spring 依赖注入 set和构造方法

基于spring4.x版本；3.x版本，不能构造方法注入；

参考：http://c.biancheng.net/view/4244.html

package com.ligy.service;

import com.ligy.dao.StudentDao;
import com.ligy.dao.TeacherDao;
import com.ligy.dao.TeacherDaoImpl;

public class TeacherServiceImpl implements ITeacherService {

    private TeacherDao teacherDao;

//    public void setTeacherDao(TeacherDao teacherDao) {
//        this.teacherDao = teacherDao;
//    }
//
//    public TeacherServiceImpl() {
//
//    }

    public TeacherServiceImpl(TeacherDao teacherDao) {
        this.teacherDao = teacherDao;
    }

    @Override
    public void add() {
        this.teacherDao.add();
        System.out.println("this is in StudentServiceImpl do1");
    }
}

<?xml version="1.0" encoding="UTF-8"?>

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">
    
    class="com.ligy.dao.StudentDaoImpl"/>
    class="com.ligy.dao.TeacherDaoImpl"/>
    class="com.ligy.service.StudentServiceImpl">
        
    

    class="com.ligy.service.TeacherServiceImpl">