java.lang.Object
- org.springframework.http.codec.LoggingCodecSupport
- - org.springframework.http.codec.multipart.MultipartHttpMessageWriter

所有已实现的接口:
HttpMessageWriter<MultiValueMap<String,?>>
```
public class MultipartHttpMessageWriter
extends LoggingCodecSupport
implements HttpMessageWriter<MultiValueMap<String,?>>
```
HttpMessageWriter for writing a MultiValueMap<String, ?> as multipart form data, i.e. "multipart/form-data", to the body of a request.
The serialization of individual parts is delegated to other writers. By default only String and Resource parts are supported but you can configure others through a constructor argument.
This writer can be configured with a FormHttpMessageWriter to delegate to. It is the preferred way of supporting both form data and multipart data (as opposed to registering each writer separately) so that when the MediaType is not specified and generics are not present on the target element type, we can inspect the values in the actual map and decide whether to write plain form data (String values only) or otherwise.
从以下版本开始:
5.0
作者:
Sebastien Deleuze, Rossen Stoyanchev
另请参阅:
FormHttpMessageWriter

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
`MultipartHttpMessageWriter()`	Constructor with a default list of part writers (String and Resource).
`MultipartHttpMessageWriter(List<HttpMessageWriter<?>> partWriters)`	Constructor with explicit list of writers for serializing parts.
`MultipartHttpMessageWriter(List<HttpMessageWriter<?>> partWriters, HttpMessageWriter<MultiValueMap<String,String>> formWriter)`	Constructor with explicit list of writers for serializing parts and a writer for plain form data to fall back when no media type is specified and the actual map consists of String values only.

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.
`protected byte[]`	`generateMultipartBoundary()`	Generate a multipart boundary.
`Charset`	`getCharset()`	Return the configured charset for part headers.
`HttpMessageWriter<MultiValueMap<String,String>>`	`getFormWriter()`	Return the configured form writer.
`List<HttpMessageWriter<?>>`	`getPartWriters()`	Return the configured part writers.
`List<MediaType>`	`getWritableMediaTypes()`	Return the `MediaType`'s that this writer supports.
`void`	`setCharset(Charset charset)`	Set the character set to use for part headers such as "Content-Disposition" (and its filename parameter).
`reactor.core.publisher.Mono<Void>`	`write(org.reactivestreams.Publisher<? extends MultiValueMap<String,?>> inputStream, ResolvableType elementType, MediaType mediaType, ReactiveHttpOutputMessage outputMessage, 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
  - MultipartHttpMessageWriter
```
public MultipartHttpMessageWriter()
```
    Constructor with a default list of part writers (String and Resource).
  - MultipartHttpMessageWriter
```
public MultipartHttpMessageWriter(List<HttpMessageWriter<?>> partWriters)
```
    Constructor with explicit list of writers for serializing parts.
  - MultipartHttpMessageWriter
```
public MultipartHttpMessageWriter(List<HttpMessageWriter<?>> partWriters,
                                  @Nullable
                                  HttpMessageWriter<MultiValueMap<String,String>> formWriter)
```
    Constructor with explicit list of writers for serializing parts and a writer for plain form data to fall back when no media type is specified and the actual map consists of String values only.
    参数:
    partWriters - the writers for serializing parts
    formWriter - the fallback writer for form data, null by default
- 方法详细资料
  - getPartWriters
```
public List<HttpMessageWriter<?>> getPartWriters()
```
    Return the configured part writers.
    从以下版本开始:
    5.0.7
  - getFormWriter
```
@Nullable
public HttpMessageWriter<MultiValueMap<String,String>> getFormWriter()
```
    Return the configured form writer.
    从以下版本开始:
    5.1.13
  - setCharset
```
public void setCharset(Charset charset)
```
    Set the character set to use for part headers such as "Content-Disposition" (and its filename parameter).
    By default this is set to "UTF-8".
  - getCharset
```
public Charset getCharset()
```
    Return the configured charset for part headers.
  - 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,?>>
  - 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,?>>
    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,?>> inputStream,
                                               ResolvableType elementType,
                                               @Nullable
                                               MediaType mediaType,
                                               ReactiveHttpOutputMessage outputMessage,
                                               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,?>>
    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)
    outputMessage - the message to write to
    hints - additional information about how to encode and write
    返回:
    indicates completion or error
  - generateMultipartBoundary
```
protected byte[] generateMultipartBoundary()
```
    Generate a multipart boundary.
    By default delegates to MimeTypeUtils.generateMultipartBoundary().

类 MultipartHttpMessageWriter

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

MultipartHttpMessageWriter

MultipartHttpMessageWriter

MultipartHttpMessageWriter

方法详细资料

getPartWriters

getFormWriter

setCharset

getCharset

getWritableMediaTypes

canWrite

write

generateMultipartBoundary