发布于 2014-10-11 03:26:26 | 491 次阅读 | 评论: 0 | 来源: 网友投递
Apache Commons
Apache Commons项目的由三部分组成：The Commons Proper - 一个可重用的Java组件库。The Commons Sandbox - Java组件开发工作区. The Commons Dormant - 当前处于非活动状态的组件库.
Apache Commons Compress 1.9 发布，此版本现已提供下载，在没有 GZIP 的情况下支持原始压缩流；修复了 7z 和 tar 包相关的 bug；改进了对 Java 库 XZ 的检测。
更新内容如下：
新特性 o Added support for DEFLATE streams without any gzip framing. Issue: COMPRESS-263. Thanks to Matthias Stevens. Bugs 修复 o When reading 7z files unknown file properties and properties of type kDummy are now ignored. Issue: COMPRESS-287. o Expanding 7z archives using LZMA compression could cause an EOFException. Issue: COMPRESS-286. o Long-Name and -link or PAX-header entries in TAR archives always had the current time as last modfication time, creating archives that are different at the byte level each time an archive was built. Issue: COMPRESS-289. Thanks to Bob Robertson. 改进 o Checking for XZ for Java may be expensive. The result will now be cached outside of an OSGi environment. You can use the new XZUtils#setCacheXZAvailability to overrride this default behavior. Issue: COMPRESS-285.
Commons Compress 用以实现将文件压缩或解压成 tar、zip、bzip2 等格式。
下面代码将文件压缩成zip格式：
ArArchiveEntry entry = new ArArchiveEntry(name, size); arOutput.putArchiveEntry(entry); arOutput.write(contentOfEntry); arOutput.closeArchiveEntry();
Zip文件的解压缩：
ArArchiveEntry entry = (ArArchiveEntry) arInput.getNextEntry();
byte[] content = new byte[entry.getSize()];
LOOP UNTIL entry.getSize() HAS BEEN READ {
arInput.read(content, offset, content.length - offset);
}