It is best to track the breakpoint at which step the Chinese became garbled for better positioning;
If breakpoints are inconvenient, check them all:
1. Change the character set of IDE workspace to UTF-8
以Eclipse为例：window-Preferences-General-Workspace-Text file encoding
2. Add character set encoding filtering in web.xml to solve the problem of front-end Chinese garbled characters
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<async-supported>true</async-supported>
<init-param：>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
3. Add the character set when configuring the jdbc data source: (In fact, if you specify the character set when you create the database, you don't need to add this step)
jdbc:mysql://127.0.0.1:3306/logistics?useUnicode=true&characterEncoding=UTF-8
4. Database character set
登录数据库，执行如下sql:
show variables like 'character%';
结果：
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
可以看到character_set_database和character_set_server的字符集不是utf8，这个往往出现在用rpm包安装的情况下，默认就是latin1的，所以需要修改
修改方法网上教程很多，但是不同版本其实有所区别，比如很多教程里说到修改my.cnf配置，但是并不是所有的my.cnf配置文件里都有[client]和[mysql]，而是只有[mysqld]，如果是第一次修改的朋友，可能会在这里有一些困惑；
如果只有[mysqld]，只需要在[mysqld]下面添加一行character-set-server=utf8，（如果mysql是5.6以前的版本，字符集设置是 default-character-set=utf8），然后重启即可；
再去数据库里面查看如下：
mysql> show variables like '%character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
已经变为utf8了；
基本以上步骤都做了，应该不会再有中文乱码问题了。