One 、 Platform Overview

JavaEE The full name is Java Enterprise Edition, It's a specification and standard for developing distributed enterprise applications

Java Three versions of the platform :

  • Java ME(Java  Micro  Edition)Java Miniature version
  • Java SE(Java Standard Edition)Java The standard version
  • Java EE(Java Enterprise Edition) Java Enterprise Edition

Two 、 Architecture Overview

Java EE The server :

Java EE The server provides deployment for standard application components , Management and operation support

According to what you depend on Of Java EE The server , Application components can be divided into 3 class .

  • Deploy , Manage and run in Java EE Components on the server .(Web Components and Ejb Components )
  • Deployment and management in Java EE Server , But the running components loaded into the client .(Html Pages and embedded pages Applet Of Web resources )
  • Deployment and management are not fully defined in Java EE Components in the specification .( Application client )

3、 ... and 、 Container Overview

A container for Java EE Application components provide a running environment .

The container provides a copy from the bottom Java EE Api To a federated view of application components .

In application components and Java EE Add a container between services , You can let the container transparently inject necessary services into the component .

A standard Java EE The product will define the component type for each application , Provide a container .

Container Overview :

A container is a collection tool for managing component behavior , The behavior of a component includes interaction with the external environment 、 Life cycle of components 、 Cooperation and dependency between components, etc

Java EE Containers :

  • Application client container : Contains the components Application Client
  • Applet Containers : Contains the components Applet
  • Web Component containers : contain Jsp And Servlet Components
  • Enterprises Bean Containers : That is to say EJB Containers , Contains EJB Components

Four 、 service

  summary : Services are between components and containers , And containers and Java EE Interface between servers

5、 ... and 、 Common services

JNDI Acquisition data source

<Resource auth="Container" driverClassName="oracle.jdbc.OracleDriver"
maxActive="100" maxIdle="30" maxWaite="10000" name="jdbc/jndi"
password="accp" type="javax.sql.DataSource" url="jdbc:oracle:thin:@localhost:1521:orcl"
username="accp" />
/**
* adopt JNDI Get the connection
*/
public Connection getConnection(){
Connection conn=null; try {
// Declare the context object
Context ct=new InitialContext();
// Declare data source
DataSource ds=(DataSource) ct.lookup("java:comp/env/jdbc/jndi");
// Get connected
conn=ds.getConnection();
} catch (NamingException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn; }

mail

package com;

import java.util.Properties;

import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart; /**
* Send E-mail
*
*/
public class Mail { private MimeMessage mimeMsg;
private Session session;
private Properties props;
private String username;
private String password;
private Multipart mp; public Mail(String smtp){
setSmtpHost(smtp);
createMimeMessage();
} public void setSmtpHost(String hostName){
System.out.println(" Set system properties :mail.smtp.host="+hostName);
if(props==null){
props = System.getProperties();
}
props.put("mail.smtp.host", hostName);
} public boolean createMimeMessage(){
try{
System.out.println(" Ready to get mail session object !");
session = Session.getDefaultInstance(props,null);
}catch(Exception e){
System.out.println(" Error getting mail session object !"+e);
return false;
}
System.out.println(" Ready to create MIME Mail to !");
try{
mimeMsg = new MimeMessage(session);
mp = new MimeMultipart(); return true;
}catch(Exception e){
System.out.println(" establish MIME Mail object failed !"+e);
return false;
}
}
/**
* Set up SMTP Is it necessary to verify
*/
public void setNeedAuth(boolean need) {
System.out.println(" Set up smtp Identity Authentication :mail.smtp.auth = "+need);
if(props == null) props = System.getProperties();
if(need){
props.put("mail.smtp.auth","true");
}else{
props.put("mail.smtp.auth","false");
}
} public void setNamePass(String name,String pass) {
username = name;
password = pass;
} /**
* Set up email subject
*/
public boolean setSubject(String mailSubject) {
System.out.println(" Set up email subject !");
try{
mimeMsg.setSubject(mailSubject);
return true;
}
catch(Exception e) {
System.err.println(" There was an error setting the subject of the message !");
return false;
}
} /**
* Set the message body
*/
public boolean setBody(String mailBody) {
try{
BodyPart bp = new MimeBodyPart();
bp.setContent(""+mailBody,"text/html;charset=GBK");
mp.addBodyPart(bp); return true;
} catch(Exception e){
System.err.println(" Error setting message body !"+e);
return false;
}
} /**
* Set the sender
*/
public boolean setFrom(String from) {
System.out.println(" Set the sender !");
try{
mimeMsg.setFrom(new InternetAddress(from)); // Set the sender
return true;
} catch(Exception e) {
return false;
}
}
/**
* Set up recipients
*/
public boolean setTo(String to){
if(to == null)return false;
System.out.println(" Set up recipients !");
try{
mimeMsg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
return true;
} catch(Exception e) {
return false;
}
} /**
* Set CC person
*/
public boolean setCopyTo(String copyto)
{
if(copyto == null)return false;
try{
mimeMsg.setRecipients(Message.RecipientType.CC,(Address[])InternetAddress.parse(copyto));
return true;
}
catch(Exception e)
{ return false; }
} /**
* Send E-mail
*/
public boolean sendOut()
{
try{
mimeMsg.setContent(mp);
mimeMsg.saveChanges();
System.out.println(" Sending mail ...."); Session mailSession = Session.getInstance(props,null);
Transport transport = mailSession.getTransport("smtp");
transport.connect((String)props.get("mail.smtp.host"),username,password);
transport.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.TO)); System.out.println(" Email sent successfully !");
transport.close(); return true;
} catch(Exception e) {
System.err.println(" Failed to send mail !"+e);
return false;
}
} /**
* call sendOut Method to complete the email
*/
public static boolean sendAndCc(String smtp,String from,String to,String copyto,String subject,String content,String username,String password) {
Mail theMail = new Mail(smtp);
theMail.setNeedAuth(true); // Need to verify if(!theMail.setSubject(subject)) return false;
if(!theMail.setBody(content)) return false;
if(!theMail.setTo(to)) return false;
if(!theMail.setCopyTo(copyto)) return false;
if(!theMail.setFrom(from)) return false;
theMail.setNamePass(username,password); if(!theMail.sendOut()) return false;
return true;
}
}

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