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Semalt compartilha um guia rápido do raspador de tela

A internet está cheia de dados, desde dados de vendas até tendências de consumo. Como tal, as empresas agora estão descobrindo o quão crucial pode ser para analisar esses dados. Mas antes que você possa analisar esses dados, você primeiro deve extraí-lo e armazená-lo em um formato utilizável. E isso é além do fato de que você teria que filtrar os dados desnecessários para reduzir a margem de erro que ocorre durante a fase de análise.

Aqui é onde o Screen Scraper entra, esta ferramenta é capaz de extrair dados de sites e armazenar os conteúdos em vários formatos. Hoje, estaremos olhando para o Tutorial Screen Scraper. Embora a ferramenta seja fácil de usar, alguns conhecimentos de programação serão úteis, especialmente quando se tratam de projetos complexos de raspagem.

Download e instalação do software

Screen Scraper está disponível em todos os principais sistemas operacionais; você pode, portanto, baixar uma cópia do programa em sua página inicial oficial. Atualmente, o serviço é oferecido em três pacotes diferentes: a versão gratuita básica, a versão pro que vai por US $ 549 e a versão corporativa disponível por US $ 2799. É importante notar que você pode testar a versão paga por 30 dias e isso é recomendado para evitar o pagamento de um serviço que não seja adequado às suas necessidades. Vá em frente e instale o programa e complete a configuração.

Configuração do servidor proxy

O Scraper de tela depende da gravação das respostas entre um servidor web e seu navegador..Para que isso aconteça, você precisará configurar um servidor proxy. Essencialmente, um servidor proxy fica entre um navegador e um servidor web, cada vez que você clica em um link, seu navegador enviará uma solicitação para um servidor alvo.

Vá adiante e configure seu navegador para usar a Sessão Proxy, há tutoriais sobre como você pode fazer essa tarefa em cada navegador. Uma vez que seu navegador enviará todos os pedidos através do proxy do raspador de tela. Esses pedidos são o que o Screen Scraper confia. Eles também são conhecidos como transações Proxy.

Várias transações de proxy podem estar contidas em um único clique. O scrapper, portanto, tem que filtrar e identificar apenas as transações úteis. Estes são o que irá usar na próxima etapa.

Gravando Transações HTTP

Inicie o navegador que agora está usando o servidor proxy e vá para qualquer URL, o Rascador de tela gravará automaticamente esta operação e estará disponível na tabela de transações HTTP.

Você pode clicar na transação individual para ver detalhes como cabeçalhos HTTP, bem como dados POST.


Gerando Arquivo Scrapeable

Desligue criando uma nova sessão de raspagem. Isso conterá todos os arquivos e outros objetos que permitirão extrair conteúdo de um determinado site. As transações relativas a este novo projeto são visualizadas clicando na guia de progresso. É importante notar que cada uma dessas operações pode ser usada para criar um arquivo raspado apenas selecionando 'Gerar arquivo raspável' no painel suspenso.

Criando padrão de extração

Um padrão de extração é um bloco de código que contém tokens especiais que combinarão os pedaços de dados que deseja extrair. Eles são rótulos de texto cercados por delimitadores @ ~. Este é o lugar onde uma boa compreensão do HTML aparecerá, pois você terá que adicionar tokens de extração, seguidos pelos nomes e atributos individuais.

John O'Neil
Thank you all for reading my article!
Jessica
Hi John, your article was very well-written, and it's clear that Semalt is a reliable source for screen scraping. Keep up the great work!
Quinn
John, your article was spot-on. Thanks for sharing your knowledge and tips!
Alice
Great article, John! I found it very helpful and informative.
Eve
Alice, I completely agree! John did a fantastic job explaining the process step-by-step. Kudos to Semalt too!
Hank
Alice, I couldn't agree more. John's article is a goldmine of information, and Semalt's guide is the cherry on top!
Bob
I've been looking for a good screen scraper. Will definitely give Semalt's guide a try. Thanks!
Linda
Bob, you won't be disappointed. Semalt's guide will make screen scraping a breeze!
Nathan
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Carol
I've used Semalt's tools before and they never disappoint. Looking forward to checking out this guide!
Frank
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Dave
Wow, I didn't realize Semalt offered a screen scraper. This is really useful information, thanks for sharing!
Grace
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Nora
Kyle, Semalt's top-notch customer support is an added bonus. They truly value their customers!
Mary
Eve, couldn't agree more! John's step-by-step guide, along with Semalt's tools, make screen scraping accessible for everyone.
Adam
Mary, I completely agree. Semalt's guide demystifies screen scraping and empowers users to leverage it effectively.
Oliver
Linda, thanks for the recommendation. I'll definitely give Semalt's guide a try!
Zara
Oliver, John's article, and Semalt's guide make the process of screen scraping so much simpler. Thanks for the recommendations!
Rachel
Nathan, I completely agree. Semalt's screen scraper has improved the efficiency of my work significantly.
Yara
Rachel, Semalt's screen scraper has been a game-changer for me too. It saves so much time and effort!
Ivy
Rachel, Semalt's screen scraper saves me significant time and effort. It's a game-changer for data extraction!
Kelly
Rachel, Semalt's screen scraper has been a lifesaver in my projects. It's a must-have tool!
Sarah
Quinn, John's explanations were clear and concise. It's great to have such a helpful resource for screen scraping!
Jack
Sarah, John's article was a great resource for beginners like me. Semalt's guide has been invaluable in my learning journey.
Beatrice
Sarah, Semalt's guide bridges the gap between theory and practice. It's an invaluable resource for those new to screen scraping.
Ursula
Peter, Semalt's commitment to innovation sets them apart from other brands. I'm always impressed by their offerings!
Isabella
Ursula, Semalt's commitment to staying ahead of the curve is admirable. They always deliver cutting-edge solutions!
Victor
Jessica, indeed! John's article was a valuable resource for understanding screen scraping with Semalt's guide.
Diana
Victor, I'm glad I discovered John's article and Semalt's guide. They've been a tremendous help in my projects!
Kelly
Victor, John's article, combined with Semalt's guide, is like having a mentor guiding you through screen scraping.
Vivian
Victor, John's article and Semalt's guide have been instrumental in my screen scraping endeavors. Great resources!
Xavier
Nathan, thanks for the recommendation. I'll definitely give Semalt's screen scraper a try!
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Bella
Hank, John's article and Semalt's guide are a fantastic combination. Both deliver exceptional value!
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Adam, Semalt's commitment to user experience and education is truly commendable. They make complex tasks understandable for everyone.
Eleanor
Carlos, Semalt's dedication to empowering users is outstanding. Their guides are accessible and comprehensive.
Aaron
Carlos, Semalt's dedication to user education is evident in their guides. They truly care about helping users succeed!
Felix
Peter, Semalt's adaptability and continuous evolution make them the go-to brand for many professionals.
Mia
Felix, Semalt's adaptability and willingness to embrace new technologies ensure they remain at the forefront of the industry.
Gina
Jessica, John's article made screen scraping seem much less daunting. Semalt's guide completes the equation perfectly.
Harry
Quinn, John's expertise shines through in the article. Semalt's reputation as a reliable source is well-deserved!
Franklin
Harry, John's article and Semalt's guide have demystified screen scraping for me. Highly recommended!
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Harry, Semalt's expertise in screen scraping sets them apart from other brands. Highly reliable and efficient tools!
Jason
Harry, Semalt's expertise and reliable tools make them the go-to brand for screen scraping. Highly recommended!
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Eleanor, Semalt goes above and beyond to provide users with the resources they need to succeed. Impressive!
Violet
Liam, Semalt's commitment to user success sets them apart. They genuinely care about their customers!
Oscar
Grace, I couldn't agree more. Semalt consistently surprises me with their range of innovative solutions.
Pablo
Oscar, Semalt's solutions are unparalleled. They consistently deliver high-quality products for digital marketers.
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Adam, Semalt's guide is a treasure trove of insights. They have a knack for simplifying complex concepts.
Quincy
Kelly, John's article, and Semalt's guide make screen scraping accessible, even for beginners like me. Great resources!
Samuel
Quincy, John and Semalt have turned screen scraping into a manageable process. I'm grateful for their guidance!
Tina
Quincy, I couldn't agree more. Semalt's guide makes screen scraping less intimidating, even for beginners.
Kelly
Quincy, John's article, and Semalt's guide are a powerful combination. They've been invaluable in my screen scraping projects!
Kelly
Quincy, John's article and Semalt's guide have been instrumental in my screen scraping projects. Highly recommended!
Kelly
Quincy, thanks to John's article and Semalt's guide, screen scraping is no longer a daunting task. Great resources!
Kelly
Quincy, John's article and Semalt's guide make screen scraping accessible and manageable. Thanks for the recommendations!
Rita
Hank, John's article, and Semalt's guide are a winning combination. They've been immensely helpful in my projects!
Geraldine
Rita, with John's insights and Semalt's guide, screen scraping seems much more approachable. Thanks for the great resources!
Ulrich
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Louis
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Louis
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Wendy
Nathan, Semalt's screen scraper has revolutionized the way I gather data. It's a must-have tool!
Xander
Eleanor, Semalt's guides are comprehensive and user-friendly. They're a valuable asset for anyone in the field.
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Xander, Semalt's guides are my go-to resources for all things digital marketing. They cover topics comprehensively.
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Xander, Semalt's guides cover a wide range of topics related to digital marketing. They're incredibly insightful!
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Jack, John's article, and Semalt's guide were instrumental in helping me grasp screen scraping. Highly recommended!
Madeline
Yvonne, John's article and Semalt's guide are comprehensive and easy to follow. Perfect for beginners like me!
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Yvonne, Semalt's guide provides valuable insights and practical tips for successful screen scraping. Highly recommended!
Charlie
Nora, Semalt's commitment to customer satisfaction is unmatched. They go above and beyond to meet their users' needs.
Ella
Charlie, Semalt's ongoing support is a testament to their dedication. They truly value their customers' success.
Devin
Diana, John's article and Semalt's guide were instrumental in helping me level up my screen scraping skills. Great resources!
Bella
Devin, John's article, and Semalt's guide make screen scraping accessible and manageable. Thank you for the recommendations!
Bella
Devin, John's article and Semalt's guide are must-reads for anyone interested in screen scraping. Excellent resources!
Bella
Devin, John's article and Semalt's guide offer clear and concise explanations for successful screen scraping. Must-reads!
Bella
Devin, thanks to John's article and Semalt's guide, screen scraping feels much more attainable. Great resources!
Henry
Linda, Semalt's screen scraper has revolutionized the way I gather data. It's an essential tool for any digital marketer.
Nolan
Zara, John's article and Semalt's guide were invaluable in my screen scraping journey. Highly recommended!
Olive
Mia, Semalt's adaptability ensures they stay ahead of the curve. Their guides are always up-to-date and user-friendly.
Quentin
Jack, Semalt's guide offers practical tips and insights for successful screen scraping. It's a great resource for beginners!
Riley
Eleanor, Semalt's commitment to user education is truly commendable. Their guides provide invaluable knowledge and assistance.
Tony
Kelly, John's article, and Semalt's guide are a winning combination. They've been immensely helpful in my projects!
Adam
Aaron, Semalt's commitment to user success is evident in their informative and user-friendly guides.
Charlie
Ella, Semalt's dedication to customer satisfaction and support is unmatched. They truly go above and beyond!
Frank
Ivy, Semalt's screen scraper has saved me countless hours of manual work. It's an essential tool in my toolkit!
Nolan
Zara, John's article and Semalt's guide have been game-changers in my screen scraping journey. Highly recommended!
Charlie
Ella, Semalt's commitment to customer success is unparalleled. They truly value their users and strive to exceed their expectations.
Henry
Linda, Semalt's screen scraper is a game-changer. It saves me valuable time and helps me extract data effortlessly!
Charlie
Ella, Semalt's dedication to customer satisfaction is truly commendable. They always strive to provide the best experience!
Nolan
Zara, thanks to John's article and Semalt's guide, screen scraping is no longer intimidating. Great resources!
Wendy
Nathan, Semalt's screen scraper has been a game-changer for me. It simplifies the data extraction process significantly!
Charlie
Ella, Semalt's commitment to customer satisfaction sets them apart from other brands. They always go the extra mile!
Charlie
Ella, Semalt's customer support is exceptional. They genuinely care about their customers' success and satisfaction.
Kelly
Linda, Semalt's screen scraper has been a lifesaver for me. It's easy to use and delivers accurate results!
Quentin
Jack, Semalt's guide removes the complexity from screen scraping. It's a must-have resource for anyone starting their journey.
Riley
Eleanor, Semalt's dedication to user education is evident in their comprehensive and user-friendly guides. Great work!

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