一、依赖注入的三种方式
接口注入,set注入,构造函数注入
二、构造函数注入
2.1、测试类
package test; public class test01 { public String msg=null;
public test01(String msg)
{
System.out.println(msg); }
public void prints()
{ System.out.println("prints");
}
}
2.2、编辑applicationContext.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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
"> <!-- 构造函数注入 -->
<bean id="test01" class="test.test01">
<constructor-arg index="0">
<value>dirk</value>
</constructor-arg>
<constructor-arg index="1">
<value>dirk2</value>
</constructor-arg>
</bean> </beans>
2.3、测试
package test; public class test01 { public String msg=null;
public String msg1=null;
public test01(String msg,String msg1)
{
System.out.println(msg+msg1); }
public void prints()
{ System.out.println("prints");
}
}
package test; import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class aservlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
test02 test01=(test02)context.getBean("test02");
test01.getMsg();
} }
三、set注入
3.1测试类
package test; public class test02 {
public String msg; public String getMsg() {
return msg;
} public void setMsg(String msg) {
this.msg = msg;
}
}
3.2、配置文件修改
<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
"> <bean id="test02" class="test.test02">
<property name="msg">
<value>drik.wang</value>
</property>
</bean>
</beans>
package test; import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class aservlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
test02 test01=(test02)context.getBean("test02");
test01.getMsg();
} }
3.3、测试
package test; import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class aservlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
test02 test02=(test02)context.getBean("test02");
System.out.println(test02.getMsg());
} }