IO Foundation 6-解压缩zip文件-阿里云开发者社区

IO Foundation 6-解压缩zip文件

2017-11-15 950

版权

本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。

简介：

需求：

这一步也非常简单，主要是demo下ZipEntry的用法，就是把一个以zip扩展名结尾的文件进行解压缩。

所以我就直接贴上代码了：

实现：

/**
* This class will handle the folder zipper related operations
*
* @author cwang58
* @created date: Aug 4, 2012
*/
public class FolderZipper implements IFolderZipper {
private static Logger logger = LoggerFactory.getLogger(FolderZipper.class);
/**
* to unzip a zip file ,it will read all the entries in the zip file if the
* entry is a folder ,then it will created a folder structure (including the
* parent folder structure) if the entry is a file ,then it use file output
* stream to output this file
*
* @param zipFileName
* the zip file name
* @param destPath
* the path that we want to zip to
*/
public void unzip(String zipFileName, String destPath) throws Exception {
// verify the parameters
if (zipFileName == null || zipFileName.trim().equals(EMPTY_STRING)) {
if (logger.isErrorEnabled()) {
logger.error("zipFileName parameter can't be null");
}
throw new ParameterNullException(ZIP_UNZIP_ERROR);
}
if (destPath == null) {
if (logger.isErrorEnabled()) {
logger.error("destPath parameter can't be null");
}
throw new ParameterNullException("ZIP_UNZIP_ERROR");
}
// verify the zip file 's file extension (only support ZIP)
if (!zipFileName.trim().endsWith(ZIP_EXTENSION)) {
if (logger.isErrorEnabled()) {
logger.error("the zip file MUST BE end with zip suffix");
}
throw new ParameterInvalidException(ZIP_UNZIP_ERROR);
}
try {
FileInputStream fis = new FileInputStream(zipFileName);
ZipInputStream zis = new ZipInputStream(fis);
ZipEntry ze = null;
if (destPath.equals(DOT))
destPath = EMPTY_STRING;
while ((ze = zis.getNextEntry()) != null) {
// if the zipEntry is a folder
// then must create the folder structure
if (ze.isDirectory()) {
if (logger.isDebugEnabled()) {
logger.debug("Processing folder:" + ze.getName());
}
// construct the dirName by string concating the destpath
// and the foldername
String dirName = destPath + ze.getName();
// creating the folder structure
File f = new File(dirName);
f.mkdirs();
if (logger.isDebugEnabled()) {
logger.debug("The folder " + f.getAbsolutePath()
+ " is created");
}
}
// if the zipEntry file is a file
// then use a FileOutputStream to write this file
else {
if (logger.isDebugEnabled()) {
logger.debug("Processing file: " + ze.getName());
}
// construct the fileName by string concating the destpath
// and the foldername
String fileName = destPath + ze.getName();
File f = new File(fileName);
// open a FileOutputStream to write this file
FileOutputStream fos = new FileOutputStream(f);
int tmp = -1;
while ((tmp = zis.read()) != -1) {
fos.write(tmp);
}
zis.closeEntry();
fos.close();
if (logger.isDebugEnabled()) {
logger.debug("The file " + f.getAbsolutePath()
+ " is created");
}
}
}
zis.close();
} catch (FileNotFoundException ex) {
if (logger.isErrorEnabled()) {
logger.error("file not found");
}
throw new InvalidFolderZipperException(ZIP_UNZIP_ERROR, ex);
} catch (IOException ex) {
if (logger.isErrorEnabled()) {
logger.error("io exception occured");
}
throw new InvalidFolderZipperException(ZIP_UNZIP_ERROR,
ex);
}
}
}

(1)在47-93行还是对入参进行严格的检查。

(2)第103行打开了一个ZipInputStream，然后在第115行对于这个zip文件里的所有的条目进行遍历。

(3)第119-159行对于条目是一个目录的情况进行了处理，它必须去相应的创建目录结构

(4)第163-215行对于条目是个文件的情况进行了处理，它打开一个文件输出流然后写这个Zip的文件条目到目标目录下相应的位置。

本文转自 charles_wang888 51CTO博客，原文链接：http://blog.51cto.com/supercharles888/980320，如需转载请自行联系原作者

IO Foundation 6-解压缩zip文件

热门文章

最新文章

相关电子书