NetBeans_022：开发JavaEE 7 应用之五：使用RESTful Web Service实现查看和删除功能

开发运行环境：NetBeans7.3.1。

这里使用的是JAX-RS 2.0的特性，关于JAX-RS 2.0的介绍，请参考《JavaEE7 十大新特性》。

1. MovieClientBean.java
MovieClientBean.java是RESTful Web Service的Client端。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.glassfish.movieplex7.client;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import org.glassfish.movieplex7.entities.Movie;
import org.glassfish.movieplex7.json.MovieWriter;

/**
 *
 * @author pmma
 */
@Named
@RequestScoped
public class MovieClientBean {

    Client client;
    WebTarget target;
    @Inject
    MovieBackingBean bean;

    @PostConstruct
    public void init() {
        client = ClientBuilder.newClient();
        target = client.target(
                "http://localhost:8989/movieplex7/webresources/movie/");
    }

    @PreDestroy
    public void destroy() {
        client.close();
    }

    public Movie[] getMovies() {
        return target
                .request()
                .get(Movie[].class);
    }

    public Movie getMovie() {
        Movie m = target
                .path("{movie}")
                .resolveTemplate("movie", bean.getMovieId())
                .request()
                .get(Movie.class);
        return m;
    }

    public void deleteMovie() {
        target
                .path("{movieId}")
                .resolveTemplate("movieId", bean.getMovieId())
                .request()
                .delete();
    }

    public void addMovie() {
        Movie m = new Movie();
        m.setId(bean.getMovieId());
        m.setName(bean.getMovieName());
        m.setActors(bean.getActors());
        target
                .register(MovieWriter.class)
                .request()
                .post(Entity.entity(m, MediaType.APPLICATION_JSON));
    }
}

说明：

（1）ClientBuilder是Client API的主入口，它负责调用REST endpoints。

（2）JAX-RS provider负责创建Client实例， Client实例是“客户端”的“比较重”的对象，因此只在必要的时候创建，不用的时候要关闭。

（3）使用@Inject批注，依赖注入了另一个Managed Bean：MovieBackingBean，其定义见后面。

2. MovieFacadeREST.java

MovieFacadeREST.java是RESTful Web Service的Server端。

package org.glassfish.movieplex7.rest;

import java.util.List;

import javax.ejb.Stateless;

import javax.inject.Named;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;

import javax.ws.rs.Consumes;

import javax.ws.rs.DELETE;

import javax.ws.rs.GET;

import javax.ws.rs.POST;

import javax.ws.rs.PUT;

import javax.ws.rs.Path;

import javax.ws.rs.PathParam;

import javax.ws.rs.Produces;

import org.glassfish.movieplex7.entities.Movie;

/**

 * @author Arun Gupta

 */

@Named

@Stateless

@Path("movie")

public class MovieFacadeREST extends AbstractFacade {

    @PersistenceContext

    protected EntityManager em;

    public MovieFacadeREST() {

        super(Movie.class);

    }

    @POST

    @Override

    @Consumes({"application/xml", "application/json"})

    public void create(Movie entity) {

        super.create(entity);

    }

    @PUT

    @Override

    @Consumes({"application/xml", "application/json"})

    public void edit(Movie entity) {

        super.edit(entity);

    }

    @DELETE

    @Path("{id}")

    public void remove(@PathParam("id") Integer id) {

        super.remove(super.find(id));

    }

    @GET

    @Path("{id}")

    @Produces({"application/xml", "application/json"})

    public Movie find(@PathParam("id") Integer id) {

        return super.find(id);

    }

    @GET

    @Override

    @Produces({"application/xml", "application/json"})

    public List getAll() {

        return super.getAll();

    }

    @GET

    @Path("{from}/{to}")

    @Produces({"application/xml", "application/json"})

    public List findRange(@PathParam("from") Integer from, @PathParam("to") Integer to) {

        return super.findRange(new int[]{from, to});

    }

    @GET

    @Path("count")

    @Produces("text/plain")

    public String countREST() {

        return String.valueOf(super.count());

    }

    @Override

    protected EntityManager getEntityManager() {

        return em;

    }

    

}

3. movies.xhtml

<?xml version='1.0' encoding='UTF-8' ?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"

      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"

      xmlns:h="http://xmlns.jcp.org/jsf/html"

      xmlns:c="http://xmlns.jcp.org/jsp/jstl/core"

      xmlns:f="http://xmlns.jcp.org/jsf/core">

    <body>

        <ui:composition template="./../WEB-INF/template.xhtml">

            <ui:define name="content">

                <h:form prependId="false">

                    <h:selectOneRadio value="#{movieBackingBean.movieId}"

                                      layout="pageDirection">

                        <c:forEach items="#{movieClientBean.movies}" var="m">

                            <f:selectItem itemValue="#{m.id}" itemLabel="#{m.name}"/>

                        </c:forEach>

                    </h:selectOneRadio>

                    <h:commandButton value="Details" action="movie" />

                    <h:commandButton value="Delete" action="movies"

                                     actionListener="#{movieClientBean.deleteMovie()}"/>

                    <h:commandButton value="New Movie" action="addmovie" />

                </h:form>

            </ui:define>

        </ui:composition>

    </body>

</html>

2. MovieBackingBean.java

为了能够把movieId从movies.xhtml传递到movie.xhtml，定义了MovieBackingBean.java。

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

package org.glassfish.movieplex7.client;

import java.io.Serializable;

import javax.enterprise.context.SessionScoped;

import javax.inject.Named;

/**

 *

 * @author pmma

 */

@Named

@SessionScoped

public class MovieBackingBean implements

        Serializable {

    int movieId;

    String movieName;

    String actors;

    public String getMovieName() {

        return movieName;

    }

    public void setMovieName(String movieName) {

        this.movieName = movieName;

    }

    public String getActors() {

        return actors;

    }

    public void setActors(String actors) {

        this.actors = actors;

    }

    public int getMovieId() {

        return movieId;

    }

    public void setMovieId(int movieId) {

        this.movieId = movieId;

    }

}

Project 下载：6. movieplex7(Restful).7z