JAVA高级面试进阶训练营视频教程

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-- private JavaMailSender sender; 可能会出现注入错误，请注意yam配置文件中格式是否一致；否则会找不到注入的bean

一 发送邮件

在Springboot中发送邮件非常简单。

pom.xml引入maven依赖

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
		</dependency>

在application.yml里设置发信人的账号、密码

spring:
  mail:
    host: smtp.qq.com
    username: 27255XXXX@qq.com
    password: njcvcbdkrofgbhie
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
            required: true

这个username就是未来发信时的邮箱地址，password是授权码。

这里以普通qq邮箱为例，注意password不是qq密码，而是授权码。

在qq邮箱-设置-账户，找到图片中的地方，开启IMAP/SMTP服务，开启后才能在别的客户端使用该qq邮箱发邮件，然后生成授权码，填写到application.yml的password位置。

然后就可以使用该邮箱作为发件人了。

看一下发邮件的具体代码，参考http://blog.csdn.net/clementad/article/details/51833416

package com.zhx.commonservice.common.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

/**
 * @Author: SimonHu
 * @Date: 2019/5/23 9:04
 * @Description:
 */
@Service
public class MailService {
    
    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Autowired
    private JavaMailSender sender;
    
    @Value("${spring.mail.username}")
    private String from;
    
    /**
     * 发送纯文本的简单邮件
     * @param to
     * @param subject
     * @param content
     */
    public void sendSimpleMail(String to, String subject, String content){
        SimpleMailMessage message = new SimpleMailMessage();
        String[] toRecive = to.split(",");
        message.setFrom(from);
        message.setTo(toRecive);
        message.setSubject(subject);
        message.setText(content);
        
        try {
            sender.send(message);
            logger.info("简单邮件已经发送。");
        } catch (Exception e) {
            logger.error("发送简单邮件时发生异常！", e);
        }
    }
    
    /**
     * 发送html格式的邮件
     * @param to
     * @param subject
     * @param content
     */
    public void sendHtmlMail(String to, String subject, String content){
        MimeMessage message = sender.createMimeMessage();
        
        try {
            String[] toRecive = to.split(",");
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(toRecive);
            helper.setSubject(subject);
            helper.setText(content, true);
            
            sender.send(message);
            logger.info("html邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送html邮件时发生异常！", e);
        }
    }
    
    /**
     * 发送带附件的邮件
     * @param to
     * @param subject
     * @param content
     * @param filePath
     */
    public void sendAttachmentsMail(String to, String subject, String content, String filePath){
        MimeMessage message = sender.createMimeMessage();
        
        try {
            String[] toRecive = to.split(",");
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(toRecive);
            helper.setSubject(subject);
            helper.setText(content, true);
            
            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
            helper.addAttachment(fileName, file);
            
            sender.send(message);
            logger.info("带附件的邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送带附件的邮件时发生异常！", e);
        }
    }
    
    /**
     * 发送嵌入静态资源（一般是图片）的邮件
     * @param to
     * @param subject
     * @param content 邮件内容，需要包括一个静态资源的id，比如：<img src=\"cid:rscId01\" >
     * @param rscPath 静态资源路径和文件名
     * @param rscId 静态资源id
     */
    public void sendInlineResourceMail(String to, String subject, String content, String rscPath, String rscId){
        MimeMessage message = sender.createMimeMessage();
        
        try {
            String[] toRecive = to.split(",");
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(toRecive);
            helper.setSubject(subject);
            helper.setText(content, true);
            
            FileSystemResource res = new FileSystemResource(new File(rscPath));
            helper.addInline(rscId, res);
            
            sender.send(message);
            logger.info("嵌入静态资源的邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送嵌入静态资源的邮件时发生异常！", e);
        }
    }
}

然后就可以使用里面的方法发邮件了。
可以先写个简单的测试类，调用

mailService.sendSimpleMail("wuweifeng@XXX.com", "主题：简单邮件", "测试邮件内容");

填写个收信人的地址就OK了。然后就能收到邮件了。收信人可以有多个，通过SimpleMailMessage可以看到。

二 拦截全局异常并发邮件
定义一个全局拦截类
 

package com.tianyalei.testmail.global;
 
import com.tianyalei.testmail.service.MailService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
 
import javax.servlet.http.HttpServletRequest;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Enumeration;
 
import static org.springframework.http.HttpStatus.NOT_EXTENDED;
 
/**
 * Created by wuwf on 17/3/31.
 * 全局异常处理
 */
@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
    private Logger logger = LoggerFactory.getLogger(getClass().getName());
    @Autowired
    private MailService mailService;
 
    /**
     * 在controller里面内容执行之前，校验一些参数不匹配啊，Get post方法不对啊之类的
     */
    @Override
    protected ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
        System.out.println("错误");
        return new ResponseEntity<>("出错了", NOT_EXTENDED);
    }
 
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public String jsonHandler(HttpServletRequest request, Exception e) throws Exception {
        log(e, request);
 
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        e.printStackTrace(pw);
        //发送邮件
        mailService.sendSimpleMail("wuweifeng@XXXX.com", "异常", sw.toString());
 
        return "发生异常";
    }
 
    private void log(Exception ex, HttpServletRequest request) {
        logger.error("************************异常开始*******************************");
        logger.error("请求地址：" + request.getRequestURL());
        Enumeration enumeration = request.getParameterNames();
        logger.error("请求参数");
        while (enumeration.hasMoreElements()) {
            String name = enumeration.nextElement().toString();
            logger.error(name + "---" + request.getParameter(name));
        }
 
        StackTraceElement[] error = ex.getStackTrace();
        for (StackTraceElement stackTraceElement : error) {
            logger.error(stackTraceElement.toString());
        }
        logger.error("************************异常结束*******************************");
    }
}