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SpringMVC和Mybatis的整合的工作原理

SpringMVC和Mybatis的整合
馬克- to-win：馬克 java社區(qū)：防盜版實(shí)名手機(jī)尾號(hào)： 73203
在做這個(gè)項(xiàng)目之前，我們的前提條件是：你已經(jīng)有一個(gè)能運(yùn)行的SpringMVC的最簡單的項(xiàng)目了。請(qǐng)同學(xué)們參考我的SpringMVC那章。做這個(gè)項(xiàng)目關(guān)鍵在于導(dǎo)包，請(qǐng)參考下圖：

SpringMVC和Mybatis的整合的工作原理

馬克-to-win： org.mybatis.spring.mapper.MapperScannerConfigurer會(huì)自動(dòng)往Spring容器注入 com.mapper目錄下所有的Mapper比如RegisterMapper（這就是為什么在Controller當(dāng)中你能用@Resource注解找到RegisterMapper的實(shí)例的原因），條件是org.mybatis.spring.SqlSessionFactoryBean類的實(shí)例已經(jīng)在Spring容器中（實(shí)際上id是多少都無所謂，這里就是sqlSessionFactoryqqqq，因?yàn)榉凑矝]有人調(diào)用它，只要有實(shí)例在容器中就行），有了它，MapperScannerConfigurer才能正常工作，因?yàn)镾qlSessionFactoryBean的一個(gè)屬性是 dataSource，它掌握著連接數(shù)據(jù)庫的密碼等。

例 1.4

<html>
<head>
    <title>Spring 3.0</title>
</head>
<body>
    <a href="helloa.do">Say Hello</a>
</body>
</html>

spring-servlet.xml:

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">

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

    <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>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" >
         <property name="driverClassName"
                      value="com.mysql.jdbc.Driver"></property>
         <property name="url"
                      value="jdbc:mysql://localhost:3306/test"></property>
         <property name="username"
                      value="root"></property>
         <property name="password"
                      value="1234"></property>
    </bean>

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

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

package com;
import java.io.IOException;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.mapper.RegisterMapper;

@Controller
public class HelloWorldController {
    @Resource
    private RegisterMapper registerMapper;
    @RequestMapping("/helloa")
    public void helloWorld(HttpServletResponse res) throws IOException {
        Register register = registerMapper.selectByPrimaryKey(1);
        System.out.println("register is "+register.toString());
        res.sendRedirect("index.jsp");
    }
}

運(yùn)行index.jsp以后，console輸出結(jié)果是：

register is id:1
name:張三
age:13

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Mybatis