Spring Data Injection Demo

Spring Data Injection Demo using annotations
2017-05-22 17:35:18 +05:30
parent faa15d50ce
commit 140de5b0b2
10 changed files with 245 additions and 0 deletions
@@ -0,0 +1,12 @@
+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringDataInjectionDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringDataInjectionDemoApplication.class, args);
+	}
+}
@@ -0,0 +1,45 @@
+package com.baeldung.didemo.controller;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.didemo.model.Order;
+import com.baeldung.didemo.service.CustomerServiceConstructorDI;
+import com.baeldung.didemo.service.CustomerServiceConstructorWithoutSpringDI;
+import com.baeldung.didemo.service.CustomerServiceFieldDI;
+import com.baeldung.didemo.service.CustomerServiceSetterDI;
+import com.baeldung.didemo.service.OrderService;
+
+@RestController
+@RequestMapping(value = "/orders")
+public class OrderController {
+
+    @Autowired
+    CustomerServiceConstructorDI constructorDI;
+
+    @Autowired
+    CustomerServiceFieldDI fieldDI;
+
+    @Autowired
+    CustomerServiceSetterDI setterDI;
+
+    @RequestMapping(method = RequestMethod.GET)
+    public List<Order> getOrdersFieldDI(@RequestParam(required = false) String dIMethod) {
+        if ("setter".equals(dIMethod)) {
+            return setterDI.getCustomerOrders(1l);
+        } else if ("constructor".equals(dIMethod)) {
+            return constructorDI.getCustomerOrders(1l);
+        } else if ("field".equals(dIMethod)) {
+            return fieldDI.getCustomerOrders(1l);
+        } else {
+            OrderService orderSvc = new OrderService();
+            CustomerServiceConstructorWithoutSpringDI customerSvc = new CustomerServiceConstructorWithoutSpringDI(orderSvc);
+            return customerSvc.getCustomerOrders(1l);
+        }
+    }
+}
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+package com.baeldung.didemo.model;
+
+public class Order {
+
+    private Integer id;
+    private String item;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getItem() {
+        return item;
+    }
+
+    public void setItem(String item) {
+        this.item = item;
+    }
+
+    // other order properties..
+
+}
@@ -0,0 +1,25 @@
+package com.baeldung.didemo.service;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.didemo.model.Order;
+
+@Service
+public class CustomerServiceConstructorDI {
+
+    OrderService orderService;
+
+    @Autowired
+    public CustomerServiceConstructorDI(OrderService orderService) {
+        super();
+        this.orderService = orderService;
+    }
+
+    public List<Order> getCustomerOrders(Long customerId) {
+        return orderService.getOrdersForCustomer(customerId);
+    }
+
+}
@@ -0,0 +1,20 @@
+package com.baeldung.didemo.service;
+
+import java.util.List;
+
+import com.baeldung.didemo.model.Order;
+
+public class CustomerServiceConstructorWithoutSpringDI {
+
+    OrderService orderService;
+
+    public CustomerServiceConstructorWithoutSpringDI(OrderService orderService) {
+        super();
+        this.orderService = orderService;
+    }
+
+    public List<Order> getCustomerOrders(Long customerId) {
+        return orderService.getOrdersForCustomer(customerId);
+    }
+
+}
@@ -0,0 +1,19 @@
+package com.baeldung.didemo.service;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.didemo.model.Order;
+
+@Service
+public class CustomerServiceFieldDI {
+
+    @Autowired
+    OrderService orderService;
+    
+    public List<Order> getCustomerOrders(Long customerId) {
+        return orderService.getOrdersForCustomer(customerId);
+    }
+}
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+package com.baeldung.didemo.service;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.didemo.model.Order;
+
+@Service
+public class CustomerServiceSetterDI {
+
+    OrderService orderService;
+
+    public List<Order> getCustomerOrders(Long customerId) {
+        return orderService.getOrdersForCustomer(customerId);
+    }
+
+    @Autowired
+    public void setOrderService(OrderService orderService) {
+        this.orderService = orderService;
+    }
+
+}
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+package com.baeldung.didemo.service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+
+import com.baeldung.didemo.model.Order;
+
+@Service
+public class OrderService {
+
+    public List<Order> getOrdersForCustomer(Long id) {
+        List<Order> orders = new ArrayList<Order>();
+        
+        Order order1 = new Order();
+        order1.setId(1);
+        order1.setItem("Pizza");
+        
+        Order order2 = new Order();
+        order2.setId(1);
+        order2.setItem("Garlic Bread");
+        
+        orders.add(order1);
+        orders.add(order2);
+        
+        return orders;
+    }
+    
+}