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

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

spring-mvc-java-2/README.md

@@ -3,4 +3,5 @@
 - [Cache Headers in Spring MVC](https://www.baeldung.com/spring-mvc-cache-headers)
 - [Working with Date Parameters in Spring](https://www.baeldung.com/spring-date-parameters)
 - [Spring MVC @PathVariable with a dot (.) gets truncated](https://www.baeldung.com/spring-mvc-pathvariable-dot)
-- [A Quick Guide to Spring MVC Matrix Variables](https://www.baeldung.com/spring-mvc-matrix-variables)
+- [A Quick Guide to Spring MVC Matrix Variables](https://www.baeldung.com/spring-mvc-matrix-variables)
+- [Converting a Spring MultipartFile to a File](https://www.baeldung.com/converting-spring-multipartfile-to-a-file)

spring-mvc-java-2/pom.xml

@@ -31,6 +31,11 @@
             <artifactId>jackson-databind</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -49,4 +54,4 @@
     </properties>
 
 
-</project>
+</project>

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");
+    }
+}