RESTEasy是来自JBoss / RedHat的JAX-RS实现，并且内置于JBoss 6之后。
在这里，我将向您展示如何使用RESTEasy和JBossAS7.1.1.FINAL开发一个简单的RESTful Web服务应用程序。
步骤＃1：使用Maven配置RESTEasy依赖项。

<project xmlns='http:maven.apache.orgPOM4.0.0' xmlns:xsi='http:www.w3.org2001XMLSchema-instance'xsi:schemaLocation='http:maven.apache.orgPOM4.0.0 http:maven.apache.orgmaven-v4_0_0.xsd'><modelVersion>4.0.0<modelVersion> <groupId>com.sivalabs<groupId><artifactId>resteasy-demo<artifactId><version>0.1<version>  <packaging>war<packaging><name>resteasy-demo Maven Webapp<name><build><finalName>resteasy-demo<finalName><build><dependencies><dependency><groupId>junit<groupId><artifactId>junit<artifactId><version>4.8.2<version><scope>test<scope><dependency><dependency><groupId>org.jboss.resteasy<groupId><artifactId>resteasy-jaxrs<artifactId><version>2.3.2.FINAL<version><scope>provided<scope><dependency><dependency><groupId>org.jboss.resteasy<groupId><artifactId>resteasy-jaxb-provider<artifactId><version>2.3.2.FINAL<version><scope>provided<scope><dependency><dependency><groupId>org.jboss.resteasy<groupId><artifactId>jaxrs-api<artifactId><version>2.3.0.GA<version><scope>provided<scope><dependency><dependency><groupId>org.apache.httpcomponents<groupId><artifactId>httpclient<artifactId><version>4.1.2<version><scope>provided<scope><dependency><dependencies><project>

步骤＃2：在web.xml中配置RESTEasy

<web-app xmlns:xsi='http:www.w3.org2001XMLSchema-instance' xmlns='http:java.sun.comxmlnsjavaee' xmlns:web='http:java.sun.comxmlnsjavaeeweb-app_2_5.xsd' xsi:schemaLocation='http:java.sun.comxmlnsjavaee http:java.sun.comxmlnsjavaeeweb-app_3_0.xsd' id='WebApp_ID' version='3.0'><listener><listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap<listener-class><listener><servlet><servlet-name>Resteasy<servlet-name><servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher<servlet-class><servlet><servlet-mapping><servlet-name>Resteasy<servlet-name><url-pattern>rest*<url-pattern><servlet-mapping><context-param><param-name>resteasy.servlet.mapping.prefix<param-name><param-value>rest<param-value><context-param><context-param><param-name>resteasy.scan<param-name><param-value>true<param-value><context-param><web-app>

步骤＃3：创建User域类，MockUserTable类以将User对象存储在内存中以进行测试，并创建UserResource类以将对CRUD的操作公开为RESTful Web服务。

package com.sivalabs.resteasydemo;import java.util.Date;import javax.xml.bind.annotation.XmlAccessType;import javax.xml.bind.annotation.XmlAccessorType;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement@XmlAccessorType(XmlAccessType.FIELD)public class User {private Integer id;private String name;private String email;private Date dob;setters and getters}package com.sivalabs.resteasydemo;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import com.sivalabs.resteasydemo.User;public class MockUserTable {private static Map<Integer, User> USER_MAP = new HashMap<Integer, User>();static{USER_MAP.put(1, new User(1,'admin','admin@gmail.com',new Date()));USER_MAP.put(2, new User(2,'test','test@gmail.com',new Date()));}public static void save(User user){USER_MAP.put(user.getId(), user);}public static User getById(Integer id){return USER_MAP.get(id);}public static List<User> getAll(){List<User> users = new ArrayList<User>(USER_MAP.values());return users;}public static void delete(Integer id){USER_MAP.remove(id);} }package com.sivalabs.resteasydemo;import java.util.List;import javax.ws.rs.DELETE;import javax.ws.rs.GET;import javax.ws.rs.POST;import javax.ws.rs.Path;import javax.ws.rs.PathParam;import javax.ws.rs.Produces;import javax.ws.rs.core.GenericEntity;import javax.ws.rs.core.MediaType;import javax.ws.rs.core.Response;import com.sivalabs.resteasydemo.MockUserTable;@Path('users')@Produces(MediaType.APPLICATION_XML)public class UserResource {@Path('')@GETpublic Response getUsersXML() {List<User> users = MockUserTable.getAll();GenericEntity<List<User>> ge = new GenericEntity<List<User>>(users){};return Response.ok(ge).build();}@Path('{id}')@GETpublic Response getUserXMLById(@PathParam('id') Integer id) {return Response.ok(MockUserTable.getById(id)).build();}@Path('')@POSTpublic Response saveUser(User user) {MockUserTable.save(user);return Response.ok('<status>success<status>').build();}@Path('{id}')@DELETEpublic Response deleteUser(@PathParam('id') Integer id) {MockUserTable.delete(id);return Response.ok('<status>success<status>').build();}}

步骤＃6：使用JUnit TestCase测试REST Web服务。

package com.sivalabs.resteasydemo;import java.util.List;import org.jboss.resteasy.client.ClientRequest;import org.jboss.resteasy.client.ClientResponse;import org.jboss.resteasy.util.GenericType;import org.junit.Assert;import org.junit.Test;import com.sivalabs.resteasydemo.User;public class UserResourceTest {static final String ROOT_URL = 'http:localhost:8080resteasy-demorest';@Testpublic void testGetUsers() throws Exception {ClientRequest request = new ClientRequest(ROOT_URL+'users');ClientResponse<List<User>> response = request.get(new GenericType<List<User>>(){});List<User> users = response.getEntity();Assert.assertNotNull(users);}@Testpublic void testGetUserById() throws Exception {ClientRequest request = new ClientRequest(ROOT_URL+'users1');ClientResponse<User> response = request.get(User.class);User user = response.getEntity();Assert.assertNotNull(user);}@Testpublic void testSaveUser() throws Exception {User user = new User();user.setId(3);user.setName('User3');user.setEmail('user3@gmail.com');ClientRequest request = new ClientRequest(ROOT_URL+'users');request.body('applicationxml', user);ClientResponse<String> response = request.post(String.class);String statusXML = response.getEntity();Assert.assertNotNull(statusXML);}@Testpublic void testDeleteUser() throws Exception {ClientRequest request = new ClientRequest(ROOT_URL+'users2');ClientResponse<String> response = request.delete(String.class);String statusXML = response.getEntity();Assert.assertNotNull(statusXML);}}

步骤7：要测试REST服务，我们可以使用REST客户端工具。
您可以在http://code.google.com/a/eclipselabs.org/p/restclient-tool/下载REST客户端工具。

重要注意事项：
1.应先注册org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap监听器。

2.如果HttpServletDispatcher Servlet URL模式不是/ *，则应配置resteasy.servlet.mapping.prefix <context-param>

继续本教程的第二部分 。

参考： RESTEasy教程第1部分： JCG合作伙伴 Siva Reddy的基础知识，来自My Experiments on Technology博客。