service和serviceImpl抽取

package cn.buaa.scm.service;

import cn.buaa.scm.entity.Page;

public interface BaseService<T> {

// 插入数据
public int insert(T entity) throws Exception;

// 修改单个对象
public int update(T entity) throws Exception;

// 删除单个对象
public int delete(T entity) throws Exception;

// 通过主键（数组）批量删除数据
public int deleteList(String[] pks) throws Exception;

// 查询单个对象
public T select(T entity) throws Exception;

// 通过关键字分页查询
public Page<T> selectPage(Page<T> page);

// 多条件分页查询
public Page<T> selectPageUseDyc(Page<T> page);

}

package cn.buaa.scm.service.impl;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;

import javax.annotation.PostConstruct;

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

import cn.buaa.scm.dao.AccountMapper;
import cn.buaa.scm.dao.BaseMapper;
import cn.buaa.scm.dao.SupplierMapper;
import cn.buaa.scm.entity.Page;
import cn.buaa.scm.service.BaseService;

public class BaseServiceImpl<T> implements BaseService<T> {

protected BaseMapper<T> baseMapper;

@Autowired
protected SupplierMapper supplierMapper;

@Autowired
protected AccountMapper accountMapper;

@PostConstruct
// 在构造方法后，初化前执行
private void initBaseMapper() throws Exception {
// 完成以下逻辑，需要对研发本身进行命名与使用规范
// this关键字指对象本身，这里指的是调用此方法的实现类（子类）
System.out.println("=======this :" + this);
System.out.println("=======父类基本信息：" + this.getClass().getSuperclass());
System.out.println("=======父类和泛型的信息：" + this.getClass().getGenericSuperclass());

ParameterizedType type = (ParameterizedType) this.getClass().getGenericSuperclass();
// 获取第一个参数的class
Class clazz = (Class) type.getActualTypeArguments()[0];
System.out.println("=======class:" + clazz);
// 转化为属性名（相关的Mapper子类的引用名）Supplier supplierMapper
String localField = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1)
+ "Mapper";
System.out.println("=======localField:" + localField);
// getDeclaredField:可以使用于包括私有、默认、受保护、公共字段，但不包括继承的字段
Field field = this.getClass().getSuperclass().getDeclaredField(localField);
System.out.println("=======field:" + field);
System.out.println("=======field对应的对象:" + field.get(this));
Field baseField = this.getClass().getSuperclass().getDeclaredField("baseMapper");

System.out.println("=======baseField:" + baseField);
System.out.println("=======baseField对应的对象:" + baseField.get(this));
// field.get(this)获取当前this的field字段的值。例如：Supplier对象中，baseMapper所指向的对象为其子类型SupplierMapper对象，子类型对象已被spring实例化于容器中
baseField.set(this, field.get(this));
System.out.println("========baseField对应的对象:" + baseMapper);

}

@Override
public int insert(T entity) throws Exception {
// TODO Auto-generated method stub
return baseMapper.insert(entity);
}

@Override
public int update(T entity) throws Exception {
// TODO Auto-generated method stub
return baseMapper.update(entity);
}

@Override
public int delete(T entity) throws Exception {
// TODO Auto-generated method stub
return baseMapper.delete(entity);
}

@Override
public int deleteList(String[] pks) throws Exception {
// TODO Auto-generated method stub
return baseMapper.deleteList(pks);
}

@Override
public T select(T entity) {
// TODO Auto-generated method stub
return baseMapper.select(entity);
}

@Override
public Page<T> selectPage(Page<T> page) {
page.setList(baseMapper.selectPageList(page));
page.setTotalRecord(baseMapper.selectPageCount(page));
return page;
}

@Override
public Page<T> selectPageUseDyc(Page<T> page) {
// TODO Auto-generated method stub
page.setList(baseMapper.selectPageListUseDyc(page));
page.setTotalRecord(baseMapper.selectPageCountUseDyc(page));
return page;
}
}