案例48-crm练习利用spring管理service和dao层的对象

1 导包

2 将 Service 对象以及 Dao 对象配置到 spring 容器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
    <!--注册dao层对象到容器中  -->
    <bean name="userDao" class="www.test.dao.impl.UserDaoImpl"></bean>
    <bean name="linkManDao" class="www.test.dao.impl.LinkManDaoImpl"></bean>
    <bean name="customerDao" class="www.test.dao.impl.CustomerDaoImpl"></bean>
    <!--注册service层对象到容器中  -->
    <bean name="userService" class="www.test.service.impl.UserServiceImpl">
        <property name="ud" ref="userDao"></property>
    </bean>
    <bean name="linkManService" class="www.test.service.impl.LinkManServiceImpl">
        <property name="cd" ref="customerDao"></property>
        <property name="lmd" ref="linkManDao"></property>
    </bean>
    <bean name="customerService" class="www.test.service.impl.CustomerServiceImpl">
        <property name="customerDao" ref="customerDao"></property>
    </bean>
</beans>

注意对象中需要有对应的属性才能注入。

package www.test.service.impl;

import www.test.dao.CustomerDao;
import www.test.dao.LinkManDao;
import www.test.dao.impl.CustomerDaoImpl;
import www.test.dao.impl.LinkManDaoImpl;
import www.test.domain.Customer;
import www.test.domain.LinkMan;
import www.test.service.LinkManService;
import www.test.utils.HibernateUtils;

public class LinkManServiceImpl implements LinkManService {

    private CustomerDao cd;
    private LinkManDao lmd;
    public void save(LinkMan lm) {
        //打开事务
        HibernateUtils.getCurrentSession().beginTransaction();

        try {
            //1 根据客户id获得客户对象
            Long cust_id = lm.getCust_id();
            Customer c = cd.getById(cust_id);
            //2 将客户放入LinkMan中表达关系
            lm.setCustomer(c);
            //3 保存LinkMan
            lmd.save(lm);
        } catch (Exception e) {
            e.printStackTrace();
            //回滚事务
            HibernateUtils.getCurrentSession().getTransaction().rollback();
        }
        //提交事务
        HibernateUtils.getCurrentSession().getTransaction().commit();

    }
    public CustomerDao getCd() {
        return cd;
    }
    public void setCd(CustomerDao cd) {
        this.cd = cd;
    }
    public LinkManDao getLmd() {
        return lmd;
    }
    public void setLmd(LinkManDao lmd) {
        this.lmd = lmd;
    }

}

3 web.xml配置容器随项目的启动而启动

<!-- 可以让spring容器随项目的启动而创建,随项目的关闭而销毁 -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- 指定加载spring配置文件的位置 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>

4 在 Action 中获得容器中的对象

//=============================================================
//获得spring容器=>从Application域获得即可

//1 获得servletContext对象
ServletContext sc = ServletActionContext.getServletContext();
//2.从servletContext中获得ApplicationContext容器
WebApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(sc);

//3.从容器中获得CustomerService
CustomerService cs = (CustomerService) ac.getBean("customerService");

//============================================================