https://www.cnblogs.com/zyxs/p/9106358.html
1:在父工程中添加如mongoDB的依赖
2:在util包中引入父类mongodb的驱动类
3:导入mogodb的util包和properties文件
MongoDBUtil.java mongodb.properties
![5VASKZ6@SUZF5KJ9CA7MT8.png
4:对导入的MongoDB进行测试
Test.java
5: 额外的数据库在业务逻辑层添加,Redis可以选定类型接收,MongoDBUtil只能存放在集合中,append进去。
UserServiceImpl.java
![V7{X9X
PQLQBY}Y[Q8R5H.png](https://cdn.nlark.com/yuque/0/2021/png/22616587/1635765978079-9e4d4484-349f-43e3-bd13-95d23f00d9c7.png#clientId=ua92c89c0-2dbe-4&from=paste&height=427&id=u3103416d&margin=%5Bobject%20Object%5D&name=V%607%7BX9X%60PQLQBY%7DY%5BQ8R5H.png&originHeight=854&originWidth=1656&originalType=binary&ratio=1&size=140932&status=done&style=none&taskId=u0f985868-09fb-4465-acc2-2eb036ba9ae&width=828)
6:加入邮件跳转,在servlet层加入
UserServlet.java
![04SE}5KTT}S]@2W7_OPJDY.png