需求：壓縮目標(biāo)文件夾，保持目錄結(jié)構(gòu)不變，生成一個(gè)zip

回答：智能給出的代碼

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
 public class ZipDirectory {
    public static void main(String[] args) {
        String sourceFolder = "源文件夾路徑";
        String zipFilePath = "壓縮文件路徑";
        zipDirectory(sourceFolder, zipFilePath);
    }
     private static void zipDirectory(String sourceFolder, String zipFilePath) {
        try {
            FileOutputStream fos = new FileOutputStream(zipFilePath);
            ZipOutputStream zos = new ZipOutputStream(fos);
             File sourceFile = new File(sourceFolder);
            addDirectoryToZip(zos, sourceFile, "");
             zos.close();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
     private static void addDirectoryToZip(ZipOutputStream zos, File sourceFile, String parentDirectoryName) throws IOException {
        File[] files = sourceFile.listFiles();
        byte[] buffer = new byte[1024];
        int bytesRead;
         for (File file : files) {
            if (file.isDirectory()) {
                String directoryName = file.getName();
                addDirectoryToZip(zos, file, parentDirectoryName + "/" + directoryName);
                continue;
            }
             FileInputStream fis = new FileInputStream(file);
            String entryName = parentDirectoryName + "/" + file.getName();
            ZipEntry zipEntry = new ZipEntry(entryName);
            zos.putNextEntry(zipEntry);
             while ((bytesRead = fis.read(buffer)) != -1) {
                zos.write(buffer, 0, bytesRead);
            }
             fis.close();
            zos.closeEntry();
        }
    }
}

運(yùn)行：

目錄結(jié)構(gòu)：

image.png

壓縮包目錄結(jié)構(gòu)：

image.png

分析：

1.優(yōu)點(diǎn)
直接運(yùn)行是沒(méi)有問(wèn)題的，addDirectoryToZip這個(gè)方法，碰到文件夾就遞歸，碰到文件就進(jìn)行寫(xiě)操作。代碼還比較簡(jiǎn)潔。
2.不足

• 缺少為空的處理
  例如空文件夾C，方法會(huì)忽略掉
• 缺少異常情況考慮
  例如傳入zipFilePath上級(jí)的目錄不存在，會(huì)報(bào)錯(cuò)

3.改進(jìn)

    /**
     * 確保path路徑文件存在
     * @param absolutePath 文件或者目錄的全路徑
     * @param directoryFlag 是否是目錄
     */
    public static void makeSurePathExist(String absolutePath, Boolean directoryFlag) {
        File file = new File(absolutePath);
        if (!file.exists()) {
            if (directoryFlag) {
                file.mkdirs();
                return;
            }
            File parentDir = file.getParentFile();
            if (!parentDir.exists()) {
                parentDir.mkdirs();
            }
            try {
                file.createNewFile();
            } catch (Exception e) {
                // 拋業(yè)務(wù)異常
            }
        }
    }

    private static void zipDirectory(String sourceFolder, String zipFilePath) {
        // 保證zipFilePath存在
        makeSurePathExist(zipFilePath);
        try(ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFilePath))) {
            addDirectoryToZip(zos, new File(sourceFolder), "");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void addDirectoryToZip(ZipOutputStream zos, File sourceFile, String parentDirectoryName) throws IOException {
        File[] files = sourceFile.listFiles();
        byte[] buffer = new byte[1024];
        int bytesRead;
        // 處理文件夾為空情況
        if (files.length == 0) {
            zos.putNextEntry(new ZipEntry(parentDirectoryName + "/"));
        }
        for (File file : files) {
            if (file.isDirectory()) {
                String directoryName = file.getName();
                addDirectoryToZip(zos, file, parentDirectoryName + "/" + directoryName);
                continue;
            }
            FileInputStream fis = new FileInputStream(file);
            String entryName = parentDirectoryName + "/" + file.getName();
            ZipEntry zipEntry = new ZipEntry(entryName);
            zos.putNextEntry(zipEntry);
            while ((bytesRead = fis.read(buffer)) != -1) {
                zos.write(buffer, 0, bytesRead);
            }
            fis.close();
            zos.closeEntry();
        }
    }