今天晚上在学习Mybatis注解的时候，总是遇到错误Type interface com.souvi.ibatis.xxxMapper is not known to the MapperRegistry，在网上搜索相关的解决方案时，得到的答案都不怎么详细，但知道了Mybatis注解一定要注册自己写的接口类，不然就会老报开头提到的这个错误。
下面举个例子：先看看项目的简单部署吧，如图：
先看核心文件，UserTest.java
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package
com.rollen;
import
java.io.*;
import
org.apache.ibatis.io.Resources;
import
org.apache.ibatis.session.SqlSession;
import
org.apache.ibatis.session.SqlSessionFactory;
import
org.apache.ibatis.session.SqlSessionFactoryBuilder;
public
class
UserTest {
public
static
void
main(String[] args) {
String resource =
"com/rollen/configure.xml"
;
Reader reader =
null
;
try
{
reader = Resources.getResourceAsReader(resource);
}
catch
(IOException e) {
e.printStackTrace();
}
SqlSessionFactory factory =
new
SqlSessionFactoryBuilder()
.build(reader);
factory.getConfiguration().addMapper(UserInfoMapper.
class
);
SqlSession sqlSession = factory.openSession();
try
{
UserInfoMapper userInfoMapper = sqlSession
.getMapper(UserInfoMapper.
class
);
User user = userInfoMapper.getUser(
10
);
System.out.println(user);
}
finally
{
sqlSession.close();
}
}
}
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主要要注意的是比如要注册，也就是这行代码：
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factory.getConfiguration().addMapper(UserInfoMapper.
class
);
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UserInfoMapper.java代码如下：
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package
com.rollen;
import
org.apache.ibatis.annotations.Select;
public
interface
UserInfoMapper {
@Select
(
"select * from user_tb where age= #{age}"
)
public
User getUser(
int
age);
}
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user.java 代码如下：
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package
com.rollen;
public
class
User {
private
String name;
private
int
age;
/**
* @return the name
*/
public
String getName() {
return
name;
}
/**
* @param name the name to set
*/
public
void
setName(String name) {
this
.name = name;
}
/**
* @return the age
*/
public
int
getAge() {
return
age;
}
/**
* @param age the age to set
*/
public
void
setAge(
int
age) {
this
.age = age;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public
String toString() {
// TODO Auto-generated method stub
return
"name: "
+name+
"age: "
+age;
}
}
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最后的configure.xml文件代码为：
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<?xml version=
"1.0"
encoding=
"UTF-8"
?>
<!DOCTYPE configuration PUBLIC
"-//mybatis.org//DTD Config 3.0//EN"
<configuration>
<typeAliases>
<typeAlias alias=
"User"
type=
"com.rollen.User"
/>
</typeAliases>
<environments
default
=
"development"
>
<environment id=
"development"
>
<transactionManager type=
"JDBC"
/>
<dataSource type=
"POOLED"
>
<property name=
"driver"
value=
"com.mysql.jdbc.Driver"
/>
<property name=
"username"
value=
"root"
/>
<property name=
"password"
value=
"root"
/>
</dataSource>
</environment>
</environments>
</configuration>
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参考文章：http://www.laokboke.net/2012/09/25/mybatis-annotation/
