我有一个json结构,我正在解码,看起来像这样：
person => {
city => "Chicago",id => 123,name => "Joe Smith",pets => {
cats => [
{ age => 6,name => "cat1",type => "siamese",weight => "10 kilos" },{ age => 10,name => "cat2",weight => "13 kilos" },],dogs => [
{ age => 7,name => "dog1",weight => "20 kilos" },{ age => 5,name => "dog2",weight => "15 kilos" },},}
我可以通过以下方式打印城市,id,名称：
foreach my $listing ($decoded->{person})
{
my $city = $listing->{city};
my $name = $listing->{name};
name - $city - \n";
}
但是,我不确定如何打印宠物 – >猫或宠物 – >狗.我可以通过以下方式转储它们：
my @pets = $listing->{pets}->{cats};
dump @pets;
但我不确定如何通过哈希结构访问它们.
解决方法
假设您的$listing是一个人,您必须取消引用数组和散列引用.
# as long as we are assuming $listing is a person
# this goes inside the foreach you posted in your
# question.
# this will print all cats' names
foreach my $cat ( @{ $listing->{pets}->{cats} } )
{
# here $cat is a hash reference
say $cat->{name}; # cat's name
}
等等其他东西.
要从结构中访问它们,您可以执行以下操作：
say $listing->{pets}->{cats}->[0]->{name}; # this will print 'cat1'