SpingBoot +JavaMail + FreeMarker 模板邮件发送功能

1、邮件模板数据库结构设计：

DROP TABLE IF EXISTS `email`;
CREATE TABLE `email`  (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `paramter` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `context` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of email
-- ----------------------------
INSERT INTO `email` VALUES (1, 'name,money,point', '您好${name}，晚上好！您目前余额：${money?string(r\"#.##r\")}元，积分：${point}', 'emailtemplate');

2、SpringBoot 模板封装结构图：

3、核心代码：

pom.xml 文件

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <parent>
  <groupId>com.zzg</groupId>
  <artifactId>mysql-boot</artifactId>
  <version>0.0.1-SNAPSHOT</version>
 </parent>
 <artifactId>mysql-boot-template</artifactId>
 <dependencies>
  <!--freemarker模板引擎 -->
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-freemarker</artifactId>
  </dependency>
 </dependencies>
</project>

java代码：

package com.zzg.freemarker.util;

import java.io.StringWriter;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import freemarker.cache.StringTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;

/**
 * 
 * @ClassName:  FreeMarkerUtil   
 * @Description: freemarker 工具类   
 * @author: **** -zzg
 * @date:   2019年4月10日 下午2:17:56   
 *     
 * @Copyright: 2019 www.digipower.cn 
 * 注意：本内容仅限于****开发有限公司内部使用，禁止用于其他的商业目的
 */
public class FreeMarkerUtil {
 
 // 引入日志
 private final static Logger logger = LoggerFactory.getLogger(FreeMarkerUtil.class);
 
 public static String transform(Map map, String context){
  try {
   //定义StringTemplateLoader
   StringTemplateLoader loader = new StringTemplateLoader();
   loader.putTemplate("template", context);
   
   //定义Configuration
   Configuration configuration = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
   configuration.setTemplateLoader(loader);
   
   //定义Template
   Template tpl = configuration.getTemplate("template");
   
   StringWriter writer = new StringWriter();
   tpl.process(map, writer);
   return writer.toString();
  } catch (Exception e) {
   logger.error(e.getMessage());
   return null;
  }
 }

}

4、模板邮件功能测试：

@RequestMapping(value="/sendTemplate", method=RequestMethod.GET)
 @ResponseBody
 public void sendTemplate(){
  List<Email> list = service.getEmails();
  if(list != null && list.size() > 0){
   list.stream().forEach(item ->{
    // 简单文本邮件发送
    EmailBean text = new EmailBean();
    text.setFrom("zhouzhiwengang@163.com");
    text.setTo("zhouzhigang@digipower.cn");
    text.setSubject("邮件模板发送");
    
    Map<String,Object> parameter = new HashMap<String,Object>();
    parameter.put("name", "周志刚");
    parameter.put("money", 1000089.155);
    parameter.put("point", 16568);
    
    try {
     // 声明模板和模板参数写入(核心代码)
     String context = FreeMarkerUtil.transform(parameter, item.getContext());
     if(StringUtils.isEmpty(context)){
      // 判断freemarker 模板解析是否正确解析
      logger.error("freemarker 模板解析错误");
      return;
     }
     text.setText(context);
    } catch (Exception e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    text.setType(Integer.valueOf(1));
    util.send(text);
    logger.error("HTML邮件发送成功");
   });
  }