java开发——Jersey框架搭建Restful Java Web Service

第一步：下载所需要的架包，下载位置：链接: https://pan.baidu.com/s/1-_fgFqlSxjdcYS_YXOJh9g 密码: qaax

第二步：创建动态网站项目，引入架包，如下图所示：

第三步：编写代码：

package sample.hello.resources;

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletResponse;
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.Response;
import javax.ws.rs.core.UriInfo;

import sample.hello.bean.Address;
import sample.hello.bean.Contact;
import sample.hello.storage.ContactStore;


@Path("/contacts")
public class ContactsResource {
	
	@Context
	UriInfo uriInfo;
	@Context
	Request request;

	@GET
	@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
	public List<Contact> getContacts() {
		List<Contact> contacts = new ArrayList<Contact>();
		contacts.addAll( ContactStore.getStore().values() );
		return contacts;
	}
	
	@GET
	@Path("count")
	@Produces(MediaType.TEXT_PLAIN)
	public String getCount() {
		int count = ContactStore.getStore().size();
		return String.valueOf(count);
	}
	
	@POST
	@Produces(MediaType.TEXT_HTML)
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	public void newContact(
			@FormParam("id") String id,
			@FormParam("name") String name,
			@Context HttpServletResponse servletResponse
	) throws IOException {
		Contact c = new Contact(id,name,new ArrayList<Address>());
		ContactStore.getStore().put(id, c);
		
		URI uri = uriInfo.getAbsolutePathBuilder().path(id).build();
		Response.created(uri).build();
		
		servletResponse.sendRedirect("../pages/new_contact.html");
	}
	
	@Path("{contact}")
	public ContactResource getContact(
			@PathParam("contact") String contact) {
		return new ContactResource(uriInfo, request, contact);
	}
	
}

package sample.hello.resources;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/hello")
public class HelloResource {
	@GET
	@Produces(MediaType.TEXT_PLAIN)
	public String sayHello() {
		return "Hello Jersey";
	}
}

package sample.hello.resources;

import java.util.ArrayList;
import java.util.Map;

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.HttpHeaders;
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.bean.Address;
import sample.hello.bean.Contact;
import sample.hello.storage.ContactStore;
import sample.hello.util.ParamUtil;

import com.sun.jersey.api.NotFoundException;

//https://www.ibm.com/developerworks/cn/web/wa-aj-tomcat/#artdownload


public class ContactResource {
	@Context
	UriInfo uriInfo;
	@Context
	Request request;
	String contact;

	public ContactResource(UriInfo uriInfo, Request request, String contact) {
		this.uriInfo = uriInfo;
		this.request = request;
		this.contact = contact;
	}

	@GET
	@Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
	public Contact getContact() {
		Contact cont = ContactStore.getStore().get(contact);
		if (cont == null)
			throw new NotFoundException("No such Contact.");
		return cont;
	}

	@PUT
	@Consumes(MediaType.APPLICATION_XML)
	public Response putContact(JAXBElement<Contact> jaxbContact) {
		Contact c = jaxbContact.getValue();
		return putAndGetResponse(c);
	}

	@PUT
	public Response putContact(@Context HttpHeaders herders, byte[] in) {
		Map<String, String> params = ParamUtil.parse(new String(in));
		Contact c = new Contact(params.get("id"), params.get("name"), new ArrayList<Address>());
		return putAndGetResponse(c);
	}

	private Response putAndGetResponse(Contact c) {
		Response res;
		if (ContactStore.getStore().containsKey(c.getId())) {
			res = Response.noContent().build();
		} else {
			res = Response.created(uriInfo.getAbsolutePath()).build();
		}
		ContactStore.getStore().put(c.getId(), c);
		return res;
	}

	@DELETE
	public void deleteContact() {
		Contact c = ContactStore.getStore().remove(contact);
		if (c == null)
			throw new NotFoundException("No such Contact.");
	}
}

package sample.hello.bean;

import java.util.List;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Contact {
	private String id;
	private String name;
	private List<Address> addresses;
	
	public Contact() {}
	
	public Contact(String id, String name, List<Address> addresses) {
		this.id = id;
		this.name = name;
		this.addresses = addresses;
	}

	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;
	}

	@XmlElement(name="address")
	public List<Address> getAddresses() {
		return addresses;
	}

	public void setAddresses(List<Address> addresses) {
		this.addresses = addresses;
	}
	
}

package sample.hello.bean;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Address {
	private String city;
	private String street;
	
	public Address() {}
	
	public Address(String city, String street) {
		this.city = city;
		this.street = street;
	}

	public String getCity() {
		return city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	public String getStreet() {
		return street;
	}

	public void setStreet(String street) {
		this.street = street;
	}
	
}

package sample.hello.storage;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import sample.hello.bean.Address;
import sample.hello.bean.Contact;

public class ContactStore {
	private static Map<String, Contact> store;
	private static ContactStore instance = null;

	private ContactStore() {
		store = new HashMap<String, Contact>();
		initOneContact();
	}

	public static Map<String, Contact> getStore() {
		if (instance == null) {
			instance = new ContactStore();
		}
		return store;
	}

	private static void initOneContact() {
		Address[] addrs = { new Address("Shanghai", "Long Hua Street"), new Address("Shanghai", "Dong Quan Street") };
		Contact cHuang = new Contact("huangyim", "Huang Yi Ming", Arrays.asList(addrs));
		store.put(cHuang.getId(), cHuang);
	}
}

package sample.hello.util;

import java.util.HashMap;
import java.util.Map;

public class ParamUtil {
	public static Map<String,String> parse(String paramString) {
		Map<String,String> params = new HashMap<String,String>();
		String[] paramPairs = paramString.split("&");
		for(String param : paramPairs) {
			String[] key_value = param.split("=");
			params.put(key_value[0], key_value[1]);
		}
		return params;
	}
}

package sample.hello.client;

import java.util.Arrays;
import java.util.List;

import javax.ws.rs.core.MediaType;
import javax.xml.bind.JAXBElement;

import sample.hello.bean.Address;
import sample.hello.bean.Contact;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.GenericType;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.representation.Form;

public class ContactClient {
	
	public static void main(String[] args) {
		Client c = Client.create();
		//WebResource r = c.resource("http://localhost:8080/Jersey/rest/contacts");
		WebResource r = c.resource("http://localhost/samplehello/rest/hello");
		System.out.println("===== Get huangyim =====");
		getOneContact(r, "huangyim");
		
		System.out.println("===== Create foo =====");
		postForm(r, "foo", "bar");
		
		Address[] addrs = {
			new Address("Shanghai", "Ke Yuan Street")
		};
		Contact cnt = new Contact("guoqing", "Guo Qing", Arrays.asList(addrs));
		
		System.out.println("===== Create guoqing =====");
		putOneContact(r, cnt);
		
		System.out.println("===== All Contacts =====");
		getContacts(r);
		
		System.out.println("===== Delete foo =====");
		deleteOneContact(r, "foo");
		
		System.out.println("===== All Contacts =====");
		getContacts(r);
	}
	
	public static void getContacts(WebResource r) {
		
		// 1, get response as plain text
		String jsonRes = r.accept(MediaType.APPLICATION_JSON).get(String.class);
		System.out.println(jsonRes);
		
		String xmlRes = r.accept(MediaType.APPLICATION_XML).get(String.class);
		System.out.println(xmlRes);
		
		// 2, get response and headers etc, wrapped in ClientResponse
		ClientResponse response = r.get(ClientResponse.class);
		System.out.println( response.getStatus() );
		System.out.println( response.getHeaders().get("Content-Type") );
		String entity = response.getEntity(String.class);
		System.out.println(entity);
		
		// 3, get JAXB response
		GenericType<List<Contact>> genericType = new GenericType<List<Contact>>() {};
		List<Contact> contacts = r.accept(MediaType.APPLICATION_XML).get(genericType);
		System.out.println("No. of Contacts: " + contacts.size());
		Contact contact = contacts.get(0);
		System.out.println(contact.getId() + ": " + contact.getName());
	}
	
	public static void getOneContact(WebResource r, String id) {
		GenericType<JAXBElement<Contact>> generic = new GenericType<JAXBElement<Contact>>() {};
		JAXBElement<Contact> jaxbContact = r.path(id).accept(MediaType.APPLICATION_XML).get(generic);
		Contact contact = jaxbContact.getValue();
		System.out.println(contact.getId() + ": " + contact.getName());
	}
	
	public static void postForm(WebResource r, String id, String name) {
		Form form = new Form();
		form.add("id", id);
		form.add("name", name);
		ClientResponse response = r.type(MediaType.APPLICATION_FORM_URLENCODED)
								   .post(ClientResponse.class, form);
		System.out.println(response.getEntity(String.class));
	}
	
	public static void putOneContact(WebResource r, Contact c) {
		ClientResponse response = r.path(c.getId()).accept(MediaType.APPLICATION_XML)
								   .put(ClientResponse.class, c);
		System.out.println(response.getStatus());
	}
	
	public static void deleteOneContact(WebResource r, String id) {
		ClientResponse response = r.path(id).delete(ClientResponse.class);
		System.out.println(response.getStatus());
	}
}

第四步：测试结果，上面的代码调试通过之后，用tomcat部署项目，项目部署完成之后使用postman或者其他测试工具都可以，本人使用postman测试，例如我们要测试sayHello()这个接口，请求方式:get，输入请求地址：http://localhost/samplehello/rest/hello,点击发送：Send，如下图结果

第五步：项目下载地址：链接: https://pan.baidu.com/s/1yc-rV5WEAKoEFztdEcalhQ 密码: rcy9

java开发——Jersey框架搭建Restful Java Web Service

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