scrala
scrala is a web crawling framework for scala, which is inspired by scrapy.
Installation
From Docker
Create a Dockerfile in your project.
FROM gaocegege/scrala:latest
// COPY the build.sbt and the src to the container
Run a single command in docker
docker run -v <your src>:/app/src -v <your ivy2 directory>:/root/.ivy2 gaocegege/scrala
From SBT
Step 1. Add it in your build.sbt at the end of resolvers:
resolvers += "jitpack" at "https://jitpack.io"
Step 2. Add the dependency
libraryDependencies += "com.github.gaocegege" % "scrala" % "0.1.5"
From Source Code
git clone https://github.com/gaocegege/scrala.git
cd ./scrala
sbt assembly
You will get the jar in ./target/scala-<version>/.
Example
import com.gaocegege.scrala.core.spider.impl.DefaultSpider
import com.gaocegege.scrala.core.common.response.Response
import java.io.BufferedReader
import java.io.InputStreamReader
import com.gaocegege.scrala.core.common.response.impl.HttpResponse
import com.gaocegege.scrala.core.common.response.impl.HttpResponse
class TestSpider extends DefaultSpider {
def startUrl = List[String]("http://www.gaocegege.com/resume")
def parse(response: HttpResponse): Unit = {
val links = (response getContentParser) select ("a")
for (i <- 0 to links.size() - 1) {
request(((links get (i)) attr ("href")), printIt)
}
}
def printIt(response: HttpResponse): Unit = {
println((response getContentParser) title)
}
}
object Main {
def main(args: Array[String]) {
val test = new TestSpider
test begin
}
}
Just like the scrapy, what you need to do is define a startUrl to tell me where to start, and override parse(...) to parse the response of the startUrl. And request(...) function is like yield scrapy.Request(...) in scrapy.
You can get the example project in the ./example/
For Developer
scrala is under active development, feel free to contribute documentation, test cases, pull requests, issues, and anything you want. I'm a newcomer to scala so the code is hard to read. I'm glad to see someone familiar with scala coding standards could do some code reviews for the repo :)