Openfire solves the problem of Chinese garbled code after using MySQL database

Openfire It's a very good one IM The server , And it's pure Java Realization , Versions with multiple platforms , His data can be stored in a variety of databases , Such as MySQL,Oracle etc. .

In actual use, the most common thing we encounter is to use MySQL Chinese garbled code behind the database , This question is very interesting , And it can be seen from the phenomenon Openfire Some internal mechanisms .

The practical problem is ： First start Openfire The server , Then create a new account by using the client or directly logging in to the background , Specify some Chinese attributes for this account , Such as name, etc . If you don't restart The server , You will never feel anything wrong , Because all Chinese displays are normal . Next, restart it Openfire, Use the established account to log in to the client or enter the background management side to view , You will find that all Chinese has become a question mark . Log in to the database to view , It is found that all Chinese characters are also question marks , This illustrates two problems ：

1. Openfire With application layer cache
2. There is a problem with the database encoding

The solution is very simple , First make sure you are openfire The database code created is utf8 Of , Build the predicative sentence as follows ：

create database openfire default character set utf8 default collate utf8_general_ci

When you have already created the database , You can use it. ：

alter database openfire default character set utf8 default collate utf8_general_ci;

secondly , Initializing Openfire database , That is, the first configuration Openfire The server when , The character encoding format should be added to the connection string in the connection database , Must be added to the connection UTF8 Coding requirements for , The connection string settings are as follows ：

jdbc:mysql://127.0.0.1:3306/openfire?useUnicode=true&characterEncoding=utf8

If the installation is complete , This configuration can also be changed , Direct to Openfire Installation directory , find conf/openfire.xml Such a document , Open and find the following XML section , Modify the serverURL that will do

<database>

<defaultProvider>

<driver>com.mysql.jdbc.Driver</driver>

<serverURL>jdbc:mysql://127.0.0.1:3306/openfire?useUnicode=true&amp;characterEncoding=utf8</serverURL>

Be careful ： because & Has a special meaning , Therefore, the original & The symbol must be escaped as &amp;