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August 29, 2015 14:00
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起動引数として受け取ったURLを短縮して標準出力し、その短縮したURLに対するリダイレクトを提供するサーバをエラー処理しないことで、どれだけ短く書けるかという遊び。言語に付随する標準APIのみを利用して実装すること。
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public class Rx { | |
public static void main(String[] args) throws Exception { | |
rx.Observable.from(args) | |
.map(s -> java.util.Arrays.asList(Integer.toHexString( s.hashCode()), s)) | |
.reduce(com.sun.net.httpserver.HttpServer.create(new java.net.InetSocketAddress(8080), 0), (s, e) -> { | |
System.out.printf("http://localhost:%d/%s -> %s%n",s.getAddress().getPort(), e.get(0), e.get(1)); | |
return s.createContext("/" + e.get(0), ctx -> { | |
ctx.getResponseHeaders().add("Location", e.get(1)); | |
ctx.sendResponseHeaders(302, 0); | |
ctx.close(); | |
}).getServer(); | |
}).subscribe(serv -> serv.start()); | |
} | |
} |
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args.collect {return [ k: Integer.toHexString( it.hashCode()), v:it ]}.inject(com.sun.net.httpserver.HttpServer.create(new InetSocketAddress(8080), 0), { s, e -> | |
println "http://localhost:$s.address.port/$e.k -> $e.v" | |
return s.createContext("/$e.k", { | |
it.responseHeaders["Location"] = e.v | |
it.sendResponseHeaders(302,0) | |
it.close() | |
} as com.sun.net.httpserver.HttpHandler ).server | |
}).start() |
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public class Us { | |
public static void main(String... args) throws Exception { | |
java.util.stream.Stream.of(args) | |
.map(s -> java.util.Arrays.asList(Integer.toHexString( s.hashCode()), s)) | |
.collect(Us::create, (s, e) -> { | |
System.out.printf("http://localhost:%d/%s -> %s%n", | |
s.getAddress().getPort(), e.get(0), e.get(1)); | |
s.createContext("/" + e.get(0), ctx -> { | |
ctx.getResponseHeaders().add("Location", e.get(1)); | |
ctx.sendResponseHeaders(302, 0); | |
ctx.close(); | |
}); | |
}, (f,b) -> {}).start(); | |
} | |
static com.sun.net.httpserver.HttpServer create() { | |
try { | |
return com.sun.net.httpserver.HttpServer.create(new java.net.InetSocketAddress(8080), 0); | |
} catch(Exception e) { | |
throw new RuntimeException(e); | |
} | |
} | |
} |
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