Java实现图片裁剪功能的示例详解

目录

• 前言
• Maven依赖
• 代码
• 验证一下

前言

本文提供将图片按照自定义尺寸进行裁剪的Java工具类，一如既往的实用主义。

Maven依赖

        
            com.google.guava
            guava
            30.1.1-jre
        
        
            org.bytedeco
            javacv-platform
            1.5.5
        
        
            cn.hutool
            hutool-all
            5.5.2
        

代码

不废话，上代码。

package ai.guiji.csdn.tool;

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: CutOutTool @Author: 剑客阿良_ALiang @Date: 2022-01-23 18:27 @Description:
 * 裁剪工具 @Version: V1.0
 */
public class CutOutTool {
  /**
   * 图片裁剪
   *
   * @param imagePath 图片地址
   * @param outputDir 临时目录
   * @param startX 裁剪起始x坐标
   * @param startY 裁剪起始y坐标
   * @param weight 裁剪宽度
   * @param height 裁剪高度
   * @throws Exception 异常
   */
  public static String cutOutImage(
      String imagePath,
      String outputDir,
      Integer startX,
      Integer startY,
      Integer weight,
      Integer height)
      throws Exception {
    List paths = Splitter.on(".").splitToList(imagePath);
    String ext = paths.get(paths.size() - 1);
    if (!Arrays.asList("png", "jpg").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(
                "crop={0}:{1}:{2}:{3}",
                String.valueOf(weight),
                String.valueOf(height),
                String.valueOf(startX),
                String.valueOf(startY)),
            "-y",
            resultPath);
    builder.inheritIO().start().waitFor();
    return resultPath;
  }

  public static void main(String[] args) throws Exception {
    System.out.println(
        cutOutImage(
            "C:\\Users\\yi\\Desktop\\2054011.jpg", "C:\\Users\\yi\\Desktop\\", 0, 0, 1920, 2160));
  }
}

代码说明：

1、cutOutImage方法参数分别为图片路径、输出临时目录、起始坐标x值、起始坐标y值、裁剪宽度、裁剪高度。

2、采用uuid作为临时输出唯一id，避免重复。

3、对文件后缀格式做了校验，可以按照需求自行调整。

4、裁剪尺寸不能超出图片限制，按照需求自行调整。

验证一下

准备的图片如下

执行结果

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\2054011.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 255438 kb/s
    Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 3840x2160, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'C:\Users\yi\Desktop\\d1013fbee79e4380a01c574addf72afb.jpg':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: mjpeg, yuvj444p(pc), 1920x2160, 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=10.4 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.201x    
video:234kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
C:\Users\yi\Desktop\\d1013fbee79e4380a01c574addf72afb.jpg

Process finished with exit code 0

结果图如下

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