Spring boot连接3.03以上的mongodb 权限验证问题

由于3.0.3，mongodb加入了SCRAM-SHA-1校验方式，需要第三方工具配合进行验证，所有Spring boot连接MongoDB时会出现用户认证失败。

解决方法：

> use admin 
switched to db admin 
>  var schema = db.system.version.findOne({"_id" : "authSchema"}) 
> schema.currentVersion = 3 
3 
> db.system.version.save(schema) 
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) 

删除原来创建的已经使用了SCRAM-SHA-1认证方式的用户

> use admin 
switched to db admin 
> db.system.users.find() 
[...] 
{ "_id" : "userdb.myuser", "user" : "myuser", "db" : "userdb", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "XXXXXXXXXXXXXXXXXXXXXXXX", "storedKey" : "XXXXXXXXXXXXXXXXXXXXXXXXXXX", "serverKey" : "XXXXXXXXXXXXXXXXXXXXXXXXXXX" } }, "roles" : [ { "role" : "dbOwner", "db" : "userdb" } ] } 

> use userdb 
switched to db userdb 
> db.dropUser("myuser") 
true 
>db.createUser({user:'myuser',pwd:'123456',roles:[{role:'dbOwner',db:'userdb'}]}) 

然后关闭服务器，开启认证，重启服务器！！