Mybatis使用接口实现添加一直加不进去

[曾几何时锐不可当]

这是单元测试的部分：
public SqlSessionFactory getSqlSessionFactory() throws IOException {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
return new SqlSessionFactoryBuilder().build(inputStream);
}
public void test03() throws IOException{
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
SqlSession openSession = sqlSessionFactory.openSession();
try{
EmployeeMapperAnnotation mapper = openSession.getMapper(EmployeeMapperAnnotation.class);
Employee employee=new Employee(null, "leihong", "159159");

//System.out.println(employee);

mapper.insertuser(employee);
openSession.commit();
System.out.println("成功");
}finally{
openSession.close();

}
}
这是接口的内容：

package com.atguigu.mybatis.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;

import com.atguigu.mybatis.bean.Employee;

public interface EmployeeMapperAnnotation {

@Select("select * from user where id=#{id}")
@Insert("insert into user(username,password) values(#{username},#{password})")
public Employee getEmpById(Integer id);
public Employee insertuser(Employee employee);
}

这是sql映射xml文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.atguigu.mybatis.dao.EmployeeMapperAnnotation">

<select id="getEmpById" resultType="com.atguigu.mybatis.bean.Employee">
select * from user where id = #{id}
</select>
<insert id="insertuser">
insert into user(username,password) values(#{username},#{password})
</insert>
</mapper>

[b]这是封装的类：[/b]

package com.atguigu.mybatis.bean;

import org.apache.ibatis.type.Alias;

@Alias("emp")
public class Employee {

private Integer id;
private String username;
private String password;


public Employee() {
super();
// TODO Auto-generated constructor stub
}


public Employee(Integer id, String username, String password) {
super();
this.id = id;
this.username = username;
this.password = password;
}


public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "Employee [id=" + id + ", username=" + username + ", password=" + password + "]";
}

这是全局配置文件：
<mappers>

<package name="com.atguigu.mybatis.dao"/>
</mappers>