JAX-RS API using Jersey [BAEL-558] (#956)

* WatchService vs. Apache Commons IO Mnitoring * Indentation fixed * Indentation fixed * JAX-RS API using Jersey [BAEL-558] * JAX-RS API using Jersey [BAEL-558] * Modifications made to remove xml * applicationContext.xml removed * All try catch moved to ExceptionMapper * fixes * review comments incorporated * module renamed
2017-01-12 19:25:18 +05:30
parent a5978cf259
commit 06ceb4d87c
16 changed files with 589 additions and 0 deletions
@@ -0,0 +1,22 @@
+package com.baeldung.server.config;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+
+@Order(Ordered.HIGHEST_PRECEDENCE)
+public class ApplicationInitializer implements WebApplicationInitializer {
+
+    @Override
+    public void onStartup(ServletContext servletContext) throws ServletException {
+        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
+        servletContext.addListener(new ContextLoaderListener(context));
+        servletContext.setInitParameter("contextConfigLocation", "com.baeldung.server");
+    }
+
+}
@@ -0,0 +1,19 @@
+package com.baeldung.server.config;
+
+import javax.ws.rs.ApplicationPath;
+import javax.ws.rs.core.Application;
+
+import com.baeldung.server.exception.AlreadyExistsExceptionHandler;
+import com.baeldung.server.exception.NotFoundExceptionHandler;
+import com.baeldung.server.rest.EmployeeResource;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+@ApplicationPath("/resources")
+public class RestConfig extends Application {
+    public Set<Class<?>> getClasses() {
+        return new HashSet<Class<?>>(Arrays.asList(EmployeeResource.class, NotFoundExceptionHandler.class, AlreadyExistsExceptionHandler.class));
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.server.exception;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+
+@Provider
+public class AlreadyExistsExceptionHandler implements ExceptionMapper<EmployeeAlreadyExists> {
+    public Response toResponse(EmployeeAlreadyExists ex) {
+        return Response.status(Response.Status.CONFLICT.getStatusCode()).build();
+    }
+}
@@ -0,0 +1,5 @@
+package com.baeldung.server.exception;
+
+public class EmployeeAlreadyExists extends RuntimeException {
+
+}
@@ -0,0 +1,5 @@
+package com.baeldung.server.exception;
+
+public class EmployeeNotFound extends RuntimeException {
+
+}
@@ -0,0 +1,12 @@
+package com.baeldung.server.exception;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+
+@Provider
+public class NotFoundExceptionHandler implements ExceptionMapper<EmployeeNotFound> {
+    public Response toResponse(EmployeeNotFound ex) {
+        return Response.status(Response.Status.NOT_FOUND).build();
+    }
+}
@@ -0,0 +1,34 @@
+package com.baeldung.server.model;
+
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
+public class Employee {
+    private int id;
+    private String firstName;
+
+    public Employee() {
+
+    }
+
+    public Employee(int id, String firstName) {
+        this.id = id;
+        this.firstName = firstName;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+}
@@ -0,0 +1,18 @@
+package com.baeldung.server.repository;
+
+import java.util.List;
+
+import com.baeldung.server.model.Employee;
+
+public interface EmployeeRepository {
+
+    public List<Employee> getAllEmployees();
+
+    public Employee getEmployee(int id);
+
+    public void updateEmployee(Employee employee, int id);
+
+    public void deleteEmployee(int id);
+
+    public void addEmployee(Employee employee);
+}
@@ -0,0 +1,65 @@
+package com.baeldung.server.repository;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.stereotype.Component;
+
+import com.baeldung.server.exception.EmployeeAlreadyExists;
+import com.baeldung.server.exception.EmployeeNotFound;
+import com.baeldung.server.model.Employee;
+
+@Component
+public class EmployeeRepositoryImpl implements EmployeeRepository {
+    private List<Employee> employeeList;
+
+    public EmployeeRepositoryImpl() {
+        employeeList = new ArrayList<Employee>();
+        employeeList.add(new Employee(1, "Jane"));
+        employeeList.add(new Employee(2, "Jack"));
+        employeeList.add(new Employee(3, "George"));
+    }
+
+    public List<Employee> getAllEmployees() {
+        return employeeList;
+    }
+
+    public Employee getEmployee(int id) {
+        for (Employee emp : employeeList) {
+            if (emp.getId() == id) {
+                return emp;
+            }
+        }
+        throw new EmployeeNotFound();
+    }
+
+    public void updateEmployee(Employee employee, int id) {
+        for (Employee emp : employeeList) {
+            if (emp.getId() == id) {
+                emp.setId(employee.getId());
+                emp.setFirstName(employee.getFirstName());
+                return;
+            }
+        }
+        throw new EmployeeNotFound();
+    }
+
+    public void deleteEmployee(int id) {
+        for (Employee emp : employeeList) {
+            if (emp.getId() == id) {
+                employeeList.remove(emp);
+                return;
+            }
+        }
+        throw new EmployeeNotFound();
+    }
+
+    public void addEmployee(Employee employee) {
+        for (Employee emp : employeeList) {
+            if (emp.getId() == employee.getId()) {
+                throw new EmployeeAlreadyExists();
+            }
+        }
+        employeeList.add(employee);
+    }
+}
@@ -0,0 +1,64 @@
+package com.baeldung.server.rest;
+
+import java.util.List;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+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.Response;
+import javax.ws.rs.core.UriInfo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+import com.baeldung.server.model.Employee;
+import com.baeldung.server.repository.EmployeeRepository;
+
+@Path("/employees")
+public class EmployeeResource {
+
+    @Autowired
+    private EmployeeRepository employeeRepository;
+
+    @GET
+    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public List<Employee> getAllEmployees() {
+        return employeeRepository.getAllEmployees();
+    }
+
+    @GET
+    @Path("/{id}")
+    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Employee getEmployee(@PathParam("id") int id) {
+        return employeeRepository.getEmployee(id);
+    }
+
+    @PUT
+    @Path("/{id}")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Response updateEmployee(Employee employee, @PathParam("id") int id) {
+        employeeRepository.updateEmployee(employee, id);
+        return Response.status(Response.Status.OK.getStatusCode()).build();
+    }
+
+    @DELETE
+    @Path("/{id}")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Response deleteEmployee(@PathParam("id") int id) {
+        employeeRepository.deleteEmployee(id);
+        return Response.status(Response.Status.OK.getStatusCode()).build();
+    }
+
+    @POST
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Response addEmployee(Employee employee, @Context UriInfo uriInfo) {
+        employeeRepository.addEmployee(new Employee(employee.getId(), employee.getFirstName()));
+        return Response.status(Response.Status.CREATED.getStatusCode()).header("Location", String.format("%s/%s", uriInfo.getAbsolutePath().toString(), employee.getId())).build();
+    }
+}