Spring MVC + Spring + MyBatis 框架整合

本文介绍使用SSM框架开发web项目Demo.

一、创建一个web-Poject项目

　　1.导入相关jar文件至lib下。“相关jar文件” --提取密码 oraw

　　2.修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <!-- 加载spring容器 -->
   <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:app.xml</param-value>
  </context-param>

  <!-- 前端控制器 -->
  <servlet>
      <servlet-name>DispatcherServlet</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:springmvc-servlet.xml</param-value>
     </init-param>
  </servlet>

  <servlet-mapping>
          <servlet-name>DispatcherServlet</servlet-name>
          <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 解决post方式的乱码的过滤器 -->
  <filter>
      <filter-name>characterEncodingFilter</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <init-param>
          <param-name>encoding</param-name>
          <param-value>UTF-8</param-value>
      </init-param>
  </filter>

  <filter-mapping>
          <filter-name>characterEncodingFilter</filter-name>
          <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

二、创建相关配置文件。

　　1.mybatis核心配置文件---mybatis-config.xml

<?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">
        <!-- 配置懒加载 -->
    <configuration>
        <settings>
            <setting name="lazyLoadingEnabled" value="false" />
        </settings>
        
　　　　<!-- 配置别名 -->
       <typeAliases>
           <package name="com.test.pojo"/>
       </typeAliases>
   </configuration>  

　　2.创建jdbc.properties文件，用于连接数据库相关配置(案例连接mysql数据库)

 driverClassName=com.mysql.jdbc.Driver
 url=jdbc\:mysql\://localhost\:端口号/数据库名?useUnicode\=true&characterEncoding\=UTF-8
 password=ok
 uname=root

注意:需要改写上面文件中的端口号和数据库名方可使用，mysql默认端口为3306；

　　3.创建spring核心配置文件，本文案例名称为app.xml，可根据自己喜好起名(特殊字符除外)，但是要和web.xml映射的spring配置文件名一致。

<?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: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-3.0.xsd
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- 扫包(service层) -->
    <context:component-scan base-package="com.test.service" />

    <!-- 导入连接池配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!-- 数据源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close" scope="singleton">
        <property name="driverClassName" value="${driverClassName}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${uname}"></property>
        <property name="password" value="${password}"></property>
    </bean>

    <!-- 配置mybatis SqlSessionFactoryBean -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis-config.xml" />
    </bean>

    <!-- Mapper接口所在包名，Spring会自动查找其下的Mapper -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.test.mapper" />
    </bean>

    <!-- 事务管理器 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 事务管理 -->
    <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="add*" propagation="REQUIRED" read-only="false"
                isolation="DEFAULT" />
            <tx:method name="del*" propagation="REQUIRED" read-only="false"
                isolation="DEFAULT" />
            <tx:method name="update*" propagation="REQUIRED" read-only="false"
                isolation="DEFAULT" />
            <tx:method name="get*" propagation="NEVER" read-only="true" />
            <tx:method name="query*" propagation="NEVER" read-only="true" />
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <!-- 定义切点 -->
        <aop:pointcut expression="execution(* com.test.service..*.*(..))"
            id="pointCut" />
        <aop:advisor advice-ref="transactionAdvice" pointcut-ref="pointCut" />
    </aop:config>
</beans>

　　4.创建springmvc核心配置文件，本文案例名称为springmvc-servlet.xml，可根据自己喜好起名(特殊字符除外)，但是要和web.xml中前端控制器映射的配置文件名一致。

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
              http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc.xsd">

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

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean
                class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json</value>
                    </list>
                </property>
                <property name="features">
                    <list>
                        <value>WriteDateUseDateFormat</value>
                    </list>
                </property>
            </bean>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="favorParameter" value="true"></property>
        <property name="mediaTypes">
            <map>
                <entry key="json" value="application/json;charset=UTF-8"></entry>
                <entry key="html" value="text/html;charset=UTF-8"></entry>
            </map>
        </property>
        <property name="viewResolvers">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="prefix" value="/WEB-INF/jsp/"></property>
                    <property name="suffix" value=".jsp"></property>
                </bean>
            </list>
        </property>
    </bean>
</beans> 

三、创建需要的包。

先创建一个简单的数据库。别忘记修改jdbc.properties文件连接数据库相关配置。

1.实体类、2.控制器 3.数据访问层 4.业务逻辑层

1.创建实体类----属性和数据库字段名最好一致，方便映射。

 package com.test.pojo;

 public class Person {
     private int id;
     private String name;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
 }

2.创建mapper接口和mapper.xml，注意mapper接口和mapper.xml文件名一致，扫包spring容器管理机制.

　　（1）mapper接口。(查询操作)

package com.test.mapper;

import java.util.List;

import com.test.pojo.Person;

public interface PersonMapper {
    List<Person> getPerson();//查询所有数据
}

　　（2）mapper.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper SYSTEM "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 <mapper namespace="com.test.mapper.PersonMapper">
     <select id="getPerson" resultType="Person">
         SELECT * FROM person
     </select>
 </mapper>

3.创建service层。

　　（1）service接口

 package com.test.service;

 import java.util.List;

 import com.test.pojo.Person;

 public interface PersonService {
     List<Person> getPerson();
 }

　　（2）service实现类

 package com.test.service;

 import java.util.List;

 import javax.annotation.Resource;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 import com.test.mapper.PersonMapper;
 import com.test.pojo.Person;

 @Service
 public class PersonServiceImp implements PersonService {

     //两种注入方式 任选其一 

     // @Resource注入，按名称注入 名称为mapper接口名首字母小写
     @Resource(name = "personMapper")
     private PersonMapper personMapper;

     /* @Autowired注入，按类型注入
     @Autowired
     private PersonMapper personMapper;*/

     @Override
     public List<Person> getPerson() {
         return personMapper.getPerson();
     }

 }

4.创建控制器。

package com.test.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.test.pojo.Person;
import com.test.service.PersonService;

@Controller
public class PersonController {

	@Autowired
	private PersonService personService;
	
　　　　 //返回json格式数据
	@RequestMapping("/index")
	@ResponseBody
	public Object show(){
		List<Person> list = personService.getPerson();
		return list;
	}
}

　　

5.部署项目运行。