Spring-02-service层_spring service层-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_39696115/article/details/111379534

博客主要介绍Spring依赖注入，将dao层内容注入到service容器中，并给出实现代码。同时提到p命名空间注入方式，这是一种常用的注入方式，还可通过测试类进行测试。

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---spring依赖注入

将dao层的东西注入到---service容器中。

实现代码

pom

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.30.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
        </dependency>
    </dependencies>

com.liuboss.demo.UserDao

package com.liuboss.demo;

public interface UserDao {
    void save();
}

com.liuboss.demo.Impl.UserDaoImpl

package com.liuboss.demo.Impl;

import com.liuboss.demo.UserDao;

public class UserDaoImpl implements UserDao {
    public void save() {
        System.out.println("dao---save...running");
    }

    public UserDaoImpl() {
        System.out.println("dao---UserDaoImpl.....");
    }
}

com.liuboss.service.UserService

package com.liuboss.service;

public interface UserService {
    void save();

}

com.liuboss.service.Impl.UserServiceImpl

package com.liuboss.service.Impl;

import com.liuboss.demo.UserDao;
import com.liuboss.service.UserService;

public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public void save() {
        userDao.save();
        System.out.println("service...实现");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">



  <bean id="userDao" class="com.liuboss.demo.Impl.UserDaoImpl"></bean>
  <bean id="userService" class="com.liuboss.service.Impl.UserServiceImpl">
    <property name="userDao" ref="userDao"></property>
  </bean>




</beans>

测试类进行测试

@Test
    public void test2() {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = (UserService) app.getBean("userService");
        userService.save();

    }

---p命名空间注入方式

常用方式

<bean id="userDao" class="com.liuboss.demo.Impl.UserDaoImpl"></bean>
 <bean id="userService" class="com.liuboss.service.Impl.UserServiceImpl">
    <property name="userDao" ref="userDao"></property>
  </bean>

p空间方式

<bean id="userDao" class="com.liuboss.demo.Impl.UserDaoImpl"></bean>
  <bean id="userService" class="com.liuboss.service.Impl.UserServiceImpl" p:userDao-ref="userDao"/>