从jar获取已打包文件（具体参考hibernate3的源代码）

1.创建jar对象
java.util.jar.JarFile jarFile；
java.io.File jar；

2.获取对象
try {
jarFile = new JarFile( jar );
}
catch ( IOException ioe ) {
log.error( "Could not configure datastore from jar: " + jar.getName(), ioe );
throw new MappingException( "Could not configure datastore from jar: " + jar.getName(), ioe );
}

3.获取jar对象内的压缩文件对象
Enumeration jarEntries = jarFile.entries();

4.使用对象
while ( jarEntries.hasMoreElements() ) {
ZipEntry ze = ( ZipEntry ) jarEntries.nextElement();
if ( ze.getName().endsWith( ".hbm.xml" ) ) {
log.info( "Found mapping documents in jar: " + ze.getName() );
try {
addInputStream( jarFile.getInputStream( ze ) ); // 重点－使用对象
}
catch ( MappingException me ) {
throw me;
}
catch ( Exception e ) {
log.error( "Could not configure datastore from jar: " + jar.getName(), e );
throw new MappingException( "Could not configure datastore from jar: " + jar.getName(), e );
}
}
}