使用javax.mail发送邮件报错

[qq_31774283]

错误信息：
javax.mail.NoSuchProviderException: Invalid protocol: null
at javax.mail.Session.getProvider(Session.java:431)
at javax.mail.Session.getTransport(Session.java:650)
at javax.mail.Session.getTransport(Session.java:631)
at javax.mail.Session.getTransport(Session.java:617)
at com.wensheng.pia5.biz.MailSenderBiz.sendHtmlMail(MailSenderBiz.java:113)
at com.wensheng.pia5.biz.MailSenderBiz.sendEmail(MailSenderBiz.java:147)
at com.wensheng.pia5.biz.MailSenderBiz.main(MailSenderBiz.java:161)
代码信息：
package com.wensheng.pia5.bean;

import java.util.Properties;

public class MailSenderDtoBean {

//发送邮件的服务器IP和端口
private String mainServerHost="smtp.qq.com";
private String mainServerPort; //端口

//邮件发送者的地址
private String formAddress;
//邮件接收者的地址
private String toAddress;
//登陆邮件发送服务器的用户名和密码
private String username;
private String password;
//是否需要身份认证
private boolean validate = false;

//邮件主题
private String subject;
//邮件的文本内容
private String content;

/**
* 获得邮件的会话
* */
public Properties getProperties(){
Properties p = new Properties();
p.put("mail.smtp.host", mainServerHost);
/*p.put("mail.smtp.port", this.mainServerPort);*/
p.put("mail.smtp.auth", validate?"true":"false");
return p;
}

public String getMainServerHost() {
return mainServerHost;
}

public void setMainServerHost(String mainServerHost) {
this.mainServerHost = mainServerHost;
}

public String getMainServerPort() {
return mainServerPort;
}

public void setMainServerPort(String mainServerPort) {
this.mainServerPort = mainServerPort;
}

public String getFormAddress() {
return formAddress;
}

public void setFormAddress(String formAddress) {
this.formAddress = formAddress;
}

public String getToAddress() {
return toAddress;
}

public void setToAddress(String toAddress) {
this.toAddress = toAddress;
}

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 isValidate() {
return validate;
}

public void setValidate(boolean validate) {
this.validate = validate;
}

public String getSubject() {
return subject;
}

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

public String getContent() {
return content;
}

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


}

package com.wensheng.pia5.bean;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

public class MyAuthenticatorBean extends Authenticator {

String username = null;
String password = null;


public MyAuthenticatorBean(){

}

public MyAuthenticatorBean(String username,String password){
this.username = username;

this.password = password;
}

public PasswordAuthentication getPasswordAuthentication(){
return new PasswordAuthentication(username, password);
}

}


package com.wensheng.pia5.biz;

import java.util.Date;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
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;


import com.wensheng.pia5.bean.MailSenderDtoBean;
import com.wensheng.pia5.bean.MyAuthenticatorBean;


/**
* 主要发送邮箱,简单邮件(不带附件的邮件)发送器
* */
public class MailSenderBiz{

public boolean sendTextMail(MailSenderDtoBean mail){

//判断是否需要身份验证
MyAuthenticatorBean myAuthenticatorBean = null;
Properties p = new Properties();

if(mail.isValidate()){
//如果需要身份验证，则创建一个密码验证器
myAuthenticatorBean = new MyAuthenticatorBean(mail.getUsername(),mail.getPassword());
}

//根据邮件会话属性和密码验证器构造一个发送邮件的session
Session sendMailSession = Session.getDefaultInstance(p,myAuthenticatorBean);

try{
//根据session 创建一个邮件消息
Message mailMessage = new MimeMessage(sendMailSession);
//创建邮件发送者地址
Address from = new InternetAddress(mail.getFormAddress());
//设置邮件消息的发送者
mailMessage.setFrom(from);
//创建邮件的接收者地址,并设置到邮件消息中
Address to = new InternetAddress(mail.getToAddress());
mailMessage.setRecipient(Message.RecipientType.TO, to);
//设置邮件消息的主题
mailMessage.setSubject(mail.getSubject());
//设置邮件消息发送的时间
mailMessage.setSentDate(new Date());
//设置邮件消息的主要内容
String mailContent = mail.getContent();
mailMessage.setText(mailContent);
Transport.send(mailMessage);
return true;
}catch(MessagingException ex){
ex.printStackTrace();
}
return false;
}



/**
* 以HTML格式发送邮件
*
* */

public boolean sendHtmlMail(MailSenderDtoBean mail){
//判断是否需要身份验证
MyAuthenticatorBean myAuthenticatorBean = null;
Properties pro = mail.getProperties();
//如果需要身份验证
if(mail.isValidate()){
myAuthenticatorBean = new MyAuthenticatorBean(mail.getUsername(),mail.getPassword());

}
//根据邮件会话属性和密码验证器构造一个发送邮件的session
Session sendMailSession = Session.getDefaultInstance(pro,myAuthenticatorBean);


try {
//根据session创建一个邮件消息
Message mailMessage = new MimeMessage(sendMailSession);
//创建邮件发送者地址
Address from = new InternetAddress(mail.getFormAddress());
//设置邮件消息的发送者
mailMessage.setFrom(from);
//创建邮件的接收者地址，并设置到邮件消息中
Address to = new InternetAddress(mail.getToAddress());
//Message.RecipientType.To属性表示接收者的类型为TO
mailMessage.setRecipient(Message.RecipientType.TO, to);
//设置邮件消息的主题
mailMessage.setSubject(mail.getSubject());
//设置邮件消息发送的时间
mailMessage.setSentDate(new Date());
//MiniMultpart类是一个容器类,包含MimeBodyPart类型的对象
Multipart mainPart = new MimeMultipart();
//创建一个包含HTML
BodyPart html = new MimeBodyPart();
//设置html内容
html.setContent(mail.getContent(),"text/html;charset=utf-8");
mainPart.addBodyPart(html);
//将MiniMultipart对象设置为邮件内容
mailMessage.setContent(mainPart);
//发送邮件
Transport.send(mailMessage);
return true;
} catch (MessagingException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
}

return false;
}


/**
* 发送邮件
* */

public void sendEmail(String email){

try{
String mailTitle="测试";
String mailContent = "<br/><br/>亲爱的用户<br/><br/>"+
"验证码："+email;
MailSenderDtoBean mail = new MailSenderDtoBean();
/*mail.setMainServerHost("218.244.129.224");//服务器ip
*/ /*mail.setMainServerPort("5005");//服务器端口
*/ mail.setValidate(true);
mail.setUsername("[e-mail]");
mail.setPassword("***********");
mail.setFormAddress("[e-mail]");
mail.setToAddress("[e-mail]");//接收人的邮箱
mail.setSubject(mailTitle);
mail.setContent(mailContent);
//这个类主要来发送邮件
MailSenderBiz mailSenderBiz = new MailSenderBiz();
boolean flag = mailSenderBiz.sendHtmlMail(mail);
if(flag){
System.out.println("success");
}else{
System.out.println("fail");
}
}catch(Exception e){
System.err.println("失败了");
}
}


public static void main(String[] args) {
MailSenderBiz ma = new MailSenderBiz();
ma.sendEmail("a");
}
}


求高手帮忙看看到底是什么问题，输入的邮箱和密码都是正确的 也开通了smtp服务，可是仍然无法实现

[HD_XB]

/*p.put("mail.smtp.port", this.mainServerPort);*/ /*mail.setMainServerHost("218.244.129.224");//服务器ip */ /*mail.setMainServerPort("5005");//服务器端口 */ 这几句都被你注释了 然后 mainServerHost="smtp.qq.com"; 指定了

[家里敷泥呀]

报的什么错？

[qq_31774283]

引用 1 楼 Q80470101 的回复:

报的什么错？

javax.mail.AuthenticationFailedException

[家里敷泥呀]

javax.mail.NoSuchProviderException: Invalid protocol: null 他说的你protocol是null，所以报错。 我刚才翻了一遍源码 at javax.mail.Session.getProvider(Session.java:431) at javax.mail.Session.getTransport(Session.java:650) at javax.mail.Session.getTransport(Session.java:631) at javax.mail.Session.getTransport(Session.java:617) 逆推到Session.java:617时，发现，他是从Properties中取了mail.transport.protocol的值。 你把它设置上即可： p.setProperty("mail.transport.protocol", "smtp"); Session.java:617： public Transport getTransport() throws NoSuchProviderException { return getTransport(getProperty("mail.transport.protocol")); }