Руководство по JavaLite - Создание приложения RESTful CRUD

<dependency>
    <groupId>org.javalite</groupId>
    <artifactId>activeweb</artifactId>
    <version>1.15</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.45</version>
</dependency>

<plugin>
    <groupId>org.javalite</groupId>
    <artifactId>activejdbc-instrumentation</artifactId>
    <version>1.4.13</version>
    <executions>
        <execution>
            <phase>process-classes</phase>
            <goals>
                <goal>instrument</goal>
            </goals>
        </execution>
    </executions>
</plugin>

@RESTful
public class ProductsController extends AppController {

    public void index() {
       //...
    }

}

http://<host>:<port>/products

@RESTful
public class ProductsController extends AppController {

    public void index() {
       //code to get all products
    }

    public void create() {
       //code to create a new product
    }

    public void update() {
       //code to update an existing product
    }

    public void show() {
       //code to find one product
    }

    public void destroy() {
       //code to remove an existing product
    }
}

src
 |----main
       |----java.app
       |     |----config
       |     |----controllers
       |     |----models
       |----resources
       |----webapp
             |----WEB-INF
             |----views

public class DbConfig extends AbstractDBConfig {
    @Override
    public void init(AppContext appContext) {
        this.configFile("/database.properties");
    }
}

development.driver=com.mysql.jdbc.Driver
development.username=user
development.password=password
development.url=jdbc:mysql://localhost/dbname

public class AppControllerConfig extends AbstractControllerConfig {

    @Override
    public void init(AppContext appContext) {
        add(new DBConnectionFilter()).to(ProductsController.class);
    }
}

public class AppBootstrap extends Bootstrap {
    public void init(AppContext context) {}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns=...>

    <filter>
        <filter-name>dispatcher</filter-name>
        <filter-class>org.javalite.activeweb.RequestDispatcher</filter-class>
        <init-param>
            <param-name>exclusions</param-name>
            <param-value>css,images,js,ico</param-value>
        </init-param>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>dispatcher</filter-name>
        <url-pattern>/** </url-pattern>
    </filter-mapping>

</web-app>

@RESTful
public class ProductsController extends AppController {

    private ObjectMapper mapper = new ObjectMapper();

    public void index() {
        List<Product> products = Product.findAll();
       //...
    }

    public void create() {
        Map payload = mapper.readValue(getRequestString(), Map.class);
        Product p = new Product();
        p.fromMap(payload);
        p.saveIt();
       //...
    }

    public void update() {
        Map payload = mapper.readValue(getRequestString(), Map.class);
        String id = getId();
        Product p = Product.findById(id);
        p.fromMap(payload);
        p.saveIt();
       //...
    }

    public void show() {
        String id = getId();
        Product p = Product.findById(id);
       //...
    }

    public void destroy() {
        String id = getId();
        Product p = Product.findById(id);
        p.delete();
       //...
    }
}

{
    "id" : ${product.id},
    "name" : "${product.name}"
}

----[<@render partial="product" collection=products/>]----

@RESTful
public class ProductsController extends AppController {

    public void index() {
        List<Product> products = Product.findAll();
        view("products", products);
        render();
    }

    public void show() {
        String id = getId();
        Product p = Product.findById(id);
        view("product", p);
        render("__product");
    }
}

{
    "message" : "${message}",
    "code" : ${code}
}

view("message", "There was an error.", "code", 200);
render("message");

@RESTful
public class ProductsController extends AppController {

    private ObjectMapper mapper = new ObjectMapper();

    public void index() {
        view("products", Product.findAll());
        render().contentType("application/json");
    }

    public void create() {
        Map payload = mapper.readValue(getRequestString(), Map.class);
        Product p = new Product();
        p.fromMap(payload);
        p.saveIt();
        view("message", "Successfully saved product id " + p.get("id"), "code", 200);
        render("message");
    }

    public void update() {
        Map payload = mapper.readValue(getRequestString(), Map.class);
        String id = getId();
        Product p = Product.findById(id);
        if (p == null) {
            view("message", "Product id " + id + " not found.", "code", 200);
            render("message");
            return;
        }
        p.fromMap(payload);
        p.saveIt();
        view("message", "Successfully updated product id " + id, "code", 200);
        render("message");
    }

    public void show() {
        String id = getId();
        Product p = Product.findById(id);
        if (p == null) {
            view("message", "Product id " + id + " not found.", "code", 200);
            render("message");
            return;
        }
        view("product", p);
        render("__product");
    }

    public void destroy() {
        String id = getId();
        Product p = Product.findById(id);
        if (p == null) {
            view("message", "Product id " + id + " not found.", "code", 200);
            render("message");
            return;
        }
        p.delete();
        view("message", "Successfully deleted product id " + id, "code", 200);
        render("message");
    }

    @Override
    protected String getContentType() {
        return "application/json";
    }

    @Override
    protected String getLayout() {
        return null;
    }
}

<plugin>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <version>9.4.8.v20171121</version>
</plugin>

mvn jetty:run

$ curl -X POST http://localhost:8080/products
  -H 'content-type: application/json'
  -d '{"name":"Water"}'
{
    "message" : "Successfully saved product id 1",
    "code" : 200
}

$ curl -X POST http://localhost:8080/products
  -H 'content-type: application/json'
  -d '{"name":"Bread"}'
{
    "message" : "Successfully saved product id 2",
    "code" : 200
}

$ curl -X GET http://localhost:8080/products[    {
        "id" : 1,
        "name" : "Water"
    },
    {
        "id" : 2,
        "name" : "Bread"
    }]----

.. обновить один из них:

[source,bash,gutter:,true]

... читать тот, который мы только что обновили:

[source,bash,gutter:,true]

Наконец, мы можем удалить один:

[source,bash,gutter:,true]

[[conclusions]]

===  **  9. Заключение**

JavaLite имеет множество инструментов, которые помогут разработчикам **  запустить приложение в считанные минуты ** . Однако, в то время как основанные на соглашениях результаты приводят к более чистому и простому коду, требуется некоторое время, чтобы понять наименование и расположение классов, пакетов и файлов.

Это было только знакомство с ActiveWeb и ActiveJDBC, вы можете найти дополнительную документацию на их http://javalite.io[веб-сайте]и найти приложение для наших продуктов в https://github.com/eugenp/tutorials/tree/master/java- lite[проект Github].