一、概述
主要实现解压压缩包，拿到压缩包中每个文件。
二、思路
针对压缩包的操作，首先需要拿到压缩包文件的流，然后利用第三方工具将流实例化，调用next方法迭代，然后分别操作压缩包中的单个文件。
三、代码实现
1.zip实现
jdk支持对zip流的操作，相关依赖在java.util.zip下
// 获取本地zip包public void unzipByPath() {try {String localPath = "D:\\文件.zip";File file = new File(localPath);ZipInputStream zin; // 创建ZipInputStream对象InputStream inputStream = new FileInputStream(file);zin = new ZipInputStream(inputStream, Charset.forName("GBK")); // 实例化对象，指明要解压的文件ZipEntry entry;while ((entry = zin.getNextEntry()) != null) {System.out.println(zipEntry.getName());BufferedInputStream bs = new BufferedInputStream(zin);// 将文件信息写到byte数组中byte[] bytes = new byte[(int) entry.getSize()];bs.read(bytes, 0, (int) entry.getSize());if ("zip".equals(entry.getName().substring(entry.getName().lastIndexOf(".") + 1))) {ZipInputStream secondZip = new ZipInputStream(new ByteArrayInputStream(bytes), Charset.forName("GBK"));// 循环解压}}zin.close();} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}}
// 获取远程zip包public void unzipByUrl() {String fileUrl = "https://localhost:80/group1/M00/6D/A3/wKjScWE7PxqAQfUnAAGcIyZy0ZU422.zip";try {URL url = new URL(fileUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();int resultCode = conn.getResponseCode();if (200 == resultCode) {ZipInputStream zipInputStream = new ZipInputStream(conn.getInputStream(), Charset.forName("GBK"));ZipEntry zipEntry;while ((zipEntry = zipInputStream.getNextEntry()) != null) {System.out.println(zipEntry.getName());BufferedInputStream bs = new BufferedInputStream(zipInputStream);// 将文件信息写到byte数组中byte[] bytes = new byte[(int) zipEntry.getSize()];bs.read(bytes, 0, (int) zipEntry.getSize());if ("zip".equals(zipEntry.getName().substring(zipEntry.getName().lastIndexOf(".") + 1))) {ZipInputStream secondZip = new ZipInputStream(new ByteArrayInputStream(bytes), Charset.forName("GBK"));// 循环解压}}}} catch (IOException e) {e.printStackTrace();}}
2.rar实现
1）依赖
<!-- 解压rar所需的依赖 --><dependency><groupId>com.github.junrar</groupId><artifactId>junrar</artifactId><version>4.0.0</version></dependency>
2）代码
// 获取本地rarpublic void unRarByPath() {String rarPath = "D:\\文件.rar";try {File outFileDir = new File(rarPath);Archive archive = new Archive(new FileInputStream(rarFile));FileHeader fileHeader;while ((fileHeader = archive.nextFileHeader()) != null) {// 解决文件名中文乱码问题String fileName = fileHeader.getFileNameW().isEmpty() ? fileHeader.getFileNameString() :fileHeader.getFileNameW();String fileExt =fileName.substring(fileName.lastIndexOf(FileConstant.FILE_SEPARATOR) + 1);System.out.println(fileName);ByteArrayOutputStream os = new ByteArrayOutputStream();archive.extractFile(fileHeader, os);// 将文件信息写到byte数组中byte[] bytes = os.toByteArray();System.out.println(bytes.length);if ("rar".equals(fileExt)) {Archive secondArchive = new Archive(new ByteArrayInputStream(bytes));// 循环解压}}} catch (IOException e) {e.printStackTrace();}}
// 获取远程rarpublic void unRarByUrl() {String rarUrl = "https://localhost:80/group1/M00/6D/A3/wKjScWE7PxqAQfUnAAGcIyZy0ZU422.rar";try {URL url = new URL(rarUrl);HttpURLConnection conn = (HttpURLConnection)url.openConnection();int resultCode = conn.getResponseCode();if (200 == resultCode) {InputStream inputStream = conn.getInputStream();Archive archive = new Archive(inputStream);FileHeader fileHeader;while ((fileHeader = archive.nextFileHeader()) != null) {// 解决文件名中文乱码问题String fileName = fileHeader.getFileNameW().isEmpty() ? fileHeader.getFileNameString() :fileHeader.getFileNameW();String fileExt =fileName.substring(fileName.lastIndexOf(FileConstant.FILE_SEPARATOR) + 1);System.out.println(fileName);ByteArrayOutputStream os = new ByteArrayOutputStream();archive.extractFile(fileHeader, os);// 将文件信息写到byte数组中byte[] bytes = os.toByteArray();System.out.println(bytes.length);if ("rar".equals(fileExt)) {Archive secondArchive = new Archive(new ByteArrayInputStream(bytes));// 循环解压}}}} catch (IOException e) {e.printStackTrace();}}
3）注意
rar5的加密算法未开源，目前不支持对rar5的解压，建议压缩时选择rar4
3.7z实现
由于7z的算法等原因，目前只有针对文件的解压，不能直接对流进行操作
<!--apache提供的压缩包依赖--><dependency><groupId>mons</groupId><artifactId>commons-compress</artifactId><version>1.9</version></dependency><!--不引入xz依赖会在new SevenZFile的时候报错java.lang.NoClassDefFoundError: org/tukaani/xz/FilterOptions--><dependency><groupId>org.tukaani</groupId><artifactId>xz</artifactId><version>1.5</version></dependency>
// 解析本地7z文件public void un7zByPath() {File srcFile = new File("C:\\文件.7z");//获取当前压缩文件//开始解压try {SevenZFile zIn = new SevenZFile(srcFile);SevenZArchiveEntry entry = null;File newFile = null;while ((entry = zIn.getNextEntry()) != null) {if (!entry.isDirectory()) {newFile = new File("destDirPath", entry.getName());if (!newFile.exists()) {new File(newFile.getParent()).mkdirs();//创建此文件的上级目录}OutputStream out = new FileOutputStream(newFile);BufferedOutputStream bos = new BufferedOutputStream(out);int len = -1;// 将文件信息写到byte数组中byte[] buf = new byte[(int) entry.getSize()];while ((len = zIn.read(buf)) != -1) {bos.write(buf, 0, len);}System.out.println(entry.getName() + "=" + Arrays.toString(buf));// 关流顺序，先打开的后关闭bos.close();out.close();}}} catch (IOException e) {e.printStackTrace();}}
实在不行可以考虑把远程文件写到磁盘再读成文件，不过这种方法不太靠谱，暂不考虑
四、总结
有关rar5不能解析，以及7z不能直接对流进行操作，后面找到解决方法再写
如果觉得《Java解压压缩包（zip/rar/7z）》对你有帮助，请点赞、收藏，并留下你的观点哦！
