内嵌jetty 通过resteasy 实现restful接口

项目中有时会需要将一些功能暴露为webservice接口供其他应用调用，restful作为轻量级webservice是为不错的选择，使用resteasy我们需要很少的代码编写即可实现。

废话少说，上代码

示例model 

public class User {    private String id;    private String name;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

webservice接口

import javax.ws.rs.*;import javax.ws.rs.core.MediaType;import java.util.List;@Path("/user")public interface UserService {    String MEDIA_TYPE_JSON_UTF8 = MediaType.APPLICATION_JSON + ";charset=UTF-8";    @GET    @Path("/{id}")    @Produces(MEDIA_TYPE_JSON_UTF8)    User get(@PathParam("id") String id);    @GET    @Path("/all")    @Produces(MEDIA_TYPE_JSON_UTF8)    List<User> all();    @POST    @Path("/add")    @Produces(MEDIA_TYPE_JSON_UTF8)    @Consumes(MEDIA_TYPE_JSON_UTF8)    User add(User user);    @DELETE    @Path("/{id}")    @Produces(MEDIA_TYPE_JSON_UTF8)    void delete(@PathParam("id") String id);}

webservice接口实现（省略Dao实现）

import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import javax.annotation.Resource;import java.util.List;@Service("DefaultUserService")@Transactionalpublic class DefaultUserService implements UserService {    @Resource    private UserDao userDao;    @Override    public User get(String id) {        return userDao.get(id);    }    @Override    public List<User> all() {        return userDao.queryAll();    }    @Override    public User add(User user) {        return userDao.save(user);    }    @Override    public void delete(String id) {        userDao.delete(id);    }}

rest服务端（jetty内嵌实现）

import org.eclipse.jetty.server.Connector;import org.eclipse.jetty.server.Server;import org.eclipse.jetty.server.ServerConnector;import org.eclipse.jetty.servlet.ServletContextHandler;import org.eclipse.jetty.servlet.ServletHolder;import org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher;import org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap;import org.jboss.resteasy.plugins.spring.SpringContextLoaderListener;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import java.util.ArrayList;import java.util.List;@Component("restServer")public class RestServer {    private Logger logger = LoggerFactory.getLogger(getClass());    private Server restServer;    private String hostIp = "127.0.0.1";    private int port = 8097;    @PostConstruct    public void init(){        restServer = new Server();        final List<Connector> connectors = new ArrayList<>();        ServerConnector connectorV4 = new ServerConnector(restServer);        connectorV4.setHost(hostIp);        connectorV4.setPort(port);        connectors.add(connectorV4);        logger.info("IPV4 Connector Info:HostIP:"+this.hostIp+", Port:"+this.port);        restServer.setConnectors(connectors.toArray(new Connector[connectors.size()]));        ServletContextHandler contextHandler = new ServletContextHandler();        contextHandler.setContextPath("/");//设置上下文        contextHandler.addEventListener(new ResteasyBootstrap());        contextHandler.addEventListener(new SpringContextLoaderListener());//instead of ContextLoaderListener        contextHandler.setInitParameter("contextConfigLocation", "classpath:spring.xml");        ServletHolder holder = new ServletHolder(HttpServletDispatcher.class);        holder.setInitParameter("resteasy.servlet.mapping.prefix", "/");//resteasy前缀        holder.setInitOrder(1);        holder.setAsyncSupported(true);        contextHandler.addServlet(holder,"/*");//servlet过滤规则        restServer.setHandler(contextHandler);        try {            restServer.start();        } catch (Exception e) {            logger.error("rest server start failed!");            logger.error(e.getMessage(), e);        }    }    @PreDestroy    public void destroy() {        if(restServer != null){            try {                restServer.stop();            } catch (Exception e) {                logger.error(e.getMessage(), e);            }        }    }    public void setHostIp(String hostIp) {        this.hostIp = hostIp;    }    public void setPort(int port) {        this.port = port;    }    public static void main(String[] args) {        RestServer resourcePackageRest = new RestServer();        resourcePackageRest.init();        System.out.println("rest server started successful!");    }}

maven 依赖

<dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>jaxrs-api</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-jaxrs</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-jackson2-provider</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-servlet-initializer</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-spring</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>4.1.5.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>4.1.5.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-web</artifactId>            <version>4.1.5.RELEASE</version>        </dependency>        <dependency>            <groupId>org.eclipse.jetty</groupId>            <artifactId>jetty-server</artifactId>            <version>9.4.6.v20170531</version>        </dependency>        <dependency>            <groupId>org.eclipse.jetty</groupId>            <artifactId>jetty-servlet</artifactId>            <version>9.4.6.v20170531</version>        </dependency>

此时，restful服务端已成功部署,浏览器可访问测试，resteasy会根据注解自动部署为webservice

restful客户端代码,非常简单的代码，通过ResteasyClient的target方法，会生成ResteasyWebTarget对象，通过他的proxy可直接生成对应api接口的rest客户端

import user.apis.UserService;import org.jboss.resteasy.client.jaxrs.ResteasyClient;import org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder;import org.jboss.resteasy.client.jaxrs.ResteasyWebTarget;public class RestResourcePackageClient{    private ResteasyWebTarget baseTarget;    private String baseUri;    public void init(){        if(baseUri == null || baseUri.length()==0){            throw new NullPointerException("base uri is null!");        }        ResteasyClient client = new ResteasyClientBuilder().build();        baseTarget = client.target(baseUri);    }    public UserService userService() {        return baseTarget.proxy(UserService.class);    }        public void setBaseUri(String baseUri) {        this.baseUri = baseUri;    }}

客户端pom依赖

<dependency>            <groupId>user.respack</groupId>            <artifactId>respack-api</artifactId>            <version>${project.version}</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-client</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>org.jboss.resteasy</groupId>            <artifactId>resteasy-jackson2-provider</artifactId>            <version>3.0.11.Final</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-annotations</artifactId>            <version>2.9.0.pr4</version>        </dependency>

测试client

public class LocalTest {    public static void main(String[] args) throws BusinessException {        RestResourcePackageClient restResourcePackageClient = new RestResourcePackageClient();        restResourcePackageClient.setBaseUri("http://127.0.0.1:8097/");        restResourcePackageClient.init();        UserService userService = restResourcePackageClient.userService();        userService.all().forEach((user -> System.out.println("id:"+user.getId()+",name:"+user.getName())));    }}