jersey服务端简单小示例

一个Forums的小示例,来总体看一看用jersey(2.22.2)来架设一个RESTful Web服务.

1.实体类,包名:net.iqido.bbs.entity

import javax.xml.bind.annotation.XmlRootElement;

/** * 实体:帐户/会员 * @author xiaofanku */

@XmlRootElement
public class Account {
   private int uid;
   private String mail;

   //ETC set/get
}

import java.util.Date;
import javax.xml.bind.annotation.XmlRootElement;

/** * 实体:话题 * @author xiaofanku */
@XmlRootElement
public class Topic {
    private long id;
    private String title;
    private Account author;
    private Date publish;

    //ETC get/set
}

2.用来分页显示实体的范型类，包名:net.iqido.bbs.util

import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlSeeAlso;
import net.iqido.bbs.entity.Topic;

/** * 注意:没有XmlSeeAlso注解无法解析 * @author xiaofanku * @param <T> */
@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE)
@XmlSeeAlso({Topic.class})
public class PageList<T> {
    @XmlElement
    private int total;
    @XmlElement
    private int page;
    @XmlElement
    private int pageSize;
    @XmlElementWrapper
    @XmlElement
    private List<T> result;

    //ETC set/get
}

3.RESTful资源,包名:net.iqido.bbs

import java.util.Map;
import java.util.Set;
import javax.ws.rs.core.Application;


/** * app应用配置 * @author xiaofanku */
@javax.ws.rs.ApplicationPath("app")
public class ApplicationConfig extends Application {

    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> resources = new java.util.HashSet<>();
        addRestResourceClasses(resources);
        resources.add(org.glassfish.jersey.moxy.json.MoxyJsonFeature.class);
        resources.add(JsonMoxyConfigurationContextResolver.class);
        return resources;
    }

    private void addRestResourceClasses(Set<Class<?>> resources) {
        resources.add(net.iqido.bbs.TopicResource.class);
    }
}

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
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.MediaType;
import net.iqido.bbs.entity.Account;
import net.iqido.bbs.entity.Topic;
import net.iqido.bbs.util.PageList;
import org.glassfish.jersey.server.JSONP;

/** * 话题资源 * @author xiaofanku */
@Path("topic")
public class TopicResource {
    @GET
    @Path("{id}")
    @Produces({MediaType.APPLICATION_XML,MediaType.APPLICATION_JSON})
    public Topic get(@PathParam("id")long id){
        //测试数据
        Account a=new Account();
        a.setUid(1);
        a.setMail("[email protected]");
        Topic c=new Topic();
        c.setId(100010);
        c.setAuthor(a);
        c.setTitle("this is demo title1");
        c.setPublish(new Date());
        return c;
    }
    @POST
    @Path("build")
    @Produces({MediaType.APPLICATION_XML,MediaType.APPLICATION_JSON})
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public Topic post(
            @FormParam("title")String title,
            @FormParam("account")int uid,
            @FormParam("author")String mail){
        //测试数据
        Account a=new Account();
        a.setUid(uid);
        a.setMail(mail);
        Topic c=new Topic();
        c.setId(10);//increment
        c.setAuthor(a);
        c.setTitle(title);
        c.setPublish(new Date());//now()
        return c;
    }

    @GET
    @JSONP(callback = "eval", queryParam = "jsonpCallback")
    @Path("list/{page}/{pageSize}")
    @Produces({"application/xml; qs=0.9", "application/json","application/javascript"})
    public PageList<Topic> today(@PathParam("page")int page,@PathParam("pageSize")int pageSize){
        //测试数据
        Account a=new Account();
        a.setUid(1);
        a.setMail("[email protected]");

        List<Topic> result=new ArrayList<>();
        Topic c=new Topic();
        c.setId(100010);
        c.setAuthor(a);
        c.setTitle("this is demo title1");
        c.setPublish(new Date());

        Topic c1=new Topic();
        c1.setId(10010);
        c1.setAuthor(a);
        c1.setTitle("this is demo title2");
        c1.setPublish(new Date());

        result.add(c);
        result.add(c1);

        PageList<Topic> all=new PageList<>();
        all.setResult(result);
        all.setTotal(2);
        all.setPage(page);
        all.setPageSize(pageSize);
        return all;
    }
}

import javax.ws.rs.ext.ContextResolver;
import org.eclipse.persistence.jaxb.JAXBContextProperties;
import org.glassfish.jersey.moxy.json.MoxyJsonConfig;

/** * Eclipse Moxy json转换 * @author xiaofanku */
class JsonMoxyConfigurationContextResolver implements ContextResolver<MoxyJsonConfig> {

    private final MoxyJsonConfig config;

    public JsonMoxyConfigurationContextResolver() {
        this.config = new MoxyJsonConfig()
                .setAttributePrefix("")
                .setValueWrapper("value")
                .property(JAXBContextProperties.JSON_WRAPPER_AS_ARRAY_NAME, true)
                .setFormattedOutput(true)
                .setIncludeRoot(true)
                .setMarshalEmptyCollections(true);
    }

    @Override
    public MoxyJsonConfig getContext(Class<?> type) {

        return config;
    }

}

4.Maven pom.xml依赖

        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <!-- if your container implements Servlet API older than 3.0, use "jersey-container-servlet-core" -->
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.22.2</version>
        </dependency>
        <!-- Required only when you are using JAX-RS Client -->
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>2.22.2</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-moxy</artifactId>
            <version>2.22.2</version>
            <scope>compile</scope>
        </dependency>

5.环境
开发IDE:NetBeans 8.1
运行:Apache Tomcat/8.0.27
JVM:1.7.0_80-b15
注意:在GlassFish4.1.1中运行，会报以下异常:
java.lang.ClassNotFoundException: org.xml.sax.helpers.DefaultHandler not found by org.eclipse.persistence.moxy [276]

这主要是因为GF的modules中的org.eclipse.persistence.moxy版本问题.
bug报告可以查看

NoClassDefFoundError when doing bean validation

Webservices don’t work properly in 4.1.1

6.测试服务是否正常可以在地址中输入:
http://localhost:8084/forums/app/application.wadl

测试xml和json内容类型

测试jsonp

示例下载地址:http://download.csdn.net/detail/xiaofanku/9458987