MyBatis的彈簧3不工作

Question

我想配置與彈簧3的MyBatis我下面的文章在

http://www.raistudies.com/spring/integrating-mybatis-3-and-spring-frameworks-part-2/

我使用的MyBatis生成器生成所有的映射器和模型calsses。使用mybatis發電機後，我有以下課程。

import java.util.Date; 

public class User extends BaseModel { 

/** 
* This field was generated by MyBatis Generator. This field corresponds to the database column users.id 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
private Integer id; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database column users.username 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
private String username; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database column users.email 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
private String email; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database column users.crypted_password 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
to the database column users.first_name 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
private String firstName; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database column users.last_name 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
private String lastName; 
// I renoved the getter setter to save space. 
} 

它還創建一個UserExample.java。我不明白爲什麼這個文件已經創建。我只是應付這個班的一部分。

import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 

    public class UserExample { 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
protected String orderByClause; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
protected boolean distinct; 
/** 
* This field was generated by MyBatis Generator. This field corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
protected List<Criteria> oredCriteria; 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
public UserExample() { 
    oredCriteria = new ArrayList<Criteria>(); 
} 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
public void setOrderByClause(String orderByClause) { 
    this.orderByClause = orderByClause; 
} 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
public String getOrderByClause() { 
    return orderByClause; 
} 

然後它創建userMapper.xml文件。我也沒有應付整個文件來節省空間。

<?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.mycom.myproject.db.mybatis.dao.UserMapper"> 
<resultMap id="BaseResultMap" type="com.mycom.myproject.db.mybatis.model.User"> 
<!-- 
    WARNING - @mbggenerated 
    This element is automatically generated by MyBatis Generator, do not modify. 
    This element was generated on Fri Aug 03 09:28:44 BST 2012. 
--> 
<result column="id" jdbcType="INTEGER" property="id" /> 
<result column="username" jdbcType="VARCHAR" property="username" /> 
<result column="email" jdbcType="VARCHAR" property="email" />  
<result column="first_name" jdbcType="VARCHAR" property="firstName" /> 
<result column="last_name" jdbcType="VARCHAR" property="lastName" /> 
</resultMap> 
<sql id="Example_Where_Clause"> 
    <!-- 
    WARNING - @mbggenerated 
    This element is automatically generated by MyBatis Generator, do not modify. 
    This element was generated on Fri Aug 03 09:28:44 BST 2012. 
--> 
    <where> 
    <foreach collection="oredCriteria" item="criteria" separator="or"> 
    <if test="criteria.valid"> 
     <trim prefix="(" prefixOverrides="and" suffix=")"> 
     <foreach collection="criteria.criteria" item="criterion"> 
      <choose> 
      <when test="criterion.noValue"> 
       and ${criterion.condition} 
      </when> 
      <when test="criterion.singleValue"> 
       and ${criterion.condition} #{criterion.value} 
      </when> 
      <when test="criterion.betweenValue"> 
       and ${criterion.condition} #{criterion.value} and #{criterion.secondValue} 
      </when> 
      <when test="criterion.listValue"> 
       and ${criterion.condition} 
       <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=","> 
       #{listItem} 
       </foreach> 
      </when> 
      </choose> 
     </foreach> 
     </trim> 
    </if> 
    </foreach> 
</where> 
    </sql> 
    <sql id="Update_By_Example_Where_Clause"> 
    <!-- 
    WARNING - @mbggenerated 
    This element is automatically generated by MyBatis Generator, do not modify. 
    This element was generated on Fri Aug 03 09:28:44 BST 2012. 
--> 
<where> 
    <foreach collection="example.oredCriteria" item="criteria" separator="or"> 
    <if test="criteria.valid"> 
     <trim prefix="(" prefixOverrides="and" suffix=")"> 
     <foreach collection="criteria.criteria" item="criterion"> 
      <choose> 
      <when test="criterion.noValue"> 
       and ${criterion.condition} 
      </when> 
      <when test="criterion.singleValue"> 
       and ${criterion.condition} #{criterion.value} 
      </when> 
      <when test="criterion.betweenValue"> 
       and ${criterion.condition} #{criterion.value} and #{criterion.secondValue} 
      </when> 
      <when test="criterion.listValue"> 
       and ${criterion.condition} 
       <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=","> 
       #{listItem} 
       </foreach> 
      </when> 
      </choose> 
     </foreach> 
     </trim> 
    </if> 
    </foreach> 
</where> 
    </sql> 
    <sql id="Base_Column_List"> 
    <!-- 
    WARNING - @mbggenerated 
    This element is automatically generated by MyBatis Generator, do not modify. 
    This element was generated on Fri Aug 03 09:28:44 BST 2012. 
    --> 
    id, username, email, crypted_password, password_salt, persistence_token, login_count, 
    failed_login_count, last_request_at, current_login_at, last_login_at, current_login_ip, 
    last_login_ip, created_at, updated_at, creator_id, updater_id, first_name, last_name 
</sql> 
    <select id="selectByExample" parameterType="com.mycom.myproject.db.mybatis.model.UserExample" resultMap="BaseResultMap"> 
<!-- 
    WARNING - @mbggenerated 
    This element is automatically generated by MyBatis Generator, do not modify. 
    This element was generated on Fri Aug 03 09:28:44 BST 2012. 
--> 
    select 
    <if test="distinct"> 
    distinct 
    </if> 
    <include refid="Base_Column_List" /> 
    from users 
    <if test="_parameter != null"> 
    <include refid="Example_Where_Clause" /> 
    </if> 
    <if test="orderByClause != null"> 
    order by ${orderByClause} 
</if> 

它還創建UserMapper界面，我認爲可以用注射

import com.mycom.myproject.db.mybatis.model.User; 
import com.mycom.myproject.db.mybatis.model.UserExample; 
import java.util.List; 
import org.apache.ibatis.annotations.Param; 

public interface UserMapper { 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int countByExample(UserExample example); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int deleteByExample(UserExample example); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int insert(User record); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int insertSelective(User record); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
List<User> selectByExample(UserExample example); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int updateByExampleSelective(@Param("record") User record, 
     @Param("example") UserExample example); 

/** 
* This method was generated by MyBatis Generator. This method corresponds to the database table users 
* @mbggenerated Fri Aug 03 09:28:44 BST 2012 
*/ 
int updateByExample(@Param("record") User record, 
     @Param("example") UserExample example); 
} 

我的彈簧servlet.xml文件是

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context" 
xmlns:mvc="http://www.springframework.org/schema/mvc" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.1.xsd 
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> 


<!-- Enable annotation driven controllers, validation etc... --> 
<mvc:annotation-driven /> 


<context:component-scan 
base-package="com.mycom.myproject" /> 

<mvc:resources mapping="/resources/**" location="/resources/" /> 


<bean id="datasource" class="org.apache.commons.dbcp.BasicDataSource"> 
<property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
<property name="url" value="jdbc:mysql://localhost/mydatabase"/> 
<property name="username" value="root"/> 
<property name="password" value="root"/> 
</bean> 

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 
    <property name="dataSource" ref="datasource" /> 
</bean> 

<!-- scan for mappers and will automatically scan the whole classpath for xmls --> 
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 
    <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
    <property name="basePackage" value="com.mycom.myproject.db.mybatis.dao" /> 
</bean> 

<bean id="viewResolver" 
class="org.springframework.web.servlet.view.UrlBasedViewResolver"> 
<property name="viewClass" 
    value="org.springframework.web.servlet.view.JstlView" /> 
<property name="prefix" value="/WEB-INF/jsp/" /> 
<property name="suffix" value=".jsp" /> 
</bean> 

現在我quetsion是如果我願意，我可以如何獲得用戶列表或簡單的用戶帳戶。我在mysql數據庫的用戶表中有許多用戶。

我寫了一個樣本控制器類

@Controller 
@RequestMapping("/") 
public class LoginController 
{ 
static final Logger logger = Logger.getLogger(LoginController.class); 

private UserMapper userMapper = null; 



@RequestMapping("/login") 
public ModelAndView login(@ModelAttribute User userBean, Model model){  

    return new ModelAndView("login", "userBean", userBean); 

} 

@Autowired 
public void setUserMapper(UserMapper userMapper) { 
    this.userMapper = userMapper; 
} 

} 

，但它給了我下面的錯誤。

Error creating bean with name 'loginController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.mycom.myproject.controller.LoginController.setUserMapper(com.mycom.myproject.db.mybatis.dao.UserMapper); nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.mycom.myproject.db.mybatis.dao.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {} 

Answer 1

在userMapper.xml可以閱讀：

<mapper namespace="com.mycom.myproject.db.mybatis.dao.UserMapper"> 

但在Spring配置

​​

我覺得應該是

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 
    <property name="basePackage" value="com.mycom.myproject.db.mybatis.dao" /> 
</bean>