替换指定文件夹图片，并保留原来尺寸

梦里梦外; 2022-06-17 10:36 170阅读 0赞

如题，有时需要用图片替换原来文件夹图片，但尺寸想保持不变，于是乎就写了以下代码片断，记录一下，留用。

import java.awt.Image;
    import java.awt.image.BufferedImage;
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.FilenameFilter;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.io.UnsupportedEncodingException;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.net.URLConnection;
    import java.net.URLEncoder;
    import java.util.Date;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    import javax.imageio.ImageIO;
    
    
    /** * */
    
    /** * @author zhouzhengwei * */
    public class TestClass { 
    
        /** * @param args * @throws UnsupportedEncodingException */
        public static void main(final String[] args) throws Exception
        {
            //要替换的目录
            final File file1 = new File(
                    "/Users/zhouzhengwei/Downloads/hybris6.2/hybris/bin/ext-customer-experience/personalizationsampledataaddon/resources/personalizationsampledataaddon/import/contentCatalogs/electronicsContentCatalog/images");
            final File file11 = new File(
                    "/Users/zhouzhengwei/Downloads/hybris6.2/hybris/bin/ext-data/electronicsstore/resources/electronicsstore/import/sampledata");
            //用这个目录下的图片替换原来目录
            final File file2 = new File("/Users/zhouzhengwei/Documents/t3");
            HttpGet("汽车", "/Users/zhouzhengwei/Documents/t3");
    
    
            final File[] listFiles2 = file2.listFiles(new FilenameFilter()
            {
                public boolean accept(final File dir, final String name)
                {
                    boolean b = false;
                    if (name.endsWith("jpg") || name.endsWith("jpeg"))
                    {
                        try
                        {
                            final BufferedInputStream in = new BufferedInputStream(new FileInputStream(dir + File.separator + name));
                            //字节流转图片对象
                            final Image bi = ImageIO.read(in);
                            //获取图像的高度，宽度
                            final int height = bi.getHeight(null);
                            final int width = bi.getWidth(null);
                            if ((float) width / (float) height > 2)
                            {
                                b = true;
                            }
                            in.close();
                        }
                        catch (final Exception e)
                        {
                            //e.printStackTrace();
                        }
                        return b;
                    }
                    else
                    {
                        return false;
                    }
                }
            });
    
            final File[] listFiles3 = file2.listFiles(new FilenameFilter()
            {
                public boolean accept(final File dir, final String name)
                {
                    boolean b = false;
                    if (name.endsWith("jpg") || name.endsWith("jpeg"))
                    {
                        try
                        {
                            final BufferedInputStream in = new BufferedInputStream(new FileInputStream(dir + File.separator + name));
                            //字节流转图片对象
                            final Image bi = ImageIO.read(in);
                            //获取图像的高度，宽度
                            final int height = bi.getHeight(null);
                            final int width = bi.getWidth(null);
                            if ((float) width / (float) height < 2)
                            {
                                b = true;
                            }
                            in.close();
                        }
                        catch (final Exception e)
                        {
                            //
                        }
                        return b;
                    }
                    else
                    {
                        return false;
                    }
                }
            });
    
            disF(file1, listFiles2, listFiles3);
            disF(file11, listFiles2, listFiles3);
        }
    
        public static void disF(final File f, final File[] listFiles2, final File[] listFiles3)
        {
            if (f.isDirectory())
            {
                final File[] listFiles = f.listFiles(new FilenameFilter()
                {
                    public boolean accept(final File dir, final String name)
                    {
                        return !name.endsWith("DS_Store");
                    }
    
                });
                for (int i = 0; i < listFiles.length; i++)
                {
                    disF(listFiles[i], listFiles2, listFiles3);
                }
            }
            else
            {
                disD(f, listFiles2, listFiles3);
            }
        }
    
        public static void disD(final File f, final File[] listFiles2, final File[] listFiles3)
        {
            if (!f.getName().endsWith("jpg"))
            {
                return;
            }
    
            //选择要替换图片的尺寸
            // if (!(f.getName().contains("960x80") || f.getName().contains("770x80") || f.getName().contains("480x118") || f.getName()
            // .contains("1400x80")))
            // { 
            // return;
            // }
    
            try
            {
                final BufferedInputStream in = new BufferedInputStream(new FileInputStream(f));
                //字节流转图片对象
                final Image bi = ImageIO.read(in);
                //获取图像的高度，宽度
                final int height = bi.getHeight(null);
                final int width = bi.getWidth(null);
    
    
                final int k = (int) (Math.random() * (listFiles3.length));
                File f2 = listFiles3[k];
                final float ff = (float) width / (float) height;
                if (ff >= 2)
                {
                    if (listFiles2 == null || listFiles2.length == 0)
                    {
                        final int kk = (int) (Math.random() * (listFiles3.length));
                        f2 = listFiles3[kk];
                    }
                    else
                    {
                        final int kk = (int) (Math.random() * (listFiles2.length));
                        f2 = listFiles2[kk];
                    }
    
                }
    
                if (ff == 1)
                {
                    final int kk = (int) (Math.random() * (listFiles3.length));
                    f2 = listFiles3[kk];
                }
    
    
                final BufferedInputStream in2 = new BufferedInputStream(new FileInputStream(f2));
                final Image bi2 = ImageIO.read(in2);
                final int height2 = bi2.getHeight(null);
                final int width2 = bi2.getWidth(null);
    
                float w = 0;
                float h = 0;
    
                //构建图片流
                final BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                //绘制改变尺寸后的图
                if ((float) width / (float) height > (float) width2 / (float) height2)
                {
                    w = width;
                    h = height2 * ((float) width / (float) width2);
                }
                else
                {
                    h = height;
                    w = width2 * ((float) height / (float) height2);
                }
                tag.getGraphics().drawImage(bi2, 0, 0, (int) w, (int) h, null);
    
                //输出流
                final BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f));
                System.out.println(f.getAbsolutePath());
                ImageIO.write(tag, "jpg", out);
                in.close();
                in2.close();
                out.close();
            }
            catch (final Exception e)
            {
                e.printStackTrace();
            }
    
        }
    
        public static String HttpGet(final String str, final String dir) throws Exception
        {
    
            final String urlStr = "http://image.baidu.com/channel/listjson?fr=channel&tag1=" + URLEncoder.encode(str, "utf-8")
                    + "&tag2=" + URLEncoder.encode("全部", "utf-8")
                    + "&sorttype=1&pn=0&rn=5&ie=utf8&oe=utf-8&app=img.browse.channel.general";
            final URL url = new URL(urlStr);
            final URLConnection urlConnection = url.openConnection(); // 打开连接 
    
            System.out.println(urlConnection.getURL().toString());
    
            final BufferedReader br = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "utf-8")); // 获取输入流 
            String line = null;
            final StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null)
            {
                sb.append(line);
            }
            br.close();
    
            //System.out.println(sb.toString());
            final String regEx = "image_url\":\"([^\"]+\")";
            final Pattern p = Pattern.compile(regEx);
            final Matcher m = p.matcher(sb.toString());
            while (m.find())
            {
                final String replaceAll = m.group().replaceFirst("image_url\":\"", "").replaceAll("jpg\"", "jpg");
                writeFile(replaceAll, dir + File.separator + new Date().getTime() + ".jpg");
                System.out.println(replaceAll);
            }
            return sb.toString();
        }
    
    
        public static void writeFile(final String strUrl, final String fileName)
        {
            URL url = null;
            try
            {
                url = new URL(strUrl);
            }
            catch (final MalformedURLException e2)
            {
                e2.printStackTrace();
            }
            InputStream is = null;
            try
            {
                is = url.openStream();
            }
            catch (final IOException e1)
            {
                e1.printStackTrace();
            }
            OutputStream os = null;
    
            try
            {
                os = new FileOutputStream(fileName);
                int bytesRead = 0;
                final byte[] buffer = new byte[8192];
                while ((bytesRead = is.read(buffer, 0, 8192)) != -1)
                {
                    os.write(buffer, 0, bytesRead);
                }
            }
            catch (final Exception e)
            {
                //
            }
        }
    }