Spring與Mybatis整合

Spring的作用? 幫我們管理項目中需要使用的幾乎所有對象的生命週期
使用Mybatis用到了哪些關鍵對象需要交給Spring管理(全局)
  1.核心對象SqlSessionFactory
  2.SqlSession
  3.Mapper映射器(全局)
 整合就是把以上三個對象交給uSpring管理
1.導入兩個框架需要的jar包
    單獨Mybatis的所有包
    Spring的核心包 4個 + 1個日誌 + AOP3個包 + tx事務一個包 + jdbc + test測試包 + 驅動包 + 連接池
    注意:mybatis-Spring整合包需要單獨下載 到gitgub中搜索
2.Spring配置文件
    1.配置數據庫相關參數(數據庫連接池)
    2.配置MyBatis的會話工廠 並給她注入連接池
3.Mybatis的映射文件

使用dao的實現類查詢對象

db.properties

配置文件 記錄數據庫信息
driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql:///MybatisDB
userName=root
password=12345

SqlMapConfig.xml

掃描com/lanou/dao包下接口與其對應的配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <mappers>
        <package name="com/lanou/dao"/>
    </mappers>
</configuration>

applicationContext.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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    <context:property-placeholder location="classpath:db.properties"/>

    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driverClass}"></property>
        <property name="jdbcUrl" value="${jdbcUrl}"></property>
        <property name="user" value="${userName}"></property>
        <property name="password" value="${password}"></property>
    </bean>
    <!-- 會話工廠 -->
    <bean name="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入連接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 類別名 後面不用再寫全限定類名了 -->
        <property name="typeAliasesPackage" value="com.lanou.bean"></property>
        <!-- 指定Mybatis的配置文件的路徑 即上面的SqlMapConfig.xml的位置 -->
        <property name="configLocation" value="classpath:SqlMapConfig.xml"></property>
    </bean>
    <!-- 打開註解掃描 掃描類中的註解 -->
    <context:component-scan base-package="com.lanou"></context:component-scan>
</beans>

Dog.java

package com.lanou.bean;

public class Dog {
    private int id;
    private String nikename;
    private String gender;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getNikename() {
        return nikename;
    }
    public void setNikename(String nikename) {
        this.nikename = nikename;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @Override
    public String toString() {
        return "Dog [id=" + id + ", nikename=" + nikename + ", gender=" + gender + "]";
    }
}

DogDao.java

package com.lanou.dao;

import java.util.List;

import com.lanou.bean.Dog;

public interface DogDao {
    public List<Dog> selectAllDog();
}

DogDao.xml

<?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.lanou.dao.DogDao">
    <select id="selectAllDog" resultType="Dog">
        select * from Dog
    </select>
  </mapper>

DogDaoImpl.java

import java.util.List;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.lanou.bean.Dog;
import com.lanou.dao.DogDao;
@Repository
public class DogDaoImpl extends SqlSessionDaoSupport  implements DogDao{
    @Autowired
    @Override
    public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
        // TODO Auto-generated method stub
        super.setSqlSessionFactory(sqlSessionFactory);
    }

    @Override
    public List<Dog> selectAllDog() {
        List<Dog> list = getSqlSession().selectList("com.lanou.dao.DogDao.selectAllDog");
        System.out.println(list);
        return list;
    }

}

MyTest.java

import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.lanou.bean.Dog;
import com.lanou.dao.DogDao;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class MyTest {
    @Autowired
    private DogDao dogDao;
    @Test
    public void test1() {
        List<Dog> list = dogDao.selectAllDog();
        for (Dog dog : list) {
            System.out.println(dog);
        }
    }
}

使用代理類實現查詢操作

刪除上面的DogDaoImpl類  用代理類實現時  就不需要自己創建實現類了
然後對配置applicationContext文件進行修改 其餘不變

applicationContext.xml

可刪除
<property name="configLocation" value="classpath:SqlMapConfig.xml" ></property>
再在裏面添加上這段即可
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.lanou.dao"></property>
</bean>
讓Mybatis自動生成接口的代理實現類 該類用來掃描一堆映射文件 並生成代理
這時已經不再需要SqlMapConfig.xml映射文件了
也不再需要dao層接口的實現類
前提 接口類與映射文件在同一目錄下並且名字一致 如果 如果不在同一級 或 名字不同 
需要在sqlSessionFactory中使用mapperslocations來指定映射文件
運行結果不變

將配置文件與接口類非別放在不同包下

即DogDao放在.java放在com.lanou.dao包下
DogDao.xml 放在com.lanou.mappers包下

applicationContext.xml

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

<bean name="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="typeAliasesPackage" value="com.lanou.bean"></property>
    <property name="mapperLocations" value="classpath:com/lanou/mappers/*.xml"></property>
</bean>

添加事務

applicationContext.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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    <context:property-placeholder location="classpath:db.properties"/>

    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driverClass}"></property>
        <property name="jdbcUrl" value="${jdbcUrl}"></property>
        <property name="user" value="${userName}"></property>
        <property name="password" value="${password}"></property>
    </bean>

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

    <bean name="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="typeAliasesPackage" value="com.lanou.bean"></property>
        <property name="mapperLocations" value="classpath:com/lanou/mappers/*.xml"></property>
    </bean>

    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <tx:annotation-driven/>
    <context:component-scan base-package="com.lanou"></context:component-scan>
</beans>

DogDao.java

public interface DogDao {
    public List<Dog> selectAllDog();
    public int insertDog(Dog dog);
}

DogDao.xml

<?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.lanou.dao.DogDao">
    <select id="selectAllDog" resultType="Dog">
        select * from Dog
    </select>

      <insert id="insertDog">
        insert into dog values(
        null,
        #{nikename},
        #{gender}
        )
    </insert>
   </mapper>

MyTest.java

@Test
public void test2() {
    Dog dog = new Dog();
    dog.setGender("公");
    dog.setNikename("小黑黑");

    Dog dog2 = new Dog();
    dog2.setGender("母");
    dog2.setNikename("小紅紅");
    dogDao.insertDog(dog);
    int a = 1/0;
    dogDao.insertDog(dog2);

}

@Transactional(添加事務註解)

未添加事務註解時 dog會被插入數據庫  然後遇到錯誤 dog2不會插入數據庫
當添加事務註解時 dog會被插入數據庫 事務還沒提交  然後遇到錯誤 事務回滾 dog與dog2都
不會插入數據庫

示例

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>SpringMVC02</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 配置SpringMVC的核心控制器 -->
  <servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 指定SpringMVC配置文件路徑 注意:Spring配置文件寫在最外層 用<context-param>
         這裏必須寫Servlet標籤中間 用<init-param> -->
     <!-- 當創建DispatcherServlet類的時候 必須給其指定的參數 -->
    <init-param>
        <!-- 配置文件寫的所有屬性 都是java類中的屬性 所有名字必須一樣 -->
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:SpringMVC-servlet.xml</param-value>
    </init-param>
  </servlet>
  <!-- 地址映射 哪些請求交給SpringMVC處理 -->
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <!-- 
        1. /* 攔截所有請求 包括靜態資源
        2. *. action || *.do 攔截以.action結束的請求
        3. /  攔截所有請求 jsp除外
    -->
    <!-- 攔截下來交給DispatcherServlet處理 -->
    <url-pattern>*.action</url-pattern>
  </servlet-mapping>
</web-app>

SpringMVC-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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    <!-- 整合SpringMVC和Mybatis -->
    <!-- 數據庫連接池 -->
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql:///MVCDB" />
        <property name="user" value="root" />
        <property name="password" value="123456" />
    </bean>
    <!-- 會話工廠 -->
    <bean name="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 連接池 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 掃描接口與其對應的映射文件 同一目錄 並且名字相同 -->
    <bean name="mapper" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lanou.dao"></property>
    </bean>
    <!-- 事務管理 -->
    <bean name="transactionManager"  class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 事務註解 -->
    <tx:annotation-driven/>

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

Student.java

public class Student {
    private int s_id;
    private String s_name;
    private String s_gender;
    private int s_age;
    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Student(int s_id, String s_name, String s_gender, int s_age) {
        super();
        this.s_id = s_id;
        this.s_name = s_name;
        this.s_gender = s_gender;
        this.s_age = s_age;
    }
    public int getS_id() {
        return s_id;
    }
    public void setS_id(int s_id) {
        this.s_id = s_id;
    }
    public String getS_name() {
        return s_name;
    }
    public void setS_name(String s_name) {
        this.s_name = s_name;
    }
    public String getS_gender() {
        return s_gender;
    }
    public void setS_gender(String s_gender) {
        this.s_gender = s_gender;
    }
    public int getS_age() {
        return s_age;
    }
    public void setS_age(int s_age) {
        this.s_age = s_age;
    }
    @Override
    public String toString() {
        return "User [s_id=" + s_id + ", s_name=" + s_name + ", s_gender=" + s_gender + ", s_age=" + s_age + "]";
    }
}

StudentController.java

@Controller
public class StudentController {
    @Autowired
    private StudentService studentService;
    @RequestMapping("getStudent.action")
    public ModelAndView test(int id) {
        System.out.println("123");
        ModelAndView mv = new ModelAndView();
        Student student = studentService.selectStudentById(id);
        mv.setViewName("2.jsp");
        mv.addObject("student",student);
        return mv;
    }
}

StudentDao.java

public interface StudentDao {
    public Student getStudentById(int id);
}

StudentDao.xml

<?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.lanou.dao.StudentDao">
    <select id="getStudentById" resultType="com.lanou.bean.Student">
        select * from Student where s_id = #{param}
    </select>
 </mapper>

StudentService.java

public interface StudentService {
    public Student selectStudentById(int id);
}

StudentServiceImpl.java

@Service
public class StudentServiceImpl implements StudentService{
    @Autowired
    private StudentDao studentDao;

    @Override
    public Student selectStudentById(int id) {
        // TODO Auto-generated method stub
        Student student = studentDao.getStudentById(id);
        return student;
    }

}

2.jsp

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h1>${student.s_name }</h1>
    <h2>${student.s_age }</h2>
</body>
</html>

SpringMVC的三大主鍵

1.映射處理器 HandleMapping
    負責根據請求對象找到一個可以處理請求的Controller.
    默認使用的是BeanNameUrlHandlerMapping
    接收到請求地址作爲name到容器中查找對應的bean
    例如請求了 xxxx/getUsers.action
    把getUser.action作爲name到容器中找bean對象
2.處理適配器
    負責映射參數 調用Controller 並返回ModelAndAction
3.視圖解析器
    負責解析ModelAndView中的視圖物理地址
    以及將modelAndView中參數放入request中

如果不行使用默認的映射處理器 可以到容器中手動指定(瞭解即可 無需掌握)
目前SpringMVC要想實現一個controller處理多個請求 只能使用註解

指定視圖解析器

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!-- 確定視圖的具體路徑 -->
    <!-- 前綴prefix -->
    <property name="prefix" value="views/jsp/"></property>
    <!-- 後綴suffix -->
    <property name="suffix" value=".jsp"></property>
</bean>

相當於views/jsp/ + test + .jsp

UserController

@Controller
public class UserController{
    @RequestMapping("/getUsers.action")
    public ModelAndView getUser() {
        ModelAndView mv = new ModelAndView();
        mv.setViewName("test");
        return mv;
    }
}

test.jsp

</head>
<body>
    測試視圖解析器 地址拼接
</body>
</html>

#### web.xml

    <!-- 配置SpringMVC的核心控制器 -->
    <servlet>
        <servlet-name>Spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 指定SpringMVC配置文件路徑 注意:Spring配置文件寫在最外層用<context-param>
            這裏必須寫到Servlet標籤中間 用<init-param>
         -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:SpringMVC-servlet.xml</param-value>
        </init-param>   
    </servlet>

    <servlet-mapping>
        <servlet-name>Spring</servlet-name>
            <!-- 
                1./* 攔截所有請求  包括靜態資源
                2.*.action  ||   *.do  攔截一.action結束的請求
                3./ 攔截所有請求 jsp除外  
             -->
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

Mybatis與spring整合 SpringMVC

Spring與Mybatis整合

使用dao的實現類查詢對象

db.properties

SqlMapConfig.xml

applicationContext.xml

Dog.java

DogDao.java

DogDao.xml

DogDaoImpl.java

MyTest.java

使用代理類實現查詢操作

applicationContext.xml

將配置文件與接口類非別放在不同包下

applicationContext.xml

添加事務

applicationContext.xml

DogDao.java

DogDao.xml

MyTest.java

@Transactional(添加事務註解)

示例

web.xml

SpringMVC-servlet.xml

Student.java

StudentController.java

StudentDao.java

StudentDao.xml

StudentService.java

StudentServiceImpl.java

2.jsp

SpringMVC的三大主鍵

指定視圖解析器

UserController

test.jsp