Spring框架的认识一

一、

1.dao

package com.zhidi.dao;

import com.zhidi.entity.Emp;

public class EmpDao {

    public Integer save(Emp emp)
    {
        if(emp!=null)
        {
            return 12;
        }
        return -2;
    }
}

package com.zhidi.dao;

import com.zhidi.entity.User;

public class UserDao {
    
    public Integer save(User user)
    {
        if(user!=null)
        {
            return 112;
        }
        return 0;
    }

}

2.entity

package com.zhidi.entity;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Collection1 {

    private List<String> list;
    private Set<Integer> set;
    private Map<String, Object> map;
    private String[] str;
    public List<String> getList() {
        return list;
    }
    public void setList(List<String> list) {
        this.list = list;
    }
    public Set<Integer> getSet() {
        return set;
    }
    public void setSet(Set<Integer> set) {
        this.set = set;
    }
    public Map<String, Object> getMap() {
        return map;
    }
    public void setMap(Map<String, Object> map) {
        this.map = map;
    }
    public String[] getStr() {
        return str;
    }
    public void setStr(String[] str) {
        this.str = str;
    }
    @Override
    public String toString() {
        return "Collection [list=" + list + ", set=" + set + ", map=" + map + ", str=" + Arrays.toString(str) + "]";
    }
    
    
}

package com.zhidi.entity;

public class Emp {

}

package com.zhidi.entity;

public class User {

}

3.test

package com.zhidi.test;

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

import com.zhidi.dao.UserDao;
import com.zhidi.entity.Collection1;
import com.zhidi.entity.User;
import com.zhidi.service.EmpService;
import com.zhidi.service.UserService;
import com.zhidi.util.ConnectionPool;

public class TestSpring {

    public static void main(String[] args) {
         //创建APPlicationContext对象
         ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
         //从Spring容器中获得UserDao
         UserDao userDao = applicationContext.getBean(UserDao.class);
         int a=userDao.save(new User());
         System.out.println(a);
         
         
         //从Spring容器中获得UserService
         UserService service=  applicationContext.getBean(UserService.class);
         boolean b=service.save(null);
         System.out.println(b);
         
         //从Spring容器中获得EmpService
         EmpService emp=applicationContext.getBean(EmpService.class);
         System.out.println(emp.save(null));
         
         
         test();
         test1();
    }
    
    
    
    public static void test()
    {
        ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        //注册时确保调用销毁的方法
        applicationContext.registerShutdownHook();
        applicationContext.getBean(ConnectionPool.class);
        System.out.println(applicationContext.getBean(ConnectionPool.class).toString());
    }
    
    public static void test1()
    {
        ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        
        applicationContext.getBean(Collection1.class);
        System.out.println(applicationContext.getBean(Collection1.class).toString());
    }
    
    
}

4.service

package com.zhidi.service;

import com.zhidi.dao.EmpDao;
import com.zhidi.entity.Emp;

public class EmpService {
 
    private EmpDao empDao;
    //Spring通过该方法将依赖对象empDao注入
    public void setEmpDao(EmpDao empDao) {
        this.empDao = empDao;
    }

    public boolean save(Emp emp)
    {
        if(empDao.save(emp)>0)
        {
            return true;
        }
        return false;
    }
}

package com.zhidi.service;

import com.zhidi.dao.UserDao;
import com.zhidi.entity.User;

public class UserService {
    private UserDao userDao;

    /*
     * 定义有参的构造方法
     */
    public UserService(UserDao userDao) {        
        this.userDao = userDao;
    }
    
    public boolean save(User user)
    {
        if(userDao.save(user)>0)
        {
            return true;
        }
        return false;
    }
}

5.util

package com.zhidi.util;



public class ConnectionPool {
    
    private String userName;
    private Integer age;
    private String sex;
    private String birthday;
    

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public void init()
    {
        System.out.println("初始化");
    }
    
    public void destroy()
    {
        System.out.println("销毁");
    }

    @Override
    public String toString() {
        return "ConnectionPool [userName=" + userName + ", age=" + age + ", sex=" + sex + ", birthday=" + birthday
                + "]";
    }
    
    
}

package com.zhidi.util;

public class SingleTon {
    
    private static SingleTon singleTon;
    private SingleTon(){
        
    }
    
    public static SingleTon getInstance()
    {
        if(singleTon==null)
        {
            singleTon=new SingleTon();
            
        }
        
        return singleTon;
    }

}

6.properties

#userName=zsdfghj
age=22
sex="u7537"
birthday="1993.4.7"
name=u4E8C

7.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 http://www.springframework.org/schema/context/spring-context.xsd  ">
    <!-- 读取外部配置 -->
    <context:property-placeholder location="info.properties" />
    <!-- 将自定义的UserDao交给Spring管理 -->
    <bean name="userDao" class="com.zhidi.dao.UserDao" />
    <!-- 通过有参方法注入依赖对象 -->
    <bean class="com.zhidi.service.UserService">
        <constructor-arg ref="userDao" />
    </bean>

    <!-- 将自定义的EmpDao交给Spring管理 scope默认为singleton,只实体化一次，而prototype每次都实例化 -->
    <bean name="empDao" class="com.zhidi.dao.EmpDao" scope="prototype" />

    <!--将empDao通过set注入给EmpService -->
    <bean class="com.zhidi.service.EmpService">
        <property name="empDao" ref="empDao" />
    </bean>

    <!--JavaBean生命周期的方法 -->
    <!-- <bean class="com.zhidi.util.ConnectionPool" init-method="init" destroy-method="destroy"/> -->

    <!-- 普通属性的装配 -->
    <bean class="com.zhidi.util.ConnectionPool" scope="singleton"
        init-method="init">
        <property name="userName" value="${name}" />
        <property name="age" value="${age}" />
        <property name="sex" value="${sex}" />
        <property name="birthday" value="${birthday}" />
    </bean>

    <!-- 集合属性的装配 -->
    <bean class="com.zhidi.entity.Collection1">
        <!-- list集合 -->
        <property name="list">
            <list>
                <value>二蛋</value>
                <value>三狗子</value>
            </list>
        </property>
        <!-- set集合 -->
        <property name="set">
            <set>
                <value>1</value>
                <value>2</value>
            </set>
        </property>
        <!--Map集合 -->
        <property name="map">
            <map>
                <entry key="name1" value="丹丹"></entry>
                <entry key="name2" value="蛋蛋"></entry>
            </map>
        </property>
        <!-- 数组 -->
        <property name="str">
            <array>
                <value>二狗蛋</value>
                <value>逗比猫</value>
            </array>
        </property>
    </bean>
</beans>

二、

1.dao

package com.zhidi.dao;

import javax.annotation.Resource;

import org.springframework.context.annotation.Primary;

import com.zhidi.entity.Emp;

public class EmpDao {
    /*
     * //@Resource 默认byName注入
     * 
     * @Resource //指定优先被装配的对象
     * 
     * @Primary
     */
    public Integer save(Emp emp) {
        if (emp != null) {
            return 1;
        }
        return -1;
    }
}

package com.zhidi.dao;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
//生命周期注解引入
public class LifeDao {

    @PostConstruct
    public void init()
    {
        System.out.println("初始化开启");
    }
    
    @PreDestroy
    public void destroy()
    {
        System.out.println("销毁");
    }
}

package com.zhidi.dao;

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;

import com.zhidi.entity.User;
@Component
@Service
@Repository
@Controller
public class UserDao {
    
    public Integer save(User user)
    {
        if(user!=null)
        {
            return 1;
        }
        return -1;
    }

}

2.entity

package com.zhidi.entity;

public class Emp {

}

package com.zhidi.entity;

public class User {

}

3.service

package com.zhidi.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

import com.zhidi.entity.Emp;

public class EmpService {
    // required=false 忽略对依赖对象的装配
    // @Autowired按byType注入
    @Autowired(required = false)
    // 指定要装配的Bean的id
    @Qualifier("emp")
    private Emp emp;

}

package com.zhidi.service;

import com.zhidi.dao.UserDao;
import com.zhidi.entity.User;

public class UserService {
    
    private UserDao userDao;
    //为依赖提供set注入方法
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
    
    public boolean save(User user)
    {
        if(userDao.save(user)>0)
        {
            return true;
        }
        return false;
    }
}

4.test

package com.zhidi.test;

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

import com.zhidi.dao.LifeDao;
import com.zhidi.entity.User;
import com.zhidi.service.EmpService;
import com.zhidi.service.UserService;

public class TestUser {
    //自动装配
    public static void main(String[] args) {
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        context.getBean(UserService.class);
        //System.out.println(context.getBean(UserService.class).save(new User()));
    
      test(context);
      test1(context);
    }
    
    //注解引入
    public static void test(ApplicationContext context)
    {
          System.out.println(context.getBean(EmpService.class).hashCode());
    }
    
    //生命周期注解引入
    public static void test1(ApplicationContext context)
    {
        context.getBean(LifeDao.class);
                
    }
}

5.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 http://www.springframework.org/schema/context/spring-context.xsd ">
    <!-- 开启注解配置 -->
    <context:annotation-config />
    <!-- 将UserDao注入Spring中 -->
    <!-- autowire-candidate="false" 将当前Bean排除依赖列表 -->
    <bean class="com.zhidi.dao.UserDao" autowire-candidate="false" />
    <!-- primary="true" 将当前Bean优先依赖列表 -->
    <bean class="com.zhidi.dao.UserDao" primary="true" />
    <bean class="com.zhidi.dao.UserDao" />
    <bean id="userDao" class="com.zhidi.dao.UserDao" />

    <!-- 将UserService注入Spring中 byType是按类型注入 byName要设置id id是set提供的 -->
    <bean class="com.zhidi.service.UserService" autowire="byName" />

    <!-- 将EmpDao和EmpService注入Spring中 -->
    <bean class="com.zhidi.dao.EmpDao" />
    <!-- 指定primary属性，首先的装配对象 -->
    <bean class="com.zhidi.service.EmpService" primary="true" />
    <!-- 生命周期注解引入 -->
    <bean class="com.zhidi.dao.LifeDao" />

    <!-- 指定去包下扫描Bean -->
    <context:component-scan base-package="com.zhidi" />
</beans>