perl使用xml::simple来读写xml

OGeek|极客世界-中国程序员成长平台 › 门户 › 编程› Perl›Perl教程

原作者: [db:作者] 来自: [db:来源] 收藏邀请

一读xml

1）xml实例

<?xml version="1.0" encoding="UTF-8"?>
<employees>
  <employee age = "30">
    <name>linux</name>
    <country>US</country>
  </employee>
  <employee age = "10">
    <name>mac</name>
    <country>US</country>
  </employee>
  <employee age = "20">
    <name>windows</name>
    <country>US</country>
  </employee>
</employees>

2）代码

use File::Basename;
use XML::Simple;
use Data::Dumper;

my $xmlfile = dirname($0) . "\\employees.xml";
if (-e $xmlfile)
{
    print "-----------------------------------------\n";
    my $userxs = XML::Simple->new(KeyAttr => "name");
    my $userxml = $userxs->XMLin($xmlfile);
    # print output
    print Dumper($userxml);

    my %allemployees = %{$userxml->{employee}};
    foreach my $key (keys(%allemployees))
    {
      print $key . " ";
      print $allemployees{$key}{"age"} . "\n";
    }

    print "-----------------------------------------\n";
       my $userxsT = XML::Simple->new(ForceArray => 1);
    my $userxmlT = $userxsT->XMLin($xmlfile);
    # print output
    print Dumper($userxmlT);

    my @allemployeeT = @{$userxmlT->{"employee"}};
    foreach my $employee (@allemployeeT)
    {
      print $employee->{"name"}[0] . " ";
      print $employee->{"age"} . "\n";
    }
}

3）结果

二写xml

代码：

use File::Basename;
use XML::Simple;
use Data::Dumper;

print "-----------------------------------------\n";
# create array
my @arr = [
        {'country'=>'england', 'capital'=>'london'},
        {'country'=>'norway', 'capital'=>'oslo'},
        {'country'=>'india', 'capital'=>'new delhi'} ];

# create object
my $xml = new XML::Simple(NoAttr=>1, RootName=>'dataroot');

# convert Perl array ref into XML document
my $data = $xml->XMLout(\@arr,outputfile => "output1.xml");

print "-----------------------------------------\n";
my $str=<<_XML_STRING_;
<config logdir="/var/log/foo/" debugfile="/tmp/foo.debug">
<server name="sahara" osname="solaris" osversion="2.6">
  <address>10.0.0.101</address>
  <address>10.0.1.101</address>
</server>
<server name="gobi" osname="irix" osversion="6.5">
  <address>10.0.0.102</address>
</server>
<server name="kalahari" osname="linux" osversion="2.0.34">
  <address>10.0.0.103</address>
  <address>10.0.1.103</address>
</server>
</config>
_XML_STRING_

my $xml_ref=XMLin($str,KeepRoot => 1);
my $xml_str=XMLout($xml_ref,outputfile => "output2.xml");
print "-----------------------------------------\n";

三更多

常用参数：

KeyAttr => [ list ] # in+out - important or KeyAttr => { list } # in+out - important 表示读取出来的dict中的key。

ForceArray => 1 # in - important or ForceArray => [ names ] # in - important 表示dict中的子元素表示为array，而不是dict。

NoAttr => 1 # in+out - handy 表示是否将子元素和属性都写为属性，读入时是否忽略属性。

RootName => 'string' # out - handy 表示写xml时的root节点名字。

KeepRoot => 1 # in+out - handy 表示是处理取root节点

xml-simple模块详细参考：http://search.cpan.org/~grantm/XML-Simple-2.18/lib/XML/Simple.pm

完！