关于最近很火的给对象的公众号之java spring boot 定时发送邮件教学

最近给女朋友的接口测试号很流行，但是需要商家或者企业资质，但是我们可以通过邮箱实现相同的功能。大致效果如下（源代码底部）：

话不多说，直接上教程，首先新建spring boot项目，这个过程不复杂我就不过多阐述了，直接上页面图，画框部分是我们需要关注的代码片段，其他的属于无关代码。如果自己重新创建项目可以只创建这几个类。

新建两个实体类，其中一些注解不用管，原本是想从数据库中拿但只是教学就没必要了。

天气查询的方法，这里使用的是第三方接口，聚合数据，进入官网搜索天气预报api，找到就行了。点击申请是免费的，一天拥有30次权限，申请过后在个人中心里面找到天气预报api，然后有一串key，自己更换下就好。

package com.example.sendemail.util;import com.example.sendemail.entity.weatherEntity;
import net.sf.json.JSONObject;
import org.springframework.stereotype.Component;import javax.annotation.Resource;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;@Component
public class SimpleWeather {// 天气情况查询接口地址public static String API_URL = "http://apis.juhe.cn/simpleWeather/query";// 接口请求Keypublic static String API_KEY = "你自己的key";public static weatherEntity weather =new weatherEntity();/*** 根据城市名查询天气情况** @param cityName*/public  weatherEntity queryWeather(String cityName) {Map<String, Object> params = new HashMap<>();//组合参数params.put("city", cityName);params.put("key", API_KEY);String queryParams = urlencode(params);String response = doGet(API_URL, queryParams);try {JSONObject jsonObject = JSONObject.fromObject(response);int error_code = jsonObject.getInt("error_code");if (error_code == 0) {JSONObject result = jsonObject.getJSONObject("result");JSONObject realtime = result.getJSONObject("realtime");System.out.printf("城市：%s%n", result.getString("city"));System.out.printf("天气：%s%n", realtime.getString("info"));System.out.printf("温度：%s%n", realtime.getString("temperature"));System.out.printf("湿度：%s%n", realtime.getString("humidity"));System.out.printf("风向：%s%n", realtime.getString("direct"));System.out.printf("风力：%s%n", realtime.getString("power"));System.out.printf("空气质量：%s%n", realtime.getString("aqi"));weather.setCity(result.getString("city"));weather.setInfo(realtime.getString("info"));weather.setTemperature(realtime.getString("temperature"));weather.setHumidity(realtime.getString("humidity"));weather.setDirect(realtime.getString("direct")+realtime.getString("power"));weather.setAqi(realtime.getString("aqi"));weather.setPower(realtime.getString("power"));return weather;} else {weather.setCity("重庆");weather.setInfo("查询失败");weather.setTemperature("查询失败");weather.setHumidity("查询失败");weather.setDirect("查询失败");weather.setAqi("查询失败");weather.setPower("查询失败");System.out.println("调用接口失败：" + jsonObject.getString("reason"));return weather;}} catch (Exception e) {e.printStackTrace();}return null;}/*** get方式的http请求** @param httpUrl 请求地址* @return 返回结果*/public static String doGet(String httpUrl, String queryParams) {HttpURLConnection connection = null;InputStream inputStream = null;BufferedReader bufferedReader = null;String result = null;// 返回结果字符串try {// 创建远程url连接对象URL url = new URL(new StringBuffer(httpUrl).append("?").append(queryParams).toString());// 通过远程url连接对象打开一个连接，强转成httpURLConnection类connection = (HttpURLConnection) url.openConnection();// 设置连接方式：getconnection.setRequestMethod("GET");// 设置连接主机服务器的超时时间：15000毫秒connection.setConnectTimeout(5000);// 设置读取远程返回的数据时间：60000毫秒connection.setReadTimeout(6000);// 发送请求connection.connect();// 通过connection连接，获取输入流if (connection.getResponseCode() == 200) {inputStream = connection.getInputStream();// 封装输入流，并指定字符集bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));// 存放数据StringBuilder sbf = new StringBuilder();String temp;while ((temp = bufferedReader.readLine()) != null) {sbf.append(temp);sbf.append(System.getProperty("line.separator"));}result = sbf.toString();}} catch (IOException e) {e.printStackTrace();} finally {// 关闭资源if (null != bufferedReader) {try {bufferedReader.close();} catch (IOException e) {e.printStackTrace();}}if (null != inputStream) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}if (connection != null) {connection.disconnect();// 关闭远程连接}}return result;}/*** 将map型转为请求参数型** @param data* @return*/public static String urlencode(Map<String, ?> data) {StringBuilder sb = new StringBuilder();for (Map.Entry<String, ?> i : data.entrySet()) {try {sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue() + "", "UTF-8")).append("&");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}String result = sb.toString();result = result.substring(0, result.lastIndexOf("&"));return result;}
}

发送邮件使用的是spring boot已经封装好的工具‘

package com.example.sendemail.util;import com.example.sendemail.entity.EmailEntity;
import org.junit.jupiter.api.Test;
import org.springframework.boot.autoconfigure.mail.MailProperties;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Component;import javax.annotation.Resource;@Component
public class MailUtil {@Resourceprivate JavaMailSender javaMailSender;@Resourceprivate MailProperties mailProperties;public void sendMail(EmailEntity email){SimpleMailMessage message = new SimpleMailMessage();message.setTo(email.getEmailAddress());message.setFrom(mailProperties.getUsername());message.setSubject(email.getSubject());message.setText(email.getWeather().toString()+email.getText());javaMailSender.send(message);}
}

然后就是发送邮件的类，这里我写了两个，一个是调用接口区发送，也就是地址栏输入地址，还有个是定时任务，可根据自己的需求，定时发送，这里天气是实时获取的。

package com.example.sendemail.scheduled;import com.example.sendemail.entity.EmailEntity;
import com.example.sendemail.entity.weatherEntity;
import com.example.sendemail.service.EmailService;
import com.example.sendemail.util.MailUtil;
import com.example.sendemail.util.SimpleWeather;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import javax.annotation.Resource;
import javax.mail.MessagingException;
import java.text.SimpleDateFormat;
import java.util.Date;@Configuration
@EnableScheduling
@RequestMapping("/test")
public class scheduledController {@Resourceprivate MailUtil mailUtil;@Resourceprivate SimpleWeather simpleWeather;@Autowiredprivate EmailService service;@RequestMapping("/test")@ResponseBodypublic String start() throws MessagingException {//地址城市String city = "重庆";weatherEntity weather = simpleWeather.queryWeather(city);EmailEntity email = new EmailEntity();//收件人email.setEmailAddress("xxxxx@qq.com");//标题email.setSubject("dear");//正文email.setText("\n元气满满");email.setWeather(weather);mailUtil.sendMail(email);return "发送成功";}//定时任务(周一至周五)  秒 分 时  日    月   星期@Scheduled ( cron = "0 21 14 1-31 1-12 1-5 ")public void start2() throws MessagingException {//地址城市String city = "重庆";weatherEntity weather = simpleWeather.queryWeather(city);EmailEntity email = new EmailEntity();//收件人email.setEmailAddress("xxxxxx@qq.com");//标题email.setSubject("dear");//设置天气email.setWeather(weather);//正文（天气后的内容）email.setText("\n元气满满");mailUtil.sendMail(email);}}

然后是配置文件yml

server:port: 8080
spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/email?useUnicode=true&characterEncoding=utf-8username: rootpassword: 123456
# 邮箱配置mail:host: smtp.163.comusername: yaojiayi0720@163.compassword: ACUIDKYDKXEXIAJJ

最后是依赖，pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.3</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>SendEmail</artifactId><version>0.0.1-SNAPSHOT</version><name>SendEmail</name><description>SendEmail</description><properties><java.version>18</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
<!--        邮箱依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-mail</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.6</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.3.2</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.8.0</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.8.0</version></dependency><dependency><groupId>com.github.xiaoymin</groupId><artifactId>swagger-bootstrap-ui</artifactId><version>1.8.5</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.2.0</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.75</version></dependency><dependency><groupId>net.oschina.zcx7878</groupId><artifactId>fastdfs-client-java</artifactId><version>1.27.0.0</version></dependency><dependency><groupId>com.github.tobato</groupId><artifactId>fastdfs-client</artifactId><version>1.26.4</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.5</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

代码链接：https://gitee.com/yao-jiayi/SendEmail.git

下载这个就行，直接上传的rar包

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