我已将图像存储在sql server数据库中。我需要获取它们并通过电子邮件发送它们。有没有办法将图像存储在变量中并将其发送到电子邮件正文中。
以下是从系统路径上传图片的代码
public class ImageInsert {
private static java.sql.Date getCurrentDate() {
java.util.Date today = new java.util.Date();
return new java.sql.Date(today.getTime());
}
public void insertImage() {
// declare a connection by using Connection interface
Connection connection = null;
/* Create string of connection url within specified format with machine
name, port number and database name. Here machine name id localhost
and database name is Test. */
String connectionURL = "jdbc:sqlserver://127.0.0.1:1433;databaseName=Test";
/*declare a resultSet that works as a table resulted by execute a specified
sql query. */
ResultSet rs = null;
// Declare prepare statement.
PreparedStatement psmnt = null;
// declare FileInputStream object to store binary stream of given image.
FileInputStream fis;
try {
// Load JDBC driver "com.mysql.jdbc.Driver"
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
/* Create a connection by using getConnection() method that takes
parameters of string type connection url, user name and password to
connect to database. */
connection = DriverManager.getConnection(connectionURL, "sa", "$arat0ga~");
// create a file object for image by specifying full path of image as parameter.
File media = new File("C:/HBD.jpg");
/* prepareStatement() is used for create statement object that is
used for sending sql statements to the specified database. */
psmnt = connection.prepareStatement("insert into WishEmail(filename, media, date ) " + "values(?,?,?)");
psmnt.setString(1, "Happy Birthday");
psmnt.setDate(3, getCurrentDate());
fis = new FileInputStream(media);
psmnt.setBinaryStream(2, (InputStream) fis, (int)(media.length()));
/* executeUpdate() method execute specified sql query. Here this query
insert data and image from specified address. */
int s = psmnt.executeUpdate();
if (s > 0) {
System.out.println("Uploaded successfully !");
} else {
System.out.println("unsucessfull to upload image.");
}
}
// catch if found any exception during rum time.
catch (Exception ex) {
System.out.println("Found some error : " + ex);
} finally {
//finally block used to close resources
try{
if(psmnt!=null)
connection.close();
}catch(SQLException se){
}// do nothing
try{
if(connection!=null)
connection.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}
}
它以二进制格式存储在db中 这是插入db
的代码public class DB {
public DB() {}
public Connection dbConnect(String db_connect_string,
String db_userid, String db_password)
{
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn = DriverManager.getConnection(
db_connect_string, db_userid, db_password);
System.out.println("connected");
return conn;
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
}
public void insertImage(Connection conn,String img)
{
int len;
String query;
PreparedStatement pstmt;
try
{
File file = new File(img);
FileInputStream fis = new FileInputStream(file);
len = (int)file.length();
query = ("insert into WishEmail VALUES(?,?,?)");
pstmt = conn.prepareStatement(query);
pstmt.setString(1,file.getName());
pstmt.setInt(2, len);
// Method used to insert a stream of bytes
pstmt.setBinaryStream(3, fis, len);
pstmt.executeUpdate();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public void getImageData(Connection conn)
{
byte[] fileBytes;
String query;
try
{
query = "select image from WishEmail";
Statement state = conn.createStatement();
ResultSet rs = state.executeQuery(query);
if (rs.next())
{
fileBytes = rs.getBytes(1);
OutputStream targetFile=
new FileOutputStream(
"C:/DEF.jpg");
targetFile.write(fileBytes);
targetFile.close();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
以下是发送电子邮件的代码
public class Mail {
public void sendEmail() throws IOException
{
GetPropsValue props = new GetPropsValue();
props.getPropValues();
String replyTo= props.toAddress1;
String mailFrom = props.fromAddress1;
String smtpHost = props.smtpHost1;
//Get the session object
Properties properties = System.getProperties();
properties.setProperty("mail.smtp.host", smtpHost);
properties.setProperty("replyTo", replyTo);
properties.setProperty("mailFrom",mailFrom);
Session session = Session.getDefaultInstance(properties);
generateAndSendEmail(
session,
replyTo,
mailFrom,
"Email for Birthday Wishes",
"Greetings, <br><br>Happy Birthday.");
}
public static void generateAndSendEmail(Session session, String toEmail,String mailFrom, String subject, String body) {
//compose the message
try{
System.out.println("\n ===> generateAndSendEmail() starts..");
MimeMessage mime1 = new MimeMessage(session);
mime1.addHeader("Content-type", "text/HTML; charset=UTF-8");
mime1.addHeader("format", "flowed");
mime1.addHeader("Content-Transfer-Encoding", "8bit");
mime1.setFrom(new InternetAddress(mailFrom,toEmail));
mime1.setSubject(subject, "UTF-8");
mime1.setSentDate(new Date());
mime1.setRecipients(Message.RecipientType.TO,InternetAddress.parse(toEmail, false));
// Create the message body part
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(body, "text/html");
// Create a multipart message for attachment
Multipart multipart = new MimeMultipart();
// Set text message part
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
// Valid file location
String filename = "C:/ABC.jpg";
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
// Trick is to add the content-id header here
messageBodyPart.setHeader("Content-ID", "image_id");
multipart.addBodyPart(messageBodyPart);
System.out.println("\n ===> third part for displaying image in the email body..");
messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent("<br><h3>Happy Birthday</h3>"
+ "<img src='cid:image_id'>", "text/html");
multipart.addBodyPart(messageBodyPart);
mime1.setContent(multipart);
messageBodyPart.setContent("<br><h3>Regards</h3>", "text/html");
System.out.println("\n ===> Finally Send message..");
// Finally Send message
Transport.send(mime1);
System.out
.println("\n ===> Email Sent Successfully With Image Attachment. Check your email now..");
System.out.println("\n ===> generateAndSendEmail() ends..");
} catch (MessagingException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
答案 0 :(得分：1)
短期内我告诉你!!!! 首先创建表格，然后添加列图像网址并在此处保存图像网址，当您获取详细信息时，也可以获取它并在Label上设置
答案 1 :(得分：0)
使用以下代码将图像转换为BASE64字符串。
byte[] encodedBytes = null;
String contents = "";
Scanner scanner = null;
StringBuilder text = new StringBuilder();
String NL = System.getProperty("line.separator");
try {
encodedBytes = new Base64().encode(FileUtils.readFileToByteArray(new File(fFileName)));
contents = new String(encodedBytes);
}catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally{
}
return "data:image/png;base64,"+contents;