開一個專案叫 jersey,然後按下面加入代碼:
// build.gradle plugins { id 'war' //id 'org.gretty' version '2.1.0' id 'org.akhikhl.gretty' version '2.0.0' } // 'jetty7', 'jetty8', 'jetty9', 'jetty9.3', 'jetty9.4', 'tomcat7', 'tomcat8' //gretty.servletContainer='jetty9' repositories { jcenter() } dependencies { compile 'org.glassfish.jersey.containers:jersey-container-servlet:2.26' compile 'org.glassfish.jersey.inject:jersey-hk2:2.27' }
// src/main/webapp/WEB-INF/web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>My JAX-RS</display-name> <servlet> <servlet-name>jersey-servlet</servlet-name> <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class> <init-param> <param-name>jersey.config.server.provider.packages</param-name> <param-value>demo</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>jersey-servlet</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> </web-app>
// src/main/java/demo/Hello.java package demo; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.core.Response; @Path("/hello") public class Hello { @GET() public String hello() { return "hello"; } @GET @Path("/{name}") public Response getMessage(@PathParam("name") String name) { String outMsg = "Hello " + name + "!"; return Response.status(200).entity(outMsg).build(); } }
接下來執行 gradle appRun
$ gradle appRun :prepareInplaceWebAppFolder UP-TO-DATE :createInplaceWebAppFolder UP-TO-DATE :compileJava :processResources NO-SOURCE :classes :prepareInplaceWebAppClasses :prepareInplaceWebApp :appRun 19:46:58 INFO Jetty 9.2.24.v20180105 started and listening on port 8080 19:46:58 INFO JAX-RS Application Demo runs at: 19:46:58 INFO http://localhost:8080/jersey > Task :appRun Press any key to stop the server. <===========--> 87% EXECUTING [17s] > :appRun
然後就可以測試了:
- http://localhost:8080/jersey/hello
- http://localhost:8080/jersey/hello/John
備註:
- web.xml 的 "param-value" 必須跟套件名一樣,jersey 才會作用。
- 用 gretty 試跑的時候,URL 是帶上專案名稱,像這裡是 "/jersey"。放在 Servlet 上面跑的時候則是看檔案名稱,例如 "jersey.war";如果不想要這個路徑,可以改成 "ROOT.war"。
- web.xml 預設路徑是
src/main/webapp/WEB-INF
,但是可以在 Gradle 的 war plugin 設定。
備註2:Servlet 3 之後可以不寫 web.xml,改成繼承 ResourceConfig。
// src/main/java/demo/MyApplication.java package demo; import javax.ws.rs.ApplicationPath; import org.glassfish.jersey.server.ResourceConfig; @ApplicationPath("/") public class MyApplication extends ResourceConfig { public MyApplication() { packages("demo"); } }
備註3:如果 gretty 發生 Java9 相容問題,
Caused by: java.lang.RuntimeException: Error scanning entry META-INF/versions/9/module-info.class from jar file: .gradle/caches/modules-2/files-2.1/... Caused by: java.lang.RuntimeException: Error scanning entry module-info.class from jar file: .gradle/caches/modules-2/files-2.1/...可以設定參數
gretty.servletContainer
為 "jetty9.4" 或是 "tomcat8" 測試。
參考資料:
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