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ImageCompressDemo.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Maven: net.coobird:thumbnailator:0.4.8" level="project" />
+  </component>
+</module>

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>groupId</groupId>
+    <artifactId>ImageCompressDemo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>2.5.5</version>
+                <configuration>
+                   <archive>
+                       <manifest>
+                           <mainClass>client</mainClass>
+                       </manifest>
+                   </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>net.coobird</groupId>
+            <artifactId>thumbnailator</artifactId>
+            <version>0.4.8</version>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/CompressObject.java

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+import java.io.File;
+
+public class CompressObject {
+    public File imgFile;
+    public float scale;
+
+    public CompressObject(File imgFile, float scale){
+        this.imgFile = imgFile;
+        this.scale = scale;
+    }
+}

src/main/java/client.java

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+import net.coobird.thumbnailator.Thumbnails;
+import net.coobird.thumbnailator.name.Rename;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.*;
+import java.util.*;
+import java.util.stream.Collectors;
+
+//tip 优化 IMAGEIO 那里其实读取了两遍，但Thumb没有读取像素的功能我也表示很绝望
+public class client {
+    public static void main(String[] args) {
+        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
+
+        String folderPath=null;
+        Rename RENAME_STRATEGY = null;
+
+        int limit_X = 0;
+        int limit_Y = 0;
+
+        //请保证文件夹内都是要修改的
+        try{
+            System.out.println("请输入压缩图片存放的文件夹(最好是都要修改的)：");
+            folderPath = bf.readLine();
+            folderPath = folderPath.replaceAll("\\\\" , "\\\\\\\\");
+
+            System.out.println("请输入图片最大长度（单位px）：");
+            limit_X = Integer.parseInt(bf.readLine());
+
+            System.out.println("请输入图片最大宽度（单位px）：");
+            limit_Y = Integer.parseInt(bf.readLine());
+
+            System.out.println("是否覆盖原文件? T/F");
+
+            //有个可能BUG 但是不想修就是输不是T的 == F
+            RENAME_STRATEGY = (bf.readLine().equals("T"))? Rename.NO_CHANGE : Rename.PREFIX_DOT_THUMBNAIL;
+        }catch (IOException ioe){
+            ioe.printStackTrace();
+            System.out.println("程序执行错误，IO问题");
+        }catch (Exception e){
+            e.printStackTrace();
+            System.out.println("程序执行错误，问题不明");
+        }
+
+        //C:\Users\ASUS\Desktop\测试文件夹\007.jpg
+
+        // 流式压缩
+        try {
+            //tip asList
+            List<File> imgList = Arrays.asList(new File(folderPath).listFiles());
+
+            final int limit_height = limit_Y;
+            final int limit_width = limit_X;
+
+            List<CompressObject> toConductList = imgList.stream().map(r->{
+                float scale=1;
+
+                //计算能够过限制的最大scale
+                try {
+                    BufferedImage sourceImg = ImageIO.read(new FileInputStream(r));
+                    int imgH = sourceImg.getHeight();
+                    int imgW = sourceImg.getWidth();
+
+                    if(imgH>limit_height && imgW>limit_width){
+                        float scaleA = limit_height / (float)imgH;
+                        float scaleB = limit_width  / (float)imgW;
+
+                        scale = Math.min(scaleA,scaleB);
+                    }else if(imgH>limit_height){
+                        scale = limit_height / (float)imgH;
+                    }else if(imgW>limit_width){
+                        scale = limit_width  / (float)imgW;
+                    }else {
+                        scale = (float) 1.0;
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+
+                return new CompressObject(r,scale);
+            }).collect(Collectors.toList());
+
+
+            //压缩
+            for (CompressObject srcImg : toConductList){
+                System.out.println("开始压缩:"+srcImg.imgFile.getName());
+                Thumbnails.of(srcImg.imgFile)
+                        .scale(srcImg.scale)
+                        .outputFormat("jpg")
+                        .toFiles(RENAME_STRATEGY);
+                System.out.println("压缩完毕，压缩比:"+srcImg.scale);
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+            System.out.println("出现故障");
+        }
+
+        System.out.println("运行完毕，按任意键结束程序");
+        //任意读入一个东西
+        try { bf.readLine(); }catch (Exception e){ e.printStackTrace(); }
+    }
+}

target/maven-archiver/pom.properties

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+#Generated by Maven
+#Sat Sep 18 19:06:21 CST 2021
+version=1.0-SNAPSHOT
+groupId=groupId
+artifactId=ImageCompressDemo

target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

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+D:\ImageCompressDemo\src\main\java\client.java
+D:\ImageCompressDemo\src\main\java\CompressObject.java