package com.ots.project.tool.exam;
import lombok.extern.slf4j.Slf4j;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.Objects;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

 @Slf4j
public class ZipUtil {
    private static final int BUFFER_SIZE = 2 * 1024;
    
    public static void toZip(String srcDir, OutputStream out, boolean keepDirStructure)
            throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            compress(sourceFile, zos, sourceFile.getName(), keepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    public static void toZip(List<File> srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                zipFile(zos, srcFile);
            }
            long end = System.currentTimeMillis();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    private static void zipFile(ZipOutputStream zos, File srcFile) throws IOException {
        FileInputStream in = null;
        try {
            in = new FileInputStream(srcFile);
            byte[] buf = new byte[BUFFER_SIZE];
            zos.putNextEntry(new ZipEntry(srcFile.getName()));
            int len;
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
        } catch (Exception e) {
            log.error("zipFile error:{}",e.getMessage(),e);
        }finally {
            zos.closeEntry();
            if (Objects.nonNull(in)) {
                in.close();
            }
        }
    }
    
    private static void compress(File sourceFile, ZipOutputStream zos, String name,
                                 boolean keepDirStructure) throws Exception {
        byte[] buf = new byte[BUFFER_SIZE];
        if (sourceFile.isFile()) {
            
            zos.putNextEntry(new ZipEntry(name));
            
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                
                if (keepDirStructure) {
                    
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    
                    zos.closeEntry();
                }
            } else {
                for (File file : listFiles) {
                    
                    if (keepDirStructure) {
                        
                        
                        compress(file, zos, name + "/" + file.getName(), keepDirStructure);
                    } else {
                        compress(file, zos, file.getName(), keepDirStructure);
                    }
                }
            }
        }
    }
    public static void main(String[] args) throws Exception {
        
        FileOutputStream fos1 = new FileOutputStream(new File("H:\\xuweichao.zip"));
        ZipUtil.toZip("H:\\docTmp", fos1, true);
    }
}