Socket发送邮件

package com.test.mail; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.PrintWriter; 
import java.io.Reader; 
import java.net.Socket; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 

import org.apache.commons.codec.binary.Base64; 

public class Mail { 

public static void main(String[] args) throws IOException { 
String date = String.format("%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS", new Date()); 
System.out.println(date); 

// Mail mail = new Mail(); 
// mail.setSmtpServer("smtp.qq.com"); 
// mail.setFromMail(" 98 ******[email protected] "); 
// mail.addToMail(" 84 ******[email protected] "); 
// mail.addToMail(" c ******[email protected] "); 
// mail.setUserName(" 98 ******@qq.com "); 
// mail.setPassword("******"); 
// mail.setSubject("测试邮件"); 
// mail.setContent("

你好

https://www.baidu.com/img/baidu_jgylogo3.gif?v=39549282.gif \" />"); 
// mail.setShowLog(true); 
// mail.send(); 
// System.out.println("程序结束"); 
} 

/** 邮件主题 **/ 
private String subject; 
/** 从此地址发出 **/ 
private String fromMail; 
/** 用户名 **/ 
private String userName; 
/** 登录密码 **/ 
private String password; 
/** SMTP 服务器地址 **/ 
private String smtpServer; 
/** SMTP 服务器端口（默认：25） **/ 
private int smtpPort = 25; 
/** 发送到 toMail 中的所有地址 **/ 
private List toMail; 
/** 邮件内容 **/ 
private String content; 
/** 是否显示日志 **/ 
private boolean showLog; 

public void addToMail(String mail) { 
if (toMail == null) 
toMail = new ArrayList(); 
toMail.add(mail); 
} 

public void send() { 
if (smtpServer == null) { 
throw new RuntimeException("smtpServer 不能为空"); 
} 
if (userName == null) { 
throw new RuntimeException("userName 不能为空"); 
} 
if (password == null) { 
throw new RuntimeException("password 不能为空"); 
} 
if (fromMail == null) { 
throw new RuntimeException("fromMail 不能为空"); 
} 
if (toMail == null || toMail.isEmpty()) { 
throw new RuntimeException("toMail 不能为空"); 
} 
if (content == null || toMail.isEmpty()) { 
throw new RuntimeException("content 不能为空"); 
} 

Socket socket = null; 
InputStream in = null; 
OutputStream out = null; 
try { 
socket = new Socket(smtpServer, smtpPort); 
socket.setSoTimeout(3000); 
in = socket.getInputStream(); 
out = socket.getOutputStream(); 
} catch (IOException e) { 
throw new RuntimeException("连接到 " + smtpServer + ":" + smtpPort + " 失败", e); 
} 

BufferedReaderProxy reader = new BufferedReaderProxy(new InputStreamReader(in), showLog); 
PrintWriterProxy writer = new PrintWriterProxy(out, showLog); 

reader.showResponse(); 
writer.println("HELO " + smtpServer); 
reader.showResponse(); 
writer.println("AUTH LOGIN"); 
reader.showResponse(); 
writer.println(new String(Base64.encodeBase64(userName.getBytes()))); 
reader.showResponse(); 
writer.println(new String(Base64.encodeBase64(password.getBytes()))); 
reader.showResponse(); 
writer.println("MAIL FROM:" + fromMail); 
reader.showResponse(); 
for (String mail : toMail) { 
writer.println("RCPT TO:" + mail); 
reader.showResponse(); 
} 
writer.println("DATA"); 
writer.println("Content-Type:text/html"); 
if (subject != null) { 
writer.println("Subject:" + subject); 
} 
writer.println("From:" + fromMail); 
writer.print("To:"); 
for (String mail : toMail) { 
writer.print(mail + "; "); 
} 
writer.println(); 
writer.println(); 
writer.println(content); 
writer.println("."); 
reader.showResponse(); 
writer.println("QUIT"); 
reader.showResponse(); 
try { 
socket.close(); 
} catch (IOException e) { 
System.err.println("发送邮件完成，关闭 Socket 出错：" + e.getMessage()); 
} 
} 

public String getSubject() { 
return subject; 
} 

public void setSubject(String subject) { 
this.subject = subject; 
} 

public String getFromMail() { 
return fromMail; 
} 

public void setFromMail(String fromMail) { 
this.fromMail = fromMail; 
} 

public String getSmtpServer() { 
return smtpServer; 
} 

public void setSmtpServer(String smtpServer) { 
this.smtpServer = smtpServer; 
} 

public int getSmtpPort() { 
return smtpPort; 
} 

public void setSmtpPort(int smtpPort) { 
this.smtpPort = smtpPort; 
} 

public String getContent() { 
return content; 
} 

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

public List getToMail() { 
return toMail; 
} 

public void setToMail(List toMail) { 
this.toMail = toMail; 
} 

public String getUserName() { 
return userName; 
} 

public void setUserName(String userName) { 
this.userName = userName; 
} 

public String getPassword() { 
return password; 
} 

public void setPassword(String password) { 
this.password = password; 
} 

public boolean getShowLog() { 
return showLog; 
} 

public void setShowLog(boolean showLog) { 
this.showLog = showLog; 
} 

static class PrintWriterProxy extends PrintWriter { 
private boolean showRequest; 

public PrintWriterProxy(OutputStream out, boolean showRequest) { 
super(out, true); 
this.showRequest = showRequest; 
} 

@Override 
public void println() { 
if (showRequest) 
System.out.println(); 
super.println(); 
} 

public void print(String s) { 
if (showRequest) 
System.out.print(s); 
super.print(s); 
} 
} 

static class BufferedReaderProxy extends BufferedReader { 
private boolean showResponse = true; 

public BufferedReaderProxy(Reader in, boolean showResponse) { 
super(in); 
this.showResponse = showResponse; 
} 

public void showResponse() { 
try { 
String line = readLine(); 
String number = line.substring(0, 3); 
int num = -1; 
try { 
num = Integer.parseInt(number); 
} catch (Exception e) { 
} 
if (num == -1) { 
throw new RuntimeException("响应信息错误 : " + line); 
} else if (num >= 400) { 
throw new RuntimeException("发送邮件失败 : " + line); 
} 
if (showResponse) { 
System.out.println(line); 
} 
} catch (IOException e) { 
System.out.println("获取响应失败"); 
} 
} 

} 
}