Restlet实战（六）－正确设计资源

在上篇文章的末尾，我提到资源的设计有一点问题，增加客户的功能应该放到Customers resource而不是Customer Resource。本文首先会改正这个问题。

 

首先把创建Customer的代码从Customer Resource移到Customers Resource，另外创建一个查询所有customer的get方法，代码如下：

 

public class CustomersResource extends Resource {
	private CustomerDAO customerDAO;
	
	@Override
	public void init(Context context, Request request, Response response) {
		super.init(context, request, response);
	}
	
	public CustomersResource(){
		getVariants().add(new Variant(MediaType.TEXT_PLAIN)); 
	}
	
	public CustomersResource(Context context, Request request, Response response) {
		super(context, request, response);
		
		getVariants().add(new Variant(MediaType.TEXT_PLAIN));
	}	
	

	@Override
	public Representation represent(Variant variant) {
		List<Customer> list = customerDAO.getAllCustomers();
		Representation representation = new StringRepresentation("", MediaType.TEXT_PLAIN);
		return representation;
	}
	
	@Override
	public boolean allowPut() {
		return true;
	}
	
	@Override
    public void storeRepresentation(Representation entity) throws ResourceException {
		Form form = new Form(entity);
		Customer customer = new Customer();
		customer.setName(form.getFirstValue("name"));
		customer.setAddress(form.getFirstValue("address"));
		customer.setRemarks("This is an example which receives request with put method and save data");
		
		customerDAO.saveCustomer(customer);
	}

	public void setCustomerDAO(CustomerDAO customerDAO) {
		this.customerDAO = customerDAO;
	}
	
}

 

 在Spring配置文件定义一个Customers resource bean，并修改URL映射部分：

	<bean id="restRoute" class="org.restlet.ext.spring.SpringRouter">
		<property name="attachments">
			<map>
				<entry key="/customers">
					<bean class="org.restlet.ext.spring.SpringFinder">
						<lookup-method name="createResource" bean="customersResource" />
					</bean>
				</entry>
				<entry key="/customers/{customerId}">
					<bean class="org.restlet.ext.spring.SpringFinder">
						<lookup-method name="createResource" bean="customerResource" />
					</bean>
				</entry>
			</map>
		</property>
	</bean>

 

	<bean id="customersResource" class="com.infosys.restlet.resource.CustomersResource" scope="prototype">
		<property name="customerDAO" ref="customerDAO" />
	</bean>

 

 在CustomerResourceTest中修改测试方法：

	public static void testStoreRepresentation(){
		Client client = new Client(Protocol.HTTP);
		Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers");
		Form form = new Form();
		form.add("name", "Ajax");
		form.add("description", "test store presentation");
		Representation rep = form.getWebRepresentation();
		Response response = client.put(itemsUri, rep);
		assertTrue(response.getStatus().isSuccess());
	}