使用resteasy作为dubbox消费者
dubbox服务提供者是REST风格的,消费者可能是从dubbox过来的,也可能是从第三方外部系统过来的。后者的话我们没得选,只能以服务提供者直连,服务治理平台和监控中心手再长,也管不到别人的地盘。但如果是dubbox自己作为消费端,那么就可以很容易配置各种服务治理参数了,也能被监控中心实时盯着。有利必有弊,本来dubbox提供REST风格的http调用就是为了方便异构客户端到服务提供者来交流的,为了纳入dubbo系统再套一层消费者岂不是脱裤子放屁,多此一举?多了一个人传话,对话就多了一层转换,多了一份丢话和失真的危险。
消费端用spring的REST注解是最简单的,但因为服务端已经用dubbox的RESTEasy框架了,所以消费端还得重新用spring自己的REST实现一遍。这里为了偷懒,消费端还是用RESTEasy来搞,直接把服务端用到的公共接口复制到消费端作为控制类即可。首先我们用JAX-RS定义接口和bean,放到公用API包里,然后服务端实现这些API,消费端新增一个controller类来调用API,最后在web配置文件里指定使用RESTEasy作为servlet容器。
1、公用接口,使用JAX-RS注解,暴露服务端所提供的服务
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import com.wlf.api.bean.Page;
@Path("/hello/world")
@Produces({MediaType.APPLICATION_JSON})
public interface MobileZoneResourceService
{
@GET
@Path("/nihao.jsp")
public Page queryToday(@QueryParam("param") String param);
}
公用bean,使用JAX-RS注解
import java.io.Serializable; import java.util.List; import java.util.Map; import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement public class Page implements Serializable { private static final long serialVersionUID = -680237712312747858L; private Integer start; private Integer pageSize; private Integer totalSize; public Integer getStart() { return start; } public void setStart(Integer start) { this.start = start; } public Integer getPageSize() { return pageSize; } public void setPageSize(Integer pageSize) { this.pageSize = pageSize; } public Integer getTotalSize() { return totalSize; } public void setTotalSize(Integer totalSize) { this.totalSize = totalSize; } }
2、服务提供者service类,注入DAO接口
import org.codehaus.jackson.map.ObjectMapper; import org.springframework.beans.factory.annotation.Autowired; import com.wulf.zoneresource.api.MobileZoneResourceService; import com.wulf.zoneresource.api.bean.Page; import com.wulf.zoneresource.provider.bean.BpmUserInfo; import com.wulf.zoneresource.provider.dao.ZoneResourceService; public class MobileZoneResourceServiceImpl implements MobileZoneResourceService { @Autowired private ZoneResourceService zoneResourceService; public Page queryToday(String param) { BpmUserInfo userinfo = null; ObjectMapper om = new ObjectMapper(); try { userinfo = om.readValue(param, BpmUserInfo.class); } catch (Exception e) { e.printStackTrace(); } Page page = zoneResourceService.queryToday(userinfo); return page; } }
DAO层接口
import com.wulf.zoneresource.api.bean.Page; import com.wulf.zoneresource.provider.bean.BpmUserInfo; public interface ZoneResourceService { public Page queryToday(BpmUserInfo userinfo); }
DAO层实现类就略过了
3、服务消费者控制类,提供http接口给外部调用,注入公共API
import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.QueryParam; import javax.ws.rs.core.MediaType; import org.springframework.beans.factory.annotation.Autowired; import com.wulf.zoneresource.api.MobileZoneResourceService; import com.wulf.zoneresource.api.bean.Page; @Path("/hello/world") @Produces({MediaType.APPLICATION_JSON}) public class MobileZoneResourceController { @Autowired private MobileZoneResourceService mobileZoneResourceService; @GET @Path("/nihao.jsp") public Page queryToday(@QueryParam("param") String param) { return mobileZoneResourceService.queryToday(param); } }
4、web配置
消费者web.xml,使用resteasy作为web容器分发控制器
<web-app> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:META-INF/spring/consumer.xml</param-value> </context-param> <listener> <listener-class>com.alibaba.dubbo.remoting.http.servlet.BootstrapListener </listener-class> </listener> <listener> <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap </listener-class> </listener> <listener> <listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>resteasy-servlet</servlet-name> <servlet-class> org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher </servlet-class> </servlet> <servlet-mapping> <servlet-name>resteasy-servlet</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> </web-app>
提供者web.xml,使用dubbo作为web容器分发控制器
<web-app> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:META-INF/spring/provider.xml</param-value> </context-param> <listener> <listener-class>com.alibaba.dubbo.remoting.http.servlet.BootstrapListener </listener-class> </listener> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>com.alibaba.dubbo.remoting.http.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> </web-app>
5、dubbo配置
消费者,通过把控制器配置为bean来加载
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:annotation-config /> <!-- 消费方应用信息,用于计算依赖关系 --> <dubbo:application name="zr_consumer" /> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <!-- 消费者接口 --> <dubbo:reference id="mobileZoneResourceService" interface="com.wulf.zoneresource.api.MobileZoneResourceService" /> <!-- 对外control --> <bean id="mobileZoneResourceController" class="com.wulf.zoneresource.consumer.control.MobileZoneResourceController" /> </beans>
提供者
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:annotation-config /> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="zr_provider" /> <context:property-placeholder location="classpath:global.properties" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry protocol="zookeeper" address="${zk.servers}" /> <!-- 采用dubbox提供的REST风格服务(基于resteasy) --> <dubbo:protocol name="rest" server="servlet" port="${rest.server.port}" /> <!-- timeout远程服务调用超时时间(毫秒),适用所有服务 --> <!-- threads该服务线程池大小 ,适用所有服务 --> <!-- accepts限制服务器端接受的连接不能超过个数,适用所有服务 --> <dubbo:provider timeout="${timeout}" threads="${threads}" accepts="${accepts}" /> <!-- 暴露服务接口 一个服务可以用多个协议暴露,一个服务也可以注册到多个注册中心 --> <dubbo:service interface="com.wulf.zoneresource.api.MobileZoneResourceService" ref="mobileZoneResourceService" /> <!-- 和本地bean一样实现服务 --> <bean id="mobileZoneResourceService" class="com.wulf.zoneresource.provider.service.MobileZoneResourceServiceImpl" /> <bean id="zoneResourceService" class="com.wulf.zoneresource.provider.dao.ZoneResourceServiceImpl" /> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${driver.class}" /> <property name="url" value="${driver.url}" /> <property name="username" value="${db.username}" /> <property name="password" value="${db.password}" /> </bean> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <tx:annotation-driven transaction-manager="txManager" /> </beans>
global.properties
zk.servers=zookeeper://127.0.0.1:2181
rest.server.port=8098
timeout=5000
threads=100
accepts=1000
driver.class=oracle.jdbc.driver.OracleDriver
driver.url=jdbc:oracle:thin:@10.211.95.152:1521:testdba
db.username=ues
db.password=ues2017
消费者使用RESTEasy框架需要的maven依赖:
<dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jaxrs</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-client</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-netty</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jdk-http</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jackson-provider</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jaxb-provider</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-spring</artifactId> <version>3.0.7.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-servlet-initializer</artifactId> <version>3.0.7.Final</version> </dependency>