import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 文件对比复制
 * @author JIANGYOUYAO
 * @date 2021/6/7 0007
 */
public class filecopy {


    static  String targetFilePath="/mnt/sdc/webresource";

    static  String sourceFilePaht="/mnt/sdc/webresourceback";

    public static void main(String[] args) throws IOException {


        File sourceFile=new File(sourceFilePaht);
        traverseFolder(sourceFile);


    }


    public static  void traverseFolder(File file) throws IOException {

        if (file.exists()) {
            File[] files = file.listFiles();
            if (null == files || files.length == 0) {
                System.out.println("文件夹是空的!");
                return;
            } else {
                for (File file2 : files) {
                    if (file2.isDirectory()) {
                        //对比target是否存在
                        final String s = file2.getCanonicalPath().replaceAll("webresourceback", "webresource");
                        File f=new File(s);
                        if(!f.exists()){
                            System.out.println("复制文件:" + file2.getAbsolutePath());
                            f.mkdir();
                        }else{
                            System.out.println("文件:" + file2.getAbsolutePath()+"存在");
                        }
                        traverseFolder(file2);
                    } else {

                        //对比target是否存在,不存在则copy
                        final String s = file2.getCanonicalPath().replaceAll("webresourceback", "webresource");
                        File f=new File(s);
                        if(!f.exists()){
                            System.out.println("复制文件:" + file2.getAbsolutePath());
                            FileInputStream in=new FileInputStream(file2);
                            FileOutputStream out=new FileOutputStream(f);
                            byte[] buff=new byte[1024];
                            int length=in.read(buff);
                            while (length>0){
                                out.write(buff,0,length);
                                length=in.read(buff);
                            }
                            out.close();
                            in.close();

                        }else{
                            System.out.println("文件:" + file2.getAbsolutePath()+"存在");
                        }

                    }
                }
            }
        } else {
            System.out.println("文件不存在!");
        }
    }



}