使用perl XML :: LibXML来如此缓慢地处理XML
发布时间:2020-12-15 23:24:02 所属栏目:大数据 来源:网络整理
导读:XML文件是这样的: ?xml version="1.0" encoding="UTF-8"?resource-data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="resource-data.xsd" class name="AP" attributes resourceId00 11 B5 1B 6D 20/resourceId l
XML文件是这样的:
<?xml version="1.0" encoding="UTF-8"?> <resource-data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="resource-data.xsd"> <class name="AP"> <attributes> <resourceId>00 11 B5 1B 6D 20</resourceId> <lastModifyTime>20130107091545</lastModifyTime> <dcTime>20130107093019</dcTime> <attribute name="NMS_ID" value="DNMS" /> <attribute name="IP_ADDR" value="10.11.141.111" /> <attribute name="LABEL_DEV" value="00 11 B5 1B 6D 20" /> </attributes> <attributes> <resourceId>00 11 B5 1B 6D 21</resourceId> <lastModifyTime>20130107091546</lastModifyTime> <dcTime>20130107093019</dcTime> <attribute name="NMS_ID" value="DNMS" /> <attribute name="IP_ADDR" value="10.11.141.112" /> <attribute name="LABEL_DEV" value="00 11 B5 1B 6D 21" /> </attributes> </class> </resource-data> 我的代码: #!/usr/bin/perl use Encode; use XML::LibXML; use Data::Dumper; $parser = new XML::LibXML; $struct = $parser->parse_file("d:/AP_201301073100_1.xml"); my $file_data = "d:ap.txt"; open IN,">$file_data"; $rootel = $struct->getDocumentElement(); $elname = $rootel->getName(); @kids = $rootel->getElementsByTagName('attributes'); foreach $child (@kids) { @atts = $child->getElementsByTagName('attribute'); foreach $at (@atts) { $va = $at->getAttribute('value'); print IN encode("gbk","$vat"); } print IN encode("gbk","n"); } close(IN); 我的问题是,如果XML文件只有80MB,那么程序将非常快,但是当XML文件大得多时,程序可能会非常慢.有人可以帮助我加快速度吗? 解决方法
另一种可能性是使用
XML::LibXML::Reader.它与SAX类似,但使用与XML :: LibXML相同的libxml库:
#!/usr/bin/perl use warnings; use strict; use XML::LibXML::Reader; my $reader = XML::LibXML::Reader->new(location => '1.xml'); open my $OUT,'>:encoding(gbk)','1.out'; while ($reader->read) { attr($reader) if 'attributes' eq $reader->name and XML_READER_TYPE_ELEMENT == $reader->nodeType; } sub attr { my $reader = shift; my @kids; ATTRIBUTE: while ($reader->read) { my $name = $reader->name; last ATTRIBUTE if 'attributes' eq $name; next ATTRIBUTE if XML_READER_TYPE_END_ELEMENT == $reader->nodeType; push @kids,$reader->getAttribute('value') if 'attribute' eq $name; } print {$OUT} join("t",@kids),"n"; } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |