restfull环境搭建-helloword（三）

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