Java 读取网络图片存储到本地并生成缩略图

package com.cn.beauty.task;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class createLocalImage {
	// 需要保存到本地的根路径
    private static String basePath = "F:/";

    public static void main(String[] args) {
    	// 网页图片路径
        String destUrl = "http://5b0988e595225.cdn.sohucs.com/images/20200215/349bb3cb88b744dcb67f37dba2f71abf.jpeg";
        String filePath = createLocalImageMethod(destUrl);
        System.out.println("生成的相对文件路径为" + filePath);
    }

    private static String createLocalImageMethod(String destUrl) {
        FileOutputStream fos = null;
        BufferedInputStream bis = null;
        HttpURLConnection httpUrl = null;
        URL url = null;
        int BUFFER_SIZE = 1024;
        byte[] buf = new byte[BUFFER_SIZE];
        int size = 0;
        String filePath = "";
        try {
            System.out.println("原始图片URL为：" + destUrl);
            String[] fileNameArray = destUrl.split("\\/");
            if (fileNameArray.length > 1) {
                String fileName = fileNameArray[fileNameArray.length - 1];
                filePath = "images/" + fileName;
                File file = new File(basePath + filePath);
                if (!file.exists()) {
                    url = new URL(destUrl);
                    httpUrl = (HttpURLConnection) url.openConnection();
                    httpUrl.connect();
                    bis = new BufferedInputStream(httpUrl.getInputStream());
                    fos = new FileOutputStream(basePath + filePath);
                    while ((size = bis.read(buf)) != -1) {
                        fos.write(buf, 0, size);
                    }
                    fos.flush();
                }
                // 后续对图片进行缩略图处理，见后面代码
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassCastException e) {
            e.printStackTrace();
        } finally {
            try {
                fos.close();
                bis.close();
                httpUrl.disconnect();
            } catch (IOException e) {
            } catch (NullPointerException e) {
            }
        }
        return filePath;
    }
}

<dependency>
      <groupId>net.coobird</groupId>
      <artifactId>thumbnailator</artifactId>
      <version>0.4.8</version>
</dependency>

    String thumbName = fileName.split("\\.")[0] + "_thumb." + fileName.split("\\.")[1];
    String thumbPath = basePath + filePath.replace(fileName, thumbName);
    //将要转换出的小图文件
    File fo = new File(thumbPath);
    if (fo.exists()) {
         return thumbPath;
    }
    // 第一个参数是原始图片的路径，第二个是缩略图的路径
    Thumbnails.of(basePath + filePath).size(120, 120).toFile(thumbPath);
    System.out.println("生成的缩略图路径为：" + thumbPath);

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ResizeImage {
    public static void main(String[] args) throws IOException {
        //windows路径,linux环境下相应修改
        String outputFolder = "D:\\test\\";
        String fileName = "D:\\test\\test.jpg";
        ResizeImage r = new ResizeImage();
        int toWidth=220,toHeight=220;
        BufferedImage imageList = r.getImageList(fileName,new String[] {"jpg","png","gif"});
        r.writeHighQuality("newFile.jpg",r.zoomImage(imageList,toWidth,toHeight),outputFolder);
    }
    /**
     * @Description: 取得图片对象
     * @param 要转化的图像的文件夹,就是存放图像的文件夹路径
     * @date 2017年5月7日10:48:27
     */
    public BufferedImage zoomImage(BufferedImage im, int toWidth , int toHeight) {
        BufferedImage result = new BufferedImage(toWidth, toHeight, BufferedImage.TYPE_INT_RGB);
        result.getGraphics().drawImage(im.getScaledInstance(toWidth, toHeight, java.awt.Image.SCALE_SMOOTH), 0, 0, null);
        return result;
    }
    /**
     * @Description: 取得图片对象
     * @param 要转化的图像的文件夹,就是存放图像的文件夹路径
     * @date 2017年5月7日10:48:27
     */
    public BufferedImage getImageList(String ImgList, String[] type) throws IOException{
        Map<String,Boolean> map = new HashMap<String, Boolean>();
        for(String s : type) {
            map.put(s,true);
        }
        BufferedImage imageList = null;
        File file = null;
        file = new File(ImgList);
        try{
            if(file.length() != 0 && map.get(getExtension(file.getName())) != null ){
                imageList = javax.imageio.ImageIO.read(file);
            }
        }catch(Exception e){
            imageList = null;
        }
        return imageList;
    }
    /**
     * 把图片写到磁盘上
     * @param im
     * @param path      图片写入的文件夹地址
     * @param fileName  写入图片的名字
     * @date 2017年5月7日10:48:27
     */
    public boolean writeToDisk(BufferedImage im, String path, String fileName) {
        File f = new File(path + fileName);
        String fileType = getExtension(fileName);
        if (fileType == null)
            return false;
        try {
            ImageIO.write(im, fileType, f);
            im.flush();
            return true;
        } catch (IOException e) {
            return false;
        }
    }
    /**
     * @Description: 生成图片
     * @param String path , BufferedImage im, String fileFullPath
     * @date 2017年5月7日10:48:27
     */
    public boolean writeHighQuality(String path , BufferedImage im, String fileFullPath) throws IOException {
        FileOutputStream newimage = null;
        try {
            // 输出到文件流
            newimage = new FileOutputStream(fileFullPath+path);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);
            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);
            // 压缩质量
            jep.setQuality(1f, true);
            encoder.encode(im, jep);
            //近JPEG编码
            newimage.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }
    /**
     * @Description: 取文件名的后缀
     * @param String fileName 格式如：cn1100000213EA_1_xnl.jpg
     * @date 2017年5月7日10:48:27
     */
    public String getExtension(String fileName) {
        try {
            return fileName.split("\\.")[fileName.split("\\.").length - 1];
        } catch (Exception e) {
            return null;
        }
    }