java.lang.Object
- org.springframework.http.codec.LoggingCodecSupport
- - org.springframework.http.codec.FormHttpMessageWriter

所有已实现的接口:
HttpMessageWriter<MultiValueMap<String,String>>
```
public class FormHttpMessageWriter
extends LoggingCodecSupport
implements HttpMessageWriter<MultiValueMap<String,String>>
```
HttpMessageWriter for writing a MultiValueMap<String, String> as HTML form data, i.e. "application/x-www-form-urlencoded", to the body of a request.
Note that unless the media type is explicitly set to MediaType.APPLICATION_FORM_URLENCODED, the canWrite(org.springframework.core.ResolvableType, org.springframework.http.MediaType) method will need generic type information to confirm the target map has String values. This is because a MultiValueMap with non-String values can be used to write multipart requests.
To support both form data and multipart requests, consider using MultipartHttpMessageWriter configured with this writer as the fallback for writing plain form data.
从以下版本开始:
5.0
作者:
Sebastien Deleuze, Rossen Stoyanchev
另请参阅:
MultipartHttpMessageWriter

字段概要
字段
修饰符和类型字段说明
static Charset DEFAULT_CHARSET
The default charset used by the writer.
- 从类继承的字段 org.springframework.http.codec.LoggingCodecSupport
  logger

构造器概要
构造器
构造器说明
FormHttpMessageWriter()

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`boolean`	`canWrite(ResolvableType elementType, MediaType mediaType)`	Whether the given object type is supported by this writer.
`Charset`	`getDefaultCharset()`	Return the configured default charset.
`protected MediaType`	`getMediaType(MediaType mediaType)`
`List<MediaType>`	`getWritableMediaTypes()`	Return the `MediaType`'s that this writer supports.
`protected String`	`serializeForm(MultiValueMap<String,String> formData, Charset charset)`
`void`	`setDefaultCharset(Charset charset)`	Set the default character set to use for writing form data when the response Content-Type header does not explicitly specify it.
`reactor.core.publisher.Mono<Void>`	`write(org.reactivestreams.Publisher<? extends MultiValueMap<String,String>> inputStream, ResolvableType elementType, MediaType mediaType, ReactiveHttpOutputMessage message, Map<String,Object> hints)`	Write an given stream of object to the output message.

从类继承的方法 org.springframework.http.codec.LoggingCodecSupport
isEnableLoggingRequestDetails, setEnableLoggingRequestDetails

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.http.codec.HttpMessageWriter
write

- 字段详细资料
  - DEFAULT_CHARSET
```
public static final Charset DEFAULT_CHARSET
```
    The default charset used by the writer.
- 构造器详细资料
  - FormHttpMessageWriter
```
public FormHttpMessageWriter()
```
- 方法详细资料
  - setDefaultCharset
```
public void setDefaultCharset(Charset charset)
```
    Set the default character set to use for writing form data when the response Content-Type header does not explicitly specify it.
    By default this is set to "UTF-8".
  - getDefaultCharset
```
public Charset getDefaultCharset()
```
    Return the configured default charset.
  - getWritableMediaTypes
```
public List<MediaType> getWritableMediaTypes()
```
    从接口复制的说明: HttpMessageWriter
    Return the MediaType's that this writer supports.
    指定者:
    getWritableMediaTypes 在接口中 HttpMessageWriter<MultiValueMap<String,String>>
  - canWrite
```
public boolean canWrite(ResolvableType elementType,
                        @Nullable
                        MediaType mediaType)
```
    从接口复制的说明: HttpMessageWriter
    Whether the given object type is supported by this writer.
    指定者:
    canWrite 在接口中 HttpMessageWriter<MultiValueMap<String,String>>
    参数:
    elementType - the type of object to check
    mediaType - the media type for the write (possibly null)
    返回:
    true if writable, false otherwise
  - write
```
public reactor.core.publisher.Mono<Void> write(org.reactivestreams.Publisher<? extends MultiValueMap<String,String>> inputStream,
                                               ResolvableType elementType,
                                               @Nullable
                                               MediaType mediaType,
                                               ReactiveHttpOutputMessage message,
                                               Map<String,Object> hints)
```
    从接口复制的说明: HttpMessageWriter
    Write an given stream of object to the output message.
    指定者:
    write 在接口中 HttpMessageWriter<MultiValueMap<String,String>>
    参数:
    inputStream - the objects to write
    elementType - the type of objects in the stream which must have been previously checked via HttpMessageWriter.canWrite(ResolvableType, MediaType)
    mediaType - the content type for the write (possibly null to indicate that the default content type of the writer must be used)
    message - the message to write to
    hints - additional information about how to encode and write
    返回:
    indicates completion or error
  - getMediaType
```
protected MediaType getMediaType(@Nullable
                                 MediaType mediaType)
```
  - serializeForm
```
protected String serializeForm(MultiValueMap<String,String> formData,
                               Charset charset)
```

类 FormHttpMessageWriter

字段概要

从类继承的字段 org.springframework.http.codec.LoggingCodecSupport

构造器概要

方法概要

从类继承的方法 org.springframework.http.codec.LoggingCodecSupport

从类继承的方法 java.lang.Object

从接口继承的方法 org.springframework.http.codec.HttpMessageWriter

字段详细资料

DEFAULT_CHARSET

构造器详细资料

FormHttpMessageWriter

方法详细资料

setDefaultCharset

getDefaultCharset

getWritableMediaTypes

canWrite

write

getMediaType

serializeForm