[英]Perl LWP::UserAgent parse response JSON
I am using the LWP::UserAgent module to issue a GET request to one of our APIs.我正在使用LWP::UserAgent模块向我们的 API 之一发出 GET 请求。
#!/usr/bin/perl
use strict;
use warning;
use LWP::UserAgent;
use Data::Dumper;
my $ua = LWP::UserAgent->new;
my $request = $ua->get("http://example.com/foo", Authorization => "Bearer abc123", Accept => "application/json" );
print Dumper $request->content;
The request is successful.请求成功。 Dumper returns the following JSON. Dumper 返回以下 JSON。
$VAR1 = '{
"apiVersion": "v1",
"data": {
"ca-bundle.crt": "-----BEGIN CERTIFICATE-----abc123-----END CERTIFICATE-----\\n"
},
"kind": "ConfigMap",
"metadata": {
"creationTimestamp": "2021-07-16T17:13:01Z",
"labels": {
"auth.openshift.io/managed-certificate-type": "ca-bundle"
},
"managedFields": [
{
"apiVersion": "v1",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:data": {
".": {},
"f:ca-bundle.crt": {}
},
"f:metadata": {
"f:labels": {
".": {},
"f:auth.openshift.io/managed-certificate-type": {}
}
}
},
"manager": "cluster-kube-apiserver-operator",
"operation": "Update",
"time": "2021-09-14T17:07:39Z"
}
],
"name": "kube-control-plane-signer-ca",
"namespace": "openshift-kube-apiserver-operator",
"resourceVersion": "65461225",
"selfLink": "/api/v1/namespaces/openshift-kube-apiserver-operator/configmaps/kube-control-plane-signer-ca",
"uid": "f9aea067-1234-5678-9101-9d4073f5ae53"
}
}';
Let's say I want to print the value of the apiVersion key, which should print v1 .假设我想打印 apiVersion 键的值,它应该打印v1 。
print "API Version = $request->content->{'apiVersion'} \n";
The following is being printed.正在打印以下内容。 I am not sure how to print the value v1 .我不确定如何打印值v1 。 Since HTTP::Response is included in the output, I suspect I might have to use the HTTP::Response module ?由于 HTTP::Response 包含在输出中,我怀疑我可能必须使用HTTP::Response 模块?
API Version = HTTP::Response=HASH(0x2dffe80)->content->{'apiVersion'}
Perl doesn't expand subroutine calls in a double-quoted string. Perl 不会在双引号字符串中扩展子例程调用。
print "API Version = $request->content->{'apiVersion'} \\n";
In this line of code, content()
is a subroutine call.在这行代码中, content()
是一个子程序调用。 So Perl sees this as:所以 Perl 认为:
print "API Version = $request" . "->content->{'apiVersion'} \n";
And if you try to print most Perl objects, you'll get the hash reference along with the name of the class - hence HTTP::Response=HASH(0x2dffe80)
.如果您尝试打印大多数 Perl 对象,您将获得散列引用以及类的名称 - 因此HTTP::Response=HASH(0x2dffe80)
。
You might think that you just need to break up your print()
statement like this:你可能认为你只需要像这样分解你的print()
语句:
print 'API Version = ', $request->content->{'apiVersion'}, "\n";
But that's not going to work either.但这也行不通。 $request->content
doesn't return a Perl data structure, it returns a JSON-encoded string. $request->content
不返回 Perl 数据结构,它返回一个 JSON 编码的字符串。 You need to decode it into a data structure before you can access the individual elements.您需要先将其解码为数据结构,然后才能访问各个元素。
use JSON;
print 'API Version = ', decode_json($request->content)->{'apiVersion'}, "\n";
But it might be cleaner to do the decoding outside of the print()
statement.但是在print()
语句之外进行解码可能会更清晰。
use JSON;
my $data = decode_json($request->content);
In which case you can go back to something more like your original code:在这种情况下,您可以返回更像原始代码的内容:
print "API Version = $data->{'apiVersion'} \n";
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.