Java实现图片裁剪功能的示例详解

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

        <dependency>
            <groupid>com.google.guava</groupid>
            <artifactid>guava</artifactid>
            <version>30.1.1-jre</version>
        </dependency>
        <dependency>
            <groupid>org.bytedeco</groupid>
            <artifactid>javacv-platform</artifactid>
            <version>1.5.5</version>
        </dependency>
        <dependency>
            <groupid>cn.hutool</groupid>
            <artifactid>hutool-all</artifactid>
            <version>5.5.2</version>
        </dependency>

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<string> 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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