Spring--Ioc注入式编程

程序员文章站 2022-07-10 09:02:20

一，Set注入1.根据项目构建01-构建项目---导入spring jar包---创建 com.liuboss.dao comliuboss.service层com.liuboss.dao 层创建UserDao接口package com.liuboss.dao;public interface UserDao { public void save();}com.liuboss.dao.Impl层创建UserDaoImpl实现类实U......

一，Set注入

1.根据项目构建01-构建项目

Spring--Ioc注入式编程

---导入spring jar包

---创建 com.liuboss.dao comliuboss.service层

com.liuboss.dao 层创建UserDao接口

package com.liuboss.dao;

public interface UserDao {
    public void save();
}

com.liuboss.dao.Impl 层创建UserDaoImpl实现类

实UserDao的接口

package com.liuboss.dao.impl;

import com.liuboss.dao.UserDao;

public class UserDaoImpl implements UserDao {


    public void save() {
        System.out.println("User Dao running.......");

    }
}

创建 service层创建 UserService接口

package com.liuboss.service;

public interface UserService {
    public void save();
}

---包下创建impl包 UserServiceImpl类

实现UserService接口

package com.liuboss.service.Impl;

import com.liuboss.dao.UserDao;
import com.liuboss.dao.impl.UserDaoImpl;
import com.liuboss.service.UserService;

public class UserServiceImlp implements UserService {
    public void userServiceimpl(){
        System.out.println("类已经被加载......");
    }
    public void init(){
        System.out.println("初始化方法.....");
    }
    public void destory(){
        System.out.println("销毁方法.....");
    }

    private String str;

    public void setStr(String str) {
        this.str = str;
    }

    private int num;

    public void setNum(int num) {
        this.num = num;
    }

    //声明私有变量
    private UserDao userDao;

    //实现私有比变量的set方法
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }


    public void save() {

        System.out.println("User Service running..........."+num+" "+str);
        userDao.save();
    }


}

---在resources配置文件下进行资源配置

---创建applicationContext.xml

<?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: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 https://www.springframework.org/schema/context/spring-context.xsd">

   <!--scope="singleton"创建单例模式    创建多例模式 scope="prototype"-->
   <!--<bean id="userService3" scope="singleton" init-method="init" destroy-method="destory" class="com.liuboss.service.Impl.UserServiceImlp"/>-->

   <!--实现资源注入-->
   <bean id="userService"  class="com.liuboss.service.Impl.UserServiceImlp">
      <!--name为 注入的名称   ref为注入资源的资源id-->
      <property name="userDao" ref="userDao"/>
      <property name="num" value="666"/>
      <property name="str" value="永乐大帝"/>
   </bean>
   <!--想要实现资源注入 要进行资源的声明  保证资源受到spring资源控制-->
   <bean id="userDao" class="com.liuboss.dao.impl.UserDaoImpl"/>



</beans>

--service包下创建实现类

UserApp

实现其中的方法

package com.liuboss.service;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserApp {
    public static void main(String[] args) {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = (UserService) app.getBean("userService");
        userService.save();
    }
}

Spring--Ioc注入式编程

实现输出

重点讲解：

package com.liuboss.service.Impl;

import com.liuboss.dao.UserDao;
import com.liuboss.dao.impl.UserDaoImpl;
import com.liuboss.service.UserService;

public class UserServiceImlp implements UserService {
    public void userServiceimpl(){
        System.out.println("类已经被加载......");
    }
    public void init(){
        System.out.println("初始化方法.....");
    }
    public void destory(){
        System.out.println("销毁方法.....");
    }

    private String str;

    public void setStr(String str) {
        this.str = str;
    }

    private int num;

    public void setNum(int num) {
        this.num = num;
    }

    //声明私有变量
    private UserDao userDao;

    //实现私有比变量的set方法
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }


    public void save() {

        System.out.println("User Service running..........."+num+" "+str);
        userDao.save();
    }


}

实现值的注入只需要在service中声明私有变量实现set方法

之后再配置文件中进行注入。

//声明私有变量
    private UserDao userDao;

    //实现私有比变量的set方法
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

<!--实现资源注入-->
   <bean id="userService"  class="com.liuboss.service.Impl.UserServiceImlp">
      <!--name为 注入的名称   ref为注入资源的资源id-->
      <property name="userDao" ref="userDao"/>
      <property name="num" value="666"/>
      <property name="str" value="永乐大帝"/>
   </bean>
   <!--想要实现资源注入 要进行资源的声明  保证资源受到spring资源控制-->
   <bean id="userDao" class="com.liuboss.dao.impl.UserDaoImpl"/>

Spring--Ioc注入式编程

注意：

其中index为标记注入值的顺序，要将顺序进行标记才能好着正常识别

<bean id="userDao" class="com.liuboss.dao.Impl.UserDaoImpl"/>
    <bean id="userService"  class="com.liuboss.service.Impl.UserServiceImpl">
        <constructor-arg index="0" ref="userDao"/>
        <constructor-arg index="1" value="秦王嬴政"/>
    </bean>

重点：

spring报错方式解决办法，spring报错输出格式过长

看错误的方式要从最后开始看从后往前看每个代码块的第一行为报错方式

然后逐个解决

Spring--Ioc注入式编程

---数据类型注入方式

1.创建BookDao接口

package com.liuboss.book;

public interface BookDao {
    public void save();
}

创建实现类BookDaoImpl实现BookDao接口

package com.liuboss.book.Impl;

import com.liuboss.book.BookDao;
import lombok.Data;

import java.util.*;

@Data
public class BookDaoImpl implements BookDao {

    private ArrayList arrayList;

    public void setArrayList(ArrayList arrayList) {
        this.arrayList = arrayList;
    }

    private Properties properties;
    private int[] arr;
    private HashSet hashSet;
    private HashMap hashMap;


    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void setArr(int[] arr) {
        this.arr = arr;
    }

    public void setHashSet(HashSet hashSet) {
        this.hashSet = hashSet;
    }

    public void setHashMap(HashMap hashMap) {
        this.hashMap = hashMap;
    }

    public void save() {
        System.out.println("BOOK dao running");
        System.out.println("mybatis running"+arrayList);
        System.out.println("Properties running"+properties);
        for (int i = 0;i<arr.length;i++){
            System.out.println(arr[i]);
        }
        System.out.println("HashSet"+hashSet);
        System.out.println("hashMap"+hashMap);
        System.out.println("Book资源保存中....");
    }

}

在service层创建他的私有方法

package com.liuboss.service.Impl;

import com.liuboss.book.BookDao;
import com.liuboss.dao.UserDao;
import com.liuboss.service.UserService;


public class UserServiceImpl implements UserService {
    private UserDao userDao;

    private BookDao bookDao;

    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }

    private String username;


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

    public void setUsername(String username) {
        this.username = username;
    }


    public void save() {
        userDao.save();
        bookDao.save();
        System.out.println("Service---资源保存中................."+username);
    }
}

配置进行属性注入

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


    <!--<bean id="userService"  scope="singleton" init-method="init" destroy-method="destory" class="com.liuboss.service.Impl.UsreServiceImpl">
        <property name="userDao" ref="userDao"></property>
        <property name="username" value="永乐大帝"/>
    </bean>-->
    <bean id="userDao" class="com.liuboss.dao.Impl.UserDaoImpl"/>

    <bean id="userService"  class="com.liuboss.service.Impl.UserServiceImpl">
        <property name="userDao" ref="userDao"/>
        <property name="bookDao" ref="bookDao"/>
    </bean>
    <bean id="bookDao" class="com.liuboss.book.Impl.BookDaoImpl">

        <property name="properties">
            <props>
                <prop key="name">朱棣</prop>
                <prop key="value">永乐大帝</prop>
            </props>
        </property>
        <property name="arr">
            <list>
                <value>111</value>
                <value>222</value>
            </list>
        </property>
        <property name="hashMap">
            <map>
                <entry key="name" value="大秦始皇帝"/>
            </map>
        </property>
        <property name="arrayList">
            <list>
                <value>朱元璋</value>
                <value>朱棣</value>
            </list>
        </property>
        <property name="hashSet">
            <set>
                <value>朱元璋</value>
                <value>洪武大帝</value>
            </set>
        </property>
    </bean>
</beans>

本文地址：https://blog.csdn.net/qq_39696115/article/details/110491812

Spring--Ioc注入式编程

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Spring--Ioc注入式编程

重点讲解 ：

重点：

---数据类型注入方式

浅析Java8的函数式编程

PHP中全面阻止SQL注入式攻击分析小结_PHP教程

python学习（七）——函数、变量、递归、作用域、匿名函数、函数式编程

Android编程操作嵌入式关系型SQLite数据库实例详解

浅谈Spring5 响应式编程

Android编程之ICS式下拉菜单PopupWindow实现方法详解(附源码下载)

Android编程操作嵌入式关系型SQLite数据库实例详解

ASP.NET防范SQL注入式攻击的方法

浅谈Spring5 响应式编程

Android编程之ICS式下拉菜单PopupWindow实现方法详解(附源码下载)

重点讲解：