Spring集成MyBatis进行项目开发（三）

     Spring集成MyBatis进行项目开发（一）

     Spring集成MyBatis进行项目开发（二）

    上两章进行了相关环境的配置和测试，接下来是将继续这个样例系统的Dao层，service层和controller层。

    AppDao.java

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();
}

 AppDaoImpl.java

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;

    好了下面是service层定义的接口：

    AppService.java

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();
	
}

    AppServiceImpl.java : AppService的实现类：

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:

BaseBLL.java:

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。

List query(Teacher teach,Student stu,String year,String month){
    Map map = bean2Map(teach,stu)
    map.put("YEAR",year);
    map.put("MONTH",month);
    return mapper.query(map);
}

人家说你是“是沿袭了ibatis的写法”，这句话一点也没错啊！

更要命的是，你的反驳竟然进一步支持了他的观点！

因为你不知道Mybatis可以支持多个参数，包括相同类型的参数！相反，你继续沿用ibatis的方法：用Map来实现！

在Mybatis中用注解@Param就可以实现，具体用法可以上网学习下！

List query(Teacher teach,Student stu,String year,String month){
    Map map = bean2Map(teach,stu)
    map.put("YEAR",year);
    map.put("MONTH",month);
    return mapper.query(map);
}

没用过mybatis的注解，的确是刚知道用注解可以实现多参数的传递，谢谢提醒，学习了