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@RequestBody supports java.util.Optional 

Issue: SPR-15007
This commit is contained in:
Juergen Hoeller 2016-12-13 13:00:03 +01:00
parent 52f664139f
commit eeb7ae537f
4 changed files with 125 additions and 73 deletions
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69
spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodArgumentResolver.java
View File

@ -22,10 +22,12 @@ import java.io.PushbackInputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
@ -59,6 +61,7 @@ import org.springframework.web.method.support.HandlerMethodArgumentResolver;
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.1
*/
public abstract class AbstractMessageConverterMethodArgumentResolver implements HandlerMethodArgumentResolver {
@ -128,17 +131,17 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
* reading from the given request.
* @param <T> the expected type of the argument value to be created
* @param webRequest the current request
* @param methodParam the method argument
* @param parameter the method parameter descriptor (may be {@code null})
* @param paramType the type of the argument value to be created
* @return the created method argument value
* @throws IOException if the reading from the request fails
* @throws HttpMediaTypeNotSupportedException if no suitable message converter is found
*/
protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter methodParam,
protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter parameter,
Type paramType) throws IOException, HttpMediaTypeNotSupportedException, HttpMessageNotReadableException {
HttpInputMessage inputMessage = createInputMessage(webRequest);
return readWithMessageConverters(inputMessage, methodParam, paramType);
return readWithMessageConverters(inputMessage, parameter, paramType);
}
/**
@ -146,7 +149,7 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
* from the given HttpInputMessage.
* @param <T> the expected type of the argument value to be created
* @param inputMessage the HTTP input message representing the current request
* @param param the method parameter descriptor (may be {@code null})
* @param parameter the method parameter descriptor (may be {@code null})
* @param targetType the target type, not necessarily the same as the method
* parameter type, e.g. for {@code HttpEntity<String>}.
* @return the created method argument value
@ -154,7 +157,7 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
* @throws HttpMediaTypeNotSupportedException if no suitable message converter is found
*/
@SuppressWarnings("unchecked")
protected <T> Object readWithMessageConverters(HttpInputMessage inputMessage, MethodParameter param,
protected <T> Object readWithMessageConverters(HttpInputMessage inputMessage, MethodParameter parameter,
Type targetType) throws IOException, HttpMediaTypeNotSupportedException, HttpMessageNotReadableException {
MediaType contentType;
@ -170,11 +173,11 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
contentType = MediaType.APPLICATION_OCTET_STREAM;
}
Class<?> contextClass = (param != null ? param.getContainingClass() : null);
Class<?> contextClass = (parameter != null ? parameter.getContainingClass() : null);
Class<T> targetClass = (targetType instanceof Class ? (Class<T>) targetType : null);
if (targetClass == null) {
ResolvableType resolvableType = (param != null ?
ResolvableType.forMethodParameter(param) : ResolvableType.forType(targetType));
ResolvableType resolvableType = (parameter != null ?
ResolvableType.forMethodParameter(parameter) : ResolvableType.forType(targetType));
targetClass = (Class<T>) resolvableType.resolve();
}
@ -193,13 +196,12 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
logger.debug("Read [" + targetType + "] as \"" + contentType + "\" with [" + converter + "]");
}
if (inputMessage.getBody() != null) {
inputMessage = getAdvice().beforeBodyRead(inputMessage, param, targetType, converterType);
inputMessage = getAdvice().beforeBodyRead(inputMessage, parameter, targetType, converterType);
body = genericConverter.read(targetType, contextClass, inputMessage);
body = getAdvice().afterBodyRead(body, inputMessage, param, targetType, converterType);
body = getAdvice().afterBodyRead(body, inputMessage, parameter, targetType, converterType);
}
else {
body = null;
body = getAdvice().handleEmptyBody(body, inputMessage, param, targetType, converterType);
body = getAdvice().handleEmptyBody(null, inputMessage, parameter, targetType, converterType);
}
break;
}
@ -210,13 +212,12 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
logger.debug("Read [" + targetType + "] as \"" + contentType + "\" with [" + converter + "]");
}
if (inputMessage.getBody() != null) {
inputMessage = getAdvice().beforeBodyRead(inputMessage, param, targetType, converterType);
inputMessage = getAdvice().beforeBodyRead(inputMessage, parameter, targetType, converterType);
body = ((HttpMessageConverter<T>) converter).read(targetClass, inputMessage);
body = getAdvice().afterBodyRead(body, inputMessage, param, targetType, converterType);
body = getAdvice().afterBodyRead(body, inputMessage, parameter, targetType, converterType);
}
else {
body = null;
body = getAdvice().handleEmptyBody(body, inputMessage, param, targetType, converterType);
body = getAdvice().handleEmptyBody(null, inputMessage, parameter, targetType, converterType);
}
break;
}
@ -254,12 +255,12 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
* Spring's {@link org.springframework.validation.annotation.Validated},
* and custom annotations whose name starts with "Valid".
* @param binder the DataBinder to be used
* @param methodParam the method parameter
* @see #isBindExceptionRequired
* @param parameter the method parameter descriptor
* @since 4.1.5
* @see #isBindExceptionRequired
*/
protected void validateIfApplicable(WebDataBinder binder, MethodParameter methodParam) {
Annotation[] annotations = methodParam.getParameterAnnotations();
protected void validateIfApplicable(WebDataBinder binder, MethodParameter parameter) {
Annotation[] annotations = parameter.getParameterAnnotations();
for (Annotation ann : annotations) {
Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
@ -274,17 +275,37 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
/**
* Whether to raise a fatal bind exception on validation errors.
* @param binder the data binder used to perform data binding
* @param methodParam the method argument
* @param parameter the method parameter descriptor
* @return {@code true} if the next method argument is not of type {@link Errors}
* @since 4.1.5
*/
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter methodParam) {
int i = methodParam.getParameterIndex();
Class<?>[] paramTypes = methodParam.getMethod().getParameterTypes();
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter parameter) {
int i = parameter.getParameterIndex();
Class<?>[] paramTypes = parameter.getMethod().getParameterTypes();
boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));
return !hasBindingResult;
}
/**
* Adapt the given argument against the method parameter, if necessary.
* @param arg the resolved argument
* @param parameter the method parameter descriptor
* @return the adapted argument, or the original resolved argument as-is
* @since 4.3.5
*/
protected Object adaptArgumentIfNecessary(Object arg, MethodParameter parameter) {
if (parameter.getParameterType() == Optional.class) {
if (arg == null || (arg instanceof Collection && ((Collection) arg).isEmpty()) ||
(arg instanceof Object[] && ((Object[]) arg).length == 0)) {
return Optional.empty();
}
else {
return Optional.of(arg);
}
}
return arg;
}
private static class EmptyBodyCheckingHttpInputMessage implements HttpInputMessage {

14
spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestPartMethodArgumentResolver.java
View File

@ -16,9 +16,7 @@
package org.springframework.web.servlet.mvc.method.annotation;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import javax.servlet.http.HttpServletRequest;
import org.springframework.core.MethodParameter;
@ -156,17 +154,7 @@ public class RequestPartMethodArgumentResolver extends AbstractMessageConverterM
throw new MissingServletRequestPartException(name);
}
}
if (parameter.getParameterType() == Optional.class) {
if (arg == null || (arg instanceof Collection && ((Collection) arg).isEmpty()) ||
(arg instanceof Object[] && ((Object[]) arg).length == 0)) {
arg = Optional.empty();
}
else {
arg = Optional.of(arg);
}
}
return arg;
return adaptArgumentIfNecessary(arg, parameter);
}
private String getPartName(MethodParameter methodParam, RequestPart requestPart) {

19
spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessor.java
View File

@ -19,7 +19,6 @@ package org.springframework.web.servlet.mvc.method.annotation;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.springframework.core.Conventions;
@ -55,6 +54,7 @@ import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolv
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.1
*/
public class RequestResponseBodyMethodProcessor extends AbstractMessageConverterMethodProcessor {
@ -124,7 +124,8 @@ public class RequestResponseBodyMethodProcessor extends AbstractMessageConverter
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
Object arg = readWithMessageConverters(webRequest, parameter, parameter.getGenericParameterType());
parameter = parameter.nestedIfOptional();
Object arg = readWithMessageConverters(webRequest, parameter, parameter.getNestedGenericParameterType());
String name = Conventions.getVariableNameForParameter(parameter);
WebDataBinder binder = binderFactory.createBinder(webRequest, arg, name);
@ -136,28 +137,28 @@ public class RequestResponseBodyMethodProcessor extends AbstractMessageConverter
}
mavContainer.addAttribute(BindingResult.MODEL_KEY_PREFIX + name, binder.getBindingResult());
return arg;
return adaptArgumentIfNecessary(arg, parameter);
}
@Override
protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter methodParam,
protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter parameter,
Type paramType) throws IOException, HttpMediaTypeNotSupportedException, HttpMessageNotReadableException {
HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
ServletServerHttpRequest inputMessage = new ServletServerHttpRequest(servletRequest);
Object arg = readWithMessageConverters(inputMessage, methodParam, paramType);
Object arg = readWithMessageConverters(inputMessage, parameter, paramType);
if (arg == null) {
if (checkRequired(methodParam)) {
if (checkRequired(parameter)) {
throw new HttpMessageNotReadableException("Required request body is missing: " +
methodParam.getMethod().toGenericString());
parameter.getMethod().toGenericString());
}
}
return arg;
}
protected boolean checkRequired(MethodParameter methodParam) {
return methodParam.getParameterAnnotation(RequestBody.class).required();
protected boolean checkRequired(MethodParameter parameter) {
return (parameter.getParameterAnnotation(RequestBody.class).required() && !parameter.isOptional());
}
@Override

96
spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessorMockTests.java
View File

@ -21,6 +21,7 @@ import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import javax.validation.Valid;
import javax.validation.constraints.NotNull;
@ -61,6 +62,7 @@ import static org.mockito.BDDMockito.*;
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
*/
public class RequestResponseBodyMethodProcessorMockTests {
@ -74,6 +76,7 @@ public class RequestResponseBodyMethodProcessorMockTests {
private MethodParameter paramInt;
private MethodParameter paramValidBean;
private MethodParameter paramStringNotRequired;
private MethodParameter paramOptionalString;
private MethodParameter returnTypeString;
private MethodParameter returnTypeInt;
private MethodParameter returnTypeStringProduces;
@ -102,12 +105,13 @@ public class RequestResponseBodyMethodProcessorMockTests {
Method methodHandle1 = getClass().getMethod("handle1", String.class, Integer.TYPE);
paramRequestBodyString = new MethodParameter(methodHandle1, 0);
paramInt = new MethodParameter(methodHandle1, 1);
paramValidBean = new MethodParameter(getClass().getMethod("handle2", SimpleBean.class), 0);
paramStringNotRequired = new MethodParameter(getClass().getMethod("handle3", String.class), 0);
paramOptionalString = new MethodParameter(getClass().getMethod("handle4", Optional.class), 0);
returnTypeString = new MethodParameter(methodHandle1, -1);
returnTypeInt = new MethodParameter(getClass().getMethod("handle2"), -1);
returnTypeStringProduces = new MethodParameter(getClass().getMethod("handle3"), -1);
returnTypeResource = new MethodParameter(getClass().getMethod("handle6"), -1);
paramValidBean = new MethodParameter(getClass().getMethod("handle4", SimpleBean.class), 0);
paramStringNotRequired = new MethodParameter(getClass().getMethod("handle5", String.class), 0);
returnTypeInt = new MethodParameter(getClass().getMethod("handle5"), -1);
returnTypeStringProduces = new MethodParameter(getClass().getMethod("handle6"), -1);
returnTypeResource = new MethodParameter(getClass().getMethod("handle7"), -1);
mavContainer = new ModelAndViewContainer();
@ -204,9 +208,7 @@ public class RequestResponseBodyMethodProcessorMockTests {
processor.resolveArgument(paramRequestBodyString, mavContainer, webRequest, null);
}
// SPR-9942
@Test(expected = HttpMessageNotReadableException.class)
@Test(expected = HttpMessageNotReadableException.class) // SPR-9942
public void resolveArgumentRequiredNoContent() throws Exception {
servletRequest.setContentType(MediaType.TEXT_PLAIN_VALUE);
servletRequest.setContent(new byte[0]);
@ -215,6 +217,23 @@ public class RequestResponseBodyMethodProcessorMockTests {
assertNull(processor.resolveArgument(paramRequestBodyString, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
public void resolveArgumentNotGetRequests() throws Exception {
servletRequest.setMethod("GET");
servletRequest.setContent(new byte[0]);
given(stringMessageConverter.canRead(String.class, MediaType.APPLICATION_OCTET_STREAM)).willReturn(false);
assertNull(processor.resolveArgument(paramStringNotRequired, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
public void resolveArgumentNotRequiredWithContent() throws Exception {
servletRequest.setContentType("text/plain");
servletRequest.setContent("body".getBytes());
given(stringMessageConverter.canRead(String.class, MediaType.TEXT_PLAIN)).willReturn(true);
given(stringMessageConverter.read(eq(String.class), isA(HttpInputMessage.class))).willReturn("body");
assertEquals("body", processor.resolveArgument(paramStringNotRequired, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
public void resolveArgumentNotRequiredNoContent() throws Exception {
servletRequest.setContentType("text/plain");
@ -223,8 +242,7 @@ public class RequestResponseBodyMethodProcessorMockTests {
assertNull(processor.resolveArgument(paramStringNotRequired, mavContainer, webRequest, new ValidatingBinderFactory()));
}
// SPR-13417
@Test
@Test // SPR-13417
public void resolveArgumentNotRequiredNoContentNoContentType() throws Exception {
servletRequest.setContent(new byte[0]);
given(stringMessageConverter.canRead(String.class, MediaType.TEXT_PLAIN)).willReturn(true);
@ -233,11 +251,28 @@ public class RequestResponseBodyMethodProcessorMockTests {
}
@Test
public void resolveArgumentNotGetRequests() throws Exception {
servletRequest.setMethod("GET");
public void resolveArgumentOptionalWithContent() throws Exception {
servletRequest.setContentType("text/plain");
servletRequest.setContent("body".getBytes());
given(stringMessageConverter.canRead(String.class, MediaType.TEXT_PLAIN)).willReturn(true);
given(stringMessageConverter.read(eq(String.class), isA(HttpInputMessage.class))).willReturn("body");
assertEquals(Optional.of("body"), processor.resolveArgument(paramOptionalString, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
public void resolveArgumentOptionalNoContent() throws Exception {
servletRequest.setContentType("text/plain");
servletRequest.setContent(new byte[0]);
given(stringMessageConverter.canRead(String.class, MediaType.TEXT_PLAIN)).willReturn(true);
assertEquals(Optional.empty(), processor.resolveArgument(paramOptionalString, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
public void resolveArgumentOptionalNoContentNoContentType() throws Exception {
servletRequest.setContent(new byte[0]);
given(stringMessageConverter.canRead(String.class, MediaType.TEXT_PLAIN)).willReturn(true);
given(stringMessageConverter.canRead(String.class, MediaType.APPLICATION_OCTET_STREAM)).willReturn(false);
assertNull(processor.resolveArgument(paramStringNotRequired, mavContainer, webRequest, new ValidatingBinderFactory()));
assertEquals(Optional.empty(), processor.resolveArgument(paramOptionalString, mavContainer, webRequest, new ValidatingBinderFactory()));
}
@Test
@ -311,9 +346,7 @@ public class RequestResponseBodyMethodProcessorMockTests {
assertEquals(200, servletResponse.getStatus());
}
// SPR-9841
@Test
@Test // SPR-9841
public void handleReturnValueMediaTypeSuffix() throws Exception {
String body = "Foo";
MediaType accepted = MediaType.APPLICATION_XHTML_XML;
@ -339,29 +372,37 @@ public class RequestResponseBodyMethodProcessorMockTests {
}
@SuppressWarnings("unused")
public int handle2() {
public void handle2(@Valid @RequestBody SimpleBean b) {
}
@SuppressWarnings("unused")
public void handle3(@RequestBody(required = false) String s) {
}
@SuppressWarnings("unused")
public void handle4(@RequestBody Optional<String> s) {
}
@SuppressWarnings("unused")
public int handle5() {
return 42;
}
@SuppressWarnings("unused")
@ResponseBody
public String handle3() {
public String handle6() {
return null;
}
@SuppressWarnings("unused")
public void handle4(@Valid @RequestBody SimpleBean b) {
}
@SuppressWarnings("unused")
public void handle5(@RequestBody(required=false) String s) {
}
@SuppressWarnings("unused")
@ResponseBody
public Resource handle6() {return null;}
public Resource handle7() {
return null;
}
private final class ValidatingBinderFactory implements WebDataBinderFactory {
@Override
public WebDataBinder createBinder(NativeWebRequest webRequest, Object target, String objectName) throws Exception {
LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
@ -372,6 +413,7 @@ public class RequestResponseBodyMethodProcessorMockTests {
}
}
@SuppressWarnings("unused")
private static class SimpleBean {