首页 > 代码库 > 笔记:创建Jersey REST 服务,基于Maven
笔记:创建Jersey REST 服务,基于Maven
- 基于Java SE 形式的REST服务
- 创建项目
我们首选使用 archetypeGroupId 为 org.glassfish.jersey.archetypes 的原型,archetypeArtifactId为 jersey-quickstart-grizzly2 的原型,创建REST服务项目,使用 IDEA 创建项目如下:
点击 OK 后,使用该原始模型创建项目。
- 运行服务
项目创建好后,原始模型已经默认创建了一个REST服务,我们可以直接启动REST服务,进入项目的根目录,执行如下命令构建和启动服务:
mvn package
mvn exec:java
会启动REST服务,可以随时通过回车键停止服务,输出如下:
六月 19, 2017 11:12:23 下午 org.glassfish.grizzly.http.server.NetworkListener start
信息: Started listener bound to [localhost:8080]
六月 19, 2017 11:12:23 下午 org.glassfish.grizzly.http.server.HttpServer start
信息: [HttpServer] Started.
Jersey app started with WADL available at http://localhost:8080/myapp/application.wadl
Hit enter to stop it…
还提供了 WADL,通过访问 application.wadl 可以获取当前REST服务公布的接口:
????????<resources base="http://localhost:8080/myapp/">
????????????????<resource path="myresource">
????????????????????????<method id="getIt" name="GET">
????????????????????????????????<response>
????????????????????????????????????????<representation mediaType="text/plain"/>
????????????????????????????????</response>
????????????????????????</method>
????????????????</resource>
????????</resources>
- 访问服务
可以直接访问 http://localhost:8080/myapp/myresource 就可以访问REST服务,直接访问REST服务,会输出 Got it! 。
- 项目说明
启动服务的命令 mvn exec:java,该命令实际调用了 exec-maven-plugin 插件定义的一个值为 java 的 goal ,用以触发mainClass中的main函数,插件配置如下:
<plugin>
??????????<groupId>org.codehaus.mojo</groupId>
??????????<artifactId>exec-maven-plugin</artifactId>
??????????<version>1.2.1</version>
??????????<executions>
????????????????????????<execution>
????????????????????????????????????<goals>
????????????????????????????????????????????<goal>java</goal>
??????????????????????????????????</goals>
????????????????????????</execution>
????????????</executions>
????????????<configuration>
??????????????????????<mainClass>org.drsoft.rest.Main</mainClass>
????????????</configuration>
??</plugin>
REST服务类为 MyResource,其 @Path 中定义了资源路径,@GET中定义了GET方法getIt(),@Produces中定义了响应的类型为普通字符串,示例代码如下:
@Path("myresource")
public class MyResource {
??
????????@GET
????????@Produces(MediaType.TEXT_PLAIN)
????????public String getIt() {
????????????????return "Got it!";
????????}
}
REST服务的单元测试类MyResourceTest,在单元测试类中,在执行单元测试前需要启动服务,并使用Jersey Client中定义的方法来调用REST服务,示例代码如下:
public class MyResourceTest {
????????private HttpServer server;
????????private WebTarget target;
????????@Before
????????public void setUp() throws Exception {
????????????????// start the server
????????????????server = Main.startServer();
????????????????// create the client
????????????????Client c = ClientBuilder.newClient();
??
????????????????// uncomment the following line if you want to enable
????????????????// support for JSON in the client (you also have to uncomment
????????????????// dependency on jersey-media-json module in pom.xml and Main.startServer())
????????????????// --
????????????????// c.configuration().enable(new org.glassfish.jersey.media.json.JsonJaxbFeature());
??
????????????????target = c.target(Main.BASE_URI);
????????}
??
????????@After
????????public void tearDown() throws Exception {
????????????????server.stop();
????????}
??
????????@Test
????????public void testGetIt() {
????????????????String responseMsg = target.path("myresource").request().get(String.class);
????????????????assertEquals("Got it!", responseMsg);
????????}
}
- 基于Servlet容器服务
- 创建项目
我们首选使用 archetypeGroupId 为 org.glassfish.jersey.archetypes 的原型,archetypeArtifactId为 jersey-quickstart-webapp 的原型,创建REST服务项目,使用 IDEA 创建项目如下:
- 运行服务
由于这个是Web项目,没有main函数,因此必须部署到Servlet容器中,才能将其运行,我们需要配置Tomcat,IDEA的配置如下:
- 点击 Run菜单的 Edit Configuration,在打开的窗体中增加 Tomcat 服务配置,指定Tomcat 的安装目录,并设置当前站点的部署的虚拟目录名称,如下:
??
点击OK后,就配置好Servlet容器,可以运行服务了
- 访问服务
服务启动后,我们可以访问 http://localhost:8080/RESTWebAPP/webapi/myresource 来调用REST服务,会输出 Got it!
- 项目说明
Web根目录的名称为webapp,默认的Servlet容器版本为2.5,并且配置了WEB-INF/web.xml文件来配置REST服务,web.xml配置如下:
<?xml version="1.0" encoding="UTF-8"?>
<!-- This web.xml file is not required when using Servlet 3.0 container,
see implementation details http://jersey.java.net/nonav/documentation/latest/jax-rs.html -->
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
????????<servlet>
????????????????<servlet-name>Jersey Web Application</servlet-name>
????????????????<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
????????????????<init-param>
????????????????????????<param-name>jersey.config.server.provider.packages</param-name>
????????????????????????<param-value>org.drsoft.rest</param-value>
????????????????</init-param>
????????????????<load-on-startup>1</load-on-startup>
????????</servlet>
????????<servlet-mapping>
????????????????<servlet-name>Jersey Web Application</servlet-name>
????????????????<url-pattern>/webapi/*</url-pattern>
????????</servlet-mapping>
</web-app>
??
笔记:创建Jersey REST 服务,基于Maven