Spring4.0MVC學習資料,注解自動掃描bean,自動注入bean(二)
Spring4.0的新特性我們在上一章已經介紹過了。包括它對jdk8的支持,Groovy Bean Definition DSL的支持,核心容器功能的改進,Web開發改進,測試框架改進等等。這張我們主要介紹spring4.0的自動掃描功能,以及對bean的過濾等特性進行學習。
好吧,廢話少說,我們來看看代碼吧。
package com.herman.ss.test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.herman.ss.action.TestAction; import com.herman.ss.filter.Filter1; import com.herman.ss.filter.Filter2; import com.herman.ss.filter.test.Filter3; import com.herman.ss.pojo.House; import com.herman.ss.pojo.Person; /** * @see spring4.0.0最新穩定版新特性,自動掃描bean,自動注入bean * @author Herman.Xiong * @date 2014年7月18日14:49:42 */ public class Test1 { /** * @see spring4.0自動掃描bean,自動注入bean */ public static void test0(){ //1.加載配置文件 ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml"); //2.獲取bean實例 Person person=(Person)ctx.getBean("person"); House house=(House)ctx.getBean("house"); //3.打印bean屬性 System.out.println(person); System.out.println(house); } /** * @see spring4.0簡單業務邏輯的注解 */ public static void test1(){ //1.加載配置文件 ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml"); //2.獲取bean實例 獲取bean TestAction testAction=(TestAction)ctx.getBean("testAction"); //3.打印bean屬性 System.out.println(testAction); //4.調用bean對象的方法 testAction.testAction(); //@Service 用於標注業務層組件; //@Repository 用於標注數據訪問層組件; //@Controller 用於標注控製層組件(如:Struts中的action) //@Component 表示泛型組件,當組件不好歸類的時候,我們可以使用這個組件進行注解。 } /** * @see spring4.0簡單注解的排除過濾器配置 */ public static void test2(){ //1.加載配置文件 ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml"); //2.獲取bean實例,隻能根據bean的id獲取bean Filter1 filter1=(Filter1)ctx.getBean("filter1"); Filter2 filter2=(Filter2)ctx.getBean("filter2"); //3.打印bean屬性 System.out.println(filter1); System.out.println(filter2); /** * 運行會報錯:Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined * 原因是:filter2被我們排除在外了,不會自動注入 * 因此會拋異常 */ } /** * @see spring4.0簡單注解的包含過濾器配置 */ public static void test3(){ //1.加載配置文件 ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml"); //2.獲取bean實例 Filter3 filter3=(Filter3)ctx.getBean("filter3"); Filter2 filter2=(Filter2)ctx.getBean("filter2"); Filter1 filter1=(Filter1)ctx.getBean("filter1"); //3.打印bean屬性 System.out.println(filter3); System.out.println(filter2); System.out.println(filter1); /** * 運行會報錯:Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined * 原因:filter2 被我們排除在外了 * 因此:我們回去filter2 這個bean對象的時候就會報錯。 * filter1 為什麼不報錯呢,因為我們設置了 com.herman.ss.filter包下麵的use-default-filters="true" 自動導入 * 因此:filter1 不會報錯 */ } public static void main(String[] args) { /** * 注解需要的jar包列舉: * spring-aop-4.0.6.RELEASE.jar * spring-beans-4.0.6.RELEASE.jar * spring-context-4.0.6.RELEASE.jar * spring-core-4.0.6.RELEASE.jar * spring-expression-4.0.6.RELEASE.jar * commons-lang-2.4.jar */ //test0(); //test1(); //test2(); test3(); } }配置文件源碼:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="https://www.springframework.org/schema/beans" xmlns:mvc="https://www.springframework.org/schema/mvc" xmlns:context="https://www.springframework.org/schema/context" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans-4.0.xsd https://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd https://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 打開Spring組件自動掃麵,並配置要掃描的基本包 --> <context:component-scan base-package="com.herman.ss.pojo"></context:component-scan> <context:component-scan base-package="com.herman.ss.action"></context:component-scan> <context:component-scan base-package="com.herman.ss.biz"></context:component-scan> <context:component-scan base-package="com.herman.ss.dao"></context:component-scan> <context:component-scan base-package="com.herman.ss.filter" use-default-filters="false"> <!-- 取消自動注入,配置隻注入com.herman.ss.filter.test下麵的所有類 --> <context:include-filter type="regex" expression="com.herman.ss.filter.test.*"/> </context:component-scan> <context:component-scan base-package="com.herman.ss.filter" use-default-filters="true"> <!-- 自動注入,但是Filter2除外 --> <context:exclude-filter type="regex" expression="com.herman.ss.filter.Filter2" /> </context:component-scan> <!-- 注:<context:component-scan>節點用於通知Spring容器掃描組件,base-package屬性用於指定將要被掃描的組件所在的包名 這裏將自動的配置掃描com.herman.ss.pojo下麵的bean --> </beans>實體類源碼:
package com.herman.ss.pojo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; /** * @see 實體類使用Component注解 * @author Herman.Xiong * @date 2014年7月24日17:11:59 */ @Component("person") public class Person { private String name; private int age; //這裏設置自動注入 @Autowired private House house; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public House getHouse() { return house; } public void setHouse(House house) { this.house = house; } public Person() { super(); } public Person(String name, int age) { super(); this.name = name; this.age = age; } public Person(String name, int age, House house) { super(); this.name = name; this.age = age; this.house = house; } @Override public String toString() { return "Person [age=" + age + ", house=" + house + ", name=" + name + "]"; } }House.java源碼:
package com.herman.ss.pojo; import org.springframework.stereotype.Component; @Component("house") public class House { private String name; private String address; private float price; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } public House() { super(); } public House(String name, String address, float price) { super(); this.name = name; this.address = address; this.price = price; } public String toString() { return "House [address=" + address + ", name=" + name + ", price=" + price + "]"; } }
package com.herman.ss.action; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import com.herman.ss.biz.TestBiz; /** * @see 模擬action * @author Herman.Xiong * @date 2014年7月24日17:17:16 * @since jdk 1.6,tomcat 6.0 */ @Controller("testAction") public class TestAction { //使用自動載入 @Autowired private TestBiz testBiz; //必須提供set方法 public void setTestBiz(TestBiz testBiz) { this.testBiz = testBiz; } public TestAction(){ System.out.println("模擬的action類"); } public void testAction(){ testBiz.testBiz(); } }
package com.herman.ss.biz; /** * @see 模擬biz層進行注解 * @author Herman.Xiong * @date 2014年7月24日17:20:25 */ public interface TestBiz { void testBiz(); }
package com.herman.ss.biz.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.herman.ss.biz.TestBiz; import com.herman.ss.dao.TestDao; @Service("testBiz") public class TestBizImpl implements TestBiz{ @Autowired private TestDao testDao; //必須提供set方法 public void setTestDao(TestDao testDao) { this.testDao = testDao; } public void testBiz() { System.out.println("模擬biz層"); testDao.testDao(); } }
package com.herman.ss.dao; /** * @see 模擬dao層進行注解 * @author Herman.Xiong * @date 2014年7月24日17:20:25 */ public interface TestDao { void testDao(); }
package com.herman.ss.dao.impl; import org.springframework.stereotype.Repository; import com.herman.ss.dao.TestDao; @Repository("testDao") public class TestDaoImpl implements TestDao{ public void testDao() { System.out.println("模擬dao層"); } }
package com.herman.ss.filter; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Controller; //Scope注解設置作用域 @Controller("filter1")@Scope("prototype") public class Filter1 { public Filter1(){ System.out.println("我是Filter1 ..."); System.out.println("Scope注解設置作用域"); } }
package com.herman.ss.filter.test; import org.springframework.stereotype.Controller; @Controller("filter3") public class Filter3 { public Filter3(){ System.out.println("我是filter3"); } }
package com.herman.ss.filter; import org.springframework.stereotype.Controller; @Controller("filter2") public class Filter2 { public Filter2(){ System.out.println("我是Filter2 ..."); } }

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最後更新:2017-04-03 05:39:30