在春季和mybatis配置中注入bean

Question

我正在嘗試使用Spring 3配置mybatis。出現以下錯誤

 Error creating bean with name 'loginController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'userMapper' is defined

對於UserMapper接口，我已經這樣做了。

@Service("userMapper")
@Transactional
public interface UserMapper {

 // methods here

}

我的控制器課程是

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

@Resource(name = "userMapper")
private UserMapper userMapper;

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


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

}

}

我的spring-servelet.xml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 class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.mycom.mydatabase.db.mybatis.sqlmap" />
</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>

因此，如何在這里注入依賴項並可以訪問我的數據庫方法。 如果有任何不清楚的地方，請讓我現在。

Answer 1

在您的UserMapper界面中，寫下如下內容-

  public interface UserMapper {

//for example, saveUser will save data in your table taking User as bean
public void saveUser(User user);
}

然后維護一個UserMapper.xml文件，如下所示-

    <?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.puneet.persistance.UserMapper">  
<insert id="saveUser" parameterType="com.puneet.spring3.beans.User">
        INSERT INTO USER (username,password) 
        VALUES (#{username},#{password})
    </insert>
</mapper>

在上面的xml文件中，我們提到了查詢和您要參考的接口。

在LoginController中，如下調用您的方法-

@RequestMapping(method=RequestMethod.POST)
    public ModelAndView add(@ModelAttribute(value="user")User user,BindingResult result){

        ModelAndView mv = new ModelAndView("yourjpspage");
        if(!result.hasErrors()){
            userMapper.saveUser(user);
            user = new User();

        }
        return mv;
    }

最后，在spring-servelet.xml文件中維護所有配置。

希望首先能對您有所幫助。

Answer 2

UserMapper是一個接口，因此無法注入。 您需要在XML配置中配置一個實現。