使用jax-rs和dubbo来搭建restfull接口

需要用到的框架：
  • jax-rs
  • dubbo
  • resteasy-client
  • org.mortbay.jetty(因为dubbo支持的jetty版本比较老)
完整的pom文件：
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<dependencies>
    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>jaxrs-api</artifactId>
        <version>3.0.12.Final</version>
    </dependency>
    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-client</artifactId>
        <version>3.1.4.Final</version>
    </dependency>
    <!--<dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-server</artifactId>
        <version>9.4.0.M1</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-webapp-logging</artifactId>
        <version>9.0.0</version>
    </dependency>-->
    <dependency>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty</artifactId>
        <version>6.1.26</version>
    </dependency>

    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.1.0.Final</version>
    </dependency>
    <!--<dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.1.13.Final</version>
    </dependency>-->
    <dependency>
        <groupId>life.qzz</groupId>
        <artifactId>demo5.api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>
provider:
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@Path("demo")
public class DemoServiceImpl implements DemoService {
    private static Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);

    @Path("hello")
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public String sayHello(String name) {
        logger.debug("服务调用开始");
        return "{\"message\": \"hello\"}";
    }
}
dubbo的配置：

dubbo.properties

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dubbo.application.name=helloapp
dubbo.registry.address = zookeeper://localhost:2181
dubbo.protocol.name=rest
dubbo.protocol.port = 20880

在dubbo.properties中指定协议为rest不起作用，需要在xml中指定。

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<!-- 需要在这里指定协议,默认的server为jetty-->
<dubbo:protocol name="rest" port="20880"/>
<dubbo:service interface="life.qzz.dubbodemo.api.DemoService" ref="demoService"/>
<bean id="demoService" class="life.qzz.dubbodemo.api.impl.DemoServiceImpl"/>

使用postman发起请求：http://localhost:20880/demo/hello，返回结果为：

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{"message": "hello"}

这里简单地返回了一个字符串，如果要像spring mvc一样自动将返回对象序列化，得自己实现，会报下面的异常。

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org.jboss.resteasy.core.NoMessageBodyWriterFoundFailure: Could not find MessageBodyWriter for response object of type: life.qzz.dubbodemo.api.User of media type: application/json

如要使用jackson来序列化Json，加入以下依赖：

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<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-jackson-provider</artifactId>
    <version>3.1.4.Final</version>
</dependency>