Restlet实战（五）创建对应PUT、POST、DELETE的方法

之前的系列文章，为了测试一些功能点，所以只选择get这种情况，本文将添加另外三种主要的方法POST, PUT, DELETE.对应我们的业务方法是新增、修改、删除。此文对上篇文章示例代码进行修改。

 

首先在CustomerResource里加入代码：

 

@Override
public boolean allowPut() {
    return true;
}

@Override
public boolean allowPost() {
    return true;
}

@Override
public boolean allowDelete() {
    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.setRemarks("This is an example which receives request with put method and save data");

    customerDAO.saveCustomer(customer);
}

@Override
public void acceptRepresentation(Representation entity) throws ResourceException {
    Form form = new Form(entity);
    Customer customer = new Customer();
    customer.setId(customerId);
    customer.setName(form.getFirstValue("name"));
    customer.setRemarks("This is an example which receives request with post method and update data");

    customerDAO.updateCustomer(customer);
}

@Override
public void removeRepresentations() throws ResourceException {
    customerDAO.deleteCustomer(customerId);
}

 

 

这里稍微说明一下，如果你想增加put方法，则需要override方法allowPut，并使之返回值为true，同样，对post，delete是一样的，如果你觉得指定三个方法太多，那么你可以用下面的代码来替代上面三个方法：

 

@Override
public boolean isModifiable() {
        return true;
}

 

在数据层的接口类和实现类里面加入相应的调用代码：

 

public interface CustomerDAO {
    public String getCustomerById(String id);
    public void saveCustomer(Customer customer);
    public void updateCustomer(Customer customer);
    public void deleteCustomer(String id);
}

 

public class CustomerDAOImpl implements CustomerDAO{
    Logger logger = Logger.getLogger(this.getClass().getName());

    public String getCustomerById(String id){
        //get other information through id such as name, no, address etc.
        String name = "ajax";
        String address=  "Shanghai";
        return "The customer name is " + name + " and he is from " + address;
    }

    public void saveCustomer(Customer customer){
        //save the customer data into db
        System.out.println("save the infomation of customer into database");
    }

    public void updateCustomer(Customer customer){
        System.out.println("update the customer whose id is " + customer.getId());
    }

    public void deleteCustomer(String id){
        System.out.println("delete the customer whose id is " + id);
    }

}

 

 

为了封装传递的参数，创建一个Customer BO：

 

public class Customer implements Serializable{
    private static final long serialVersionUID = 4021273041291957638L;
    private String id;
    private String name;
    private String phone;
    private String address;
    private String email;
    private String remarks;

    //getter and setter method
}

 

下面使用Restlet提供的客户端来测试上述代码：

 

public class CustomerResourceTest extends TestCase{

    public static void testStoreRepresentation(){
        Client client = new Client(Protocol.HTTP);
        Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers/1");
        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());
    }

    public static void testAcceptRepresentation(){
        Client client = new Client(Protocol.HTTP);
        Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers/1");
        Form form = new Form();
        form.add("name", "Ajax_cn");
        form.add("description", "test update presentation");
        Representation rep = form.getWebRepresentation();
        Response response = client.post(itemsUri, rep);
        assertTrue(response.getStatus().isSuccess());
    }

    public static void testDeleteRepresentation(){
        Client client = new Client(Protocol.HTTP);
        Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers/1");

        Response response = client.delete(itemsUri);
        assertTrue(response.getStatus().isSuccess());
    }
}

 

这里唯一想说的是看测试第一个方法里面的URL的定义：

Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers/1");

按照资源的划分，这样的URL是不合适的，正确的URL应该是：

Reference itemsUri = new Reference("http://localhost:8080/restlet/resources/customers");相应的method是PUT。如果不是很理解，看这个系列中的一篇