{"id":1506,"date":"2016-08-31T13:04:44","date_gmt":"2016-08-31T13:04:44","guid":{"rendered":"http:\/\/codethataint.com\/blog\/?p=1506"},"modified":"2016-08-31T16:22:32","modified_gmt":"2016-08-31T16:22:32","slug":"1506","status":"publish","type":"post","link":"https:\/\/codethataint.com\/blog\/1506\/","title":{"rendered":"Working with Bean"},"content":{"rendered":"

spring.xml<\/strong><\/p>\n

\r\n<?xml version="1.0" encoding="UTF-8"?>\r\n<!DOCTYPE beans PUBLIC "-\/\/SPRING\/\/DTD BEAN\/\/EN" "http:\/\/www.springframework.org\/dtd\/spring-beans.dtd">\r\n<beans>\r\n    <bean id="triangleId" class="com.mugil.shapes.Triangle"\/>\r\n<\/beans>\r\n<\/pre>\n
Triangle.java<\/strong><\/p>\n
\r\npackage com.mugil.shapes;\r\n\r\npublic class Triangle {\r\n\tprivate String type;\r\n\t\r\n\tpublic String getType() {\r\n\t\treturn type;\r\n\t}\r\n\r\n\tpublic void setType(String type) {\r\n\t\tthis.type = type;\r\n\t}\r\n\r\n\tpublic void drawShape()\r\n\t{\r\n\t\tSystem.out.println("Shape of Triangle");\r\n\t}\r\n}\r\n\r\n<\/pre>\n
Reading value of Bean by Application Context and Bean Factory<\/strong><\/p>\n
\r\npublic class Shape \r\n{\r\n   public static void main(String[] args) \r\n   {\r\n\tApplicationContext objContext = new ClassPathXmlApplicationContext("spring1.xml");\r\n\tTriangle objTriangle1 =  (Triangle)objContext.getBean("triangleId");\r\n\tobjTriangle1.drawShape();\r\n\t\t\r\n\t\t\r\n\tBeanFactory  objBeanFactory = new XmlBeanFactory(new FileSystemResource("spring.xml"));\r\n\tTriangle objTriangle2 =  (Triangle)objBeanFactory.getBean("triangleId");\r\n\tobjTriangle2.drawShape();\r\n    }\r\n}\r\n<\/pre>\n
Constructor Initialization<\/strong>
\nTriangle.java<\/strong><\/p>\n
\r\npackage com.mugil.shapes;\r\n\r\npublic class Triangle \r\n{\r\n\tprivate String type;\r\n\r\n        public Triangle(String ptype)\r\n\t{\r\n\t\tthis.type = ptype;\r\n\t}\r\n\t\r\n        public void drawShape()\r\n\t{\r\n\t\tSystem.out.println("Shape of Triangle");\r\n\t}\r\n}\r\n<\/pre>\n
The Index Specifies which variable in the Bean is Initialized<\/p>\n
\r\n<beans>\r\n\t<bean id="triangleId" class="com.mugil.shapes.Triangle">\r\n\t\t<constructor-arg index="0" value="Isolseles"\/>\r\n\t<\/bean>\r\n<\/beans>\r\n<\/pre>\n
Real World Dependency Injection<\/strong>
\nspring.xml<\/strong><\/p>\n
 \r\n<beans>\r\n\t<bean id="triangleId" class="com.mugil.shapes.Triangle">\r\n\t\t<property name="pointA" ref="point1"\/>\r\n\t\t<property name="pointB" ref="point2"\/>\r\n\t\t<property name="pointC" ref="point3"\/>\r\n\t<\/bean>\r\n\t\r\n\t<bean id="point1" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="-20"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n\t<bean id="point2" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="0"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n\t<bean id="point3" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="20"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n\t\r\n<\/beans>\r\n<\/pre>\n
Triangle.java<\/strong><\/p>\n
 \r\npublic class Triangle {\r\n\tprivate String type;\r\n\tprivate Point pointA;\r\n\tprivate Point pointB;\r\n\tprivate Point pointC;\r\n\t\r\n\tpublic String getType() {\r\n\t\treturn type;\r\n\t}\r\n\r\n\tpublic void setType(String type) {\r\n\t\tthis.type = type;\r\n\t}\r\n\r\n\tpublic void drawShape()\r\n\t{\r\n\t\tSystem.out.println("Shape of Triangle");\r\n\t}\r\n\r\n\tpublic Point getPointA() {\r\n\t\treturn pointA;\r\n\t}\r\n\r\n\tpublic void setPointA(Point pointA) {\r\n\t\tthis.pointA = pointA;\r\n\t}\r\n\r\n\tpublic Point getPointB() {\r\n\t\treturn pointB;\r\n\t}\r\n\r\n\tpublic void setPointB(Point pointB) {\r\n\t\tthis.pointB = pointB;\r\n\t}\r\n\r\n\tpublic Point getPointC() {\r\n\t\treturn pointC;\r\n\t}\r\n\r\n\tpublic void setPointC(Point pointC) {\r\n\t\tthis.pointC = pointC;\r\n\t}\r\n}\r\n\r\n<\/pre>\n
Point.java<\/strong><\/p>\n
 \r\npackage com.mugil.shapes;\r\n\r\npublic class Point {\r\n\tprivate int x;\r\n\tprivate int y;\r\n\t\r\n\tpublic int getX() {\r\n\t\treturn x;\r\n\t}\r\n\tpublic void setX(int x) {\r\n\t\tthis.x = x;\r\n\t}\r\n\tpublic int getY() {\r\n\t\treturn y;\r\n\t}\r\n\tpublic void setY(int y) {\r\n\t\tthis.y = y;\r\n\t}\r\n}\r\n<\/pre>\n
Shape.java<\/strong><\/p>\n
 \r\nimport org.springframework.beans.factory.BeanFactory;\r\nimport org.springframework.beans.factory.xml.XmlBeanFactory;\r\nimport org.springframework.core.io.FileSystemResource;\r\n\r\npublic class Shape \r\n{\r\n    public static void main(String[] args) \r\n    {\t\t\r\n\tBeanFactory  objBeanFactory = new XmlBeanFactory(new FileSystemResource("spring.xml"));\r\n\tTriangle objTriangle2 =  (Triangle)objBeanFactory.getBean("triangleId");\r\n\t\t\r\n\tSystem.out.println("The Refereeed Points are = ");\r\n\tSystem.out.println("Point A :" + objTriangle2.getPointA().getX() +" " + objTriangle2.getPointA().getY());\r\n\tSystem.out.println("Point B :" + objTriangle2.getPointB().getX() +" " + objTriangle2.getPointB().getY());\r\n\tSystem.out.println("Point C :" + objTriangle2.getPointC().getX() +" " + objTriangle2.getPointC().getY());\t\t\r\n\t}\r\n}\r\n<\/pre>\n
Incase the value of the bean wont be referred else where you can define the bean property simple as below<\/p>\n
\r\n<beans>\r\n\t<bean id="triangleId" class="com.mugil.shapes.Triangle">\r\n\t\t<property name="pointA">\r\n\t\t\t<bean id="point1" class="com.mugil.shapes.Point">\r\n\t\t\t\t<property name="x" value="-20"\/>\r\n\t\t\t\t<property name="y" value="0"\/>\r\n\t\t\t<\/bean>\t\t\t\r\n\t\t<\/property>\r\n\t\t<property name="pointB" ref="point2"\/>\r\n\t\t<property name="pointC" ref="point3"\/>\r\n\t<\/bean>\r\n<\/pre>\n
instead of <\/p>\n
\r\n<beans>\r\n\t<bean id="triangleId" class="com.mugil.shapes.Triangle">\r\n\t\t<property name="pointA" ref="point1"\/>\r\n\t\t<property name="pointB" ref="point2"\/>\r\n\t\t<property name="pointC" ref="point3"\/>\r\n\t<\/bean>\r\n\t\r\n\t<bean id="point1" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="-20"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n.\r\n.\r\n.\r\n\r\n<\/pre>\n
Using Alias<\/strong><\/p>\n
\r\n<bean id="triangleId" class="com.mugil.shapes.Triangle" name="triangleName">\r\n.\r\n.\r\n.\r\n<\/bean>\r\n<alias name="triangleId" alias="triangle-alias"\/>\r\n<\/pre>\n
In Java we can refer either by name or by alias as below
\nUsing Alias<\/strong><\/p>\n
\r\n.\r\n.\r\nTriangle objTriangle2 =  (Triangle)objBeanFactory.getBean("triangleName");\r\n(or)\r\nTriangle objTriangle2 =  (Triangle)objBeanFactory.getBean("triangle-alias");\r\n.\r\n.\r\n<\/pre>\n
Using List<\/strong>
\nTriangle.java<\/strong><\/p>\n
\r\npublic class Triangle \r\n{\r\n    private List<Point> points;\t\r\n\t\r\n    public List<Point> getPoints() \r\n    {\r\n\treturn points;\r\n    }\r\n\r\n    public void setPoints(List<Point> points) \r\n    {\r\n \tthis.points = points;\r\n    }\t\t\t\r\n}\r\n<\/pre>\n
spring.xml<\/strong><\/p>\n
\r\n<beans>\r\n\t<bean id="triangleId" class="com.mugil.shapes.Triangle" name="triangleName">\r\n\t\t<property name="points">\r\n\t\t\t<list>\r\n\t\t\t\t<ref bean="point1"\/>\r\n\t\t\t\t<ref bean="point2"\/>\r\n\t\t\t\t<ref bean="point3"\/>\r\n\t\t\t<\/list>\t\t\r\n\t\t<\/property>\t\t\r\n\t<\/bean>\r\n\t<bean id="point1" class="com.mugil.shapes.Point">\r\n\t\t\t<property name="x" value="-20"\/>\r\n\t\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n\t<bean id="point2" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="0"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n\t<bean id="point3" class="com.mugil.shapes.Point">\r\n\t\t<property name="x" value="20"\/>\r\n\t\t<property name="y" value="0"\/>\r\n\t<\/bean>\r\n<\/beans>\r\n<\/pre>\n
Shape.java<\/strong><\/p>\n
\r\nList<Point> arrPoints = objTriangle2.getPoints();\r\n\t\t\r\n for (Point objPoint : arrPoints) \r\n {\r\n   System.out.println("Point :" + objPoint.getX() +" " + objPoint.getY());\r\n }\r\n<\/pre>\n
Autowiring<\/strong>
\nAutowiring can be done based on name as below, byType and byConstructor.<\/p>\n
\r\n<bean id="triangleId" class="com.mugil.shapes.Triangle" name="triangleName" autowire="byName">\t\r\n<\/bean>\r\n<bean id="pointA" class="com.mugil.shapes.Point">\r\n  <property name="x" value="-20"\/>\r\n  <property name="y" value="0"\/>\r\n<\/bean>\r\n<bean id="pointB" class="com.mugil.shapes.Point">\r\n  <property name="x" value="0"\/>\r\n  <property name="y" value="0"\/>\r\n<\/bean>\r\n<bean id="pointC" class="com.mugil.shapes.Point">\r\n  <property name="x" value="20"\/>\r\n  <property name="y" value="0"\/>\r\n<\/bean>\r\n<\/pre>\n
The Name of the instanceVariable in class should match the autowired xml bean Name.
\nTriangle.java<\/strong><\/p>\n
 \r\npublic class Triangle {\t\r\n\tprivate Point pointA;\r\n\tprivate Point pointB;\r\n\tprivate Point pointC;\r\n.        \r\n.\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
spring.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-\/\/SPRING\/\/DTD BEAN\/\/EN" "http:\/\/www.springframework.org\/dtd\/spring-beans.dtd"> <beans> <bean id="triangleId" class="com.mugil.shapes.Triangle"\/> <\/beans> Triangle.java package com.mugil.shapes; public class Triangle { private String type; public String getType() { return type; } public void setType(String type) { this.type = type; } public void drawShape() { System.out.println("Shape of Triangle"); } } Reading value of Bean by… Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[189],"tags":[],"class_list":["post-1506","post","type-post","status-publish","format-standard","hentry","category-form-elements-spring"],"_links":{"self":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/1506","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/comments?post=1506"}],"version-history":[{"count":8,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/1506\/revisions"}],"predecessor-version":[{"id":1514,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/1506\/revisions\/1514"}],"wp:attachment":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/media?parent=1506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/categories?post=1506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/tags?post=1506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}