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