JAVA下载图片压缩zip

Posted 2023-04-24 美宰可

1. 支持多张图片下载

/**
 * 下载附件zip
 */
@PostMapping("downloadZip")
public void downloadZip(@RequestBody ShipmentAnnexVo shipmentAnnexVo, HttpServletRequest request, HttpServletResponse response) 
    shipmentAnnexService.downloadZip(shipmentAnnexVo, request, response);


2. serviceImpl实现逻辑

// zip文件名
String zipName = DateUtil.getNowDateYMDHMS();

try 
    // 创建zip输出流,输出到客户端
    ZipOutputStream out = new ZipOutputStream(response.getOutputStream());
    zipName = URLEncoder.encode(zipName, "UTF-8");

    response.reset();
    response.setCharacterEncoding("UTF-8");
    // 不同类型的文件对应不同的MIME类型
    response.setContentType("application/octet-stream");
    // inline在浏览器中直接显示，不提示用户下载
    // attachment弹出对话框，提示用户进行下载保存本地
    // 默认为inline方式
    response.setHeader("Content-Disposition", "attachment;filename=" + zipName);

    for (ShipmentAnnex annex : annexList) 
        InputStream in = tencentMinioManage.get(bucketName, annex.getAnnexFileName());
        String fileName = annex.getOriginFileName().contains(".") ? annex.getOriginFileName() : annex.getOriginFileName() + ".jpg";
        out.putNextEntry(new ZipEntry(fileName));

        int len;
        byte[] buf = new byte[4096];
        while ((len = in.read(buf)) > 0) 
            out.write(buf, 0, len);
        
        out.closeEntry();
        in.close();
    
    out.close();

 catch (Exception e) 
    throw new BusinessException("下载ZIP异常!" + e.getMessage());

Java 将文件，文件夹打入压缩包zip，rar

批量下载经常会有将文件打包下载的需求，比如批量下载图片

今天就分享一个java将文件夹中的所有文件（包括文件夹，递归）打包成压缩包（支持rar和zip）

先看效果，测试目录

李四文件夹下有文件夹和，文件和一个空文件夹（空文件夹打包到压缩包显示图标和类型都有点问题，这个还没找的解决方案，可以不打进去）

压缩包截图（打包空目录）

不打包空目录（rar）

依赖

		<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.9</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.ArrayUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipUtil 

    public static void main(String[] args) throws Exception 
        String dir = "E:\\\\zip";
        String zip = "E:\\\\target.zip";
        String rar = "E:\\\\target.rar";
        zip(dir, zip);
        zip(dir, rar, true);
    


    /**
     * 打包
     *
     * @param dir     要打包的目录
     * @param zipFile 打包后的文件路径
     * @throws Exception
     */
    public static void zip(String dir, String zipFile) throws Exception 
        zip(dir, zipFile, false);
    

    /**
     * 打包
     *
     * @param dir            要打包的目录
     * @param zipFile        打包后的文件路径
     * @param includeBaseDir 是否包括最外层目录
     * @throws Exception
     */
    public static void zip(String dir, String zipFile, boolean includeBaseDir) throws Exception 
        if (zipFile.startsWith(dir)) 
            throw new RuntimeException("打包生成的文件不能在打包目录中");
        
        try (ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile))) 
            File fileDir = new File(dir);
            String baseDir = "";
            if (includeBaseDir) 
                baseDir = fileDir.getName();
            
            compress(out, fileDir, baseDir);
        
    

    public static void compress(ZipOutputStream out, File sourceFile, String base) throws Exception 

        if (sourceFile.isDirectory()) 
            base = base.length() == 0 ? "" : base + File.separator;
            File[] files = sourceFile.listFiles();
            if (ArrayUtils.isEmpty(files)) 
                // todo 打包空目录
                // out.putNextEntry(new ZipEntry(base));
                return;
            
            for (File file : files) 
                compress(out, file, base + file.getName());
            
         else  
            out.putNextEntry(new ZipEntry(base));
            try (FileInputStream in = new FileInputStream(sourceFile)) 
                IOUtils.copy(in, out);
             catch (Exception e) 
                throw new RuntimeException("打包异常: " + e.getMessage());
            
        
    

参考文献

https://www.cnblogs.com/tobiasy/p/8258419.html