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浅谈spring ioc的注入方式及注入不同的数据类型

时间:2021-03-12 13:47     来源/作者:等想出来再取

关于Spring-IoC的简单使用参考:

spring ioc的简单实例及bean的作用域属性解析

1、通过set方法注入不同数据类型

测试类代码(set方式注入的属性一定要加set方法)

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/**通过set方法注入示例*/
public class IoC_By_Set {
    /**注入Integer类型参数*/
    private Integer id;
    /**注入String类型参数*/
    private String name;
    /**注入实体Bean*/
    private User user;
    /**注入数组*/
    private Object[] array;
    /**注入List集合*/
    private List<Object> list;
    /**注入Set集合*/
    private Set<Object> set;
    /**注入Map键值对*/
    private Map<Object, Object> map;
    /**注入properties类型*/
    private Properties properties;
    /**注入空字符串*/
    private String emptyValue;
    /**注入null值*/
    private String nullValue = "";
    /**检测注入的属性是否全部正确*/
    public Boolean checkAttr() {
        if(id == null) {
            return false;
        } else {
            System.out.println("id:" + id);
        }
        System.out.println("--------------------------");
        if(name == null) {
            return false;
        } else {
            System.out.println("name:" + name);
        }
        System.out.println("--------------------------");
        if(user == null) {
            return false;
        } else {
            System.out.println("Bean:" + user.getId() + "|" +
                      user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("--------------------------");
        if(array == null) {
            return false;
        } else {
            System.out.println("array:");
            for (Object object : array) {
                System.out.println(object.toString());
            }
        }
        System.out.println("--------------------------");
        if(list == null) {
            return false;
        } else {
            System.out.println("list:");
            for (Object object : list) {
                System.out.println(object.toString());
            }
        }
        System.out.println("--------------------------");
        if(set == null) {
            return false;
        } else {
            System.out.println("set:");
            for (Object object : set) {
                System.out.println(object.toString());
            }
        }
        System.out.println("--------------------------");
        if(map == null) {
            return false;
        } else {
            Set<Entry<Object, Object>> set = map.entrySet();
            System.out.println("map:");
            for (Entry<Object, Object> entry : set) {
                System.out.println(entry.getKey() + "|" + entry.getValue());
            }
        }
        System.out.println("--------------------------");
        if(properties == null) {
            return false;
        } else {
            Set<Entry<Object, Object>> set = properties.entrySet();
            System.out.println("properties:");
            for (Entry<Object, Object> entry : set) {
                System.out.println(entry.getKey() + "|" + entry.getValue());
            }
        }
        System.out.println("--------------------------");
        if(!"".equals(emptyValue))
              return false;
        System.out.println("--------------------------");
        if(!(null == nullValue))
              return false;
        System.out.println("--------------------------");
        System.out.println("全部正确!!!");
        return true;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setUser(User user) {
        this.user = user;
    }
    public void setArray(Object[] array) {
        this.array = array;
    }
    public void setList(List<Object> list) {
        this.list = list;
    }
    public void setSet(Set<Object> set) {
        this.set = set;
    }
    public void setMap(Map<Object, Object> map) {
        this.map = map;
    }
    public void setProperties(Properties properties) {
        this.properties = properties;
    }
    public void setEmptyValue(String emptyValue) {
        this.emptyValue = emptyValue;
    }
    public void setNullValue(String nullValue) {
        this.nullValue = nullValue;
    }
}

applicationContext.xml配置

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<!-- set方式注入 -->
<bean id="ioC_By_Set" class="com.bc.ioc.demo01.IoC_By_Set">
  <!-- 注入id属性 -->
  <property name="id" value="1"/>
  <!-- 使用<![CDATA[]]>标记处理XML特 殊字符 -->
  <property name="name">
    <!-- 也可以使用P&amp;G -->
    <value><![CDATA[P&G]]></value>
  </property>
  <!-- 定义内部Bean注入 -->
  <property name="user">
    <bean class="com.bc.pojo.User">
      <property name="id" value="1"/>
      <property name="userName" value="内部Bean"/>
      <property name="passWord" value="233"/>
    </bean>
  </property>
  <!-- 注入数组类型 -->
  <property name="array">
    <array>
      <!-- 定义数组元素 -->
      <value>array01</value>
      <value>array02</value>
      <value>array03</value>
    </array>
  </property>
  <!-- 注入List类型 -->
  <property name="list">
    <list>
      <!-- 定义list中元素 -->
      <value>list01</value>
      <value>list02</value>
      <value>list03</value>
    </list>
  </property>
  <!-- 注入Set类型 -->
  <property name="set">
    <set>
      <!-- 定义set中元素 -->
      <value>set01</value>
      <value>set02</value>
      <value>set03</value>
    </set>
  </property>
  <!-- 注入Map类型 -->
  <property name="map">
    <map>
      <!-- 定义map中的键值对 -->
      <entry>
        <key>
          <value>mapKey01</value>
        </key>
        <value>mapValue01</value>
      </entry>
      <entry>
        <key>
          <value>mapKey02</value>
        </key>
        <value>mapValue02</value>
      </entry>
    </map>
  </property>
  <!-- 注入properties类型 -->
  <property name="properties">
    <props>
      <!-- 定义properties中的键值对 -->
      <prop key="propKey1">propValue1</prop>
      <prop key="propKey2">propValue2</prop>
    </props>
  </property>
  <!-- 注入空字符串 -->
  <property name="emptyValue">
    <value></value>
  </property>
  <!-- 注入null值 -->
  <property name="nullValue">
    <null/>
  </property>
</bean>

测试代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void SetTest() {
        IoC_By_Set ioc = (IoC_By_Set) ctx.getBean("ioC_By_Set");
        ioc.checkAttr();
    }
}

控制台结果:

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id:1
--------------------------
name:P&G
--------------------------
Bean:1|内部Bean|233
--------------------------
array:
array01
array02
array03
--------------------------
list:
list01
list02
list03
--------------------------
set:
set01
set02
set03
--------------------------
map:
mapKey01|mapValue01
mapKey02|mapValue02
--------------------------
properties:
propKey2|propValue2
propKey1|propValue1
--------------------------
--------------------------
--------------------------
全部正确!!!

2、通过构造方法注入各种类型属性

注意:使用JDK1.8版本请将spring相关jar包升级到4.x版本以上,否则不兼容构造方法注入

测试类代码

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/** 通过构造方法注入示例 */
public class IoC_By_Constructor {
    private Integer id;
    private String name;
    private User user;
    private List<Object> list;
    public IoC_By_Constructor() {
    }
    public IoC_By_Constructor(Integer id, String name, User user,
          List<Object> list) {
        this.id = id;
        this.name = name;
        this.user = user;
        this.list = list;
    }
    /**检查是否注入成功*/
    public Boolean checkAttr() {
        if(id == null) {
            return false;
        } else {
            System.out.println("id:" + id);
        }
        System.out.println("----------------------------");
        if(name == null) {
            return false;
        } else {
            System.out.println("name:" + name);
        }
        System.out.println("----------------------------");
        if(user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|" +
                      user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("----------------------------");
        if(list == null) {
            return false;
        } else {
            System.out.println("list:");
            for (Object object : list) {
                System.out.println(object.toString());
            }
        }
        System.out.println("----------------------------");
        System.out.println("全部正确!!!");
        return true;
    }
}

applicationContext.xml配置

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<!-- 构造方法注入 演示几种类型-->
<bean id="ioC_By_Constructor" class="com.bc.ioc.demo02.IoC_By_Constructor">
  <!-- 注入Integer属性,可以选择使用index指定参数位置,也可以选择使用type指定参数类型 -->
  <constructor-arg index="0" value="1" type="java.lang.Integer"/>
  <!-- 注入字符串 -->
  <constructor-arg value="P&amp;G"/>
  <!-- 注入对象 -->
  <constructor-arg>
    <!-- 内建对象 -->
    <bean class="com.bc.pojo.User">
      <constructor-arg value="1"/>
      <constructor-arg value="构造内部Bean"/>
      <constructor-arg value="666"/>
    </bean>
  </constructor-arg>
  <!-- 注入集合 -->
  <constructor-arg>
    <list>
      <value>list01</value>
      <value>list02</value>
      <value>list03</value>
    </list>
  </constructor-arg>
</bean>

测试代码:

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void constructorTest() {
        IoC_By_Constructor ioc = (IoC_By_Constructor) ctx.getBean("ioC_By_Constructor");
        ioc.checkAttr();
    }
}

控制台结果:

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id:1
----------------------------
name:P&G
----------------------------
user:1|构造内部Bean|666
----------------------------
list:
list01
list02
list03
----------------------------
全部正确!!!

3、自动注入(自动装配)

自动装配虽然能节省一些代码但是不推荐使用

测试类代码:

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/**自动装配注入*/
public class IoC_By_Auto {
    private User user;
    /**检查是否注入成功*/
    public Boolean checkAttr() {
        if(user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|" +
                      user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("正确!!!");
        return true;
    }
    /**自动装配的属性需要设置set方法*/
    public void setUser(User user) {
        this.user = user;
    }
}

applicationContext.xml配置

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<!-- 被自动装配获取的bean -->
<bean id="user" class="com.bc.pojo.User">
  <property name="id" value="1"/>
  <property name="userName" value="自动装配"/>
  <property name="passWord" value="233"/>
</bean>
<!-- 自动装配的bean
   autowire:byName 根据类的属性名查找与之命名相同的id的bean进行装配
       byType 根据类的属性类型查找唯一一个匹配类型的bean,如果有多个bean匹配则抛出异常
       constructor 根据类的构造方法参数类型匹配对应的bean
       no 默认,表示不使用自动装配
       default:由上级标签<beans>的default-autowire属性确定 -->
<bean id="ioC_By_Auto" class="com.bc.ioc.demo03.IoC_By_Auto" autowire="byName"></bean>

测试代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void AutoTest() {
        IoC_By_Auto ioc = (IoC_By_Auto) ctx.getBean("ioC_By_Auto");
        ioc.checkAttr();
    }
}

控制台结果

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user:1|自动装配|233
正确!!!

以上使用的是byName模式,其他模式配置代码已经注明,不做测试。

4、使用P命名空间注入属性

测试类代码

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/**使用P命名空间注入*/
public class IoC_By_P {
    private Integer id;
    private String name;
    private User user;
    /**检查是否注入成功*/
    public Boolean checkAttr() {
        if(id == null) {
            return false;
        } else {
            System.out.println("id:" + id);
        }
        System.out.println("----------------------------");
        if(name == null) {
            return false;
        } else {
            System.out.println("name:" + name);
        }
        System.out.println("----------------------------");
        if(user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|" +
                      user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("----------------------------");
        System.out.println("全部正确!!!");
        return true;
    }
    //使用P命名空间注入属性需要设置set方法
    public void setId(Integer id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setUser(User user) {
        this.user = user;
    }
}

applicationContext.xml配置

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<!-- 使用P命名空间注入各种类型属性 -->
<bean id="user2" class="com.bc.pojo.User">
  <property name="id" value="1"/>
  <property name="userName" value="P"/>
  <property name="passWord" value="233"/>
</bean>
<bean id="ioC_By_P" class="com.bc.ioc.demo04.IoC_By_P" p:id="1"
  p:name="命名空间" p:user-ref="user2"></bean>

测试代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void PTest() {
        IoC_By_P ioc = (IoC_By_P) ctx.getBean("ioC_By_P");
        ioc.checkAttr();
    }
}

控制台结果

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id:1
----------------------------
name:命名空间
----------------------------
user:1|P|233
----------------------------
全部正确!!!

5、使用注解方式注入

Spring在3.0以后,提供了基于Annotation(注解)的注入。

1.@Autowired-对成员变量、方法和构造函数进行标注,来完成自动装配的工作,不推荐使用

2.@Qualifier-配合@Autowired来解决装配多个同类型的bean

3.@Resource-JSR-250标准注解,作用相当于@Autowired,只不过@Autowired按byType自动注入,而@Resource默认按byName自动注入

4.@PostConstruct-在方法上加上注解@PostConstruct,这个方法就会在Bean初始化之后被Spring容器执行

5.@PreDestroy-在方法上加上注解@PreDestroy,这个方法就会在Bean初始化之后被Spring容器执行

6.@Component-只需要在对应的类上加上一个@Component注解,就将该类定义为一个Bean,不推荐使用,推荐使用更加细化的三种:@Repository、@Service、@Controller

@Repository存储层Bean

@Service业务层Bean

@Controller展示层Bean

7.@Scope-定义Bean的作用范围

首先配置applicationContext.xml开启注解

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<!-- 扫描包中注解标注的类 -->
<context:component-scan base-package="com.bc.ioc.demo05"/>

实体Bean加注解

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@Repository
public class User {
    private Integer id = 1;
    private String userName = "注解注入";
    private String passWord = "233";
    public User() {
        super();
    }
    public User(Integer id, String userName, String passWord) {
        super();
        this.id = id;
        this.userName = userName;
        this.passWord = passWord;
    }
    public Integer getId() {
        return id;
    }
    public String getUserName() {
        return userName;
    }
    public String getPassWord() {
        return passWord;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
}

测试类代码加注解

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/**使用注解注入属性*/
@Service("ioC_By_Annotation")
public class IoC_By_Annotation {
    @Resource
      private User user;
    public void setUser(User user) {
        this.user = user;
    }
    /**检查是否注入成功*/
    public Boolean checkAttr() {
        if(user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|" +
                      user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("正确!!!");
        return true;
    }
}

测试代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void annotationTest() {
        IoC_By_Annotation ioc = (IoC_By_Annotation) ctx.getBean("ioC_By_Annotation");
        ioc.checkAttr();
    }
}

控制台输出

经测试使用注解注入如果applicationContext.xml配置有其他注入方式会报错,也会导致其他注入方式异常。

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user:1|注解注入|233
正确!!!

6、通过配置静态工厂方法Bean注入

静态工厂代码

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/**静态工厂*/
public class StaticFactory {
    public static Integer getId() {
        return 1;
    }
    public static String getName() {
        return "静态工厂";
    }
    public static User getUser() {
        return new User(1, "工厂User", "666");
    }
}

测试类代码

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/** 通过静态工厂方式注入 */
public class IoC_By_StaticFactory {
    private Integer id;
    private String name;
    private User user;
    /** 检查是否注入成功 */
    public Boolean checkAttr() {
        if (id == null) {
            return false;
        } else {
            System.out.println("id:" + id);
        }
        System.out.println("----------------------------");
        if (name == null) {
            return false;
        } else {
            System.out.println("name:" + name);
        }
        System.out.println("----------------------------");
        if (user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|"
                      + user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("----------------------------");
        System.out.println("全部正确!!!");
        return true;
    }
    /**需要为需要注入的属性设置set方法*/
    public void setId(Integer id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setUser(User user) {
        this.user = user;
    }
}

applicationContext.xml配置

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<!-- 配置静态工厂方法Bean 其实就是将工厂方法返回的数值配置成Bean -->
<bean id="factory_id" class="com.bc.ioc.demo06.StaticFactory" factory-method="getId"/>
<bean id="factory_name" class="com.bc.ioc.demo06.StaticFactory" factory-method="getName"/>
<bean id="factory_user" class="com.bc.ioc.demo06.StaticFactory" factory-method="getUser"/>
<!-- 注入对应的静态工厂方法Bean -->
<bean id="ioC_By_StaticFactory" class="com.bc.ioc.demo06.IoC_By_StaticFactory">
  <property name="id" ref="factory_id"/>
  <property name="name" ref="factory_name"/>
  <property name="user" ref="factory_user"/>
</bean>

测试代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void staticFactoryTest() {
        IoC_By_StaticFactory ioc = (IoC_By_StaticFactory) ctx.getBean("ioC_By_StaticFactory");
        ioc.checkAttr();
    }
}

控制台输出结果

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id:1
----------------------------
name:静态工厂
----------------------------
user:1|工厂User|666
----------------------------
全部正确!!!

7、通过实例工厂方法注入

与静态工厂区别在于实例工厂不是静态的,需要先new 一个实例工厂对象,才可以配置其方法,而new 的这个对象也由spring来管理

工厂代码

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/**实例工厂*/
public class Factory {
    public Integer getId() {
        return 1;
    }
    public String getName() {
        return "实例工厂";
    }
    public User getUser() {
        return new User(1, "实例工厂User", "233");
    }
}

测试类代码

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/**实例工厂注入*/
public class IoC_By_Factory {
    private Integer id;
    private String name;
    private User user;
    /** 检查是否注入成功 */
    public Boolean checkAttr() {
        if (id == null) {
            return false;
        } else {
            System.out.println("id:" + id);
        }
        System.out.println("----------------------------");
        if (name == null) {
            return false;
        } else {
            System.out.println("name:" + name);
        }
        System.out.println("----------------------------");
        if (user == null) {
            return false;
        } else {
            System.out.println("user:" + user.getId() + "|"
                      + user.getUserName() + "|" + user.getPassWord());
        }
        System.out.println("----------------------------");
        System.out.println("全部正确!!!");
        return true;
    }
    /**需要为需要注入的属性设置set方法*/
    public void setId(Integer id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setUser(User user) {
        this.user = user;
    }
}

applicationContext.xml配置

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<!-- 配置实例工厂Bean -->
<bean id="factory" class="com.bc.ioc.demo07.Factory"/>
<!-- 配置实例工厂方法Bean -->
<bean id="f_id" factory-bean="factory" factory-method="getId"/>
<bean id="f_name" factory-bean="factory" factory-method="getName"/>
<bean id="f_user" factory-bean="factory" factory-method="getUser"/>
<!-- 注入对应的实例工厂方法Bean -->
<bean id="ioC_By_Factory" class="com.bc.ioc.demo07.IoC_By_Factory">
  <property name="id" ref="f_id"/>
  <property name="name" ref="f_name"/>
  <property name="user" ref="f_user"/>
</bean>

测试类代码

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public class IoC_Test {
    private ApplicationContext ctx;
    @Before
      public void load() {
        //读取applicationContext.xml配置文件
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    }
    @Test
      public void factoryTest() {
        IoC_By_Factory ioc = (IoC_By_Factory) ctx.getBean("ioC_By_Factory");
        ioc.checkAttr();
    }
}

控制台输出

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id:1
----------------------------
name:实例工厂
----------------------------
user:1|实例工厂User|233
----------------------------
全部正确!!!

总结

以上就是本文关于浅谈spring ioc的注入方式及注入不同的数据类型的全部内容,希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题,如有不足之处,欢迎留言指出。感谢朋友们对本站的支持!

原文链接:http://blog.csdn.net/qq_32588349/article/details/51554379

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