Introduce getContentAsByteArray()/getContentAsString() in MockHtttpSvltReq

In order to improve debugging and logging within test suites, this
commit introduces getContentAsByteArray() and getContentAsString()
methods in MockHttpServletRequest, analogous to the existing methods in
MockHttpServletResponse.

Issue: SPR-14717

spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java

@@ -371,10 +371,42 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
+	/**
+	 * Set the content of the request body as a byte array.
+	 * @see #getContentAsByteArray()
+	 * @see #getContentAsString()
+	 */
 	public void setContent(byte[] content) {
 		this.content = content;
 	}
 
+	/**
+	 * Get the content of the request body as a byte array.
+	 * @since 5.0
+	 * @see #setContent(byte[])
+	 * @see #getContentAsString()
+	 */
+	public byte[] getContentAsByteArray() {
+		return this.content;
+	}
+
+	/**
+	 * Get the content of the request body as a {@code String}, using the configured
+	 * {@linkplain #getCharacterEncoding character encoding} if present.
+	 * @since 5.0
+	 * @see #setContent(byte[])
+	 * @see #getContentAsByteArray()
+	 * @see #setCharacterEncoding(String)
+	 */
+	public String getContentAsString() throws UnsupportedEncodingException {
+		if (this.content == null) {
+			return null;
+		}
+
+		return (this.characterEncoding != null ?
+				new String(this.content, this.characterEncoding) : new String(this.content));
+	}
+
 	@Override
 	public int getContentLength() {
 		return (this.content != null ? this.content.length : -1);

spring-test/src/test/java/org/springframework/mock/web/MockHttpServletRequestTests.java

@@ -58,7 +58,7 @@ public class MockHttpServletRequestTests {
 
 
 	@Test
-	public void content() throws IOException {
+	public void setContentAndGetInputStream() throws IOException {
 		byte[] bytes = "body".getBytes(Charset.defaultCharset());
 		request.setContent(bytes);
 		assertEquals(bytes.length, request.getContentLength());
@@ -66,11 +66,43 @@ public class MockHttpServletRequestTests {
 		assertEquals("body", StreamUtils.copyToString(request.getInputStream(), Charset.defaultCharset()));
 	}
 
+	@Test
+	public void setContentAndGetContentAsByteArray() throws IOException {
+		byte[] bytes = "request body".getBytes();
+		request.setContent(bytes);
+		assertEquals(bytes.length, request.getContentLength());
+		assertNotNull(request.getContentAsByteArray());
+		assertEquals(bytes, request.getContentAsByteArray());
+	}
+
+	@Test
+	public void setContentAndGetContentAsStringWithDefaultCharacterEncoding() throws IOException {
+		String palindrome = "ablE was I ere I saw Elba";
+		byte[] bytes = palindrome.getBytes();
+		request.setContent(bytes);
+		assertEquals(bytes.length, request.getContentLength());
+		assertNotNull(request.getContentAsString());
+		assertEquals(palindrome, request.getContentAsString());
+	}
+
+	@Test
+	public void setContentAndGetContentAsStringWithExplicitCharacterEncoding() throws IOException {
+		String palindrome = "ablE was I ere I saw Elba";
+		byte[] bytes = palindrome.getBytes("UTF-16");
+		request.setCharacterEncoding("UTF-16");
+		request.setContent(bytes);
+		assertEquals(bytes.length, request.getContentLength());
+		assertNotNull(request.getContentAsString());
+		assertEquals(palindrome, request.getContentAsString());
+	}
+
 	@Test
 	public void noContent() throws IOException {
 		assertEquals(-1, request.getContentLength());
 		assertNotNull(request.getInputStream());
 		assertEquals(-1, request.getInputStream().read());
+		assertNull(request.getContentAsByteArray());
+		assertNull(request.getContentAsString());
 	}
 
 	@Test

spring-web/src/test/java/org/springframework/mock/web/test/MockHttpServletRequest.java

@@ -371,10 +371,42 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
+	/**
+	 * Set the content of the request body as a byte array.
+	 * @see #getContentAsByteArray()
+	 * @see #getContentAsString()
+	 */
 	public void setContent(byte[] content) {
 		this.content = content;
 	}
 
+	/**
+	 * Get the content of the request body as a byte array.
+	 * @since 5.0
+	 * @see #setContent(byte[])
+	 * @see #getContentAsString()
+	 */
+	public byte[] getContentAsByteArray() {
+		return this.content;
+	}
+
+	/**
+	 * Get the content of the request body as a {@code String}, using the configured
+	 * {@linkplain #getCharacterEncoding character encoding} if present.
+	 * @since 5.0
+	 * @see #setContent(byte[])
+	 * @see #getContentAsByteArray()
+	 * @see #setCharacterEncoding(String)
+	 */
+	public String getContentAsString() throws UnsupportedEncodingException {
+		if (this.content == null) {
+			return null;
+		}
+
+		return (this.characterEncoding != null ?
+				new String(this.content, this.characterEncoding) : new String(this.content));
+	}
+
 	@Override
 	public int getContentLength() {
 		return (this.content != null ? this.content.length : -1);