Hello World

### 1、查看msyql字符集
```
show variables like 'char%';
```

### 2、sudo vim /etc/my.cnf，加上如下配置
```
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
default-character-set=utf8  # 加上这句话
default-character=utf8      # 加上这句话


[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[client]                    # 加上这句话
default-character-set=utf8  # 加上这句话
```

### 3、重启mysql
```
sudo service mysqld restart
```

### 4、创建数据库,指定utf-8 编码格式
```
CREATE DATABASE myweb default charset utf8 COLLATE utf8_general_ci;
```

### 5、创建表,指定utf-8 编码格式

```
USE myweb;
CREATE TABLE class
(
   class_id BIGINT NOT NULL COMMENT  '班级id',
   class_name VARCHAR(256) NOT NULL COMMENT '班级名称',
   class_master VARCHAR(256) NOT NULL COMMENT '班主任',
   PRIMARY KEY (class_id)
)ENGINE =InnoDB DEFAULT CHARSET=utf8 COMMENT ='班级表';
```

### 6、java-mysql连接设置成utf8
```
jdbc:mysql://master:3306/myweb?useUnicode=true&characterEncoding=utf8
```
### 7、设置html页面
```
<head>
    <title>Hello World</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>

```
### 8、设置rest方式返回的json编码
```
@RequestMapping(value = "/getStudentInfo", method = RequestMethod.GET, produces = "application/json; charset=utf-8")

```