java spring ApplicationContext-属性初始化

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属性初始化

新建一个Java Project项目，添加Spring框架包：

1.在src文件中新建一个包zxl

2.添加两个类DrawingApp.java  Triangle.java

DrawingApp.java

package zxl;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class DrawingApp {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");Triangle triangle =(Triangle) context.getBean("triangle");triangle.draw();}}

Triangle.java

package zxl;public class Triangle {private String type;public String getType(){return type;}public void setType(String type){this.type=type;}public void draw(){System.out.println(getType()+" Triangle draw");}}

3.在src文件夹中创建一个xml文件 spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >        <property name="type" value="Equilateral" />    </bean></beans>

使用构造函数注入pt1

Triangle.java

package zxl;public class Triangle {private String type;public Triangle(String type){this.type=type;}public String getType(){return type;}/*public void setType(String type){this.type=type;}*/public void draw(){System.out.println(getType()+" Triangle draw");}}

spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >        <constructor-arg value="Equilateral" />    </bean></beans>

使用构造函数注入pt2

Triangle.java

package zxl;public class Triangle {private String type;private int height;public int getHeight(){return height;}public Triangle(String type,int height){this.type=type;this.height=height;}public String getType(){return type;}/*public void setType(String type){this.type=type;}*/public void draw(){System.out.println(getType()+" Triangle draw "+getHeight());}}

spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >        <constructor-arg value="Equilateral" />    <constructor-arg value="20" />    </bean></beans>

使用构造函数注入pt3

Triangle.java

package zxl;public class Triangle {private String type;private int height;public int getHeight(){return height;}public Triangle(String type){this.type=type;}public Triangle(int height){this.height=height;}public Triangle(String type,int height){this.type=type;this.height=height;}public String getType(){return type;}public void draw(){System.out.println(getType()+" Triangle draw "+getHeight());}}

spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >    <constructor-arg type="int" value="20" />    </bean></beans>

使用构造函数注入pt4

spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >    <constructor-arg type="java.lang.String" value="20" />    </bean></beans>

使用构造函数注入pt4

spring.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>    <bean id="triangle" class="zxl.Triangle" >    <constructor-arg index = "0" value="hello" />    <constructor-arg index = "1" value="20" />    </bean></beans>