使用字节[]和Java Mail发送电子邮件附件

创建一个 DataSource ByteArrayDataSource 来自JavaMail。

import java.io.*; 
import java.util.*; 
import javax.activation.*; 

public class BufferedDataSource implements DataSource { 

private byte[] _data; 
private java.lang.String _name; 

public BufferedDataSource(byte[] data, String name) { 
_data = data; 
_name = name;
} 

public String getContentType() { return "application/octet-stream";} 
public InputStream getInputStream() throws IOException { return new ByteArrayInputStream(_data);} 
public String getName() { return _name;} 

/** 
* Returns an OutputStream from the DataSource 
* @returns OutputStream Array of bytes converted into an OutputStream 
*/ 
public OutputStream getOutputStream() throws IOException { 
OutputStream out = new ByteArrayOutputStream(); 
out.write(_data); 
return out;
}
}
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//Getting ByteArray From BLOB
byte[] bytearray; 
BLOB blob = ((OracleResultSet) rs).getBLOB("IMAGE_GIF"); 
if (blob != null) { 
BufferedInputStream bis = new BufferedInputStream(blob.getBinaryStream()); 
ByteArrayOutputStream bao = new ByteArrayOutputStream(); 
byte[] buffer = new byte[4096]; 
int length = 0; 
while ((length = bis.read(buffer)) != -1) { 
bao.write(buffer, 0, length);
} 
bao.close(); 
bis.close(); 
bytearray = bao.toByteArray(); 
}
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//Attach File for mail
MimeBodyPart att = new MimeBodyPart(); 
BufferedDataSource bds = new BufferedDataSource(bytearray, "AttName"); 
att.setDataHandler(new DataHandler(bds)); 
att.setFileName(bds.getName());