文件的工具类

Posted 2020-11-24 zengqinghong

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文件压缩和解压

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import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class FileZipOrUnZip {

    /**
     * @param sourceFullPath 源文件全路径
     * @param zipFullPath 压缩后的全路径
     * 压缩文件
     * @throws Exception
     */
    public static void zip(String sourceFullPath, String zipFullPath) throws Exception{
        System.out.println("压缩中...");
        ZipOutputStream out = new ZipOutputStream( new FileOutputStream(zipFullPath));
        File sourceFile = new File(sourceFullPath);
        compress(out,sourceFile,sourceFile.getName());
        out.close();
        System.out.println("压缩完成");
    }

    public static void compress(ZipOutputStream out, File sourceFile,String base) throws Exception{
        if (!sourceFile.isDirectory()) {
            out.putNextEntry( new ZipEntry(base) );
            FileInputStream fos = new FileInputStream(sourceFile);
            BufferedInputStream bis = new BufferedInputStream(fos);
            int tag;
            System.out.println(base);
            while((tag=bis.read())!=-1){
                out.write(tag);
            }
            bis.close();
            fos.close();
            return;
        }

        File[] flist = sourceFile.listFiles();
        if(flist.length == 0){
            System.out.println(base+"/");
            out.putNextEntry(new ZipEntry(base+"/") );
            return;
        }
        for(int i=0;i<flist.length;i++){
            compress(out,flist[i],base+"/"+flist[i].getName());
        }
    }




    /**
     * zip解压
     * @param srcFile        zip源文件
     * @param destDirPath     解压后的目标文件夹
     */
    public static void unZip(File srcFile, String destDirPath) throws RuntimeException {
        long start = System.currentTimeMillis();
        // 判断源文件是否存在
        if (!srcFile.exists()) {
            throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
        }
        // 开始解压
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(srcFile);
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                System.out.println("解压" + entry.getName());
                // 如果是文件夹，就创建个文件夹
                if (entry.isDirectory()) {
                    String dirPath = destDirPath + "/" + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                } else {
                    // 如果是文件，就先创建一个文件，然后用io流把内容copy过去
                    File targetFile = new File(destDirPath + "/" + entry.getName());
                    // 保证这个文件的父文件夹必须要存在
                    if(!targetFile.getParentFile().exists()){
                        targetFile.getParentFile().mkdirs();
                    }
                    targetFile.createNewFile();
                    // 将压缩文件内容写入到这个文件中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[1024];
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }
                    fos.close();
                    is.close();
                }
            }
            long end = System.currentTimeMillis();
            System.out.println("解压完成，耗时：" + (end - start) +" ms");
        } catch (Exception e) {
            throw new RuntimeException("unzip error from ZipUtils", e);
        } finally {
            if(zipFile != null){
                try {
                    zipFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) throws Exception {
//        zip("D:git_test	est", "D:git_test	est\test1.zip");

        unZip(new File("D:\git_test\test\test1.zip"), "D:\git_test\test");
    }

}