1.SpringMVC自动配置
SpringBoot 为我们定义好了SpringMVC的配置文件(org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration.class)，首先我们来参考一下官网的SpringMVC的自动配置的介绍。
官网上介绍SpringMVC自动配置是如下这么介绍的：
他具体说了哪些内容？
1.包括了ContentNegotiatingViewResolver和BeanNameViewResolver这两个bean。
我们可以看一下这两个Bean的源码，在包org.springframework.web.servlet.view(ContentNegotiatingViewResolver)和org.springframework.web.servlet.view(BeanNameViewResolver)下。
在ContentNegotiatingViewResolver.java中有这么一段代码：
@Override
protected void initServletContext(ServletContext servletContext) {
Collection<ViewResolver> matchingBeans =
BeanFactoryUtils.beansOfTypeIncludingAncestors(getApplicationContext(), ViewResolver.class).values();
if (this.viewResolvers == null) {
this.viewResolvers = new ArrayList<ViewResolver>(matchingBeans.size());
for (ViewResolver viewResolver : matchingBeans) {
if (this != viewResolver) {
this.viewResolvers.add(viewResolver);
}
}
}
else {
for (int i = 0; i < viewResolvers.size(); i++) {
if (matchingBeans.contains(viewResolvers.get(i))) {
continue;
}
String name = viewResolvers.get(i).getClass().getName() + i;
getApplicationContext().getAutowireCapableBeanFactory().initializeBean(viewResolvers.get(i), name);
}
}
if (this.viewResolvers.isEmpty()) {
logger.warn("Did not find any ViewResolvers to delegate to; please configure them using the " +
"'viewResolvers' property on the ContentNegotiatingViewResolver");
}
AnnotationAwareOrderComparator.sort(this.viewResolvers);
this.cnmFactoryBean.setServletContext(servletContext);
}
所以这个类的作用就是组合所有的视图解析器，自动配置ViewResovler(视图解析器作用，根据方法返回值得到视图对象view)
在此文件中，可以看到resolveViewName方法，里面代码是从this.viewResolvers获取候选的视图解析器，遍历容器里所有视图，然后通过如图所标记的获取候选视图的方法，获取候选的视图列表，再通过getBestView获取最合适的视图。
@Override
public View resolveViewName(String viewName, Locale locale) throws Exception {
RequestAttributes attrs = RequestContextHolder.getRequestAttributes();
Assert.isInstanceOf(ServletRequestAttributes.class, attrs);
List<MediaType> requestedMediaTypes = getMediaTypes(((ServletRequestAttributes) attrs).getRequest());
if (requestedMediaTypes != null) {
List<View> candidateViews = getCandidateViews(viewName, locale, requestedMediaTypes);
View bestView = getBestView(candidateViews, requestedMediaTypes, attrs);
if (bestView != null) {
return bestView;
}
}
if (this.useNotAcceptableStatusCode) {
if (logger.isDebugEnabled()) {
logger.debug("No acceptable view found; returning 406 (Not Acceptable) status code");
}
return NOT_ACCEPTABLE_VIEW;
}
else {
logger.debug("No acceptable view found; returning null");
return null;
}
}
遍历所有的视图解析器对象，从视图解析器里获取候选的视图，封装成list保存
private List<View> getCandidateViews(String viewName, Locale locale, List<MediaType> requestedMediaTypes)
throws Exception {
List<View> candidateViews = new ArrayList<View>();
for (ViewResolver viewResolver : this.viewResolvers) {
View view = viewResolver.resolveViewName(viewName, locale);
if (view != null) {
candidateViews.add(view);
}
for (MediaType requestedMediaType : requestedMediaTypes) {
List<String> extensions = this.contentNegotiationManager.resolveFileExtensions(requestedMediaType);
for (String extension : extensions) {
String viewNameWithExtension = viewName + '.' + extension;
view = viewResolver.resolveViewName(viewNameWithExtension, locale);
if (view != null) {
candidateViews.add(view);
}
}
}
}
if (!CollectionUtils.isEmpty(this.defaultViews)) {
candidateViews.addAll(this.defaultViews);
}
return candidateViews;
}
我们只需要将视图解析器丢到Spring容器里，就可以加载到。
添加视图解析器。
package com.zk.myspringboot;
import java.util.Locale;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
@SpringBootApplication
public class SpringBootApplicationFirst {
public static void main(String[]args){
SpringApplication.run(SpringBootApplicationFirst.class, args);
}
public ViewResolver myViewResolver(){
return new myViewResolver();
}
private static class myViewResolver implements ViewResolver{
@Override
public View resolveViewName(String string, Locale locale) throws Exception {
// TODO Auto-generated method stub
return null;
}
}
}
DispatcherServlet(org.springframework.web.servlet.DispatcherServlet.class)是Spring核心分发器，找到doDispatch方法，debug，可以看到加的视图解析器加载到了
2.支持服务静态资源，包括支持WebJars。
这个具体怎么支持，我们在之前的博客中已经说明了，具体几个添加静态资源的路径。
3.自动注册Converter， GenericConverter，和 Formatter bean。
看一下这三个转换器的声明：Converter.java
/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.core.convert.converter;
/**
* A converter converts a source object of type {@code S} to a target of type {@code T}.
*
* <p>Implementations of this interface are thread-safe and can be shared.
*
* <p>Implementations may additionally implement {@link ConditionalConverter}.
*
* @author Keith Donald
* @since 3.0
* @param <S> the source type
* @param <T> the target type
*/
public interface Converter<S, T> {
/**
* Convert the source object of type {@code S} to target type {@code T}.
* @param source the source object to convert, which must be an instance of {@code S} (never {@code null})
* @return the converted object, which must be an instance of {@code T} (potentially {@code null})
* @throws IllegalArgumentException if the source cannot be converted to the desired target type
*/
T convert(S source);
}
GenericConverter.java
/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.core.convert.converter;
import java.util.Set;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.util.Assert;
/**
* Generic converter interface for converting between two or more types.
*
* <p>This is the most flexible of the Converter SPI interfaces, but also the most complex.
* It is flexible in that a GenericConverter may support converting between multiple source/target
* type pairs (see {@link #getConvertibleTypes()}. In addition, GenericConverter implementations
* have access to source/target {@link TypeDescriptor field context} during the type conversion
* process. This allows for resolving source and target field metadata such as annotations and
* generics information, which can be used to influence the conversion logic.
*
* <p>This interface should generally not be used when the simpler {@link Converter} or
* {@link ConverterFactory} interface is sufficient.
*
* <p>Implementations may additionally implement {@link ConditionalConverter}.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 3.0
* @see TypeDescriptor
* @see Converter
* @see ConverterFactory
* @see ConditionalConverter
*/
public interface GenericConverter {
/**
* Return the source and target types that this converter can convert between.
* <p>Each entry is a convertible source-to-target type pair.
* <p>For {@link ConditionalConverter conditional converters} this method may return
* {@code null} to indicate all source-to-target pairs should be considered.
*/
Set<ConvertiblePair> getConvertibleTypes();
/**
* Convert the source object to the targetType described by the {@code TypeDescriptor}.
* @param source the source object to convert (may be {@code null})
* @param sourceType the type descriptor of the field we are converting from
* @param targetType the type descriptor of the field we are converting to
* @return the converted object
*/
Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType);
/**
* Holder for a source-to-target class pair.
*/
final class ConvertiblePair {
private final Class<?> sourceType;
private final Class<?> targetType;
/**
* Create a new source-to-target pair.
* @param sourceType the source type
* @param targetType the target type
*/
public ConvertiblePair(Class<?> sourceType, Class<?> targetType) {
Assert.notNull(sourceType, "Source type must not be null");
Assert.notNull(targetType, "Target type must not be null");
this.sourceType = sourceType;
this.targetType = targetType;
}
public Class<?> getSourceType() {
return this.sourceType;
}
public Class<?> getTargetType() {
return this.targetType;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other == null || other.getClass() != ConvertiblePair.class) {
return false;
}
ConvertiblePair otherPair = (ConvertiblePair) other;
return (this.sourceType == otherPair.sourceType && this.targetType == otherPair.targetType);
}
@Override
public int hashCode() {
return (this.sourceType.hashCode() * 31 + this.targetType.hashCode());
}
@Override
public String toString() {
return (this.sourceType.getName() + " -> " + this.targetType.getName());
}
}
}
Formatter.java
/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.format;
/**
* Formats objects of type T.
* A Formatter is both a Printer <i>and</i> a Parser for an object type.
*
* @author Keith Donald
* @since 3.0
* @param <T> the type of object this Formatter formats
*/
public interface Formatter<T> extends Printer<T>, Parser<T> {
}
这是三个格式转换器的声明，主要作用是类型间的转换。
4.支持httpMessageConverter。
这个类是SpringMVC用来转换Http请求和响应的；HttpMessageConverters 是从容器中确定的；获取所有的HttpMessageConverter；如果想自定义给容器中添加HttpMessageConverter，只需要将自己的组件注册容器中就可以了（怎么注册:用@Bean,@Component）
HttpMessageConverters.java
/*
* Copyright 2012-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.autoconfigure.web;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.http.converter.xml.AbstractXmlHttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
/**
* Bean used to manage the {@link HttpMessageConverter}s used in a Spring Boot
* application. Provides a convenient way to add and merge additional
* {@link HttpMessageConverter}s to a web application.
* <p>
* An instance of this bean can be registered with specific
* {@link #HttpMessageConverters(HttpMessageConverter...) additional converters} if
* needed, otherwise default converters will be used.
* <p>
* NOTE: The default converters used are the same as standard Spring MVC (see
* {@link WebMvcConfigurationSupport#getMessageConverters} with some slight re-ordering to
* put XML converters at the back of the list.
*
* @author Dave Syer
* @author Phillip Webb
* @author Andy Wilkinson
* @see #HttpMessageConverters(HttpMessageConverter...)
* @see #HttpMessageConverters(Collection)
* @see #getConverters()
*/
public class HttpMessageConverters implements Iterable<HttpMessageConverter<?>> {
private static final List<Class<?>> NON_REPLACING_CONVERTERS;
static {
List<Class<?>> nonReplacingConverters = new ArrayList<Class<?>>();
addClassIfExists(nonReplacingConverters, "org.springframework.hateoas.mvc."
+ "TypeConstrainedMappingJackson2HttpMessageConverter");
NON_REPLACING_CONVERTERS = Collections.unmodifiableList(nonReplacingConverters);
}
private final List<HttpMessageConverter<?>> converters;
/**
* Create a new {@link HttpMessageConverters} instance with the specified additional
* converters.
* @param additionalConverters additional converters to be added. New converters will
* be added to the front of the list, overrides will replace existing items without
* changing the order. The {@link #getConverters()} methods can be used for further
* converter manipulation.
*/
public HttpMessageConverters(HttpMessageConverter<?>... additionalConverters) {
this(Arrays.asList(additionalConverters));
}
/**
* Create a new {@link HttpMessageConverters} instance with the specified additional
* converters.
* @param additionalConverters additional converters to be added. Items are added just
* before any default converter of the same type (or at the front of the list if no
* default converter is found) The {@link #postProcessConverters(List)} method can be
* used for further converter manipulation.
*/
public HttpMessageConverters(
Collection<HttpMessageConverter<?>> additionalConverters) {
this(true, additionalConverters);
}
/**
* Create a new {@link HttpMessageConverters} instance with the specified converters.
* @param addDefaultConverters if default converters should be added
* @param converters converters to be added. Items are added just before any default
* converter of the same type (or at the front of the list if no default converter is
* found) The {@link #postProcessConverters(List)} method can be used for further
* converter manipulation.
*/
public HttpMessageConverters(boolean addDefaultConverters,
Collection<HttpMessageConverter<?>> converters) {
List<HttpMessageConverter<?>> combined = getCombinedConverters(converters,
addDefaultConverters ? getDefaultConverters()
: Collections.<HttpMessageConverter<?>>emptyList());
combined = postProcessConverters(combined);
this.converters = Collections.unmodifiableList(combined);
}
private List<HttpMessageConverter<?>> getCombinedConverters(
Collection<HttpMessageConverter<?>> converters,
List<HttpMessageConverter<?>> defaultConverters) {
List<HttpMessageConverter<?>> combined = new ArrayList<HttpMessageConverter<?>>();
List<HttpMessageConverter<?>> processing = new ArrayList<HttpMessageConverter<?>>(
converters);
for (HttpMessageConverter<?> defaultConverter : defaultConverters) {
Iterator<HttpMessageConverter<?>> iterator = processing.iterator();
while (iterator.hasNext()) {
HttpMessageConverter<?> candidate = iterator.next();
if (isReplacement(defaultConverter, candidate)) {
combined.add(candidate);
iterator.remove();
}
}
combined.add(defaultConverter);
if (defaultConverter instanceof AllEncompassingFormHttpMessageConverter) {
configurePartConverters(
(AllEncompassingFormHttpMessageConverter) defaultConverter,
converters);
}
}
combined.addAll(0, processing);
return combined;
}
private boolean isReplacement(HttpMessageConverter<?> defaultConverter,
HttpMessageConverter<?> candidate) {
for (Class<?> nonReplacingConverter : NON_REPLACING_CONVERTERS) {
if (nonReplacingConverter.isInstance(candidate)) {
return false;
}
}
return ClassUtils.isAssignableValue(defaultConverter.getClass(), candidate);
}
private void configurePartConverters(
AllEncompassingFormHttpMessageConverter formConverter,
Collection<HttpMessageConverter<?>> converters) {
List<HttpMessageConverter<?>> partConverters = extractPartConverters(
formConverter);
List<HttpMessageConverter<?>> combinedConverters = getCombinedConverters(
converters, partConverters);
combinedConverters = postProcessPartConverters(combinedConverters);
formConverter.setPartConverters(combinedConverters);
}
@SuppressWarnings("unchecked")
private List<HttpMessageConverter<?>> extractPartConverters(
FormHttpMessageConverter formConverter) {
Field field = ReflectionUtils.findField(FormHttpMessageConverter.class,
"partConverters");
ReflectionUtils.makeAccessible(field);
return (List<HttpMessageConverter<?>>) ReflectionUtils.getField(field,
formConverter);
}
/**
* Method that can be used to post-process the {@link HttpMessageConverter} list
* before it is used.
* @param converters a mutable list of the converters that will be used.
* @return the final converts list to use
*/
protected List<HttpMessageConverter<?>> postProcessConverters(
List<HttpMessageConverter<?>> converters) {
return converters;
}
/**
* Method that can be used to post-process the {@link HttpMessageConverter} list
* before it is used to configure the part converters of
* {@link AllEncompassingFormHttpMessageConverter}.
* @param converters a mutable list of the converters that will be used.
* @return the final converts list to use
* @since 1.3.0
*/
protected List<HttpMessageConverter<?>> postProcessPartConverters(
List<HttpMessageConverter<?>> converters) {
return converters;
}
private List<HttpMessageConverter<?>> getDefaultConverters() {
List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
if (ClassUtils.isPresent("org.springframework.web.servlet.config.annotation."
+ "WebMvcConfigurationSupport", null)) {
converters.addAll(new WebMvcConfigurationSupport() {
public List<HttpMessageConverter<?>> defaultMessageConverters() {
return super.getMessageConverters();
}
}.defaultMessageConverters());
}
else {
converters.addAll(new RestTemplate().getMessageConverters());
}
reorderXmlConvertersToEnd(converters);
return converters;
}
private void reorderXmlConvertersToEnd(List<HttpMessageConverter<?>> converters) {
List<HttpMessageConverter<?>> xml = new ArrayList<HttpMessageConverter<?>>();
for (Iterator<HttpMessageConverter<?>> iterator = converters.iterator(); iterator
.hasNext();) {
HttpMessageConverter<?> converter = iterator.next();
if ((converter instanceof AbstractXmlHttpMessageConverter)
|| (converter instanceof MappingJackson2XmlHttpMessageConverter)) {
xml.add(converter);
iterator.remove();
}
}
converters.addAll(xml);
}
@Override
public Iterator<HttpMessageConverter<?>> iterator() {
return getConverters().iterator();
}
/**
* Return an immutable list of the converters in the order that they will be
* registered.
* @return the converters
*/
public List<HttpMessageConverter<?>> getConverters() {
return this.converters;
}
private static void addClassIfExists(List<Class<?>> list, String className) {
try {
list.add(Class.forName(className));
}
catch (ClassNotFoundException ex) {
// Ignore
}
catch (NoClassDefFoundError ex) {
// Ignore
}
}
}
5.自动注册MessageCodesResolver。
Spring MVC有一个生成错误代码的策略，用于呈现来自错误消息：MessageCodesResolver。如果设置了spring.mvc.message-codes-resolver.format属性PREFIX_ERROR_CODE或POSTFIX_ERROR_CODE，则spring Boot会创建一个MessageCodesResolver。
MessageCodesResolver.java
/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.validation;
/**
* Strategy interface for building message codes from validation error codes.
* Used by DataBinder to build the codes list for ObjectErrors and FieldErrors.
*
* <p>The resulting message codes correspond to the codes of a
* MessageSourceResolvable (as implemented by ObjectError and FieldError).
*
* @author Juergen Hoeller
* @since 1.0.1
* @see DataBinder#setMessageCodesResolver
* @see ObjectError
* @see FieldError
* @see org.springframework.context.MessageSourceResolvable#getCodes()
*/
public interface MessageCodesResolver {
/**
* Build message codes for the given error code and object name.
* Used for building the codes list of an ObjectError.
* @param errorCode the error code used for rejecting the object
* @param objectName the name of the object
* @return the message codes to use
*/
String[] resolveMessageCodes(String errorCode, String objectName);
/**
* Build message codes for the given error code and field specification.
* Used for building the codes list of an FieldError.
* @param errorCode the error code used for rejecting the value
* @param objectName the name of the object
* @param field the field name
* @param fieldType the field type (may be {@code null} if not determinable)
* @return the message codes to use
*/
String[] resolveMessageCodes(String errorCode, String objectName, String field, Class<?> fieldType);
}
6.静态index.html支持。
7.自定义Favicon支持(图标支持)
Spring Boot在配置的静态内容位置和类路径的根目录（按顺序）中查找favicon.ico。如果存在这样的文件，它将自动用作应用程序的favicon。
8.自动使用ConfigurableWebBindingInitializer
Spring MVC使用WeBindinginitializer为特定请求初始化WebDataBinder。如果您创建自己的Configurablewebindinginitializer，Spring Boot会自动将Spring MVC配置为使用它。
ConfigurableWebBindingInitializer.java
/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.bind.support;
import org.springframework.beans.PropertyEditorRegistrar;
import org.springframework.core.convert.ConversionService;
import org.springframework.validation.BindingErrorProcessor;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.context.request.WebRequest;
/**
* Convenient {@link WebBindingInitializer} for declarative configuration
* in a Spring application context. Allows for reusing pre-configured
* initializers with multiple controller/handlers.
*
* @author Juergen Hoeller
* @since 2.5
* @see #setDirectFieldAccess
* @see #setMessageCodesResolver
* @see #setBindingErrorProcessor
* @see #setValidator(Validator)
* @see #setConversionService(ConversionService)
* @see #setPropertyEditorRegistrar
*/
public class ConfigurableWebBindingInitializer implements WebBindingInitializer {
private boolean autoGrowNestedPaths = true;
private boolean directFieldAccess = false;
private MessageCodesResolver messageCodesResolver;
private BindingErrorProcessor bindingErrorProcessor;
private Validator validator;
private ConversionService conversionService;
private PropertyEditorRegistrar[] propertyEditorRegistrars;
/**
* Set whether a binder should attempt to "auto-grow" a nested path that contains a null value.
* <p>If "true", a null path location will be populated with a default object value and traversed
* instead of resulting in an exception. This flag also enables auto-growth of collection elements
* when accessing an out-of-bounds index.
* <p>Default is "true" on a standard DataBinder. Note that this feature is only supported
* for bean property access (DataBinder's default mode), not for field access.
* @see org.springframework.validation.DataBinder#initBeanPropertyAccess()
* @see org.springframework.validation.DataBinder#setAutoGrowNestedPaths
*/
public void setAutoGrowNestedPaths(boolean autoGrowNestedPaths) {
this.autoGrowNestedPaths = autoGrowNestedPaths;
}
/**
* Return whether a binder should attempt to "auto-grow" a nested path that contains a null value.
*/
public boolean isAutoGrowNestedPaths() {
return this.autoGrowNestedPaths;
}
/**
* Set whether to use direct field access instead of bean property access.
* <p>Default is {@code false}, using bean property access.
* Switch this to {@code true} in order to enforce direct field access.
* @see org.springframework.validation.DataBinder#initDirectFieldAccess()
* @see org.springframework.validation.DataBinder#initBeanPropertyAccess()
*/
public final void setDirectFieldAccess(boolean directFieldAccess) {
this.directFieldAccess = directFieldAccess;
}
/**
* Return whether to use direct field access instead of bean property access.
*/
public boolean isDirectFieldAccess() {
return directFieldAccess;
}
/**
* Set the strategy to use for resolving errors into message codes.
* Applies the given strategy to all data binders used by this controller.
* <p>Default is {@code null}, i.e. using the default strategy of
* the data binder.
* @see org.springframework.validation.DataBinder#setMessageCodesResolver
*/
public final void setMessageCodesResolver(MessageCodesResolver messageCodesResolver) {
this.messageCodesResolver = messageCodesResolver;
}
/**
* Return the strategy to use for resolving errors into message codes.
*/
public final MessageCodesResolver getMessageCodesResolver() {
return this.messageCodesResolver;
}
/**
* Set the strategy to use for processing binding errors, that is,
* required field errors and {@code PropertyAccessException}s.
* <p>Default is {@code null}, that is, using the default strategy
* of the data binder.
* @see org.springframework.validation.DataBinder#setBindingErrorProcessor
*/
public final void setBindingErrorProcessor(BindingErrorProcessor bindingErrorProcessor) {
this.bindingErrorProcessor = bindingErrorProcessor;
}
/**
* Return the strategy to use for processing binding errors.
*/
public final BindingErrorProcessor getBindingErrorProcessor() {
return this.bindingErrorProcessor;
}
/**
* Set the Validator to apply after each binding step.
*/
public final void setValidator(Validator validator) {
this.validator = validator;
}
/**
* Return the Validator to apply after each binding step, if any.
*/
public final Validator getValidator() {
return this.validator;
}
/**
* Specify a ConversionService which will apply to every DataBinder.
* @since 3.0
*/
public final void setConversionService(ConversionService conversionService) {
this.conversionService = conversionService;
}
/**
* Return the ConversionService which will apply to every DataBinder.
*/
public final ConversionService getConversionService() {
return this.conversionService;
}
/**
* Specify a single PropertyEditorRegistrar to be applied to every DataBinder.
*/
public final void setPropertyEditorRegistrar(PropertyEditorRegistrar propertyEditorRegistrar) {
this.propertyEditorRegistrars = new PropertyEditorRegistrar[] {propertyEditorRegistrar};
}
/**
* Specify multiple PropertyEditorRegistrars to be applied to every DataBinder.
*/
public final void setPropertyEditorRegistrars(PropertyEditorRegistrar[] propertyEditorRegistrars) {
this.propertyEditorRegistrars = propertyEditorRegistrars;
}
/**
* Return the PropertyEditorRegistrars to be applied to every DataBinder.
*/
public final PropertyEditorRegistrar[] getPropertyEditorRegistrars() {
return this.propertyEditorRegistrars;
}
@Override
public void initBinder(WebDataBinder binder, WebRequest request) {
binder.setAutoGrowNestedPaths(this.autoGrowNestedPaths);
if (this.directFieldAccess) {
binder.initDirectFieldAccess();
}
if (this.messageCodesResolver != null) {
binder.setMessageCodesResolver(this.messageCodesResolver);
}
if (this.bindingErrorProcessor != null) {
binder.setBindingErrorProcessor(this.bindingErrorProcessor);
}
if (this.validator != null && binder.getTarget() != null &&
this.validator.supports(binder.getTarget().getClass())) {
binder.setValidator(this.validator);
}
if (this.conversionService != null) {
binder.setConversionService(this.conversionService);
}
if (this.propertyEditorRegistrars != null) {
for (PropertyEditorRegistrar propertyEditorRegistrar : this.propertyEditorRegistrars) {
propertyEditorRegistrar.registerCustomEditors(binder);
}
}
}
}
2、扩展SpringMVC
如果您希望保留Spring Boot MVC功能，并且希望添加其他MVC配置（拦截器、格式化程序、视图控制器和其他功能），则可以添加自己的@configuration类，类型为webmvcconfiguer，但不添加@EnableWebMvc。如果希望提供RequestMappingHandlerMapping、RequestMappingHandlerAdapter或ExceptionHandlerExceptionResolver的自定义实例，则可以声明WebMVCregistrationAdapter实例来提供此类组件。
举个例子：
我们继承WebMvcConfigurer方法，添加自己的方法MyWebMvcConfig
MyWebMvcConfig.class
package com.zk.myspringboot;
import java.util.List;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
* 静态资源映射
*/
@Configuration
public class MyWebMvcConfig implements WebMvcConfigurer {
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
/* registry.addResourceHandler("/test/**")
.addResourceLocations("classpath:/test/");*/
}
@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> arg0) {
// TODO Auto-generated method stub
}
@Override
public void addCorsMappings(CorsRegistry arg0) {
// TODO Auto-generated method stub
}
@Override
public void addFormatters(FormatterRegistry arg0) {
// TODO Auto-generated method stub
}
@Override
public void addInterceptors(InterceptorRegistry arg0) {
// TODO Auto-generated method stub
}
@Override
public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> arg0) {
// TODO Auto-generated method stub
}
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// TODO Auto-generated method stub
registry.addViewController("/tang").setViewName("index");
}
@Override
public void configureAsyncSupport(AsyncSupportConfigurer arg0) {
// TODO Auto-generated method stub
}
@Override
public void configureContentNegotiation(ContentNegotiationConfigurer arg0) {
// TODO Auto-generated method stub
}
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer arg0) {
// TODO Auto-generated method stub
}
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) {
// TODO Auto-generated method stub
}
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> arg0) {
// TODO Auto-generated method stub
}
@Override
public void configurePathMatch(PathMatchConfigurer arg0) {
// TODO Auto-generated method stub
}
@Override
public void configureViewResolvers(ViewResolverRegistry arg0) {
// TODO Auto-generated method stub
}
@Override
public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) {
// TODO Auto-generated method stub
}
@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> arg0) {
// TODO Auto-generated method stub
}
@Override
public MessageCodesResolver getMessageCodesResolver() {
// TODO Auto-generated method stub
return null;
}
@Override
public Validator getValidator() {
// TODO Auto-generated method stub
return null;
}
}
这里我只试验了一个方法
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// TODO Auto-generated method stub
registry.addViewController("/tang").setViewName("index");
}
启动程序访问结果如下：
它会访问到index.html页面
3.全面接管SpringMVC