使用Python可以实现以下功能:
$ apt-get install python
$ easy_install Flask
$ cat > hello.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run()
$ python hello.py
用于运行Web服务器的4个命令和7行代码确实非常令人印象深刻.
什么是Scala等价物？
小智 11
这使用了JDK6中内置的HttpServer类.随意提出改进建议,我是Scala的新手.
package org.test.simplehttpserver
import java.net.InetSocketAddress
import com.sun.net.httpserver.{HttpExchange, HttpHandler, HttpServer}
import collection.mutable.HashMap
abstract class SimpleHttpServerBase(val socketAddress: String = "127.0.0.1",
val port: Int = 8080,
val backlog: Int = 0) extends HttpHandler {
private val address = new InetSocketAddress(socketAddress, port)
private val server = HttpServer.create(address, backlog)
server.createContext("/", this)
def redirect(url: String) =
<html>
<head>
<meta http-equiv="Refresh" content={"0," + url}/>
</head>
<body>
You are being redirected to:
<a href={url}>
{url}
</a>
</body>
</html>
def respond(exchange: HttpExchange, code: Int = 200, body: String = "") {
val bytes = body.getBytes
exchange.sendResponseHeaders(code, bytes.size)
exchange.getResponseBody.write(bytes)
exchange.getResponseBody.write("\r\n\r\n".getBytes)
exchange.getResponseBody.close()
exchange.close()
}
def start() = server.start()
def stop(delay: Int = 1) = server.stop(delay)
}
abstract class SimpleHttpServer extends SimpleHttpServerBase {
private val mappings = new HashMap[String, () => Any]
def get(path: String)(action: => Any) = mappings += path -> (() => action)
def handle(exchange: HttpExchange) = mappings.get(exchange.getRequestURI.getPath) match {
case None => respond(exchange, 404)
case Some(action) => try {
respond(exchange, 200, action().toString)
} catch {
case ex: Exception => respond(exchange, 500, ex.toString)
}
}
}
class HelloApp extends SimpleHttpServer {
var count = 0
get("/") {
"There's nothing here"
}
get("/hello") {
"Hello, world!"
}
get("/markup") {
<html>
<head>
<title>Test Title</title>
</head>
<body>
Test Body
</body>
</html>
}
def countPage = <html>
<head>
<title>Test Title</title>
</head>
<body>
Count:
{count}<a href="/increaseCount">++</a>
<a href="/decreaseCount">--</a>
<a href="/resetCount">Reset</a>
</body>
</html>
get("/count") {
countPage
}
get("/resetCount") {
count = 0
redirect("/count")
}
get("/increaseCount") {
count = count + 1
redirect("/count")
}
get("/decreaseCount") {
count = count - 1
redirect("/count")
}
get("/error") {
throw new RuntimeException("Bad bad error occurred")
}
}
object Main {
def main(args: Array[String]) {
val server = new HelloApp()
server.start()
}
}
我知道Max alread 提到了它,但我无法抗拒指出Scalatra的 6行hello world:
import org.scalatra._
class ScalatraExample extends ScalatraServlet {
get("/") {
<h1>Hello, world!</h1>
}
}
无论如何,看看可用的Scala Web框架.
编辑
有一些关于如何轻松准备工具的讨论,尤其是关于Lift的问题.所以,这是一个关于Ubuntu的会议.我的大部分时间花在试图弄清楚Sun的Java在包管理器中的位置.无论如何,一旦安装了Java,这就是它的方式,所有消息都被省略了,所以我可以看到我实际需要输入的内容:
dcs@dcs-desktop:~$ wget -q -O bin/sbt-launch.jar http://simple-build-tool.googlecode.com/files/sbt-launch-0.7.4.jar
dcs@dcs-desktop:~$ echo 'java -Xmx512M -jar `dirname $0`/sbt-launch.jar "$@"' > bin/sbt
dcs@dcs-desktop:~$ chmod u+x bin/sbt
dcs@dcs-desktop:~$ mkdir app
dcs@dcs-desktop:~$ cd app
dcs@dcs-desktop:~/app$ sbt
Project does not exist, create new project? (y/N/s) s
> *lifty is org.lifty lifty 1.4
> lifty create project-blank sample 2.1
> reload
> update
> jetty-run
那里,web服务器正在运行.当然,你必须事先了解SBT和Lifty,甚至知道你用它们来运行Scala Lift程序,但是,另一方面,我从未听说过Flask,所以我肯定会花钱更多的时间试图弄清楚如何使用Python获取Web服务器应用程序而不是获取Lift一个.
我也没有在第一次尝试时做到正确 - 我尝试使用Scala 2.8.1(上面使用默认的2.7.7版本,虽然2.8.0也可以使用),但却发现没有Lift版本目前可用于该版本的Scala.另一方面,我已经安装了lifty,并且只是为了显示安装它的命令而卸载它.
我希望SBT有一个Debian/Ubuntu软件包 - 毕竟它只是一个小的shell脚本和一个jar文件,它负责下载Scala,Lift等,以及你需要的任何版本.
它是一个与Python和Ruby不同的模型,其中语言带有一个处理大多数事物的包管理器.