Java实现图片裁剪功能的示例详解

目录

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.ba.joiner;import com.google.common.ba.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: cuto高血压的危害uttool @author: 剑客阿良_aliang @date: 2022-01-寒花晚节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 imagep黄渤演讲ath,      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.parator).join(arrays.aslist(outputdir, idutil.simpleuuid() + "." + ext));    string ffmpeg = loader.load(org.bytedeco.ffmpeg.ffmpeg.class);    processbuilder builder =        new processbuilder(            ffmpeg,            阿狸图片大全"-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:\\urs\\yi\\desktop\54011.jpg", "c:\\urs\\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. 7.100input #0, image2, from 'c:\urs\yi\desktop54011.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 tbcstream mapping: stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))press [q] to stop, [?] for helpoutput #0, image2, to 'c:\urs\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/细水长流的爱情0/200000 buffer size: 0 vbv_delay: n/aframe=  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: unknownc:\urs\yi\desktop\\d1013fbee79e4380a01c574addf72afb.jpgprocess finished with exit code 0

结果图如下

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