BAEL-1628 (#4354)

* Bean Object, server side and client side example for event streaming
example

* BAEL-1628

Access a File from the Classpath in a Spring Application

* inputstream retrieval added

* Removed files related to evaluation article

* + Aligning code to the article. Removed Utility methods and classes

* BAEL - 1628

* PMD fixes

* Code Review changes
Refactored : whenResourceUtils_thenReadSuccessful

spring-core/src/test/java/com/baeldung/resource/SpringResourceIntegrationTest.java

@@ -0,0 +1,101 @@
+package com.baeldung.resource;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.util.stream.Collectors;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.ApplicationContext;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+import org.springframework.util.ResourceUtils;
+
+/**
+ * Test class illustrating various methods of accessing a file from the classpath using Resource.
+ * @author tritty
+ *
+ */
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(loader = AnnotationConfigContextLoader.class)
+public class SpringResourceIntegrationTest {
+    /**
+     * Resource loader instance for lazily loading resources.
+     */
+    @Autowired
+    private ResourceLoader resourceLoader;
+
+    @Autowired
+    private ApplicationContext appContext;
+
+    /**
+     * Injecting resource
+     */
+    @Value("classpath:data/employees.dat")
+    private Resource resourceFile;
+
+    /**
+     * Data in data/employee.dat
+     */
+    private static final String EMPLOYEES_EXPECTED = "Joe Employee,Jan Employee,James T. Employee";
+
+    @Test
+    public void whenResourceLoader_thenReadSuccessful() throws IOException {
+        final Resource resource = resourceLoader.getResource("classpath:data/employees.dat");
+        final String employees = new String(Files.readAllBytes(resource.getFile()
+            .toPath()));
+        assertEquals(EMPLOYEES_EXPECTED, employees);
+    }
+
+    @Test
+    public void whenApplicationContext_thenReadSuccessful() throws IOException {
+        final Resource resource = appContext.getResource("classpath:data/employees.dat");
+        final String employees = new String(Files.readAllBytes(resource.getFile()
+            .toPath()));
+        assertEquals(EMPLOYEES_EXPECTED, employees);
+    }
+
+    @Test
+    public void whenAutowired_thenReadSuccessful() throws IOException {
+        final String employees = new String(Files.readAllBytes(resourceFile.getFile()
+            .toPath()));
+        assertEquals(EMPLOYEES_EXPECTED, employees);
+    }
+
+    @Test
+    public void whenResourceUtils_thenReadSuccessful() throws IOException {
+        final File employeeFile = ResourceUtils.getFile("classpath:data/employees.dat");
+        final String employees = new String(Files.readAllBytes(employeeFile.toPath()));
+        assertEquals(EMPLOYEES_EXPECTED, employees);
+    }
+
+    @Test
+    public void whenResourceAsStream_thenReadSuccessful() throws IOException {
+        final InputStream resource = new ClassPathResource("data/employees.dat").getInputStream();
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(resource))) {
+            final String employees = reader.lines()
+                .collect(Collectors.joining("\n"));
+            assertEquals(EMPLOYEES_EXPECTED, employees);
+        }
+    }
+
+    @Test
+    public void whenResourceAsFile_thenReadSuccessful() throws IOException {
+        final File resource = new ClassPathResource("data/employees.dat").getFile();
+        final String employees = new String(Files.readAllBytes(resource.toPath()));
+        assertEquals(EMPLOYEES_EXPECTED, employees);
+    }
+}

spring-core/src/test/resources/data/employees.dat

@@ -0,0 +1 @@
+Joe Employee,Jan Employee,James T. Employee