.jpg': Duration: 00:00:00.04, start: 0.000000, bitrate: 177398 kb/s Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080, 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native)) Press [q] to stop, [?] for help [swscaler @ 0000015bc83f50c0] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to 'C:\Users\yi\Desktop\8a7e61cc06c64d17916b2dae6da92322.jpg': Metadata: encoder : Lavf58.45.100 Stream #0:0: Video: mjpeg, yuvj444p(pc), 1280x720, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc58.91.100 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A frame= 1 fps=0.0 q=6.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.161x video:106kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown C:\Users\yi\Desktop\8a7e61cc06c64d17916b2dae6da92322.jpg Process finished with exit code 0
执行效果：
OK。
总结
没啥总结的。
