spring与MyBatis结合

下面将介绍使用spring+mybatis的开发样例：

    首先，笔者创建的是一个maven工程，在开发先先导入相关的依赖jar：

    pom.xml:

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!-- spring3 相关依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <!-- spring MVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>3.0.5.RELEASE</version>
        </dependency>
        <!-- mysql jdbc driver -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.13</version>
        </dependency>
        <!-- log 日志 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.2</version>
        </dependency>
        <!-- mybatis-spring 插件 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.1</version>
        </dependency>
        <!-- mybatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.1</version>
        </dependency>
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>proxool</groupId>
            <artifactId>proxool</artifactId>
            <version>0.9.1</version>
        </dependency>
        <dependency>
            <groupId>proxool</groupId>
            <artifactId>proxool-cglib</artifactId>
            <version>0.9.1</version>
        </dependency>
        <!-- servlet-jsp 依赖，为编译jsp时使用 -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    

 web.xml中对spring和数据库连接池的配置：

    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/log4j.xml</param-value>
    </context-param>
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

    <!-- needed for ContextLoaderListener -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>

    <!-- Bootstraps the root web application context before servlet initialization -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- The front controller of this Spring Web application, responsible for 
        handling all application requests -->
    <servlet>
        <servlet-name>spring3</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>

    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>spring3</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- database proxool config -->
    <servlet>
        <servlet-name>ServletConfigurator</servlet-name>
        <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
        <init-param>
            <param-name>xmlFile</param-name>
            <param-value>WEB-INF/proxool.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

在这里要注意，因为我使用了数据库连接池proxool，虽然已经设置servlet的启动级别是1，但是由于在servlet启动之前，spring（ContextLoaderListener）监听器已启动了，所以在spring监听启动时它会报一个找不到对应的数据源的SQLException。对于这个问题，本可以通过更改spring为servlet启动，并将启动级别设置为proxool配置加载之后解决：

 <servlet>
    <servlet-name>contextConfigLocation</servlet-name>
    <servlet-class>
             org.springframework.web.context.ContextLoaderServlet
    </servlet-class>
    <load-on-startup>2</load-on-startup>
 </servlet>

但是因为spring3以后就不支持使用servlet启动了，官方推荐使用listener启动applicationContext。所以这个方法在新版本不适合了，不过这个异常可以忽略，因为proxool在整个项目加载完成的时候的确以及完成了加载，所以在项目运行起来以后是不会报错的，开始报错是spring做的一个检查。

    为了解决乱码问题最好在web.xml中加上这个配置：

    <!-- character filter. use UTF8 -->
    <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>

  下面是对spring3-servlet.xml的配置，它里面申明的bean都存放在webApplicationContext中：

<?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:mvc="http://www.springframework.org/schema/mvc"
    default-lazy-init="false" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        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.pinche.statistic.web"></context:component-scan>
    <!-- 启用spring mvc注解 -->
    <mvc:annotation-driven />
    <!-- 静态资源访问问题 -->
    <mvc:default-servlet-handler />
    <!-- Default ViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/page/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!-- 对抛给spring的异常的处理 -->
    <bean id="exceptionResolver"
        class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.lang.Exception">error</prop>
            </props>
        </property>
    </bean>
</beans>

   下面对applicationContext.xml进行配置（这里使用了两个数据源）：

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

    <!--
        数据源配置：这里配置了两个数据源dataSource_statistic和dataSource_pinche，
    分别注入到_sqlSessionFactory_statistic和_sqlSessionFactory_pinche
    -->
    <bean id="dataSource_statistic"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!-- 数据库连接 -->
        <property name="url" value="proxool.statistic" /> 
        <!--
        这是不使用数据库连接池的配置方式，由于proxool只有在启动web应用的时候才能加载，
        所以如果在初期开发阶段可以用这种简单的数据库连接方式，在通过
        new FileSystemXmlApplicationContext("src/main/webapp/WEB-INF/applicationContext.xml")
        获取到context，并进行测试。
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://192.168.1.168:3306/statistic"/>
        <property name="username" value="statistic"></property>
        <property name="password" value="statistic"></property> 
         -->
    </bean>
    <bean id="dataSource_pinche"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!-- 数据库连接 -->
        <property name="url" value="proxool.pinche" /> 
    </bean>
    
    <!-- 为mybatis-spring注入数据源 -->
    <bean name="_sqlSessionFactory_statistic" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource_statistic"></property>
        <!-- 注入别名的包名前缀，这样就可以在mybatis的文件中直接写类名不用写全名了 -->
        <property name="typeAliasesPackage" value="com.pinche.statistic.domain" />
    </bean>
    <bean name="_sqlSessionFactory_pinche" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource_pinche"></property>
        <!-- 注入别名的包名前缀，这样就可以在mybatis的文件中直接写类名不用写全名了 -->
        <property name="typeAliasesPackage" value="com.pinche.statistic.domain" />
        <!-- 该配置文件用来指定Mapper映射文件的位置 ，如果映射文件与相应的接口同名，且在同一路径下，那么可以不配置该选项-->
        <!--<property name="mapperLocations" value="src/UserMapper.xml"/>-->
        <!--
            该属性用来指定MyBatis的XML配置文件路径,跟Spring整合时，
            编写MyBatis映射文件的目的无非是配置一下typeAlias、setting之类的
            元素。不用在其中指定数据源，或者事务处理方式。就算配置了也会被忽略。
            因为这些都是使用Spring中的配置。当然如果你不打算添加typeAlias 之
            类的设置的话，你连MyBatis的配置文件都不用写，更不用配置这个属性了
        -->
        <!-- <property name="configLocation" value=""/> -->
    </bean>
    <!--
        注册Mapper方式一
        <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> 
            <property name="mapperInterface" value="com.pinche.statistic.mapper.ApplicationsMapper"/> 
            <property name="sqlSessionFactory" ref="_sqlSessionFactory_statistic"/> 
        </bean>
    -->
    <!-- 注册Mapper方式二：也可不指定特定mapper，而使用自动扫描包的方式来注册各种Mapper ，配置如下：-->
    <!-- 
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.pinche.statistic.mapper"></property>
    </bean>  
    -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.pinche.statistic.dialstatistic.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="_sqlSessionFactory_pinche"></property>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.pinche.statistic.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="_sqlSessionFactory_statistic"></property>
    </bean> 
    
    <!-- 事务 -->
    <!-- 虽然mybatis也有自己的事务配置，但是配置了也没用，事务最终会交由spring控制，
    由于项目没有用到可以注掉。 
    -->
    <!-- <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource_statistic" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager"/> -->
    
    <!-- 启用注解 -->
    <context:annotation-config />
    
    <!-- 自动扫描注入 -->
    <context:component-scan
        base-package="com.pinche.statistic.dao,
                com.pinche.statistic.service" />
</beans>

    Application.java是下面会用到的一个实体bean：

public class Application {

    public static final int APP_DISABLE = 0;
    public static final int APP_ENABLE = 1;
    private Integer id;
    private String appAccount;//每个app对应一个账户标识；对应生成的数据表
    private String appName;
    private String appICON;
    private String appDesc;
    private String appURL;
    private Date createTime;
    private int isDisable;//'是否前台显示：0显示，1不显示' 
}

  首先我们要编写一个与mapper.xml文件映射的接口文件，mybatis会将这个接口文件和对应的mapper文件中的sql语句关联，自动实现这个接口文件。在之后的开发中我们直接调用这个接口文件就可以了，因为内存中已经有接口相对应的实例了。

ApplicationsMapper.xml文件：

<?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.pinche.statistic.mapper.ApplicationsMapper">

    <insert id="add" parameterType="Application" useGeneratedKeys="true"
        keyProperty="id">
        INSERT INTO applications
        (appName,appAccount,appICON,appDesc,appURL,createTime)
        VALUES
        (#{appName},#{appAccount},#{appICON},#{appDesc},#{appURL},#{createTime})
    </insert>

    <delete id="delete" parameterType="String">
        DELETE FROM applications WHERE
        appAccount = #{appAccount}
    </delete>

    <update id="update" parameterType="Application">
        UPDATE applications
        <set>
            <if test=" appName != '' and appName != null ">
                appName = #{appName},
            </if>
            <if test=" appICON != '' and appICON != null ">
                appICON = #{appICON},
            </if>
            <if test=" appDesc != '' and appDesc != null ">
                appDesc = #{appDesc},
            </if>
            <if test=" appURL != '' and appURL != null ">
                appURL = #{appURL},
            </if>
            <if test=" isDisable != -1 ">
                isDisable = #{isDisable}
            </if>
        </set>
        WHERE appAccount = #{appAccount}
    </update>

    <select id="findByAppAccount" resultType="Application"
        parameterType="String">
        select * from applications where appAccount =
        #{appAccount}
    </select>

    <select id="findAll" resultType="Application">
        select * from applications
    </select>
</mapper> 

   对ApplicationsMapper.xml文件的配置必须要注意的是它的命名空间是必须的，而且是对应接口文件的全名！并且每个sql语句的id属性和接口文件中的方法名一致！！

    下面是ApplicationsMapper.java文件，也就是对应的接口文件：

package com.pinche.statistic.mapper;

import java.util.List;

import com.pinche.statistic.domain.Application;

public interface ApplicationsMapper {

    void add(Application app);

    void delete(String appAccount);

    void update(Application app);

    Application findByAppAccount(String appAccount);

    List<Application> findAll();
}

通过以上的的配置，大家可以在test中测试一下自己的代码了

    @Test
    public void testCreateTable() {
        ApplicationContext aContext = new FileSystemXmlApplicationContext("src/main/webapp/WEB-INF/applicationContext.xml");
        ApplicationsMapper mapper = (ApplicationsMapper) aContext.getBean(ApplicationsMapper.class);
        
        Application app = new Application();
        app.setAppAccount("androidApp");
        
        mapper.add(app);
    }

以上测试了add方法，其他的测试方法大家可以照着写一写。如果插入成功恭喜，你的环境已经搭好了。

    接下来是将继续这个样例系统的Dao层，service层和controller层。

    这个dao层吧，项目中就是这么用的，不过现在通过大家的指正，mybatis提供了@param来解决多参数问题，ok，这么看来这个Dao层的确不需要了。

package com.pinche.statistic.dao;

import java.util.List;

import com.pinche.statistic.domain.Application;

public interface AppDao {
    boolean add(Application app);

    boolean delete(String appAccount);

    boolean update(Application app);

    Application findByAppAccount(String appAccount);
    
    List<Application> findAll();
}

package com.pinche.statistic.dao.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.stereotype.Repository;

import com.pinche.statistic.dao.AppDao;
import com.pinche.statistic.domain.Application;
import com.pinche.statistic.mapper.ApplicationsMapper;

@Repository
public class AppDaoImpl implements AppDao {

    @Autowired
    private ApplicationsMapper mapper;
    
    @Override
    public boolean add(Application app) {
        try {
            mapper.add(app);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean delete(String appAccount) {
        try {
            mapper.delete(appAccount);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean update(Application app) {
        try {
            mapper.update(app);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public Application findByAppAccount(String appAccount) {
        try {
            Application findByAppAccount = mapper.findByAppAccount(appAccount);
            return findByAppAccount;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public List<Application> findAll() {
        try {
            return mapper.findAll();
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return null;
    }
}

 自行设计的DAO层对象容器（在DAO对象很多时，如果在service层要调用对应的DAO还得手动注入，通过引用这个DAO层对象容器，可以实现在需要使用DAO时迅速找需要的DAO，省去了繁杂的手动注入，而且spring默认的bean都是单例的，无论在何处注入一个实体bean其实都是同一个。这样做更方便）：

package com.pinche.statistic.dao;

import java.lang.reflect.Field;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class BaseDAL {

    private static final Logger logger = LoggerFactory.getLogger(BaseDAL.class);
    
    @Autowired
    private AppDao _appDao;
    public static AppDao appDao;

    @Autowired
    private MetaDataDao _metaDataDao;
    public static MetaDataDao metaDataDao;

    @Autowired
    private DDLManager _DDLManager;
    public static DDLManager DDLManager;
    
    @Autowired
    private AnalyzeDao _analyzeDao;
    public static AnalyzeDao analyzeDao;
    
    @Autowired
    private DialstatisticsDao _dialstatisticsDao;
    public static DialstatisticsDao dialstatisticsDao;

    @PostConstruct
    public void init() {
        long start = System.currentTimeMillis();
        logger.debug("start init BaseDAL ...");
        try {

            Field[] fields = this.getClass().getDeclaredFields();

            for (int i = 0; i < fields.length; i++) {
                String fieldname = fields[i].getName();
                if (fieldname.startsWith("_")) {
                    String sfieldname = fieldname.substring(1);
                    Field sfield = this.getClass().getDeclaredField(sfieldname);
                    sfield.setAccessible(true);
                    sfield.set(this, fields[i].get(this));
                }
            }
            logger.debug("init BaseDAL OVER, consume = {}ms",
                    System.currentTimeMillis() - start);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

  如果使用了以上的层管理容器，如果要在容器中添加一个DAO（例如：DemoDao），只需在这个容器中添加一个这样的声明：

    @Autowired
    private DemoDao _demoDao;
    public static DemoDao demoDao;

package com.pinche.statistic.service;

import java.util.List;

import com.pinche.statistic.domain.Application;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
public interface AppService {
    
    Application find(String appAccount);
    
    boolean update(Application app);
    
    boolean setDisable(String appAccount);
    
    boolean setEnable(String appAccount);
    
    List<Application> findAll();
    
}

package com.pinche.statistic.service.impl;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.pinche.statistic.dao.BaseDAL;
import com.pinche.statistic.domain.Application;
import com.pinche.statistic.service.AppService;
import com.pinche.statistic.utils.SystemUtils;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
@Service
public class AppServiceImpl implements AppService {

    private static final Logger logger = LoggerFactory
            .getLogger(AppServiceImpl.class);

    @Override
    public Application find(String appAccount) {
        return BaseDAL.appDao.findByAppAccount(appAccount);
    }

    
    @Override
    public boolean update(Application app) {
        String appAccount = app.getAppAccount();
        if (appAccount == null && "".equals(appAccount)) {
            return true;
        }
        return BaseDAL.appDao.update(app);
    }

    @Override
    public boolean setDisable(String appAccount) {
        Application app = new Application();
        app.setAppAccount(appAccount);
        app.setIsDisable(Application.APP_DISABLE);
        return BaseDAL.appDao.update(app);
    }

    @Override
    public boolean setEnable(String appAccount) {
        Application app = new Application();
        app.setAppAccount(appAccount);
        app.setIsDisable(Application.APP_ENABLE);
        return BaseDAL.appDao.update(app);
    }

    @Override
    public List<Application> findAll() {
        return BaseDAL.appDao.findAll();
    }
}

 哈哈，使用层对象管理容器是不是很方便。通过一个引用就能获得所有的DAO支持。所以我在service层也构建了一个service层对象管理容器BaseBLL:

package com.pinche.statistic.service;

import java.lang.reflect.Field;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
@Service
public class BaseBLL {
    
    private static final Logger logger = LoggerFactory.getLogger(BaseBLL.class);
    
    @Autowired
    private AnalyzeService _analyzeService;
    public static AnalyzeService analyzeService;

    @Autowired
    private AppService _appService;
    public static AppService appService;

    @Autowired
    private MetaDataService _metaDataService;
    public static MetaDataService metaDataService;

    @PostConstruct
    public void init() {
        long start = System.currentTimeMillis();
        logger.debug("start init BaseBLL ...");
        try {

            Field[] fields = this.getClass().getDeclaredFields();

            for (int i = 0; i < fields.length; i++) {
                String fieldname = fields[i].getName();
                if (fieldname.startsWith("_")) {
                    String sfieldname = fieldname.substring(1);
                    Field sfield = this.getClass().getDeclaredField(sfieldname);
                    sfield.setAccessible(true);
                    sfield.set(this, fields[i].get(this));
                }
            }
            logger.debug("init BaseBLL OVER, consume = {}ms",
                    System.currentTimeMillis() - start);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

}

 好了下面应该是controller层的编写了，但是由于笔者以上的代码只是摘录了系统中的部分，而在controller中涉及到其他的内容，如果直接摘录可能和以上的代码衔接不上。所以这里就不进行了controller层的具体介绍了。本系统controller层使用的是SpringMVC，开发效率一级赞。

package com.pinche.statistic.dao;

import java.util.List;

import com.pinche.statistic.domain.Application;

public interface AppDao {
    boolean add(Application app);

    boolean delete(String appAccount);

    boolean update(Application app);

    Application findByAppAccount(String appAccount);
    
    List<Application> findAll();
}

package com.pinche.statistic.dao.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.stereotype.Repository;

import com.pinche.statistic.dao.AppDao;
import com.pinche.statistic.domain.Application;
import com.pinche.statistic.mapper.ApplicationsMapper;

@Repository
public class AppDaoImpl implements AppDao {

    @Autowired
    private ApplicationsMapper mapper;
    
    @Override
    public boolean add(Application app) {
        try {
            mapper.add(app);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean delete(String appAccount) {
        try {
            mapper.delete(appAccount);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean update(Application app) {
        try {
            mapper.update(app);
            return true;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public Application findByAppAccount(String appAccount) {
        try {
            Application findByAppAccount = mapper.findByAppAccount(appAccount);
            return findByAppAccount;
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public List<Application> findAll() {
        try {
            return mapper.findAll();
        } catch (DataAccessException e) {
            e.printStackTrace();
        }
        return null;
    }
}

 自行设计的DAO层对象容器（在DAO对象很多时，如果在service层要调用对应的DAO还得手动注入，通过引用这个DAO层对象容器，可以实现在需要使用DAO时迅速找需要的DAO，省去了繁杂的手动注入，而且spring默认的bean都是单例的，无论在何处注入一个实体bean其实都是同一个。这样做更方便）：

package com.pinche.statistic.dao;

import java.lang.reflect.Field;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class BaseDAL {

    private static final Logger logger = LoggerFactory.getLogger(BaseDAL.class);
    
    @Autowired
    private AppDao _appDao;
    public static AppDao appDao;

    @Autowired
    private MetaDataDao _metaDataDao;
    public static MetaDataDao metaDataDao;

    @Autowired
    private DDLManager _DDLManager;
    public static DDLManager DDLManager;
    
    @Autowired
    private AnalyzeDao _analyzeDao;
    public static AnalyzeDao analyzeDao;
    
    @Autowired
    private DialstatisticsDao _dialstatisticsDao;
    public static DialstatisticsDao dialstatisticsDao;

    @PostConstruct
    public void init() {
        long start = System.currentTimeMillis();
        logger.debug("start init BaseDAL ...");
        try {

            Field[] fields = this.getClass().getDeclaredFields();

            for (int i = 0; i < fields.length; i++) {
                String fieldname = fields[i].getName();
                if (fieldname.startsWith("_")) {
                    String sfieldname = fieldname.substring(1);
                    Field sfield = this.getClass().getDeclaredField(sfieldname);
                    sfield.setAccessible(true);
                    sfield.set(this, fields[i].get(this));
                }
            }
            logger.debug("init BaseDAL OVER, consume = {}ms",
                    System.currentTimeMillis() - start);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

如果使用了以上的层管理容器，如果要在容器中添加一个DAO（例如：DemoDao），只需在这个容器中添加一个这样的声明：

    @Autowired
    private DemoDao _demoDao;
    public static DemoDao demoDao;

package com.pinche.statistic.service;

import java.util.List;

import com.pinche.statistic.domain.Application;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
public interface AppService {
    
    Application find(String appAccount);
    
    boolean update(Application app);
    
    boolean setDisable(String appAccount);
    
    boolean setEnable(String appAccount);
    
    List<Application> findAll();
    
}

package com.pinche.statistic.service.impl;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.pinche.statistic.dao.BaseDAL;
import com.pinche.statistic.domain.Application;
import com.pinche.statistic.service.AppService;
import com.pinche.statistic.utils.SystemUtils;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
@Service
public class AppServiceImpl implements AppService {

    private static final Logger logger = LoggerFactory
            .getLogger(AppServiceImpl.class);

    @Override
    public Application find(String appAccount) {
        return BaseDAL.appDao.findByAppAccount(appAccount);
    }

    
    @Override
    public boolean update(Application app) {
        String appAccount = app.getAppAccount();
        if (appAccount == null && "".equals(appAccount)) {
            return true;
        }
        return BaseDAL.appDao.update(app);
    }

    @Override
    public boolean setDisable(String appAccount) {
        Application app = new Application();
        app.setAppAccount(appAccount);
        app.setIsDisable(Application.APP_DISABLE);
        return BaseDAL.appDao.update(app);
    }

    @Override
    public boolean setEnable(String appAccount) {
        Application app = new Application();
        app.setAppAccount(appAccount);
        app.setIsDisable(Application.APP_ENABLE);
        return BaseDAL.appDao.update(app);
    }

    @Override
    public List<Application> findAll() {
        return BaseDAL.appDao.findAll();
    }
}

   哈哈，使用层对象管理容器是不是很方便。通过一个引用就能获得所有的DAO支持。所以我在service层也构建了一个service层对象管理容器BaseBLL:

package com.pinche.statistic.service;

import java.lang.reflect.Field;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author JACKWANG
 * @since Dec 23, 2013
 */
@Service
public class BaseBLL {
    
    private static final Logger logger = LoggerFactory.getLogger(BaseBLL.class);
    
    @Autowired
    private AnalyzeService _analyzeService;
    public static AnalyzeService analyzeService;

    @Autowired
    private AppService _appService;
    public static AppService appService;

    @Autowired
    private MetaDataService _metaDataService;
    public static MetaDataService metaDataService;

    @PostConstruct
    public void init() {
        long start = System.currentTimeMillis();
        logger.debug("start init BaseBLL ...");
        try {

            Field[] fields = this.getClass().getDeclaredFields();

            for (int i = 0; i < fields.length; i++) {
                String fieldname = fields[i].getName();
                if (fieldname.startsWith("_")) {
                    String sfieldname = fieldname.substring(1);
                    Field sfield = this.getClass().getDeclaredField(sfieldname);
                    sfield.setAccessible(true);
                    sfield.set(this, fields[i].get(this));
                }
            }
            logger.debug("init BaseBLL OVER, consume = {}ms",
                    System.currentTimeMillis() - start);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

}

 好了下面应该是controller层的编写了，但是由于笔者以上的代码只是摘录了系统中的部分，而在controller中涉及到其他的内容，如果直接摘录可能和以上的代码衔接不上。所以这里就不进行了controller层的具体介绍了。本系统controller层使用的是SpringMVC，开发效率一级赞。

转载地址：http://wangjie2013.iteye.com/blog/1996159