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Java修改圖片大小尺寸的簡單實現(xiàn)

更新時間：2021年09月17日 09:58:02 作者：西涼的悲傷

這篇文章主要介紹了Java修改圖片大小尺寸的簡單實現(xiàn)方式，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

方式一：使用Image.getScaledInstance

使用jdk的awt包下的Image.getScaledInstance實現(xiàn)圖片的縮放。好處是無需引入第三方j(luò)ar，缺點是會稍微有點模糊。

工具類ImageUtils：

package utils;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class ImageUtils {
    /**
     * 通過BufferedImage圖片流調(diào)整圖片大小
     */
    public static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) throws IOException {
        Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_AREA_AVERAGING);
        BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
        outputImage.getGraphics().drawImage(resultingImage, 0, 0, null);
        return outputImage;
    }
    /**
     * BufferedImage圖片流轉(zhuǎn)byte[]數(shù)組
     */
    public static byte[] imageToBytes(BufferedImage bImage) {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            ImageIO.write(bImage, "jpg", out);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }
    /**
     * byte[]數(shù)組轉(zhuǎn)BufferedImage圖片流
     */
    private static BufferedImage bytesToBufferedImage(byte[] ImageByte) {
        ByteArrayInputStream in = new ByteArrayInputStream(ImageByte);
        BufferedImage image = null;
        try {
            image = ImageIO.read(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return image;
    }
}

測試

1.通過 url 獲取圖片并調(diào)整大小后保存：

import utils.ImageUtils;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
public class Test {
    public static void main(String[] args) {
        try {
            //通過url獲取BufferedImage圖像緩沖區(qū)
            URL img = new URL("https://img1.360buyimg.com/image/jfs/t1/38591/20/3737/314695/5cc69c01E1838df09/dd6dce681bd23031.jpg");
            BufferedImage image = ImageIO.read(img);
            //獲取圖片的寬、高
            System.out.println("Width: " + image.getWidth());
            System.out.println("Height: " + image.getHeight());
            //調(diào)整圖片大小為 400X400尺寸
            BufferedImage newImage = ImageUtils.resizeImage(image,400,400);
            //將緩沖區(qū)圖片保存到 F:/test/pic1.jpg (文件不存在會自動創(chuàng)建文件保存，文件存在會覆蓋原文件保存)
            ImageIO.write(newImage, "jpg", new File("F:/test/pic1.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.通過讀取圖片文件調(diào)整大小再保存：

import utils.ImageUtils;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class Test {
    public static void main(String[] args) {
        try {
            //讀取原始圖片
            BufferedImage image = ImageIO.read(new FileInputStream("F:/test/pic1.jpg"));
            System.out.println("Width: " + image.getWidth());
            System.out.println("Height: " + image.getHeight());
            //調(diào)整圖片大小
            BufferedImage newImage = ImageUtils.resizeImage(image,200,200);
            //圖像緩沖區(qū)圖片保存為圖片文件(文件不存在會自動創(chuàng)建文件保存，文件存在會覆蓋原文件保存)
            ImageIO.write(newImage, "jpg", new File("F:/test/pic2.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

3.MultipartFile類型的圖片文件調(diào)整大小再保存：

 public JSONObject imageSizeAdjustment(MultipartFile file) {
        JSONObject result = new JSONObject();
        try {
       	    //從MultipartFile 中獲取 byte[]
            byte[] bytes = file.getBytes();
            //byte[]轉(zhuǎn) InputStream 
            InputStream in = new ByteArrayInputStream(bytes);
            //讀取圖片輸入流為 BufferedImage 
            BufferedImage image = ImageIO.read(in);
            System.out.println("Width: " + image.getWidth());
            System.out.println("Height: " + image.getHeight());
            //調(diào)整圖片大小
            BufferedImage newImage = ImageUtils.resizeImage(image, 200, 200);
            //圖像緩沖區(qū)圖片保存為圖片文件(文件不存在會自動創(chuàng)建文件保存，文件存在會覆蓋原文件保存)
            ImageIO.write(newImage, "jpg", new File("F:/test/pic2.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        result.put("code", 1);
        result.put("note", "成功");
        return result;
    }

方式二：使用Thumbnailator

Thumbnailator是Java的開源圖像大小調(diào)整庫，它使用漸進式雙線性縮放。它支持JPG，BMP，JPEG，WBMP，PNG和GIF。

通過將以下Maven依賴項添加到我們的pom.xml中，將其包括在我們的項目中：

<dependency>
    <groupId>net.coobird</groupId>
    <artifactId>thumbnailator</artifactId>
    <version>0.4.11</version>
</dependency>

工具類ThumbnailsUtils：

import net.coobird.thumbnailator.Thumbnails;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class ThumbnailsUtils{
    private static final Logger logger = LoggerFactory.getLogger(ThumbnailsUtils.class);
    /**
     * 通過BufferedImage圖片流調(diào)整圖片大小
     */
    public static BufferedImage resizeImageOne(BufferedImage originalImage, int targetWidth, int targetHeight) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        Thumbnails.of(originalImage)
                .size(targetWidth, targetHeight)
                .outputFormat("JPEG")
                .outputQuality(1)
                .toOutputStream(outputStream);
        byte[] data = outputStream.toByteArray();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(data);
        return ImageIO.read(inputStream);
    }
   
    /**
     * BufferedImage圖片流轉(zhuǎn)byte[]數(shù)組
     */
    public static byte[] imageToBytes(BufferedImage bImage) {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            ImageIO.write(bImage, "jpg", out);
        } catch (IOException e) {
            logger.error("錯誤信息: ", e);
        }
        return out.toByteArray();
    }
    /**
     * byte[]數(shù)組轉(zhuǎn)BufferedImage圖片流
     */
    private static BufferedImage bytesToBufferedImage(byte[] ImageByte) {
        ByteArrayInputStream in = new ByteArrayInputStream(ImageByte);
        BufferedImage image = null;
        try {
            image = ImageIO.read(in);
        } catch (IOException e) {
            logger.error("錯誤信息: ", e);
        }
        return image;
    }
}