This article mainly introduces the relevant information of Java decompression and compressed folder examples. I hope this article can help everyone to realize such functions and master such methods. Friends in need can refer to it
Detailed examples of java decompression and compression folders
Note: JDK7 supports setting encoding and encoding format zipFile, zipInputStream, and zipOutputStream have added encoding formats , if jdk1.6 needs other package assistance
The following is the code for the built-in jdk compressed folder:
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public void dozip(String srcfile, String zipfile) throws IOException { String temp = ""; File src = new File(srcfile); File zipFile=new File(zipfile); //判断要压缩的文件存不存在 if (!src.exists()) { System.err.println("要压缩的文件不存在!"); System.exit(1); } //如果说压缩路径不存在,则创建 if (!zipFile.getParentFile().exists()) { zipFile.getParentFile().mkdirs(); // System.out.println("创建ok"); } // 封装压缩的路径 BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(zipfile)); //这里可以加入校验 //CheckedOutputStream cos = new CheckedOutputStream(bos,new CRC32()); //还可以设置压缩格式,默认UTF-8 Charset charset = Charset.forName("GBK"); ZipOutputStream zos = new ZipOutputStream(bos,charset); zip(src, zos, temp); //关闭流 zos.flush(); zos.close(); System.out.println("压缩完成!"); System.out.println("压缩文件的位置是:" + zipfile); // System.out.println("检验和:"+cos.getChecksum().getValue()); } private void zip(File file, ZipOutputStream zos, String temp) throws IOException { // 如果不加"/"将会作为文件处理,空文件夹不需要读写操作 if (file.isDirectory()) { String str = temp + file.getName() + "/"; zos.putNextEntry(new ZipEntry(str)); File[] files = file.listFiles(); for (File file2 : files) { zip(file2, zos, str); } } else { // System.out.println("当前文件的父路径:"+temp); ZipFile(file, zos, temp); } } private void ZipFile(File srcfile, ZipOutputStream zos, String temp) throws IOException { // 默认的等级压缩-1 // zos.setLevel(xxx); // 封装待压缩文件 BufferedInputStream bis = new BufferedInputStream(new FileInputStream( srcfile)); zos.putNextEntry(new ZipEntry(temp + srcfile.getName())); byte buf[] = new byte[1024]; int len; while ((len = bis.read(buf)) != -1) { zos.write(buf, 0, len); } //按标准需要关闭当前条目,不写也行 zos.closeEntry(); bis.close(); }The following is the decompression:
After testing, we found that no matter whether UTF-8 or GBK is used for compression, GBK can be used for decompression correctly! (The specific reason is still unclear)
//方法1: public void unZip(String zipfile) throws IOException { //检查是否是zip文件,并判断文件是否存在 checkFileName(zipfile); long startTime = System.currentTimeMillis(); File zfile=new File(zipfile); //获取待解压文件的父路径 String Parent=zfile.getParent()+"/"; FileInputStream fis=new FileInputStream(zfile); Charset charset = Charset.forName("GBK");//默认UTF-8 // CheckedInputStream cis = new CheckedInputStream(fis,new CRC32()); ZipInputStream zis = new ZipInputStream(fis,charset);// 输入源zip路径 ZipEntry entry=null; BufferedOutputStream bos=null; while ((entry=zis.getNextEntry())!=null) { if (entry.isDirectory()) { File filePath=new File(Parent+entry.getName()); //如果目录不存在,则创建 if (!filePath.exists()) { filePath.mkdirs(); } }else{ FileOutputStream fos=new FileOutputStream(Parent+entry.getName()); bos=new BufferedOutputStream(fos); byte buf[] = new byte[1024]; int len; while ((len = zis.read(buf)) != -1) { bos.write(buf, 0, len); } zis.closeEntry(); //关闭的时候会刷新 bos.close(); } } zis.close(); long endTime = System.currentTimeMillis(); System.out.println("解压完成!所需时间为:"+(endTime-startTime)+"ms"); // System.out.println("校验和:"+cis.getChecksum().getValue()); } private void checkFileName(String name) { //文件是否存在 if (!new File(name).exists()) { System.err.println("要解压的文件不存在!"); System.exit(1); } // 判断是否是zip文件 int index = name.lastIndexOf("."); String str=name.substring(index+1); if (!"zip".equalsIgnoreCase(str)) { System.err.println("不是zip文件,无法解压!"); System.exit(1); } }Method 2:
public void dozip(String zipfile) throws IOException { checkFileName(zipfile); long startTime = System.currentTimeMillis(); // 获取待解压文件的父路径 File zfile = new File(zipfile); String Parent = zfile.getParent() + "/"; // 设置,默认是UTF-8 Charset charset = Charset.forName("GBK"); ZipFile zip = new ZipFile(zipfile, charset); ZipEntry entry = null; //封装解压后的路径 BufferedOutputStream bos=null; //封装待解压文件路径 BufferedInputStream bis=null; Enumeration<ZipEntry> enums = (Enumeration<ZipEntry>) zip.entries(); while (enums.hasMoreElements()) { entry = enums.nextElement(); if (entry.isDirectory()) { File filePath = new File(Parent + entry.getName()); // 如果目录不存在,则创建 if (!filePath.exists()) { filePath.mkdirs(); } }else{ bos=new BufferedOutputStream(new FileOutputStream(Parent + entry.getName())); //获取条目流 bis =new BufferedInputStream(zip.getInputStream(entry)); byte buf[] = new byte[1024]; int len; while ((len = bis.read(buf)) != -1) { bos.write(buf, 0, len); } bos.close(); } } bis.close(); zip.close(); System.out.println("解压后的路径是:"+Parent); long endTime = System.currentTimeMillis(); System.out.println("解压成功,所需时间为:"+(endTime-startTime)+"ms"); } private void checkFileName(String name) { // 文件是否存在 if (!new File(name).exists()) { System.err.println("要解压的文件不存在!"); System.exit(1); } // 判断是否是zip文件 int index = name.lastIndexOf("."); String str = name.substring(index + 1); if (!"zip".equalsIgnoreCase(str)) { System.err.println("不是zip文件,无法解压!"); System.exit(1); } }
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