Java中的ZIP标准
这样一篇入门级文章,实在没有多大技术含量,只是碰巧刚才有人问我如何读EAR或者WAR中的某个资源文件,最简单的方式以资源方式读取,另外一种则可以采用Zip API去读,实际上J2EE中我们接触到的全部部署文件都是遵循ZIP压缩标准的。明白这一点,我们就不用关注他的文件扩展名到底是什么,都可以方便的用WinZip或者WinRAR去查看其压缩包的内容。同时我们在部署一些应用时,如果我们熟悉了EAR、WAR的结构规则,我们也可以直接按照其目录结构规则用WinZip或者WinRAR组织发布的压缩文件,而不用ANT(哈哈,不是推荐替换ANT,只是让初学者可以多一条路径来理解这个过程)。下面我给出这两种方式的实现。
第一种方式,通过classloader,将zip格式中的文件当做资源来处理,提供读取每个资源的InputStream,得到这个InputStream对象我们就可以象操作普通文件一样的操作了。
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第二种方式,我们使用java.util.zip包提供的api进行文件操作,这个例子给出了简单的ZipEntry列表及读取功能。
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最后补充下,内容如何写入,下例是写入一个文本文件
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更新包中某一个文件,下面更新一个文本文件
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