Perl LWP中的Cookie [英] Cookies in perl lwp

问题描述

我曾经写过一个简单的抓取工具"，用JAVA为我下载http页面. 现在，我正在尝试使用LWP模块将相同的内容重写为Perl.

I once wrote a simple 'crawler' to download http pages for me in JAVA. Now I'm trying to rewrite to same thing to Perl, using LWP module.

这是我的Java代码(效果很好):

This is my Java code (which works fine):

String referer = "http://example.com";
String url = "http://example.com/something/cgi-bin/something.cgi";
String params= "a=0&b=1";

HttpState initialState = new HttpState(); HttpClient httpclient = new HttpClient(); httpclient.setState(initialState); httpclient.getParams().setCookiePolicy(CookiePolicy.NETSCAPE);

HttpState initialState = new HttpState(); HttpClient httpclient = new HttpClient(); httpclient.setState(initialState); httpclient.getParams().setCookiePolicy(CookiePolicy.NETSCAPE);

PostMethod postMethod = new PostMethod(url); postMethod.addRequestHeader("Referer", referer); postMethod.addRequestHeader("User-Agent", " Mozilla/5.0 (Windows; U; Windows NT 6.1; pl; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"); postMethod.addRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8"); postMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded");

PostMethod postMethod = new PostMethod(url); postMethod.addRequestHeader("Referer", referer); postMethod.addRequestHeader("User-Agent", " Mozilla/5.0 (Windows; U; Windows NT 6.1; pl; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"); postMethod.addRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8"); postMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded");

String length = String.valueOf(params.length()); postMethod.addRequestHeader("Content-Length", length); postMethod.setRequestBody(params);

String length = String.valueOf(params.length()); postMethod.addRequestHeader("Content-Length", length); postMethod.setRequestBody(params);

httpclient.executeMethod(postMethod);

httpclient.executeMethod(postMethod);

这是Perl版本:

my $referer = "http://example.com/something/cgi-bin/something.cgi?module=A";
my $url = "http://example.com/something/cgi-bin/something.cgi";
my @headers = (
  'User-Agent' => 'Mozilla/5.0 (Windows; U; Windows NT 6.1; pl; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13',
  'Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'Referer' => $referer,
  'Content-Type' => 'application/x-www-form-urlencoded',
);

my @params = (
    'a' => '0',
    'b' => '1',
);

my $browser = LWP::UserAgent->new( );
$browser->cookie_jar({});

$response = $browser->post($url, @params, @headers);
print $response->content;

发布请求正确执行，但是我得到了另一个(主)网页.好像cookie不能正常工作...

The post request executes correctly, but I get another (main) webpage. As if cookies were not working properly...

有人猜错了吗? 为什么我从JAVA和perl程序中得到不同的结果?

Any guesses what is wrong? Why I'm getting different result from JAVA and perl programs?

推荐答案

您要创建哈希，而不是数组-例如，代替:

You want to be creating hashes, not arrays - e.g. instead of:

my @params = ( 'a' => '0', 'b' => '1', );

my @params = ( 'a' => '0', 'b' => '1', );

您应该使用:

my %params = ( a => 0, b => 1, );

my %params = ( a => 0, b => 1, );

将参数传递给LWP :: UserAgent post方法时，您需要传递对哈希的引用，例如:

When passing the params to the LWP::UserAgent post method, you need to pass a reference to the hash, e.g.:

$response = $browser->post($url, \%params, %headers);

$response = $browser->post($url, \%params, %headers);

您还可以使用以下方法查看要发送到服务器的请求:

You could also look at the request you're sending to the server with:

print $response->request->as_string;

print $response->request->as_string;

您还可以使用处理程序自动转储请求和响应以进行调试:

You can also use a handler to automatically dump requests and responses for debugging purposes:

$ua->add_handler("request_send", sub { shift->dump; return }); $ua->add_handler("response_done", sub { shift->dump; return });

$ua->add_handler("request_send", sub { shift->dump; return }); $ua->add_handler("response_done", sub { shift->dump; return });

这篇关于Perl LWP中的Cookie的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！