浅谈spring ioc的注入方式及注入不同的数据类型

/**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;	}}

  <!-- 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&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>

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();	}}

id:1--------------------------name:P&G--------------------------Bean:1|内部Bean|233--------------------------array:array01array02array03--------------------------list:list01list02list03--------------------------set:set01set02set03--------------------------map:mapKey01|mapValue01mapKey02|mapValue02--------------------------properties:propKey2|propValue2propKey1|propValue1------------------------------------------------------------------------------全部正确！！！

/** 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;	}}

  <!-- 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&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>

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();	}}

id:1----------------------------name:P&G----------------------------user:1|构造内部Bean|666----------------------------list:list01list02list03----------------------------全部正确！！！

/**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;	}}

  <!-- 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>

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();	}}

user:1|自动装配|233正确！！！

/**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;	}}

  <!-- 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>

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();	}}

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

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

@Repositorypublic 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;	}}

/**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;	}}

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();	}}

user:1|注解注入|233正确！！！

/**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");	}}

/** 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;	}}

  <!-- 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>

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();	}}

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

/**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");	}}

/**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;	}}

  <!-- 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>

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();	}}

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