前言
练习或小工具应用
需求
解压缩/压缩指定路径下或该路径下子文件夹内所有压缩文件/文件夹，支持ZIP压缩格式
思路
（解压缩为例）
①遍历指定文件下所有压缩包或子文件夹下的压缩包
②定义解压缩方法，对压缩包进行解压
③将解压缩文件夹放到指定路径
实现
Maven
工程依赖
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.21</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.21</version> </dependency>
代码实现
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.charset.Charset; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import java.util.zip.ZipOutputStream; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * 文件压缩工具类 */ public class ZipUtil { private static final int BUFFER_SIZE = 2 * 1024; /** * 是否保留原来的目录结构 * true: 保留目录结构; * false: 所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败) */ private static final boolean KeepDirStructure = true; private static final Logger log = LoggerFactory.getLogger(ZipUtil.class); /** * 压缩成ZIP * @param srcDir 压缩 文件/文件夹 路径 * @param outPathFile 压缩 文件/文件夹 输出路径+文件名 D:/xx.zip * @param isDelSrcFile 是否删除原文件: 压缩前文件 */ public static void toZip(String srcDir, String outPathFile,boolean isDelSrcFile) throws Exception { long start = System.currentTimeMillis(); FileOutputStream out = null; ZipOutputStream zos = null; try { out = new FileOutputStream(new File(outPathFile)); zos = new ZipOutputStream(out); File sourceFile = new File(srcDir); if(!sourceFile.exists()){ throw new Exception("需压缩文件或者文件夹不存在"); } compress(sourceFile, zos, sourceFile.getName()); if(isDelSrcFile){ delDir(srcDir); } log.info("原文件:{}. 压缩到:{}完成. 是否删除原文件:{}. 耗时:{}ms. ",srcDir,outPathFile,isDelSrcFile,System.currentTimeMillis()-start); } catch (Exception e) { log.error("zip error from ZipUtils: {}. ",e.getMessage()); throw new Exception("zip error from ZipUtils"); } finally { try { if (zos != null) {zos.close();} if (out != null) {out.close();} } catch (Exception e) {} } } /** * 递归压缩方法 * @param sourceFile 源文件 * @param zos zip输出流 * @param name 压缩后的名称 */ private static void compress(File sourceFile, ZipOutputStream zos, String name) throws Exception { byte[] buf = new byte[BUFFER_SIZE]; if (sourceFile.isFile()) { zos.putNextEntry(new ZipEntry(name)); int len; FileInputStream in = new FileInputStream(sourceFile); while ((len = in.read(buf)) != -1) { zos.write(buf, 0, len); } zos.closeEntry(); in.close(); } else { File[] listFiles = sourceFile.listFiles(); if (listFiles == null || listFiles.length == 0) { if (KeepDirStructure) { zos.putNextEntry(new ZipEntry(name + "/")); zos.closeEntry(); } } else { for (File file : listFiles) { if (KeepDirStructure) { compress(file, zos, name + "/" + file.getName()); } else { compress(file, zos, file.getName()); } } } } } /** * 解压文件到指定目录 */ @SuppressWarnings({ "rawtypes", "resource" }) public static void unZipFiles(String zipPath, String descDir) throws IOException { log.info("文件:{}. 解压路径:{}. 解压开始.",zipPath,descDir); long start = System.currentTimeMillis(); try{ File zipFile = new File(zipPath); System.err.println(zipFile.getName()); if(!zipFile.exists()){ throw new IOException("需解压文件不存在."); } File pathFile = new File(descDir); if (!pathFile.exists()) { pathFile.mkdirs(); } ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK")); for (Enumeration entries = zip.entries(); entries.hasMoreElements();) { ZipEntry entry = (ZipEntry) entries.nextElement(); String zipEntryName = entry.getName(); System.err.println(zipEntryName); InputStream in = zip.getInputStream(entry); String outPath = (descDir + File.separator + zipEntryName).replaceAll("\\*", "/"); System.err.println(outPath); // 判断路径是否存在,不存在则创建文件路径 File file = new File(outPath.substring(0, outPath.lastIndexOf('/'))); if (!file.exists()) { file.mkdirs(); } // 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压 if (new File(outPath).isDirectory()) { continue; } // 输出文件路径信息 OutputStream out = new FileOutputStream(outPath); byte[] buf1 = new byte[1024]; int len; while ((len = in.read(buf1)) > 0) { out.write(buf1, 0, len); } in.close(); out.close(); } log.info("文件:{}. 解压路径:{}. 解压完成. 耗时:{}ms. ",zipPath,descDir,System.currentTimeMillis()-start); }catch(Exception e){ log.info("文件:{}. 解压路径:{}. 解压异常:{}. 耗时:{}ms. ",zipPath,descDir,e,System.currentTimeMillis()-start); throw new IOException(e); } } // 删除文件或文件夹以及文件夹下所有文件 public static void delDir(String dirPath) throws IOException { log.info("删除文件开始:{}.",dirPath); long start = System.currentTimeMillis(); try{ File dirFile = new File(dirPath); if (!dirFile.exists()) { return; } if (dirFile.isFile()) { dirFile.delete(); return; } File[] files = dirFile.listFiles(); if(files==null){ return; } for (int i = 0; i < files.length; i++) { delDir(files[i].toString()); } dirFile.delete(); log.info("删除文件:{}. 耗时:{}ms. ",dirPath,System.currentTimeMillis()-start); }catch(Exception e){ log.info("删除文件:{}. 异常:{}. 耗时:{}ms. ",dirPath,e,System.currentTimeMillis()-start); throw new IOException("删除文件异常."); } } }
