java.lang.Object
- org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver

所有已实现的接口:
HandlerMethodArgumentResolver
直接已知子类:
AbstractCookieValueMethodArgumentResolver, ExpressionValueMethodArgumentResolver, MatrixVariableMethodArgumentResolver, PathVariableMethodArgumentResolver, RequestAttributeMethodArgumentResolver, RequestHeaderMethodArgumentResolver, RequestParamMethodArgumentResolver, SessionAttributeMethodArgumentResolver
```
public abstract class AbstractNamedValueMethodArgumentResolver
extends Object
implements HandlerMethodArgumentResolver
```
Abstract base class for resolving method arguments from a named value. Request parameters, request headers, and path variables are examples of named values. Each may have a name, a required flag, and a default value.
Subclasses define how to do the following:
- Obtain named value information for a method parameter
- Resolve names into argument values
- Handle missing argument values when argument values are required
- Optionally handle a resolved value
A default value string can contain ${...} placeholders and Spring Expression Language #{...} expressions. For this to work a ConfigurableBeanFactory must be supplied to the class constructor.
A WebDataBinder is created to apply type conversion to the resolved argument value if it doesn't match the method parameter type.
从以下版本开始:
3.1
作者:
Arjen Poutsma, Rossen Stoyanchev, Juergen Hoeller

嵌套类概要

嵌套类
修饰符和类型	类	说明
`protected static class`	`AbstractNamedValueMethodArgumentResolver.NamedValueInfo`	Represents the information about a named value, including name, whether it's required and a default value.

构造器概要

构造器
构造器	说明
`AbstractNamedValueMethodArgumentResolver()`
`AbstractNamedValueMethodArgumentResolver(ConfigurableBeanFactory beanFactory)`	Create a new `AbstractNamedValueMethodArgumentResolver` instance.

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`protected abstract AbstractNamedValueMethodArgumentResolver.NamedValueInfo`	`createNamedValueInfo(MethodParameter parameter)`	Create the `AbstractNamedValueMethodArgumentResolver.NamedValueInfo` object for the given method parameter.
`protected void`	`handleMissingValue(String name, MethodParameter parameter)`	Invoked when a named value is required, but `resolveName(String, MethodParameter, NativeWebRequest)` returned `null` and there is no default value.
`protected void`	`handleMissingValue(String name, MethodParameter parameter, NativeWebRequest request)`	Invoked when a named value is required, but `resolveName(String, MethodParameter, NativeWebRequest)` returned `null` and there is no default value.
`protected void`	`handleResolvedValue(Object arg, String name, MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest)`	Invoked after a value is resolved.
`Object`	`resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory)`	Resolves a method parameter into an argument value from a given request.
`protected abstract Object`	`resolveName(String name, MethodParameter parameter, NativeWebRequest request)`	Resolve the given parameter type and value name into an argument value.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.springframework.web.method.support.HandlerMethodArgumentResolver
supportsParameter

- 构造器详细资料
  - AbstractNamedValueMethodArgumentResolver
```
public AbstractNamedValueMethodArgumentResolver()
```
  - AbstractNamedValueMethodArgumentResolver
```
public AbstractNamedValueMethodArgumentResolver(@Nullable
                                                ConfigurableBeanFactory beanFactory)
```
    Create a new AbstractNamedValueMethodArgumentResolver instance.
    参数:
    beanFactory - a bean factory to use for resolving ${...} placeholder and #{...} SpEL expressions in default values, or null if default values are not expected to contain expressions
- 方法详细资料
  - resolveArgument
```
@Nullable
public final Object resolveArgument(MethodParameter parameter,
                                    @Nullable
                                    ModelAndViewContainer mavContainer,
                                    NativeWebRequest webRequest,
                                    @Nullable
                                    WebDataBinderFactory binderFactory)
                             throws Exception
```
    从接口复制的说明: HandlerMethodArgumentResolver
    Resolves a method parameter into an argument value from a given request. A ModelAndViewContainer provides access to the model for the request. A WebDataBinderFactory provides a way to create a WebDataBinder instance when needed for data binding and type conversion purposes.
    指定者:
    resolveArgument 在接口中 HandlerMethodArgumentResolver
    参数:
    parameter - the method parameter to resolve. This parameter must have previously been passed to HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter) which must have returned true.
    mavContainer - the ModelAndViewContainer for the current request
    webRequest - the current request
    binderFactory - a factory for creating WebDataBinder instances
    返回:
    the resolved argument value, or null if not resolvable
    抛出:
    Exception - in case of errors with the preparation of argument values
  - createNamedValueInfo
```
protected abstract AbstractNamedValueMethodArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)
```
    Create the AbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).
    参数:
    parameter - the method parameter
    返回:
    the named value information
  - resolveName
```
@Nullable
protected abstract Object resolveName(String name,
                                      MethodParameter parameter,
                                      NativeWebRequest request)
                               throws Exception
```
    Resolve the given parameter type and value name into an argument value.
    参数:
    name - the name of the value being resolved
    parameter - the method parameter to resolve to an argument value (pre-nested in case of a Optional declaration)
    request - the current request
    返回:
    the resolved argument (may be null)
    抛出:
    Exception - in case of errors
  - handleMissingValue
```
protected void handleMissingValue(String name,
                                  MethodParameter parameter,
                                  NativeWebRequest request)
                           throws Exception
```
    Invoked when a named value is required, but resolveName(String, MethodParameter, NativeWebRequest) returned null and there is no default value. Subclasses typically throw an exception in this case.
    参数:
    name - the name for the value
    parameter - the method parameter
    request - the current request
    抛出:
    Exception
    从以下版本开始:
    4.3
  - handleMissingValue
```
protected void handleMissingValue(String name,
                                  MethodParameter parameter)
                           throws ServletException
```
    Invoked when a named value is required, but resolveName(String, MethodParameter, NativeWebRequest) returned null and there is no default value. Subclasses typically throw an exception in this case.
    参数:
    name - the name for the value
    parameter - the method parameter
    抛出:
    ServletException
  - handleResolvedValue
```
protected void handleResolvedValue(@Nullable
                                   Object arg,
                                   String name,
                                   MethodParameter parameter,
                                   @Nullable
                                   ModelAndViewContainer mavContainer,
                                   NativeWebRequest webRequest)
```
    Invoked after a value is resolved.
    参数:
    arg - the resolved argument value
    name - the argument name
    parameter - the argument parameter type
    mavContainer - the ModelAndViewContainer (may be null)
    webRequest - the current request

类 AbstractNamedValueMethodArgumentResolver

嵌套类概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

从接口继承的方法 org.springframework.web.method.support.HandlerMethodArgumentResolver

构造器详细资料

AbstractNamedValueMethodArgumentResolver

AbstractNamedValueMethodArgumentResolver

方法详细资料

resolveArgument

createNamedValueInfo

resolveName

handleMissingValue

handleMissingValue

handleResolvedValue