JAVA_WEB项目之Service层抽取成BaseService和BaseServiceImpl

来源：互联网发布：数据分组分析法案例编辑：程序博客网时间：2024/04/30 14:58

在javaweb开发中使用到三大框架开发的时候会涉及到Dao层，Service层，Action层，接下来是贴出在Service层中抽取出公共业务逻辑模块的BaseService接口和BaseServiceImpl实现类。

package com.shop.service;import java.util.List;import com.shop.pojo.Category;public interface BaseService<T> {public void save(T t);public void update(T t);public void delete(int id);public T queryById(int id);public List<T> query();}

我们定义一个CategoryService接口，继承上面的接口：

package com.shop.service;import java.util.List;import com.shop.pojo.Category;public interface CategoryService extends BaseService<Category>{//定义属于CategoryService的业务方法 }

BaseServiceImpl：公共业务逻辑实现类

package com.shop.service.impl;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.List;import javax.annotation.Resource;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.context.annotation.Lazy;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.stereotype.Service;import com.shop.pojo.Category;import com.shop.service.BaseService;import com.shop.service.CategoryService;/** *  * @author Administrator *实现BaseService接口定义的方法，所有模块都有公共的方法 */@Service(value="baseService")//没有指定value的话，默认是第一个字母小写的类名,可以看做是xml中的bean的id@SuppressWarnings("unchecked")@Lazy(value=true)//延迟初始化，防止自身实例化时，调用构造BaseServiceImpl方法出现object类型转换异常public class BaseServiceImpl<T> implements BaseService<T>{@Resource(name="sessionFactory")protected SessionFactory sessionFactory;private Class clazz;//存储了具体操作的类,public BaseServiceImpl(){System.out.println(this);System.out.println(this.getClass());System.out.println(this.getClass().getSuperclass());System.out.println(this.getClass().getGenericSuperclass());Type type= this.getClass().getGenericSuperclass();ParameterizedType parameterizedType=(ParameterizedType) type;clazz= (Class) parameterizedType.getActualTypeArguments()[0];System.out.println(clazz);}public static void main(String[] args) {new ClassPathXmlApplicationContext("applicationContext-*.xml");}public void save(T t) {// TODO Auto-generated method stubSession session=sessionFactory.getCurrentSession();//得到当前线程的sessionFactorysession.save(t);}public void update(T t) {// TODO Auto-generated method stubSession session=sessionFactory.getCurrentSession();//得到当前线程的sessionFactorysession.update(t);}public void delete(int id) {// TODO Auto-generated method stubSession session=sessionFactory.getCurrentSession();//得到当前线程的sessionFactory//session.delete(session.get(Category.Class,id));//生成两天sql语句session.createQuery("delete From "+clazz.getSimpleName()+" c where c.id=:id").setInteger("id", id).executeUpdate();}public T queryById(int id) {Session session=sessionFactory.getCurrentSession();return (T) session.get(clazz, id);}public List<T> query() {// TODO Auto-generated method stubSession session=sessionFactory.getCurrentSession();return session.createQuery("From "+clazz.getSimpleName()).list();}}

下面写一个CategoryServiceImpl：

 package com.shop.service.impl;import java.util.List;import javax.annotation.Resource;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.stereotype.Service;import com.shop.pojo.Category;import com.shop.service.CategoryService;@Service(value="categoryService")//没有指定value的话，默认是第一个字母小写的类名,可以看做是xml中的bean的idpublic class CategoryServiceImpl extends BaseServiceImpl<Category> implements CategoryService {public CategoryServiceImpl(){super();}}

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