Question

我是JAVA的新手，我正在尝试使用netbeans IDE开发restful web服务，我有MYSQL数据库。我已经参考了netbeans教程来开发这个服务。我已经向实体类添加了一个方法返回传递了基于公司名称的行。我尝试了测试restful服务的选项，它给了我左侧的服务列表，但是当我尝试测试服务时（我在实体类中手动添加的方法）它给了我一个HTTP 404错误：找不到请求资源。我不明白问题所在。我正在使用Glassfish服务器。任何人都可以在这方面帮助我。谢谢你。以下是我的代码：

1.AbstractFacade.java

public abstract class AbstractFacade<T> {
    private Class<T> entityClass;

    public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

    protected abstract EntityManager getEntityManager();

    public void create(T entity) {
        getEntityManager().persist(entity);
    }

    public void edit(T entity) {
        getEntityManager().merge(entity);
    }

    public void remove(T entity) {
        getEntityManager().remove(getEntityManager().merge(entity));
    }

    public T find(Object id) {
        return getEntityManager().find(entityClass, id);
    }

    public List<T> findAll() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        return getEntityManager().createQuery(cq).getResultList();
    }

    public List<T> findRange(int[] range) {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        q.setMaxResults(range[1] - range[0]);
        q.setFirstResult(range[0]);
        return q.getResultList();
    }

    public int count() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
        cq.select(getEntityManager().getCriteriaBuilder().count(rt));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        return ((Long) q.getSingleResult()).intValue();
    }
}

2.MyTableFacadeREST.java

@Stateless
@Path("com.entities.mytable")
public class MyTableFacadeREST extends AbstractFacade<MyTable> {
    @PersistenceContext(unitName = "WSDataBasePU")
    private EntityManager em;

    public MyTableFacadeREST() {
        super(MyTable.class);
    }

    @POST
    @Override
    @Consumes({"application/json", "application/xml"})
    public void create(MyTable entity) {
        super.create(entity);
    }

    @PUT
    @Override
    @Consumes({"application/json", "application/xml"})
    public void edit(MyTable entity) {
        super.edit(entity);
    }

    @DELETE
    @Path("{id}")
    public void remove(@PathParam("id") Integer id) {
        super.remove(super.find(id));
    }

    @GET
    @Path("{id}")
    @Produces({"application/json", "application/xml"})
    public MyTable find(@PathParam("id") Integer id) {
        return super.find(id);
    }

    @GET
    @Override
    @Produces({"application/json", "application/xml"})
    public List<MyTable> findAll() {
        return super.findAll();
    }

    @GET
    @Path("{from}/{to}")
    @Produces({"application/json", "application/xml"})
    public List<MyTable> 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());
    }

//added method to fetch rows corresponding to company passed
   @GET
    @Path("companyname/{companyname}")
    @Produces({"application/json", "application/xml"})
    public List<MyTable> findByCompanyname(@PathParam("companyname") String name){
       return (List<MyTable>)(MyTable)em.createNamedQuery("MyTable.findByCompanyname").setParameter("companyname",name).getResultList();
    }
    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

}

3.MyTable.java

@Entity
@Table(name = "MyTable")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "MyTable.findAll", query = "SELECT m FROM MyTable m"),
    @NamedQuery(name = "MyTable.findByCompanyid", query = "SELECT m FROM MyTable m WHERE m.companyid = :companyid"),
    @NamedQuery(name = "MyTable.findByCompanyname", query = "SELECT m FROM MyTable m WHERE m.companyname = :companyname"),
    @NamedQuery(name = "MyTable.findByCompanyasset", query = "SELECT m FROM MyTable m WHERE m.companyasset = :companyasset"),
    @NamedQuery(name = "MyTable.findByAssetname", query = "SELECT m FROM MyTable m WHERE m.assetname = :assetname"),
    @NamedQuery(name = "MyTable.findByAssetdescription", query = "SELECT m FROM MyTable m WHERE m.assetdescription = :assetdescription")})
public class MyTable implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @NotNull
    @Column(name = "Company_id")
    private Integer companyid;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "Company_name")
    private String companyname;
    @Size(max = 255)
    @Column(name = "Company_asset")
    private String companyasset;
    @Size(max = 255)
    @Column(name = "Asset_name")
    private String assetname;
    @Size(max = 255)
    @Column(name = "Asset_description")
    private String assetdescription;

    public MyTable() {
    }

    public MyTable(Integer companyid) {
        this.companyid = companyid;
    }

    public MyTable(Integer companyid, String companyname) {
        this.companyid = companyid;
        this.companyname = companyname;
    }

    public Integer getCompanyid() {
        return companyid;
    }

    public void setCompanyid(Integer companyid) {
        this.companyid = companyid;
    }

    public String getCompanyname() {
        return companyname;
    }

    public void setCompanyname(String companyname) {
        this.companyname = companyname;
    }

    public String getCompanyasset() {
        return companyasset;
    }

    public void setCompanyasset(String companyasset) {
        this.companyasset = companyasset;
    }

    public String getAssetname() {
        return assetname;
    }

    public void setAssetname(String assetname) {
        this.assetname = assetname;
    }

    public String getAssetdescription() {
        return assetdescription;
    }

    public void setAssetdescription(String assetdescription) {
        this.assetdescription = assetdescription;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (companyid != null ? companyid.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof MyTable)) {
            return false;
        }
        MyTable other = (MyTable) object;
        if ((this.companyid == null && other.companyid != null) || (this.companyid != null && !this.companyid.equals(other.companyid))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "com.entities.MyTable[ companyid=" + companyid + " ]";
    }

}

Answer 1

首先，看看您的基本网址是什么。为此，您可以尝试单击netbeans中的run（在项目中双击）。然后添加到基本网址“/com.entities.mytable”，如资源中的注释路径所示。

Answer 2

问题可能是您没有为您的服务定义基本网址。您需要告诉JAX-RS（Jersey是GlassFish中的实现），它必须截取哪个url模式作为您的端点（基本URL）。

实现此目的的一种方法是使用可以添加到项目中任何包的Application Class（您也可以在web.xml中定义必要的）。 See this answer for a simple Application Class

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2 个答案: