Use leiningen to create the first clojure project 2

Add a CLJ-HTTP dependency to the Project 1 project file:

(defproject project1 "0.1.0-SNAPSHOT"  :description "FIXME: write description"  :url "http://example.com/FIXME"  :license {:name "Eclipse Public License"            :url "http://www.eclipse.org/legal/epl-v10.html"}  :dependencies [[org.clojure/clojure "1.4.0"]                 [clj-http "0.6.3"]                 ])

: SRC is not set here, so the default value is actually used, src directory.

Version can refer to the website: https://clojars.org/search? Q = CLJ-HTTP

The clojars.org site is very useful, please remember.

Open the repl session and you will see a bunch of download dependency information:

~/project1$ lein replCould not find artifact clj-http:clj-http:pom:0.6.3 in central (http://repo1.maven.org/maven2)Retrieving clj-http/clj-http/0.6.3/clj-http-0.6.3.pom (4k)    from https://clojars.org/repo/Retrieving org/apache/httpcomponents/httpcore/4.2.3/httpcore-4.2.3.pom (6k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpcomponents-core/4.2.3/httpcomponents-core-4.2.3.pom (11k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/project/6/project-6.pom (23k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpclient/4.2.2/httpclient-4.2.2.pom (6k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpcomponents-client/4.2.2/httpcomponents-client-4.2.2.pom (14k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpcore/4.2.2/httpcore-4.2.2.pom (6k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpcomponents-core/4.2.2/httpcomponents-core-4.2.2.pom (11k)    from http://repo1.maven.org/maven2/Retrieving commons-codec/commons-codec/1.6/commons-codec-1.6.pom (11k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpmime/4.2.2/httpmime-4.2.2.pom (5k)    from http://repo1.maven.org/maven2/Retrieving commons-io/commons-io/2.4/commons-io-2.4.pom (10k)    from http://repo1.maven.org/maven2/Retrieving org/apache/commons/commons-parent/25/commons-parent-25.pom (47k)    from http://repo1.maven.org/maven2/Could not find artifact slingshot:slingshot:pom:0.10.3 in central (http://repo1.maven.org/maven2)Retrieving slingshot/slingshot/0.10.3/slingshot-0.10.3.pom (2k)    from https://clojars.org/repo/Could not find artifact cheshire:cheshire:pom:5.0.1 in central (http://repo1.maven.org/maven2)Retrieving cheshire/cheshire/5.0.1/cheshire-5.0.1.pom (3k)    from https://clojars.org/repo/Retrieving com/fasterxml/jackson/core/jackson-core/2.1.1/jackson-core-2.1.1.pom (6k)    from http://repo1.maven.org/maven2/Retrieving com/fasterxml/oss-parent/4/oss-parent-4.pom (18k)    from http://repo1.maven.org/maven2/Retrieving com/fasterxml/jackson/dataformat/jackson-dataformat-smile/2.1.1/jackson-dataformat-smile-2.1.1.pom (3k)    from http://repo1.maven.org/maven2/Could not find artifact crouton:crouton:pom:0.1.1 in central (http://repo1.maven.org/maven2)Retrieving crouton/crouton/0.1.1/crouton-0.1.1.pom (3k)    from https://clojars.org/repo/Retrieving org/jsoup/jsoup/1.7.1/jsoup-1.7.1.pom (5k)    from http://repo1.maven.org/maven2/Could not find artifact clj-http:clj-http:jar:0.6.3 in central (http://repo1.maven.org/maven2)Retrieving commons-codec/commons-codec/1.6/commons-codec-1.6.jar (227k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpmime/4.2.2/httpmime-4.2.2.jar (26k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpclient/4.2.2/httpclient-4.2.2.jar (418k)    from http://repo1.maven.org/maven2/Retrieving org/apache/httpcomponents/httpcore/4.2.3/httpcore-4.2.3.jar (222k)    from http://repo1.maven.org/maven2/Retrieving commons-io/commons-io/2.4/commons-io-2.4.jar (181k)    from http://repo1.maven.org/maven2/Could not find artifact slingshot:slingshot:jar:0.10.3 in central (http://repo1.maven.org/maven2)Could not find artifact crouton:crouton:jar:0.1.1 in central (http://repo1.maven.org/maven2)Retrieving org/jsoup/jsoup/1.7.1/jsoup-1.7.1.jar (272k)    from http://repo1.maven.org/maven2/Retrieving slingshot/slingshot/0.10.3/slingshot-0.10.3.jar (8k)    from https://clojars.org/repo/Retrieving crouton/crouton/0.1.1/crouton-0.1.1.jar (3k)    from https://clojars.org/repo/Retrieving clj-http/clj-http/0.6.3/clj-http-0.6.3.jar (19k)    from https://clojars.org/repo/nREPL server started on port 59868REPL-y 0.1.0-beta10Clojure 1.4.0    Exit: Control+D or (exit) or (quit)Commands: (user/help)    Docs: (doc function-name-here)          (find-doc "part-of-name-here")  Source: (source function-name-here)          (user/sourcery function-name-here) Javadoc: (javadoc java-object-or-class-here)Examples from clojuredocs.org: [clojuredocs or cdoc]          (user/clojuredocs name-here)          (user/clojuredocs "ns-here" "name-here")user=>

When you start a repl session, you can find that the dependency of project1 does not exist. It is intelligent to automatically download it. I just don't understand how it is implemented. This question should be put aside first and then solved later.

Then you need to restart the session.

Modify the source code of the Project obtained in the previous article. In the src/project/CORE. CLJ file, change the foo function to main:

(ns project1.core)(defn -main  "I don't do a whole lot."  [& args]  (println "Hello, World!"))

Okay. input the following command in the repl session. Everything is normal:

user=> (require 'project1.core)niluser=> (source project1.core/-main)(defn -main  "I don't do a whole lot."  [& args]  (println "Hello, World!"))niluser=> (project1.core/-main)Hello, World!nil