搭建基于maven的单模块springmvc + mybatis 二

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#idea #mybatis #maven #spring mvc

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本文详细介绍了如何在IDEA环境中利用Maven搭建SpringMVC与MyBatis整合的项目，并配置了编码过滤器、数据库连接池及事务管理等功能。

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上一篇已经讲述了如何在IDEA中基于maven搭建springMVC框架，本篇在之前的基础上集成了mybatis功能。主要工作如下：
1）升级web.xml，增加编码过滤器功能，将dispatcher-servlet.xml和applicationContext.xml移至resources目录下；
2）升级applicationContext.xml，将mybatis配置项放置到该文件；且将数据库配置项移至jdbc.properties ；
3）按照层次结构创建controller、pojo、service、dao各个层的类；
4）创建数据库及测试表；
5）配置pom依赖包；

组织结构如下图所示

1 web.xml

增加了对中文的编码过滤器

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Archetype Created Web Application</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 编码过滤器 -->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <async-supported>true</async-supported>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

2 应用上下文和dispatcher配置项

2.1 dispatcher-servlet.xml基本没变化

<?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:mvc="http://www.springframework.org/schema/mvc"
       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.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--此文件负责整个mvc中的配置-->

    <!-- 自动扫描该包，使用SpringMVC认为包下用了@Controller注解的类是控制器,避免扫描@Service导致事务不能使用 -->
    <context:component-scan base-package = "com.uzone.controller">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!--启用spring的一些annotation -->
    <context:annotation-config/>

    <!-- 配置注解驱动 可以将request参数绑定到controller参数上 -->
    <mvc:annotation-driven/>

    <!--避免IE执行AJAX时，返回JSON出现下载文件 -->
    <bean id = "mappingJacksonHttpMessageConverter"
          class = "org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name = "supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    <!--静态资源映射-->
    <!--本项目把静态资源放在了webapp的statics目录下，资源映射如下-->
    <mvc:resources mapping="/css/**" location="/WEB-INF/statics/css/"/>
    <mvc:resources mapping="/js/**" location="/WEB-INF/statics/js/"/>
    <mvc:resources mapping="/image/**" location="/WEB-INF/statics/image/"/>

    <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀(如果最后一个还是表示文件夹,则最后的斜杠不要漏了) 使用JSP-->
    <!-- 默认的视图解析器 在上边的解析错误时使用 (默认使用html)- -->
    <bean id="defaultViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/view/"/><!--设置JSP文件的目录位置-->
        <property name="suffix" value=".jsp"/>
        <property name="exposeContextBeansAsAttributes" value="true"/>
    </bean>


</beans>

2.2 applicationContext.xml
配置mybatis、配置事务、自动扫描controller和service层

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

    <!-- 自动扫描 -->
    <context:component-scan base-package="com.uzone"/>

    <!-- 引入数据库配置文件 -->
    <bean id = "propertyConfigurer"
          class = "org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
        <property name = "location" value="classpath:jdbc.properties" />
    </bean>
    <!-- 连接池 -->
    <bean id = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource"
          destroy-method = "close">
        <property name="driverClassName" value="${driverClass}"/>
        <property name="url" value="${jdbcUrl}"/>
        <property name="username" value="${username}"/>
        <property name="password" value="${password}"/>
        <!-- 初始化连接大小 -->
        <property name="initialSize" value="${initialSize}"></property>
        <!-- 连接池最大数量 -->
        <property name="maxActive" value="${maxActive}"></property>
        <!-- 连接池最大空闲 -->
        <property name="maxIdle" value="${maxIdle}"></property>
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="${minIdle}"></property>
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="${maxWait}"></property>
    </bean>

    <!-- 结合Spring和Mybatis -->
    <bean id = "sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapping.xml文件 -->
        <property name = "mapperLocations" value="classpath:mapping/*.xml" />
    </bean>

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

    <!-- 定义事务 -->
    <bean id = "transactionManager"
          class = "org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name = "dataSource" ref = "dataSource" />
    </bean>
    <!-- 使用注解定义事务 -->
    <tx:annotation-driven transaction-manager = "transactionManager" />
</beans>

2.3 jdbc.properties

driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://192.168.0.5:3306/test?useUnicode=true&characterEncoding=utf-8
username=root
password=******
#定义初始连接数
initialSize=0
#定义最大连接数
maxActive=20
#定义最大空闲
maxIdle=20
#定义最小空闲
minIdle=1
#定义最长等待时间
maxWait=3600

2.4 log4j.properties

log4j.rootLogger=INFO,Console,File
#控制台日志
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%p][%t][%d{yyyy-MM-dd HH\:mm\:ss}][%C] - %m%n
#普通文件日志
log4j.appender.File=org.apache.log4j.RollingFileAppender
log4j.appender.File.File=logs/ssm.log
log4j.appender.File.MaxFileSize=10MB
#输出日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold=ALL
log4j.appender.File.layout=org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern=[%p][%t][%d{yyyy-MM-dd HH\:mm\:ss}][%C] - %m%n
#设置输出日志文件编码
log4j.appender.File.Encoding=UTF-8

3 搭建控制层服务层实体层和数据访问层类及依赖关系

3.1 POJO

package com.uzone.pojo;

public class Test {
    private Integer id;

    private Integer test1;

    private String test2;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getTest1() {
        return test1;
    }

    public void setTest1(Integer test1) {
        this.test1 = test1;
    }

    public String getTest2() {
        return test2;
    }

    public void setTest2(String test2) {
        this.test2 = test2;
    }

}

3.2 service接口

package com.uzone.service;


import com.uzone.pojo.Test;

public interface TestService {
    Test getById(int id);
}

3.3 service实现

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

@Service("testService")
public class TestServiceImp implements TestService {
    @Autowired(required = false)
    private TestMapper testMapper = null;

    public Test getById(int id) {
        return testMapper.selectByPrimaryKey(id);
    }
}

3.4 DAO 接口


public interface TestMapper {
    Test selectByPrimaryKey(Integer id);
}

3.5 mapping （在resources目录下，通过applicationContext.xml配置）

<?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.uzone.dao.TestMapper">
    <resultMap id="BaseResultMap" type="com.uzone.pojo.Test">
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="test1" property="test1" jdbcType="INTEGER" />
        <result column="test2" property="test2" jdbcType="VARCHAR" />
    </resultMap>
    <sql id = "Base_Column_List">
        id, test1, test2
    </sql>
    <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
        SELECT
        <include refid="Base_Column_List" />
        FROM test
        WHERE id = #{id, jdbcType = INTEGER}
    </select>
</mapper>

3.6 Controller

<?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.uzone.dao.TestMapper">
    <resultMap id="BaseResultMap" type="com.uzone.pojo.Test">
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="test1" property="test1" jdbcType="INTEGER" />
        <result column="test2" property="test2" jdbcType="VARCHAR" />
    </resultMap>
    <sql id = "Base_Column_List">
        id, test1, test2
    </sql>
    <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
        SELECT
        <include refid="Base_Column_List" />
        FROM test
        WHERE id = #{id, jdbcType = INTEGER}
    </select>
</mapper>

4数据库及表

5 pom依赖包

下面的包基本是最小依赖包

<properties>
    <!-- spring版本号 -->
    <spring.version>4.2.6.RELEASE</spring.version>
    <!-- mybatis版本号 -->
    <mybatis.version>3.4.0</mybatis.version>
    <!-- mysql驱动版本号 -->
    <mysql-driver.version>5.1.35</mysql-driver.version>
    <!-- log4j日志包版本号 -->
    <slf4j.version>1.7.21</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
</properties>

<dependencies>
    <!--J2EE-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!--springframework-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!-- 添加mybatis依赖 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>${mybatis.version}</version>
    </dependency>
    <!-- 添加mybatis/spring整合包依赖 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.0</version>
    </dependency>

    <!-- 添加mysql驱动依赖 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql-driver.version}</version>
    </dependency>
    <!-- 导入连接池dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
    <dependency>
        <groupId>commons-dbcp</groupId>
        <artifactId>commons-dbcp</artifactId>
        <version>1.2.2</version>
    </dependency>
    <!-- 格式化对象，方便输出日志 添加fastjson -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.1.41</version>
    </dependency>
    <!--测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <!--日志-->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${log4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${slf4j.version}</version>
    </dependency>

    <!--其他需要的包-->
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.4</version>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!-- 添加fastjson -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.1.41</version>
    </dependency>

</dependencies>