本文实例为大家分享了java 利用Socket实现SMTP协议发送邮件的具体代码，供大家参考，具体内容如下
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package 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.List;
import org.apache.commons.codec.binary.Base64;
public class Mail {
public static void main(String[] args) throws IOException {
Mail mail = new Mail();
mail.setSmtpServer("smtp.qq.com");
mail.setFromMail("1344364****@qq.com");
mail.addToMail("105648****@qq.com");
mail.addToMail("long*****@sina.com");
mail.setUserName("134364****");
mail.setPassword("*************");
mail.setSubject("测试邮件");
mail.setContent("<h1>你好</h1><br/><img src=\"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<String> 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<String>();
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<String> getToMail() {
return toMail;
}
public void setToMail(List<String> 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");
}
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
