Mail-smtp-pop3（java收发邮件）

【实例简介】基于smtp协议和pop3协议代码发送邮件

【实例截图】

└─Mail-smtp-pop3
    │  .classpath
    │  .project
    │  
    ├─pop3
    │      POP3Demo.class
    │      POP3Demo.java
    │      
    └─smtp
            SMTPDemo.class
            SMTPDemo.java
            

【核心代码】package smtp;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

public class SMTPDemo {
String mailServer;
String from;
String pass;
String to;
String content;
String lineFeet = "\r\n";
private int port = 25;

Socket client;
BufferedReader in;
DataOutputStream os;

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content;
}

public String getMailServer() {
return mailServer;
}

public void setMailServer(String mailServer) {
this.mailServer = mailServer;
}

public String getFrom() {
return from;
}

public void setFrom(String from) {
this.from = from;
}

public String getPass() {
return pass;
}

public void setPass(String pass) {
this.pass = pass;
}

public String getTo() {
return to;
}

public void setTo(String to) {
this.to = to;
}

private boolean init() {
boolean boo = true;
if (mailServer == null || "".equals(mailServer)) {
return false;
}
try {
client = new Socket(mailServer, port);
in = new BufferedReader(new InputStreamReader(
client.getInputStream()));
os = new DataOutputStream(client.getOutputStream());
String isConnect = response();
if (isConnect.startsWith("220")) {

} else {
System.out.println("建立连接失败：" isConnect);
boo = false;
}
} catch (UnknownHostException e) {
System.out.println("建立连接失败！");
e.printStackTrace();
boo = false;
} catch (IOException e) {
System.out.println("读取流失败！");
e.printStackTrace();
boo = false;
}
return boo;
}

private String sendCommand(String msg) {
String result = null;
try {
os.writeBytes(msg);
os.flush();
result = response();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}

private String response() {
String result = null;
try {
result = in.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}

private void close() {
try {
os.close();
in.close();
client.close();
} catch (IOException e) {
e.printStackTrace();
}

}

public boolean sendMail() {

if (client == null) {
if (init()) {

} else {
return false;
}
}

if (from == null || from.isEmpty() || to == null || to.isEmpty()) {
return false;
}

String result = sendCommand("HELO " mailServer lineFeet);
if (isStartWith(result, "250")) {
} else {
System.out.println("握手失败：" result);
return false;
}

String auth = sendCommand("AUTH LOGIN" lineFeet);
if (isStartWith(auth, "334")) {
} else {
return false;
}
String user = sendCommand(new String(Base64.encode(from.getBytes()))
lineFeet);
if (isStartWith(user, "334")) {
} else {
return false;
}
String p = sendCommand(new String(Base64.encode(pass.getBytes()))
lineFeet);
if (isStartWith(p, "235")) {
} else {
return false;
}

String f = sendCommand("Mail From:<" from ">" lineFeet);
if (isStartWith(f, "250")) {
} else {
return false;
}
String toStr = sendCommand("RCPT TO:<" to ">" lineFeet);
if (isStartWith(toStr, "250")) {
} else {
return false;
}

String data = sendCommand("DATA" lineFeet);
if (isStartWith(data, "354")) {
} else {
return false;
}

StringBuilder sb = new StringBuilder();
sb.append("From:<" from ">" lineFeet);
sb.append("To:<" to ">" lineFeet);
sb.append("Subject:test" lineFeet);
sb.append("Date:2010/10/27 17:30" lineFeet);
sb.append("Content-Type:text/plain;charset=\"GB2312\"" lineFeet);
sb.append(lineFeet);
sb.append(content);
sb.append(lineFeet "." lineFeet);

String conStr = sendCommand(sb.toString());
if (isStartWith(conStr, "250")) {
} else {
return false;
}

String quit = sendCommand("QUIT" lineFeet);
if (isStartWith(quit, "221")) {
} else {
return false;
}
close();
return true;
}

private boolean isStartWith(String res, String with) {
return res.startsWith(with);
}

public static void main(String[] args) {
SMTPDemo mail = new SMTPDemo();
mail.setMailServer("smtp.qq.com");
mail.setFrom("393628134@qq.com");
mail.setPass("199169");
mail.setTo("285484657@qq.com");
mail.setContent("hello,my name is zhujiahao.");
boolean boo = mail.sendMail();
if (boo)
System.out.println("邮件发送成功！");
else {
System.out.println("邮件发送失败！");
}
}
}