Merge pull request #9577 from eugenp/BAEL-4088-v2

BAEL-4088 move code to spring-mvc-java-2 module

spring-mvc-java-2/src/main/resources/targetFile.tmp

@@ -0,0 +1 @@
+Hello World

spring-mvc-java-2/src/test/java/com/baeldung/multipart/file/ConvertMultipartFileUnitTest.java

@@ -0,0 +1,73 @@
+package com.baeldung.multipart.file;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.apache.commons.io.FileUtils;
+import org.junit.Test;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.web.multipart.MultipartFile;
+
+public class ConvertMultipartFileUnitTest {
+
+    /**
+     * Example of converting a {@link MultipartFile} to a {@link File} using {@link MultipartFile#getBytes()}.
+     * 
+     * @throws IOException
+     */
+    @Test
+    public void whenGetBytes_thenOK() throws IOException {
+        MultipartFile multipartFile = new MockMultipartFile("sourceFile.tmp", "Hello World".getBytes());
+
+        File file = new File("src/main/resources/targetFile.tmp");
+
+        try (OutputStream os = new FileOutputStream(file)) {
+            os.write(multipartFile.getBytes());
+        }
+
+        assertThat(FileUtils.readFileToString(new File("src/main/resources/targetFile.tmp"), "UTF-8")).isEqualTo("Hello World");
+    }
+
+    /**
+     * Example of converting a {@link MultipartFile} to a {@link File} using {@link MultipartFile#getInputStream()}.
+     * 
+     * @throws IOException
+     */
+    @Test
+    public void whenGetInputStream_thenOK() throws IOException {
+        MultipartFile multipartFile = new MockMultipartFile("sourceFile.tmp", "Hello World".getBytes());
+
+        InputStream initialStream = multipartFile.getInputStream();
+        byte[] buffer = new byte[initialStream.available()];
+        initialStream.read(buffer);
+
+        File targetFile = new File("src/main/resources/targetFile.tmp");
+
+        try (OutputStream outStream = new FileOutputStream(targetFile)) {
+            outStream.write(buffer);
+        }
+
+        assertThat(FileUtils.readFileToString(new File("src/main/resources/targetFile.tmp"), "UTF-8")).isEqualTo("Hello World");
+    }
+
+    /**
+     * Example of converting a {@link MultipartFile} to a {@link File} using {@link MultipartFile#transferTo(File)}.
+     * 
+     * @throws IOException
+     */
+    @Test
+    public void whenTransferTo_thenOK() throws IllegalStateException, IOException {
+        MultipartFile multipartFile = new MockMultipartFile("sourceFile.tmp", "Hello World".getBytes());
+
+        File file = new File("src/main/resources/targetFile.tmp");
+
+        multipartFile.transferTo(file);
+
+        assertThat(FileUtils.readFileToString(new File("src/main/resources/targetFile.tmp"), "UTF-8")).isEqualTo("Hello World");
+    }
+}