URLDataSource (Java EE 5 SDK)

javax.activation Class URLDataSource

java.lang.Object
  javax.activation.URLDataSource

所有已实现的接口:

DataSource

public class URLDataSource

extends Object

implements DataSource

The URLDataSource class provides an object that wraps a URL object in a DataSource interface. URLDataSource simplifies the handling of data described by URLs within the JavaBeans Activation Framework because this class can be used to create new DataHandlers. NOTE: The DataHandler object creates a URLDataSource internally, when it is constructed with a URL.

另请参见:

DataSource, DataHandler

URLDataSource

public URLDataSource(URL url)

URLDataSource constructor. The URLDataSource class will not open a connection to the URL until a method requiring it to do so is called.

参数:

url - The URL to be encapsulated in this object.

getContentType

public String getContentType()

Returns the value of the URL content-type header field. It calls the URL's URLConnection.getContentType method after retrieving a URLConnection object. Note: this method attempts to call the openConnection method on the URL. If this method fails, or if a content type is not returned from the URLConnection, getContentType returns "application/octet-stream" as the content type.

规范说明:

getContentType in interface DataSource

返回:

the content type.

getName

public String getName()

Calls the getFile method on the URL used to instantiate the object.

规范说明:

getName in interface DataSource

返回:

the result of calling the URL's getFile method.

getInputStream

public InputStream getInputStream()
                           throws IOException

The getInputStream method from the URL. Calls the openStream method on the URL.

规范说明:

getInputStream in interface DataSource

返回:

the InputStream.

抛出异常:

IOException

getOutputStream

public OutputStream getOutputStream()
                             throws IOException

The getOutputStream method from the URL. First an attempt is made to get the URLConnection object for the URL. If that succeeds, the getOutputStream method on the URLConnection is returned.

规范说明:

getOutputStream in interface DataSource

返回:

the OutputStream.

抛出异常:

IOException

getURL

public URL getURL()

Return the URL used to create this DataSource.

返回:

The URL.

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