为什么这个 REST 服务不工作?
Why this REST service is not working?
package model;
import java.net.URI;
import java.util.Collection;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.NotFoundException;
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 javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
@Path("/item")
@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
@Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
@Stateless
public class InfoRestService {
// the PersistenceContext annotation is a shortcut that hides the fact
// that, an entity manager is always obtained from an EntityManagerFactory.
// The peristitence.xml file defines persistence units which is supplied by
// name
// to the EntityManagerFactory, thus dictating settings and classes used by
// the
// entity manager
@PersistenceContext(unitName = "Task")
private EntityManager em;
// Inject UriInfo to build the uri used in the POST response
@Context
private UriInfo uriInfo;
@POST
public Response createItem(PersonInfo item) {
if (item == null) {
throw new BadRequestException();
}
em.persist(item);
// Build a uri with the Item id appended to the absolute path
// This is so the client gets the Item id and also has the path to the
// resource created
URI itemUri = uriInfo.getAbsolutePathBuilder().path(item.getId()).build();
// The created response will not have a body. The itemUri will be in the
// Header
return Response.created(itemUri).build();
}
@GET
@Path("{id}")
public Response getItem(@PathParam("id") String id) {
PersonInfo item = em.find(PersonInfo.class, id);
if (item == null) {
throw new NotFoundException();
}
return Response.ok(item).build();
}
// Response.ok() does not accept collections
// But we return a collection and JAX-RS will generate header 200 OK and
// will handle converting the collection to xml or json as the body
@GET
public Collection<PersonInfo> getItems() {
TypedQuery<PersonInfo> query = em.createNamedQuery("PersonInfo.findAll",
PersonInfo.class);
return query.getResultList();
}
@PUT
@Path("{id}")
public Response updateItem(PersonInfo item, @PathParam("id") String id) {
if (id == null) {
throw new BadRequestException();
}
// Ideally we should check the id is a valid UUID. Not implementing for
// now
item.setId(id);
em.merge(item);
return Response.ok().build();
}
@DELETE
@Path("{id}")
public Response deleteItem(@PathParam("id") String id) {
PersonInfo item = em.find(PersonInfo.class, id);
if (item == null) {
throw new NotFoundException();
}
em.remove(item);
return Response.noContent().build();
}
}
package model;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;
/**
* The persistent class for the person_info database table.
*
*/
@Entity
@XmlRootElement
@Table(name="person_info")
@NamedQuery(name="PersonInfo.findAll", query="SELECT p FROM PersonInfo p")
public class PersonInfo implements Serializable {
private static final long serialVersionUID = 1L;
@Id
private String id;
private String email;
@Column(name="first_name")
private String firstName;
@Column(name="last_name")
private String lastName;
public PersonInfo() {
}
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Task">
<jta-data-source>jdbc/DBtest</jta-data-source>
<class>model.PersonInfo</class>
</persistence-unit>
</persistence>
另一个class是应用
包装型号;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
@ApplicationPath("rest")
public class ApplicationConfig extends Application{
}
我真的不知道,连接正常..我正在使用 Glassfish 4 服务器和 MySQL 数据库...代码正在部署但是当我想访问 localhost:8080 /Task/..(我的应用程序)它唯一说的是:
"HTTP Status 404 - Not Found / Type Status report
messageNot Found
descriptionThe requested resource is not available."
您提供的代码有效(在注释掉与持久性相关的内容时),我猜您只是混淆了一些东西。
@ApplicationPath
注释设置项目名称后面的根上下文。
如果你的项目名称真的是 Task 你必须使用这个 URL: http://localhost:8080/Task/rest/item
否则:http://localhost:8080/YOUR_PROJECT_NAME/rest/item
另请参阅:
- How to set up JAX-RS Application using annotations only (no web.xml)?
package model;
import java.net.URI;
import java.util.Collection;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.NotFoundException;
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 javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
@Path("/item")
@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
@Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
@Stateless
public class InfoRestService {
// the PersistenceContext annotation is a shortcut that hides the fact
// that, an entity manager is always obtained from an EntityManagerFactory.
// The peristitence.xml file defines persistence units which is supplied by
// name
// to the EntityManagerFactory, thus dictating settings and classes used by
// the
// entity manager
@PersistenceContext(unitName = "Task")
private EntityManager em;
// Inject UriInfo to build the uri used in the POST response
@Context
private UriInfo uriInfo;
@POST
public Response createItem(PersonInfo item) {
if (item == null) {
throw new BadRequestException();
}
em.persist(item);
// Build a uri with the Item id appended to the absolute path
// This is so the client gets the Item id and also has the path to the
// resource created
URI itemUri = uriInfo.getAbsolutePathBuilder().path(item.getId()).build();
// The created response will not have a body. The itemUri will be in the
// Header
return Response.created(itemUri).build();
}
@GET
@Path("{id}")
public Response getItem(@PathParam("id") String id) {
PersonInfo item = em.find(PersonInfo.class, id);
if (item == null) {
throw new NotFoundException();
}
return Response.ok(item).build();
}
// Response.ok() does not accept collections
// But we return a collection and JAX-RS will generate header 200 OK and
// will handle converting the collection to xml or json as the body
@GET
public Collection<PersonInfo> getItems() {
TypedQuery<PersonInfo> query = em.createNamedQuery("PersonInfo.findAll",
PersonInfo.class);
return query.getResultList();
}
@PUT
@Path("{id}")
public Response updateItem(PersonInfo item, @PathParam("id") String id) {
if (id == null) {
throw new BadRequestException();
}
// Ideally we should check the id is a valid UUID. Not implementing for
// now
item.setId(id);
em.merge(item);
return Response.ok().build();
}
@DELETE
@Path("{id}")
public Response deleteItem(@PathParam("id") String id) {
PersonInfo item = em.find(PersonInfo.class, id);
if (item == null) {
throw new NotFoundException();
}
em.remove(item);
return Response.noContent().build();
}
}
package model;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;
/**
* The persistent class for the person_info database table.
*
*/
@Entity
@XmlRootElement
@Table(name="person_info")
@NamedQuery(name="PersonInfo.findAll", query="SELECT p FROM PersonInfo p")
public class PersonInfo implements Serializable {
private static final long serialVersionUID = 1L;
@Id
private String id;
private String email;
@Column(name="first_name")
private String firstName;
@Column(name="last_name")
private String lastName;
public PersonInfo() {
}
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Task">
<jta-data-source>jdbc/DBtest</jta-data-source>
<class>model.PersonInfo</class>
</persistence-unit>
</persistence>
另一个class是应用 包装型号;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
@ApplicationPath("rest")
public class ApplicationConfig extends Application{
}
我真的不知道,连接正常..我正在使用 Glassfish 4 服务器和 MySQL 数据库...代码正在部署但是当我想访问 localhost:8080 /Task/..(我的应用程序)它唯一说的是:
"HTTP Status 404 - Not Found / Type Status report
messageNot Found descriptionThe requested resource is not available."
您提供的代码有效(在注释掉与持久性相关的内容时),我猜您只是混淆了一些东西。
@ApplicationPath
注释设置项目名称后面的根上下文。
如果你的项目名称真的是 Task 你必须使用这个 URL: http://localhost:8080/Task/rest/item
否则:http://localhost:8080/YOUR_PROJECT_NAME/rest/item
另请参阅:
- How to set up JAX-RS Application using annotations only (no web.xml)?