Multipart (Java EE 5 SDK)

javax.mail Class Multipart

java.lang.Object
  javax.mail.Multipart

直接已知子类:

MimeMultipart

public abstract class Multipart

extends Object

Multipart is a container that holds multiple body parts. Multipart provides methods to retrieve and set its subparts.

Multipart also acts as the base class for the content object returned by most Multipart DataContentHandlers. For example, invoking getContent() on a DataHandler whose source is a "multipart/signed" data source may return an appropriate subclass of Multipart.

Some messaging systems provide different subtypes of Multiparts. For example, MIME specifies a set of subtypes that include "alternative", "mixed", "related", "parallel", "signed", etc.

Multipart is an abstract class. Subclasses provide actual implementations.

版本:

1.16, 07/05/04

作者:

John Mani

parts

protected Vector parts

Vector of BodyPart objects.

contentType

protected String contentType

This field specifies the content-type of this multipart object. It defaults to "multipart/mixed".

parent

protected Part parent

The Part containing this Multipart, if known.

从以下版本开始:

JavaMail 1.1

Multipart

protected Multipart()

Default constructor. An empty Multipart object is created.

setMultipartDataSource

protected void setMultipartDataSource(MultipartDataSource mp)
                               throws MessagingException

Setup this Multipart object from the given MultipartDataSource.

The method adds the MultipartDataSource's BodyPart objects into this Multipart. This Multipart's contentType is set to that of the MultipartDataSource.

This method is typically used in those cases where one has a multipart data source that has already been pre-parsed into the individual body parts (for example, an IMAP datasource), but needs to create an appropriate Multipart subclass that represents a specific multipart subtype.

参数:

mp - Multipart datasource

抛出异常:

MessagingException

getContentType

public String getContentType()

Return the content-type of this Multipart.

This implementation just returns the value of the contentType field.

返回:

content-type

另请参见:

contentType

getCount

public int getCount()
             throws MessagingException

Return the number of enclosed BodyPart objects.

返回:

number of parts

抛出异常:

MessagingException

另请参见:

parts

getBodyPart

public BodyPart getBodyPart(int index)
                     throws MessagingException

Get the specified Part. Parts are numbered starting at 0.

参数:

index - the index of the desired Part

返回:

the Part

抛出异常:

IndexOutOfBoundsException - if the given index is out of range.

MessagingException

removeBodyPart

public boolean removeBodyPart(BodyPart part)
                       throws MessagingException

Remove the specified part from the multipart message. Shifts all the parts after the removed part down one.

参数:

part - The part to remove

返回:

true if part removed, false otherwise

抛出异常:

MessagingException - if no such Part exists

IllegalWriteException - if the underlying implementation does not support modification of existing values

removeBodyPart

public void removeBodyPart(int index)
                    throws MessagingException

Remove the part at specified location (starting from 0). Shifts all the parts after the removed part down one.

参数:

index - Index of the part to remove

抛出异常:

MessagingException

IndexOutOfBoundsException - if the given index is out of range.

IllegalWriteException - if the underlying implementation does not support modification of existing values

addBodyPart

public void addBodyPart(BodyPart part)
                 throws MessagingException

Adds a Part to the multipart. The BodyPart is appended to the list of existing Parts.

参数:

part - The Part to be appended

抛出异常:

MessagingException

IllegalWriteException - if the underlying implementation does not support modification of existing values

addBodyPart

public void addBodyPart(BodyPart part,
                        int index)
                 throws MessagingException

Adds a BodyPart at position index. If index is not the last one in the list, the subsequent parts are shifted up. If index is larger than the number of parts present, the BodyPart is appended to the end.

参数:

part - The BodyPart to be inserted

index - Location where to insert the part

抛出异常:

MessagingException

IllegalWriteException - if the underlying implementation does not support modification of existing values

writeTo

public abstract void writeTo(OutputStream os)
                      throws IOException,
                             MessagingException

Output an appropriately encoded bytestream to the given OutputStream. The implementation subclass decides the appropriate encoding algorithm to be used. The bytestream is typically used for sending.

抛出异常:

IOException - if an IO related exception occurs

MessagingException

getParent

public Part getParent()

Return the Part that contains this Multipart object, or null if not known.

从以下版本开始:

JavaMail 1.1

setParent

public void setParent(Part parent)

Set the parent of this Multipart to be the specified Part. Normally called by the Message or BodyPart setContent(Multipart) method. parent may be null if the Multipart is being removed from its containing Part.

从以下版本开始:

JavaMail 1.1

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