java web crawler tutorial

DescriptionIntelliJ idea version is 14.JDK version is 1.7Tomcat version is apache-tomcat-7.0.70 Note: Note the issue of the number of related software version bits during the creation process. 32-bit, 64-bit software mash-up can lead to unsuccessful access problems!!! The first thing to understand is a basic question: In contrast to eclipse, "new Project" in IntelliJ idea is equivalent to the workspace in Eclipse (Workspace), and the "New Module" Equivalent to Engineering (pr

During some projects that require web page capturing, garbled code is frequently encountered. The most convenient way is to go to the website to be crawled to see what encoding is, and then use the correct encoding for decoding. However, it is not always a matter of page-by-page judgment, especially when you need to capture a large number of pages on different sites, such as web

long time, directly to the user to cause the poor experience. Solving this problem simply using AJAX lazy loading does not solve the problem. It is recommended to use a web crawler, the first page and other main pages to generate static pages regularly. The HTTP server will be the static page in the system proxy, the user does not need to request the application server can directly access the homepage, and

One: Java's NIO channelJava NiO channels are similar to streams, but are somewhat different:The ==> can read data from the channel and write data to the channel. But stream reads and writes are usually one-way.==> channels can be read and written asynchronously.The data in the ==> channel is always read to a buffer first, or it is always written from a buffer.As mentioned above, the data is read from the channel to the buffer, and the data is written from the buffer to the channel. As shown in t

users, as well as an interface for storing data on the back end. This tutorial focuses on writing Java code that uses an XML parser to manipulate XML documents. As shown in the image below, this tutorial focuses on the middle piece. Chapter II Foundation of the parser Basis An XML parser is a piece of code that can be read into a document and analyze i

When crawling the content of a single Web site, regular matching is usually used, but the structure of different sites is strange and difficult to match with a uniform regular expression. The author of the general Web page body extraction algorithm based on the block distribution function summarizes the method of extracting the body of the article from the Web pa

seen a beautiful Garfield. Click the Tomcat Manager link on the left to prompt for your user name and password, this article is Coresun, and you can see the following pages:In context Path (option): Enter/petIn the XML configration file URL, you specify an. xml document, for example, we create a pet.xml file under F:\, with the following content:In the war or Directory URL: type F:\PetWet or F:\Pet.war, then click the Deploy button to see if you have seen your

Java Call Phantomjs Collection Ajax loading generated Web page a few days ago, when I put all the corresponding pages of the link to the hand, ready to start according to the link to collect (write crawler crawl) corresponding to the terminal page, found that the data obtained by the program has no corresponding content, But my browser see the content is clearly

Implementation ideas: 1. Use a java.net. url object to bind a webpage address on the network 2. Obtain an httpconnection object through the openconnection () method of the java.net. url object. 3. Use the getinputstream () method of the httpconnection object to obtain the input stream object inputstream of the network file. 4. read each row of data in the stream cyclically, and use the regular expression compiled by the pattern object to partition each row of characters to obtain the ema

Questions about how to put the Java Web online and deploy it to a public network so that people all over the world can access it. Small series will be made serialization, complete process introduction. 1. In myeclipse to develop a good project, packaged into the war format, the students will not refer to the following Http://zhidao.baidu.com/link?url=Gb0OV9pHiDtJr8nyjPrnSA65g49I4TEAn2N3pwXsxzVsCaX0gJ8RQZHQ2

configuration below.Second, the project configuration.1. Add Source FolderMAVEN requires that you create the following source FolderSrc/main/resourcesSrc/main/javaSrc/test/resourcesSrc/test/javaAdd the above source FolderThe effect after adding:2. Configure the Build Path to set the libraries. Configure the dependent JDK.The effect after configuration is complete:After downloading the dependencies, the effect is as follows:3. Configure the path.Modify the output path individually:Src/main/resou

Web projects. Database-related knowledge, first of all, we need to understand database-related theories. We recommend that you read the database system concepts book to understand key concepts. Then, we will mainly learn SQL statements. You can follow the Tutorial at w3school, you can master either of the two databases. The database is connected to JDBC. The native JDBC Statement must be compiled. The pers

asp.net| Tutorial Personalization is now a key part of most Web applications. TechRepublic and Amazon are typical examples of the ability to remember certain features of a user. Applying ASP.net 1.x to implement this functionality requires some extra work and a session object to be used, but the 2.0 version simplifies the personalization process. 　　Personality files The ASP.net 2.0 Profile system allows you

Profile1. SSH development related software and development package download2. Software Installation and related settings3. The simplest web program1. Software downloadBuild a directory Javatools in D to store downloaded software and development packages. (This tutorial will use the D drive, you can also use the C or E drive). Download the principle of software, there is a zip version of the EXE version.1) J

Introduction to Web Game Development Tutorial II (game mode + system) Http://www.php.net/article/20724.htm First, choose the development language Backstage: java. NET PHPFront Desk: Flex JavaScript AjaxDatabase: MySQL MSSQLIt really doesn't matter what kind of combination you use. The important thing is time and cost. The complexity of the place in data interact

In recent years with the rapid development of the Internet, for the Web front-end development of talent demand more and more, employment pay is also rising, with the industry, high-paying return attracted a lot of aspiring young people to join the internet industry. Is it good for girls to learn the web front or Java?Throughout the current Internet

the Web component, you need to specify it by Web.xml file. Depending on your needs, you can add folders or package under the root directory and web-inf/classes/. The Web module can be unzipped as a folder or deployed as a single war package (Web Archive), essentially a war package that is a zip-formatted jar file. Bec

Usually, the web crawler dug into the basic page static content, and dynamic Ajax fetching the content is I personally do not know how to get Ajax in the site onceHere is one of the many Ajax table refresh, period data, and provide other operations, as shown below:Suppose we need to dig a site:Example: those PDF files in a Web site, and download them downFirst: Y

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