restfull环境搭建-helloword（三）

2022-10-24 08:17:05

原文地址：http://only81.iteye.com/blog/1689537

This section creates a CRUD (Create, Read, Update, Delete) restful web service. It will allow to maintain a list of todos in your web application via HTTP calls.

本章，将调用restful的get，post，delete等相关的操作

首先创建一个bean类，Person类，代码如下：

package sample.hello.resources.bean;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement

public class Person {

    private String id;

    private String name;

    private String birthday;

    public Person() {

    }

    public Person(String id, String name, String birthday) {

        this.id = id;

        this.name = name;

        this.birthday = birthday;

    }

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getBirthday() {

        return birthday;

    }

    public void setBirthday(String birthday) {

        this.birthday = birthday;

    }

}

第二步，创建Person的工厂（单例模式），用户person对象的创建、删除和更新等操作：

package sample.hello.resources.bean;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

public class PersonFactory {

    /**

     * 单例模式

     */

    private static PersonFactory personFactory = null;

    private PersonFactory(){}

    public static PersonFactory getInstance(){

        if(personFactory==null){

            personFactory = new PersonFactory();

        }

        return personFactory;

    }

    /**

     * 存储person的map

     */

    private static Map<String, Person>personProvider = new HashMap<String, Person>();

    static{

        Person person = new Person();

        person.setId("111");

        person.setName("小敏");

        person.setBirthday("1988-03-21");

        personProvider.put("111", person);

        Person person2 = new Person();

        person2.setId("222");

        person2.setName("小丰");

        person2.setBirthday("1988-04-22");

        personProvider.put("222", person2);

    }

    /**

     * 根据id获取对应的person

     * @param id

     * @return

     */

    public Person getPersonById(String id){

        return personProvider.get(id);

    }

    /**

     * 添加对应的person到map中

     * @param person

     */

    public void addPerson(Person person){

        personProvider.put(person.getId(), person);

    }

    /**

     * 删除对应的person

     * @param id

     */

    public void deletePerson(String id){

        personProvider.remove(id);

    }

    /**

     * 获取所有的person

     * @return

     */

    public List<Person>getAllPerson(){

        List<Person> persons = new ArrayList<Person>();

        Set<String> keys = personProvider.keySet();

        for(String key:keys){

            persons.add(personProvider.get(key));

        }

        return persons;

    }

}

第三步，创建personResource，并实现相关person的增、删、改操作

package sample.hello.resources;

import javax.ws.rs.Consumes;

import javax.ws.rs.DELETE;

import javax.ws.rs.GET;

import javax.ws.rs.PUT;

import javax.ws.rs.Produces;

import javax.ws.rs.core.Context;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.Request;

import javax.ws.rs.core.Response;

import javax.ws.rs.core.UriInfo;

import javax.xml.bind.JAXBElement;

import sample.hello.resources.bean.Person;

import sample.hello.resources.bean.PersonFactory;

public class PersonResource {

    @Context

    UriInfo uriInfo;

    @Context

    Request request;

    String id;

    public PersonResource(UriInfo uriInfo, Request request, String id) {

        this.uriInfo = uriInfo;

        this.request = request;

        this.id = id;

    }

    @GET

    @Produces({MediaType.APPLICATION_XML,MediaType.APPLICATION_JSON})

    public Person getPerson(){

        Person person = PersonFactory.getInstance().getPersonById(id);

        if(person==null){

            throw new RuntimeException("查到不对id="+id+"的person");

        }

        return person;

    }

    @GET

    @Produces({MediaType.TEXT_XML})

    public Person getPersonXML(){

        Person person = PersonFactory.getInstance().getPersonById(id);

        if(person==null){

            throw new RuntimeException("查到不对id="+id+"的person");

        }

        return person;

    }

    @PUT

    @Consumes(MediaType.APPLICATION_XML)

    public Response addPerson(JAXBElement<Person>person){

        Person per = person.getValue();

        return putAndGetResponse(per);

    }

    @DELETE

    public void deletePerson(){

        Person person = PersonFactory.getInstance().getPersonById(id);

        if(person==null){

            throw new RuntimeException("Delete: person with " + id +  " not found");

        }else{

            PersonFactory.getInstance().deletePerson(id);

        }

    }

    private Response putAndGetResponse(Person person){

        Response res;

        if(PersonFactory.getInstance().getPersonById(person.getId())!=null){

            res = Response.noContent().build();

        }else{

            res = Response.created(uriInfo.getAbsolutePath()).build();

        }

        PersonFactory.getInstance().addPerson(person);

        return res;

    }

}

第四步，实现personsResource，实现批量查看，查看数量等操作

package sample.hello.resources;

import java.io.IOException;

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.Context;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.Request;

import javax.ws.rs.core.UriInfo;

import javax.servlet.http.HttpServletResponse;

import sample.hello.resources.bean.Person;

import sample.hello.resources.bean.PersonFactory;

@Path("/persons")

public class PersonsResource {

    @Context

    UriInfo uriInfo;

    @Context

    Request request;

    @GET

    @Produces(MediaType.TEXT_XML)

    public List<Person> getPersonBrowser() {

        List<Person> persons = PersonFactory.getInstance().getAllPerson();

        return persons;

    }

    @GET

    @Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })

    public List<Person> getPersons() {

        List<Person> persons = PersonFactory.getInstance().getAllPerson();

        return persons;

    }

    @GET

    @Path("count")

    @Produces(MediaType.TEXT_PLAIN)

    public String getCount() {

        int count = PersonFactory.getInstance().getAllPerson().size();

        return String.valueOf(count);

    }

    @POST

    @Produces(MediaType.TEXT_HTML)

    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)

      public void newPerson(@FormParam("id") String id,

          @FormParam("name") String name,

          @FormParam("birthday") String birthday,

          @Context HttpServletResponse servletResponse) throws IOException {

        Person person = new Person(id,name,birthday);

        PersonFactory.getInstance().addPerson(person);

        servletResponse.sendRedirect("../create_person.html");

      }

     @Path("{person}")

      public PersonResource getPerson(@PathParam("person") String id) {

        return new PersonResource(uriInfo, request, id);

      }

}

创建一个html文件，create_person.html，用户返回html格式数据

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Form to create a new resource</title>

</head>

<body>

<form action="../de.vogella.jersey.todo/rest/todos" method="POST">

  <label for="id">ID</label>

  <input name="id" />

  <br/>

  <label for="name">Summary</label>

  <input name="name" />

  <br/>

  "birthday":

  <TEXTAREA NAME="birthday" COLS=40 ROWS=6></TEXTAREA>

  <br/>

  <input type="submit" value="Submit" />

  </form>

</body>

</html>

至此，服务端代码完毕。

最后，编写客户端程序，验证相关的功能，代码如下：

package sample.hello.resources.client;

import java.net.URI;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.UriBuilder;

import sample.hello.resources.bean.Person;

import com.sun.jersey.api.client.Client;

import com.sun.jersey.api.client.ClientResponse;

import com.sun.jersey.api.client.WebResource;

import com.sun.jersey.api.client.config.ClientConfig;

import com.sun.jersey.api.client.config.DefaultClientConfig;

import com.sun.jersey.api.representation.Form;

public class PersonsTest {

    public static void main(String[] args) {

        ClientConfig config = new DefaultClientConfig();

        Client client = Client.create(config);

        WebResource service = client.resource(getBaseURI());

        Person person = new Person("333","小杜","1988-09-25");

        ClientResponse response = service.path("rest").path("persons").path(person.getId()).accept(MediaType.APPLICATION_XML).put(ClientResponse.class,person);

        System.out.println(response.getStatus());

        System.out.println( service.path("rest").path("persons").accept(MediaType.TEXT_XML).get(String.class));

        System.out.println( service.path("rest").path("persons").accept(MediaType.APPLICATION_JSON).get(String.class));

        System.out.println( service.path("rest").path("persons").accept(MediaType.APPLICATION_XML).get(String.class));

        System.out.println(service.path("rest").path("persons/111").accept(MediaType.APPLICATION_XML).get(String.class));

        service.path("rest").path("persons/111").delete();

        System.out.println(service.path("rest").path("persons").accept(MediaType.APPLICATION_XML).get(String.class));

        Form form = new Form();

        form.add("id", "444");

        form.add("name", "小飞");

        form.add("birthday", "1987-01-03");

        response = service.path("rest").path("persons").type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class,form);

        System.out.println("Form response " + response.getEntity(String.class));

        System.out.println(service.path("rest").path("persons").accept(MediaType.APPLICATION_XML).get(String.class));

    }

    private static URI getBaseURI(){

        return UriBuilder.fromUri("http://localhost:8080/Restfull").build();

    }

}

运行结果如下图所示：

至此，restful完整的CRUD操作，就算完成。

源码：http://pan.baidu.com/s/1kUAVSbX

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