Java 系列之spring學習--依賴註入（二）
阿新 • • 發佈：2018-02-25
ssp app odin throw 函數 ans 圖片 .com 配置
一、依賴註入的三種方式
接口註入，set註入，構造函數註入
二、構造函數註入
2.1、測試類
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、編輯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
">
<!-- 構造函數註入 -->
<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、測試
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註入
3.1測試類
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、測試
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());
}
}
四、實例
4.1、項目結構
4.2、數據層接口
4.2、數據層是實現類
4.4、業務層接口
4.5、業務層實現類
4.5、調用業務層
4.6、配置文件
4.7、結果
Java 系列之spring學習--依賴註入（二）