DataSource (Java EE 5)

DataSource 接口为 JavaBeans Activation Framework 提供任意数据集合的抽象。它提供该数据的类型，并在适当的时候以 InputStream 和 OutputStream 的形式提供对该数据的访问。 英文文档：

The DataSource interface provides the JavaBeans Activation Framework with an abstraction of an arbitrary collection of data. It provides a type for that data as well as access to it in the form of InputStreams and OutputStreams where appropriate.

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Method Summary
String	getContentType()           This method returns the MIME type of the data in the form of a string.
InputStream	getInputStream()           This method returns an InputStream representing the data and throws the appropriate exception if it can not do so.
String	getName()           Return the name of this object where the name of the object is dependant on the nature of the underlying objects.
OutputStream	getOutputStream()           This method returns an OutputStream where the data can be written and throws the appropriate exception if it can not do so.

 

Method Detail

public java.io.InputStream getInputStream() throws java.io.IOException
此方法返回一个表示数据的 InputStream；如果无法提供，则抛出适当的异常。注意，每次调用此方法时都必须返回一个新的 InputStream 对象，并且流必须位于数据的开始位置。

return

InputStream

英文文档：

getInputStream

InputStream getInputStream()
                           throws IOException

This method returns an InputStream representing the data and throws the appropriate exception if it can not do so. Note that a new InputStream object must be returned each time this method is called, and the stream must be positioned at the beginning of the data.

Returns:

an InputStream

Throws:

IOException

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public java.io.OutputStream getOutputStream() throws java.io.IOException
此方法返回一个可以写入数据的 OutputStream，如果无法返回，则抛出适当的异常。注意，每次调用此方法时都必须返回一个新的 OutputStream 对象，并且流必须位于要写入数据的位置。

return

OutputStream

英文文档：

getOutputStream

OutputStream getOutputStream()
                             throws IOException

This method returns an OutputStream where the data can be written and throws the appropriate exception if it can not do so. Note that a new OutputStream object must be returned each time this method is called, and the stream must be positioned at the location the data is to be written.

Returns:

an OutputStream

Throws:

IOException

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public String getContentType()
此方法以字符串形式返回数据的 MIME 类型。应该始终返回有效类型。如果 DataSource 实现不能确定数据类型，则建议 getContentType 返回 "application/octet-stream"。

return

MIME 类型

英文文档：

getContentType

String getContentType()

This method returns the MIME type of the data in the form of a string. It should always return a valid type. It is suggested that getContentType return "application/octet-stream" if the DataSource implementation can not determine the data type.

Returns:

the MIME Type

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public String getName()
返回此对象的名称，其中对象的名称依赖于底层对象的特性。封装文件的 DataSources 可以选择返回对象的文件名。(通常，这是文件名的最后部分，并不是完整路径名。)

return

对象的名称。

英文文档：

getName

String getName()

Return the name of this object where the name of the object is dependant on the nature of the underlying objects. DataSources encapsulating files may choose to return the filename of the object. (Typically this would be the last component of the filename, not an entire pathname.)

Returns:

the name of the object.

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