spring注入方式(3)

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2016/1/16 10:02:30

1.Spring注入

Spring注入是指在启动Spring容器加载bean配置的时候，完成对变量的赋值行为
常用的两种注入方式
-设值注入调用类的set方法
-构造注入构造器参数注入的方法

在IOC容器读取XML文档时，初始化bean的时候，为bean的成员变量赋值

设值注入的方式：

XML：spring-injection.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:p="http://www.springframework.org/schema/p"         xmlns:aop="http://www.springframework.org/schema/aop"         xmlns:tx="http://www.springframework.org/schema/tx"         xmlns:mvc="http://www.springframework.org/schema/mvc"         xmlns:context="http://www.springframework.org/schema/context"         xsi:schemaLocation="http://www.springframework.org/schema/beans                            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd                             http://www.springframework.org/schema/context                            http://www.springframework.org/schema/context/spring-context-3.0.xsd                             http://www.springframework.org/schema/aop                            http://www.springframework.org/schema/aop/spring-aop-3.0.xsd                             http://www.springframework.org/schema/tx                            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd                             http://www.springframework.org/schema/mvc                            http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">         <bean id="injectionService" class="com.zjx.service.impl.InjectionServiceImpl">            <property name="injectionDao" ref="injectionDao"></property>        </bean>        <bean id="injectionDao" class="com.zjx.dao.impl.InjectionDaoImpl"></bean></beans>

DAO层

package com.zjx.dao.impl;import com.zjx.dao.InjectionDao;public class InjectionDaoImpl implements InjectionDao{    @Override    public void sava(String data) {        System.out.println("保存数据："+data);       }}

service层

package com.zjx.service.impl;import com.zjx.dao.InjectionDao;import com.zjx.service.InjectionService;public class InjectionServiceImpl implements InjectionService {    private InjectionDao injectionDao;    /**     * @param injectionDao 持久化接口     * 设值注入injectionDao     */    public void setInjectionDao(InjectionDao injectionDao) {        this.injectionDao = injectionDao;    }    @Override    public void save(String data) {        System.out.println("Service接受参数："+data);            data = data+":"+this.hashCode();        injectionDao.sava(data);    }}

测试：

package com.zjx.interfaces.test;import org.junit.Test;import org.junit.runner.RunWith;import org.junit.runners.BlockJUnit4ClassRunner;import com.zjx.service.InjectionService;@RunWith(BlockJUnit4ClassRunner.class)public class TestInjection extends UnitTestBase {    public TestInjection() {        super("classpath:spring-injection.xml");    }    @Test    public void test(){        InjectionService service = super.getBean("injectionService");        service.save("这是要保存的数据");    }}

构造器注入

XML：spring-injection.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:p="http://www.springframework.org/schema/p"         xmlns:aop="http://www.springframework.org/schema/aop"         xmlns:tx="http://www.springframework.org/schema/tx"         xmlns:mvc="http://www.springframework.org/schema/mvc"         xmlns:context="http://www.springframework.org/schema/context"         xsi:schemaLocation="http://www.springframework.org/schema/beans                            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd                             http://www.springframework.org/schema/context                            http://www.springframework.org/schema/context/spring-context-3.0.xsd                             http://www.springframework.org/schema/aop                            http://www.springframework.org/schema/aop/spring-aop-3.0.xsd                             http://www.springframework.org/schema/tx                            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd                             http://www.springframework.org/schema/mvc                            http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">         <bean id="injectionService" class="com.zjx.service.impl.InjectionServiceImpl">            <constructor-arg name="injectionDao" ref="injectionDao"></constructor-arg>        </bean>        <bean id="injectionDao" class="com.zjx.dao.impl.InjectionDaoImpl"></bean></beans>

DAO层

package com.zjx.dao.impl;import com.zjx.dao.InjectionDao;public class InjectionDaoImpl implements InjectionDao{    @Override    public void sava(String data) {        System.out.println("保存数据："+data);       }}

service层

package com.zjx.service.impl;import com.zjx.dao.InjectionDao;import com.zjx.service.InjectionService;public class InjectionServiceImpl implements InjectionService {    private InjectionDao injectionDao;    /**     * @param injectionDao 持久化接口     * 构造器注入     */    public InjectionServiceImpl(InjectionDao injectionDao) {        this.injectionDao = injectionDao;    }    @Override    public void save(String data) {        System.out.println("Service接受参数："+data);            data = data+":"+this.hashCode();        injectionDao.sava(data);    }}

测试：

package com.zjx.interfaces.test;import org.junit.Test;import org.junit.runner.RunWith;import org.junit.runners.BlockJUnit4ClassRunner;import com.zjx.service.InjectionService;@RunWith(BlockJUnit4ClassRunner.class)public class TestInjection extends UnitTestBase {    public TestInjection() {        super("classpath:spring-injection.xml");    }    @Test    public void test(){        InjectionService service = super.getBean("injectionService");        service.save("这是要保存的数据");    }}

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