LWP::Simple 模块

LWP::Simple(3)        User Contributed Perl Documentation       LWP::Simple(3)

NAME
       LWP::Simple - simple procedural interface to LWP

SYNOPSIS
        perl -MLWP::Simple -e 'getprint "http://www.sn.no"'

        use LWP::Simple;
        $content = get("http://www.sn.no/");
        die "Couldn't get it!" unless defined $content;

        if (mirror("http://www.sn.no/", "foo") == RC_NOT_MODIFIED) {
            ...
        }

        if (is_success(getprint("http://www.sn.no/"))) {
            ...
        }

DESCRIPTION
       This module is meant for people who want a simplified view of the libwww-perl library.  It should also be suitable for one-liners. 

 If you need more control or access to the header fields in the requests sent and
       responses received, then you should use the full object-oriented interface provided by the "LWP::UserAgent" module.


描述:
     这个模块是为那些想要 简单的查看 lib www-perl library，它也应该是适合一个衬垫。  如果你需要更多的控制或者访问 请求发送的header 
fields  和收到的响应,你需要使用完整的面向对象接口  “LWP:：UserAgent”模块。

       The following functions are provided (and exported) by this module:

     本模块提供以下功能（和导出）：

       get($url)
          The get() function will fetch the document identified by the given URL and return it.  It returns "undef" if it fails.  The 

$url argument can be either a simple string or a reference to a URI object.

          You will not be able to examine the response code or response headers (like ’Content-Type’) when you are accessing the web 

using this function.  If you need that information you should use the full OO
          interface (see LWP::UserAgent).

 get($url)
    get() 方法 将读取文件的URL 并将其返回, 它返回为"undef" 如果失败的话, $URL参数可以使一个简单的字符串或者是一个URL对象的引用。

    
       当你访问网站时, 你将无法检查响应代码或响应头（如"内容类型")使用该函数,如果你需要这个信息,你应该使用面向对象接口 LWP::UserAgent

       head($url)
          Get document headers. Returns the following 5 values if successful: ($content_type, $document_length, $modified_time, $expires, 

$server)

          Returns an empty list if it fails.  In scalar context returns TRUE if successful.

        获取文件 header，返回下面的5个值如果成功的话:($content_type, $document_length, $modified_time, $expires, $server)

         获取返回的header 信息


          返回一个空的列表 如果失败的话

       getprint($url)
          Get and print a document identified by a URL. The document is printed to the selected default filehandle for output (normally 

STDOUT) as data is received from the network.  If the request fails, then the
          status code and message are printed on STDERR.  The return value is the HTTP response code.

GET和print  通过一个URL 识别文档,文档打印到文件句柄,如果请求失败,然后状态码和消息都打印在stderr上


       getstore($url, $file)
          Gets a document identified by a URL and stores it in the file. The return value is the HTTP response code.

       mirror($url, $file)
          Get and store a document identified by a URL, using If-modified-since, and checking the Content-Length.  Returns the HTTP 

response code.

       This module also exports the HTTP::Status constants and procedures.  You can use them when you check the response code from 

getprint(), getstore() or mirror().  The constants are:

          RC_CONTINUE
          RC_SWITCHING_PROTOCOLS
          RC_OK
          RC_CREATED
          RC_ACCEPTED
          RC_NON_AUTHORITATIVE_INFORMATION
          RC_NO_CONTENT
          RC_RESET_CONTENT
          RC_PARTIAL_CONTENT
          RC_MULTIPLE_CHOICES
          RC_MOVED_PERMANENTLY
          RC_MOVED_TEMPORARILY
          RC_SEE_OTHER
          RC_NOT_MODIFIED
          RC_USE_PROXY
          RC_BAD_REQUEST
          RC_UNAUTHORIZED
          RC_PAYMENT_REQUIRED
          RC_FORBIDDEN
          RC_NOT_FOUND
          RC_METHOD_NOT_ALLOWED
          RC_NOT_ACCEPTABLE
          RC_PROXY_AUTHENTICATION_REQUIRED
          RC_REQUEST_TIMEOUT
          RC_CONFLICT
          RC_GONE
          RC_LENGTH_REQUIRED
          RC_PRECONDITION_FAILED
          RC_REQUEST_ENTITY_TOO_LARGE
          RC_REQUEST_URI_TOO_LARGE
          RC_UNSUPPORTED_MEDIA_TYPE
          RC_INTERNAL_SERVER_ERROR
          RC_NOT_IMPLEMENTED
          RC_BAD_GATEWAY
          RC_SERVICE_UNAVAILABLE
          RC_GATEWAY_TIMEOUT
          RC_HTTP_VERSION_NOT_SUPPORTED

       The HTTP::Status classification functions are:

       is_success($rc)
          True if response code indicated a successful request.

       is_error($rc)
          True if response code indicated that an error occurred.

       The module will also export the LWP::UserAgent object as $ua if you ask for it explicitly.

       The user agent created by this module will identify itself as "LWP::Simple/#.##" and will initialize its proxy defaults from the 

environment (by calling $ua->env_proxy).

CAVEAT
       Note that if you are using both LWP::Simple and the very popular CGI.pm module, you may be importing a "head" function from each 

module, producing a warning like "Prototype mismatch: sub main::head ($) vs none".
       Get around this problem by just not importing LWP::Simple’s "head" function, like so:

               use LWP::Simple qw(!head);
               use CGI qw(:standard);  # then only CGI.pm defines a head()

       Then if you do need LWP::Simple’s "head" function, you can just call it as "LWP::Simple::head($url)".

SEE ALSO
       LWP, lwpcook, LWP::UserAgent, HTTP::Status, lwp-request, lwp-mirror

perl v5.10.1                      2009-06-16                    LWP::Simple(3)
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