邮件发送
环境说明：
- 建立一个maven工程
- qq邮箱开启pop3和smtp服务
1. 获取邮箱授权码
打开qq邮箱设置按下图操作
2. 需要的依赖
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>
3. 创建一个邮件工具类
package com.gxa.yonghu.util;
import com.sun.mail.util.MailSSLSocketFactory;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
/**
* @author 枫叶
* @version 1.0
* @date 2020/12/22
*/
public class MailUtil implements Runnable {
// 发件人账号
public final static String MAIL_NAME = "发件人账户";
// 发件人授权码
public final static String MAIL_CODE = "第一步中获取的授权码";
// 登录的用户名
private String username = null;
// 收件人邮箱
private String email = null;
//邮件主题
private String motif = null;
//邮件内容
private String contentText = null;
public MailUtil(String username, String email, String motif, String content) {
this.username = username;
this.email = email;
this.motif = motif;
this.contentText = content;
}
@Override
public void run() {
// 指定发送邮件的主机smtp.qq.com(QQ)|smtp.163.com(网易) 这里需要继续扩展做判断分支处理
String host = "smtp.qq.com";
// 获取系统属性
Properties properties = System.getProperties();
// 设置邮件服务器
properties.setProperty("mail.smtp.host", host);
// 打开认证
properties.setProperty("mail.smtp.auth", "true");
try {
//QQ邮箱需要下面这段代码，163邮箱不需要
MailSSLSocketFactory sf = new MailSSLSocketFactory();
sf.setTrustAllHosts(true);
properties.put("mail.smtp.ssl.enable", "true");
properties.put("mail.smtp.ssl.socketFactory", sf);
// 1.获取默认session对象
Session session = Session.getDefaultInstance(properties, new Authenticator() {
@Override
public PasswordAuthentication getPasswordAuthentication() {
// 发件人邮箱账号、授权码
return new PasswordAuthentication(MailUtil.MAIL_NAME, MailUtil.MAIL_CODE);
}
});
// 2.创建邮件对象
Message message = new MimeMessage(session);
// 3.设置发件人
message.setFrom(new InternetAddress(MailUtil.MAIL_NAME));
// 4.设置收件人
message.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
// 5.设置邮件主题
message.setSubject(motif);
// 6.设置邮件内容
String content = "<html><head></head><body>" + contentText + "</body></html>";
message.setContent(content, "text/html;charset=UTF-8");
// 7.发送邮件
// 阻塞方法
Transport.send(message);
System.out.println("邮件成功发送!");
} catch (Exception e) {
e.printStackTrace();
}
}
}
4. 发送邮件
这里用servlet做演示，接收一个包含邮箱信息的json
/**
* @author 枫叶
* @version 1.0
* @date 2020/12/22
*/
@WebServlet(value = "/mail/send",name = "mail")
public class MailServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//这里使用了fastJson解析，若不想使用fastJSON可以自己使用自己喜欢的解析方式，fastJSON依赖如下
/**
* <dependency>
* <groupId>com.alibaba</groupId>
* <artifactId>fastjson</artifactId>
* <version>1.2.72</version>
* </dependency>
*/
JSONObject json = JSONObject.parseObject(req.getReader().readLine());
//获取参数
String email = json.getString("email");
System.out.println(json);
//参数验证
if (email==null||"".equals(email)){
resp.getWriter().println(DataResponse.error(400,"参数不足"));
return;
}
//其它业务
//创建html邮件内容，只需输入body中的代码
String content = "<h1>邮件标题</h1>"
+"邮件内容";
MailUtil mail = new MailUtil("发件人", email,"邮件主题",content);
//发送邮件
new Thread(mail).start();
resp.getWriter().println(DataResponse.ok());
}
}
5. 上面用到的返回封装类DataResponse如下
public class DataResponse{
private final Map<String,Object> result;
@Override
public String toString() {
//这里也用到了fastJSON并且设置了日期的格式化格式
JSON.DEFFAULT_DATE_FORMAT = "yyyy-MM-dd hh:mm:ss";
return JSON.toJSONString(result,SerializerFeature.WriteDateUseDateFormat);
}
public DataResponse(Integer code,String msg,Object data){
result = new HashMap<>();
result.put("code",code);
result.put("msg",msg);
result.put("data",data);
}
public DataResponse(Integer code,String msg){
this(code,msg,null);
}
public DataResponse() {
result=new HashMap<>();
}
public DataResponse put(String key,Object value){
result.put(key,value);
return this;
}
public static DataResponse ok(){
return new DataResponse(200,"成功!");
}
public static DataResponse ok(String msg){
return new DataResponse(200,msg);
}
public static DataResponse ok(int code,String msg){
return new DataResponse(code,msg);
}
public static DataResponse ok(String msg,Object data){
return new DataResponse(200,msg,data);
}
public static DataResponse ok(int code,String msg,Object data){
return new DataResponse(200,msg,data);
}
public static DataResponse error(){
return new DataResponse(500,"服务器错误，操作失败!");
}
public static DataResponse error(String msg){
return new DataResponse(500,msg);
}
public static DataResponse error(int code,String msg){
return new DataResponse(code,msg);
}
public Object get(String key){
return result.get(key);
}
public Object getData(){
return result.get("data");
}
public void setCode(int code) {
result.put("code",code);
}
public void setMsg(String msg) {
result.put("msg",msg);
}
public void setData(Object data) {
result.put("data",data);
}
}
6. 启动服务发送邮件
略