JAVA 泛型BaseDao<T> BaseService <T>

model 层

package com.maomao.model;

import java.io.Serializable;

public class User implements Serializable{

/**
*
*/
private static final long serialVersionUID = 1L;
private Long id;
private String name;
private String age;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}

}

package com.maomao.model;

import java.io.Serializable;

public class Student implements Serializable{

/**
*
*/
private static final long serialVersionUID = 1L;
private Long id;
private String name;
private String age;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}

BaseDao

package com.maomao.dao;

import java.io.Serializable;
import java.util.List;

public interface BaseDao<T> {

void add(T o);

void del(Class<T> c, Serializable id);

List<T> findAll();

public T getById(Serializable id);

public void update(T o);

}

BaseDaoImpl

package com.maomao.dao.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

import com.maomao.dao.BaseDao;

public class BaseDaoImpl<T> implements BaseDao<T>{

@Override
public void add(T o) {
System.out.println(o.getClass().getName()+"：保存方法");

}

@Override
public void del(Class<T> c, Serializable id) {
System.out.println(c.getClass().getName()+"，id="+id+","+"：删除方法");

}

@Override
public List<T> findAll() {
Class<T> clazz = (Class<T>)((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];
System.out.println(clazz.getName()+"：查询所有方法");
return null;
}

@Override
public T getById(Serializable id) {
Class<T> clazz = (Class<T>)((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];
System.out.println(clazz.getName()+"，id="+id+","+"：根据主键ID查询方法");
return null;
}

@Override
public void update(T o) {
System.out.println(o.getClass().getName()+"：修改方法");

}

}

BaseService

package com.maomao.service;

import java.io.Serializable;
import java.util.List;

public interface BaseService<T> {

void add(T o);

void del(Serializable id);

List<T> findAll();

public T getById(Serializable id);

public void update(T o);

}

BaseServiceImpl

package com.maomao.service.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

import com.maomao.dao.BaseDao;
import com.maomao.dao.impl.BaseDaoImpl;
import com.maomao.service.BaseService;

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

private BaseDao<T> baseDao = new BaseDaoImpl();

@Override
public void add(T o) {
baseDao.add(o);
}

@Override
public void del(Serializable id) {
Class<T> clazz = (Class<T>)((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];
baseDao.del(clazz, id);

}

@Override
public List<T> findAll() {
baseDao.findAll();
return null;
}

@Override
public T getById(Serializable id) {
baseDao.getById(id);
return null;
}

@Override
public void update(T o) {
baseDao.update(o);

}

}

UserService

package com.maomao.service;

import com.maomao.model.User;

public interface UserService extends BaseService<User>{

}

UserServiceImpl

package com.maomao.service.impl;

import com.maomao.model.User;
import com.maomao.service.UserService;

public class UserServiceImpl  extends BaseServiceImpl<User> implements UserService {

}

StudentService

package com.maomao.service;

import com.maomao.model.Student;

public interface StudentService extends BaseService<Student>{

}

StudentServiceImpl

package com.maomao.service.impl;

import com.maomao.model.Student;
import com.maomao.service.StudentService;

public class StudentServiceImpl extends BaseServiceImpl<Student> implements
StudentService {
}

TestDemo

package com.maomao.test;

import org.junit.Test;

import com.maomao.model.Student;
import com.maomao.model.User;
import com.maomao.service.StudentService;
import com.maomao.service.UserService;
import com.maomao.service.impl.StudentServiceImpl;
import com.maomao.service.impl.UserServiceImpl;

public class TestDemo {

@Test
public void test1(){
UserService userService = new UserServiceImpl();

User u = new User();
userService.add(u);

Student student = new Student();

StudentService studentService = new StudentServiceImpl();
studentService.add(student);

}
}