zip压缩文件到内存字节流和压缩文件到本地目录

女爷i 2022-04-08 12:49 221阅读 0赞

1、压缩文件到内存字节，不需要存储本地。  
2、压缩文件存储到本地目录

import lombok.extern.slf4j.Slf4j;
    import org.apache.commons.io.IOUtils;
    
    import java.io.*;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipOutputStream;
    
    @Slf4j
    public class ZipUtil {
    
     /**
         * 压缩到字节
         * @param sourceFileNames 源文件列表 k-目标文件名字 v-源文件字节流
         * @return 压缩到内存节流
         */
        public static byte[] compress(Map<String, byte[]> sourceFileNames) {
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(bout));
            try {
                for (String fileName : sourceFileNames.keySet()) {
                    log.info("当前压缩文件" + fileName);
                    zos.putNextEntry(new ZipEntry(fileName));
                    zos.write(sourceFileNames.get(fileName));
                    zos.closeEntry();
                }
            } catch (Exception e) {
                log.error("压缩文件异常：", e);
            } finally {
                if (zos != null) {
                    try {
                        zos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return bout.toByteArray();
        }
    
    
        /**
         * 压缩到文件
         * @param sourceFileNames 源文件列表
         * @param zipFileName 目标压缩文件
         */
        public static void compress(List<String> sourceFileNames, String zipFileName){
            byte[] buf = new byte[1024];
            File zipFile = new File(zipFileName);
            try {
                ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFile));
                for(int i = 0; i < sourceFileNames.size(); i++){
                    File sourceFile = new File(sourceFileNames.get(i));
                    FileInputStream fis = new FileInputStream(sourceFile);
                    zos.putNextEntry(new ZipEntry(sourceFile.getName()));
                    log.info("压缩当前文件：{}",sourceFile.getName());
                    int len;
                    while((len = fis.read(buf)) > 0){
                        zos.write(buf, 0, len);
                    }
                    zos.closeEntry();
                    fis.close();
                }
                zos.close();
                System.out.println("压缩完成");
            } catch (Exception e) {
                log.error("压缩文件异常：",e);
            }
        }
    
        public static void main(String[] args) throws Exception {
            // 压缩在内存
            Map<String, byte[]> sourceFileNames = new HashMap(16);
            byte[] b1 = IOUtils.toByteArray(new FileInputStream(new File("D:\\Desktop\\1.jpg")));
            byte[] b2 = IOUtils.toByteArray(new FileInputStream(new File("D:\\Desktop\\2.jpg")));
            byte[] b3 = IOUtils.toByteArray(new FileInputStream(new File("D:\\Desktop\\3.jpg")));
            byte[] b4 = IOUtils.toByteArray(new FileInputStream(new File("D:\\Desktop\\4.jpg")));
            //  a b c d 为制定压缩后的文件名字
            sourceFileNames.put("a.jpg", b1);
            sourceFileNames.put("b.jpg",b2);
            sourceFileNames.put("c.jpg",b3);
            sourceFileNames.put("d.jpg",b4);
            compress(sourceFileNames);
    
            // 压缩到本地文件夹
            List<String> sourceFileToLocal = new ArrayList<>();
            sourceFileToLocal.add("D:\\Desktop\\1.jpg");
            sourceFileToLocal.add("D:\\Desktop\\2.jpg");
            String zipFileName = "D:\\Desktop\\test\\test.zip";
            compress(sourceFileToLocal,zipFileName);
    
    
    // IOUtils 读取文件
    //        byte[] oriSign = IOUtils.toByteArray(new FileInputStream(new File("D:\\Desktop\\1031.ok")));
    //        System.out.println("原签名串"+new String(oriSign));
        }
    }