一、使用的API：
创建zip对象
// localFileName输出的本地文件名 ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(localFileName));
将要压缩的文件名输入
// 要压缩的单个文件名 zipOut.putNextEntry(new ZipEntry(fileName));
将文件的流，写入zipOut中
zipOut.write(buffer, 0, len);
关闭流
zipOut.close();
二、注意点
- 输入后，要关闭
ZipOutputStream流，否则文件打开会失败。
二、工具类：
import lombok.extern.slf4j.Slf4j; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.util.List; import java.util.Objects; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; @Slf4j public class CompressDownloadUtil { /** * 将多个文件压缩到指定输出流中 * * @param files 需要压缩的文件列表 * @param outputStream 压缩到指定的输出流 * @author hongwei.lian * @date 2018年9月7日 下午3:11:59 */ public static void compressZip(List<File> files, OutputStream outputStream) { ZipOutputStream zipOutStream = null; try { //-- 包装成ZIP格式输出流 zipOutStream = new ZipOutputStream(new BufferedOutputStream(outputStream)); // -- 设置压缩方法 zipOutStream.setMethod(ZipOutputStream.DEFLATED); //-- 将多文件循环写入压缩包 for (int i = 0; i < files.size(); i++) { File file = files.get(i); FileInputStream filenputStream = new FileInputStream(file); byte[] data = new byte[(int) file.length()]; filenputStream.read(data); //-- 添加ZipEntry，并ZipEntry中写入文件流，这里，加上i是防止要下载的文件有重名的导致下载失败 zipOutStream.putNextEntry(new ZipEntry(i + file.getName())); zipOutStream.write(data); filenputStream.close(); zipOutStream.closeEntry(); } } catch (IOException e) { log.error("error,msg:{}", e.getMessage()); } finally { try { if (Objects.nonNull(zipOutStream)) { zipOutStream.flush(); zipOutStream.close(); } if (Objects.nonNull(outputStream)) { outputStream.close(); } } catch (IOException e) { log.error("error,msg:{}", e.getMessage()); } } } /** * 下载单个文件到本地 * * @param localFileName 本地文件名称 * @param is 源文件-输入流 * @param fileName 源文件-文件名 */ public static void zipOneFile(String localFileName, InputStream is, String fileName) { ZipOutputStream zipOut = null; try { zipOut = new ZipOutputStream(new FileOutputStream(localFileName)); zipOut.putNextEntry(new ZipEntry(fileName)); // 输出文件 int len = 0; byte[] buffer = new byte[1024]; while ((len = is.read(buffer)) > 0) { zipOut.write(buffer, 0, len); } } catch (IOException e) { log.error("获取文件失败:{}", e.getMessage()); } finally { if (is != null) { try { is.close(); } catch (IOException e) { log.error("关闭流失败:{}", e.getMessage()); } } } } /** * 压缩多个文件到本地 * * @param localFileName 本地文件名 * @param files File文件集合 */ public static void zipFiles(String localFileName, List<File> files) { ZipOutputStream zipOut = null; try { zipOut = new ZipOutputStream(new FileOutputStream(localFileName)); for (File file : files) { FileInputStream fis = null; try { fis = new FileInputStream(file); // 单个文件名称 zipOut.putNextEntry(new ZipEntry(file.getName())); // 输出文件 int len = 0; byte[] buffer = new byte[1024]; while ((len = fis.read(buffer)) > 0) { zipOut.write(buffer, 0, len); } } catch (Exception e) { log.error("压缩文件失败:{}", e.getMessage()); } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { log.error("关闭流失败:{}", e.getMessage()); } } } } } catch (FileNotFoundException e) { throw new RuntimeException(e); } finally { if (zipOut != null) { try { zipOut.close(); } catch (IOException e) { log.error("关闭流失败:{}", e.getMessage()); } } } } }
