PreencodedMimeBodyPart (Java EE 5)

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javax.mail.internet Class PreencodedMimeBodyPart

java.lang.Object
  javax.mail.BodyPart
      javax.mail.internet.MimeBodyPart
          javax.mail.internet.PreencodedMimeBodyPart

All Implemented Interfaces:: MimePart, Part

public class PreencodedMimeBodyPart
extends MimeBodyPart

Extends: BodyPart > MimeBodyPart

处理已编码数据的 MimeBodyPart。此类在构造消息并附加已编码（例如，使用 base64 编码）数据时很有用。数据可能已经通过应用程序进行编码，也可能已经以编码形式存储在文件或数据库中。在创建此对象时提供编码。数据通过使用 setText、setContent 或 setDataHandler 方法以常规方式连接到此对象。

since

JavaMail 1.4

英文文档：

A MimeBodyPart that handles data that has already been encoded. This class is useful when constructing a message and attaching data that has already been encoded (for example, using base64 encoding). The data may have been encoded by the application, or may have been stored in a file or database in encoded form. The encoding is supplied when this object is created. The data is attached to this object in the usual fashion, by using the setText, setContent, or setDataHandler methods.

Since:: JavaMail 1.4

Field Summary

Fields inherited from class javax.mail.internet.MimeBodyPart
`content, contentStream, dh, headers`

Fields inherited from class javax.mail.BodyPart
`parent`

Fields inherited from interface javax.mail.Part
`ATTACHMENT, INLINE`

Constructor Summary
`PreencodedMimeBodyPart(String encoding)` Create a PreencodedMimeBodyPart that assumes the data is encoded using the specified encoding.

Method Summary
`String`	`getEncoding()` Returns the content transfer encoding specified when this object was created.
`protected void`	`updateHeaders()` Force the `Content-Transfer-Encoding` header to use the encoding that was specified when this object was created.
`void`	`writeTo(OutputStream os)` Output the body part as an RFC 822 format stream.

Methods inherited from class javax.mail.internet.MimeBodyPart
addHeader, addHeaderLine, attachFile, attachFile, getAllHeaderLines, getAllHeaders, getContent, getContentID, getContentLanguage, getContentMD5, getContentStream, getContentType, getDataHandler, getDescription, getDisposition, getFileName, getHeader, getHeader, getInputStream, getLineCount, getMatchingHeaderLines, getMatchingHeaders, getNonMatchingHeaderLines, getNonMatchingHeaders, getRawInputStream, getSize, isMimeType, removeHeader, saveFile, saveFile, setContent, setContent, setContentID, setContentLanguage, setContentMD5, setDataHandler, setDescription, setDescription, setDisposition, setFileName, setHeader, setText, setText, setText

Methods inherited from class javax.mail.internet.MimeBodyPart

addHeader, addHeaderLine, attachFile, attachFile, getAllHeaderLines, getAllHeaders, getContent, getContentID, getContentLanguage, getContentMD5, getContentStream, getContentType, getDataHandler, getDescription, getDisposition, getFileName, getHeader, getHeader, getInputStream, getLineCount, getMatchingHeaderLines, getMatchingHeaders, getNonMatchingHeaderLines, getNonMatchingHeaders, getRawInputStream, getSize, isMimeType, removeHeader, saveFile, saveFile, setContent, setContent, setContentID, setContentLanguage, setContentMD5, setDataHandler, setDescription, setDescription, setDisposition, setFileName, setHeader, setText, setText, setText

Methods inherited from class javax.mail.BodyPart
`getParent`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

public PreencodedMimeBodyPart(String encoding)
创建一个 PreencodedMimeBodyPart，它假定数据使用指定的编码进行编码。编码必须是支持 MIME 的 Content-Transfer-Encoding。

英文文档：
PreencodedMimeBodyPart

public PreencodedMimeBodyPart(String encoding)

Create a PreencodedMimeBodyPart that assumes the data is encoded using the specified encoding. The encoding must be a MIME supported Content-Transfer-Encoding.

Method Detail

public String getEncoding() throws MessagingException
返回创建此对象时所指定的内容传输编码。

英文文档：
getEncoding

public String getEncoding()
                   throws MessagingException

Returns the content transfer encoding specified when this object was created.

Specified by:: getEncoding in interface MimePart
Overrides:: getEncoding in class MimeBodyPart

Returns:: content-transfer-encoding
Throws:: MessagingException
See Also:: MimeBodyPart.headers

public void writeTo(java.io.OutputStream os) throws java.io.IOException, MessagingException
以 RFC 822 格式流的形式输出正文部分。

Throws MessagingException:

Throws java.io.IOException: 如果写入流时发生错误，或者 javax.activation 层发生错误。

See also writeTo

英文文档：
writeTo

public void writeTo(OutputStream os)
             throws IOException,
                    MessagingException

Output the body part as an RFC 822 format stream.

Specified by:: writeTo in interface Part
Overrides:: writeTo in class MimeBodyPart

Throws:: MessagingException; IOException - if an error occurs writing to the stream or if an error is generated by the javax.activation layer.
See Also:: DataHandler.writeTo(java.io.OutputStream)

protected void updateHeaders() throws MessagingException
强制 `Content-Transfer-Encoding` 头使用创建此对象时所指定的编码。

英文文档：
updateHeaders

protected void updateHeaders()
                      throws MessagingException

Force the Content-Transfer-Encoding header to use the encoding that was specified when this object was created.

Overrides:: updateHeaders in class MimeBodyPart

Throws:: MessagingException