Jersey创建standalone server 一
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有时候,我们需要创建一个web service,但是并不需要部署在某个容器中,而是像一个应用程序一样运行,自己监听端口,解析HTTP请求,发送HTTP响应。
这样可以占用更少的资源,比如以前我碰到过一台租用的服务器由于核心线程数目的限制,Glassfish server都无法启动。现在有很多系统服务程序都是这样的实现,比如Gerrit2等。
Jersey也提供了这种方式,内部集成了grizzly2. 现在看看如何使用之。
首先用maven 的archetype从java站点上寻找合适的模板:
mvn archetype:generate -DarchetypeCatalog=http://download.java.net/maven/2很快就看到提示选择哪种模板:
[INFO] No archetype defined. Using maven-archetype-quickstart (org.apache.maven.archetypes:maven-archetype-quickstart:1.0)Choose archetype:1: http://download.java.net/maven/2 -> com.sun.jersey.archetypes:jersey-quickstart-grizzly (Archetype for creating a RESTful web application with Jersey and Grizzly)2: http://download.java.net/maven/2 -> com.sun.jersey.archetypes:jersey-quickstart-grizzly2 (Archetype for creating a RESTful web application with Jersey and Grizzly 2.x)3: http://download.java.net/maven/2 -> com.sun.jersey.archetypes:jersey-quickstart-webapp (Archetype for creating a Jersey based RESTful web application with WAR packaging)4: http://download.java.net/maven/2 -> com.sun.jersey.archetypes:jersey-quickstart-ejb (Archetype for creating a Jersey based RESTful EJB application with WAR packaging)5: http://download.java.net/maven/2 -> com.sun.faces:simple-jsf (Archetype for creating a simple JSF project)6: http://download.java.net/maven/2 -> com.sun.faces.regression:i_jsf_XXXX-archetype (Archetype for mojarra JSF regression tests)
我选择了2.
然后填入groupId,artifactID等等信息。
Define value for property 'groupId': : com.esriDefine value for property 'artifactId': : carrierDefine value for property 'version': 1.0-SNAPSHOT: : Define value for property 'package': com.esri: : Confirm properties configuration:groupId: com.esriartifactId: carrierversion: 1.0-SNAPSHOTpackage: com.esri Y: : y
经过一段时间下载后,一切就绪。一个工程被创建出来了。
现在编译后启动它:
mvn exec:java[INFO] Scanning for projects...[WARNING] [WARNING] Some problems were encountered while building the effective model for com.esri:carrier:jar:1.0-SNAPSHOT[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 58, column 21[WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.[WARNING] [INFO] [INFO] ------------------------------------------------------------------------[INFO] Building carrier 1.0-SNAPSHOT[INFO] ------------------------------------------------------------------------[INFO] [INFO] >>> exec-maven-plugin:1.1:java (default-cli) @ carrier >>>[INFO] [INFO] <<< exec-maven-plugin:1.1:java (default-cli) @ carrier <<<[INFO] [INFO] --- exec-maven-plugin:1.1:java (default-cli) @ carrier ---Starting grizzly2...Nov 6, 2012 1:10:27 PM org.glassfish.grizzly.http.server.NetworkListener startINFO: Started listener bound to [localhost:9998]Nov 6, 2012 1:10:27 PM org.glassfish.grizzly.http.server.HttpServer startINFO: [HttpServer] Started.Jersey app started with WADL available at http://localhost:9998/application.wadlHit enter to stop it...
可以看到监听了本地的9998端口。
通过浏览器打开下面的网址:
http://localhost:9998/application.wadl
看到如下页面:
This XML file does not appear to have any style information associated with it. The document tree is shown below.<application xmlns="http://research.sun.com/wadl/2006/10"><doc xmlns:jersey="http://jersey.java.net/" jersey:generatedBy="Jersey: 1.8 06/24/2011 12:17 PM"/><resources base="http://localhost:9998/"><resource path="/myresource"><method name="GET" id="getIt"><response><representation mediaType="text/plain"/></response></method></resource></resources></application>
描述了本应用程序提供了一个REST web service method,URL路径为/myresource
在浏览器上访问该地址:
http://localhost:9998/myresource
看到下面的结果。
Got it!
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