java部署ubuntu后中文显示问号问题

1、首先先回忆自身项目的编码格式，即在本地进行编码时使用的编码格式。UTF-8
2、检测tomcat的设置问题，在web.xml和server中的设置：
server.xml中：

<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000"　redirectPort="8443" 
URIEncoding="UTF-8" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"  URIEncoding="UTF-8"/>

web.xml中以下内容去掉注释：

<filter>
        <filter-name>setCharacterEncodingFilter</filter-name>
        <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <async-supported>true</async-supported>
    </filter>

3、检测ubuntu服务器中的编码格式

//检测本地语言环境：
locale
//进行配置的修改
vi /etc/profile
//添加下列行(LC_ALL表示全部设置，但不影响LANG)：
export LANG="en_US.UTF-8"
export LC_ALL="zh_CN.UTF-8"
//设置后使其起效
source /etc/profile
//当出现 cannot 错误时 ,使用以下命令进行安装相应语言包
sudo locale-gen zn_CN.UTF-8
//当起效后，要再次进入配置中修改，将刚添加的两行删除，不然会影响jdk环境

4、mysql的配置
1.修改mysql默认配置：
默认的mysql配置：server、client都是latin1,对中文是不支持的，这里改为utf8
方法：
修改配置文件：

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci

重启mysql

/etc/init.d/mysql restart

检查编码方式：

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
2.修改项目使用的数据库的配置
修改此数据库的编码方式为utf8(默认是latin1)
mysql> alter database 数据库名 character set utf8;

查看此数据库的编码：
mysql> status

Connection id: 41
Current database: tslcrms
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.38-0ubuntu0.14.04.1 (Ubuntu)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /var/run/mysqld/mysqld.sock
Uptime: 53 min 14 sec

mysql> show create database tslcrms;
+----------+------------------------------------------------------------------+
| Database | Create Database |
+----------+------------------------------------------------------------------+
| tslcrms | CREATE DATABASE数据库名/*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+------------------------------------------------------------------+

3.导入数据库文件中的表、字段的编码方式都修改成utf8
可以直接改.sql文件，改完导入。
也可以先导入，再用命令查看和更改。

附：在mysql中使用命令修改字符集：
mysql> SET character_set_client = utf8 ;

 mysql> SET character_set_connection = utf8 ;
 mysql> SET character_set_database = utf8 ;
 mysql> SET character_set_results = utf8 ;
 mysql> SET character_set_server = utf8 ;
 mysql> SET collation_connection = utf8 ;
 mysql> SET collation_database = utf8 ;
 mysql> SET collation_server = utf8 ;

SET NAMES 'utf8';
相当于下面的三句指令：
SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;

5、另外
mysql默认的字符集为latin1的，所以要改为utf8的。很多网上的文章执行“sudo vi /etc/mysql/my.cnf”，可是打开一看，里面就两行话：

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

想来mysql的配置文件应该是在那两个文件夹下面，于是尝试之下打开了/etc/mysql/mysql.conf.d/ 下的mysqld.cnf文件，执行下面的命令：

~$ sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

[client]
default-character-set=utf8

[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci

后重启Mysql服务器
~$ sudo /etc/init.d/mysql restart
~$ mysql -u root -p
mysql> show variables like "%char%"
+--------------------------+----------------------------+
| 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/ |
+--------------------------+----------------------------+