Spring tutorials

SPRING A.Spring basic.   !" Ví dụ: Mô hình : Class Hello: package org.quangthao; public class Hello { String name; public Hello() { super(); } public Hello(String name) { super(); this.name = name; } public void sayHello(){ System.out.print("Hello "+name); } public String getName() { return name; } public void setName(String name) { this.name = name; } } Class Main: package org.quangthao; import org.springframework.cglib.proxy.Factory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args){ ApplicationContext context=new ClassPathXmlApplicationContext("context.xml"); Hello hello=(Hello)context.getBean("hello"); hello.sayHello(); } } Configuration file :context.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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans- 2.5.xsd"> <bean id="hello" class="org.quangthao.Hello"> <property name="name" value="edu"/> </bean> <bean id="triangleBean" class="org.koushik.brains.Triangle"></bean> </beans> Kết quả: Jul 22, 2013 1:38:47 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1256ea2: startup date [Mon Jul 22 01:38:47 ICT 2013]; root of context hierarchy Jul 22, 2013 1:38:47 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions INFO: Loading XML bean definitions from class path resource [context.xml] Jul 22, 2013 1:38:48 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@195d4fe: defining beans [hello,triangleBean]; root of factory hierarchy Hello edu #$%&%'()*&+" Ví dụ 1:Khởi tạo 2 giá trị type vào height trong configuration file . Class Triangle: package org.koushik.brains; public class Triangle { private String type; private int height; public Triangle() { super(); } public Triangle(String type, int height) { super(); this.type = type; this.height = height; } public void draw(){ System.out.print("Type :"+type+" Height: "+height ); } public String getType() { return type; } public void setType(String type) { this.type = type; } public int getHeight() { return height; } Class DrawingApp: package org.koushik.brains; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class DrawingApp { public static void main(String[] args){ ApplicationContext context=new ClassPathXmlApplicationContext("context.xml"); Triangle triangle=(Triangle)context.getBean("triangleBean"); triangle.draw(); } } context.xml Theo index :theo tham số truyền vào,tham số đầu tiên có index bằng 0,và tham số tiếp theo sẽ là 1,…2…3… <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans- 2.5.xsd"> <bean id="triangleBean" class="org.koushik.brains.Triangle"> <constructor-arg index="0" value="Hinh vuong"/> <constructor-arg index="1" value="20"/> </bean> </beans> Kết quả : Type :Hinh vuong Height: 20 Có thể kết hợp thêm thuộc tính type để ta có thể xác định kiểu của value truyền vào: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans- 2.5.xsd"> <bean id="triangleBean" class="org.koushik.brains.Triangle"> <constructor-arg type="String" value="Hinh vuong"/> <constructor-arg type="int" value="20"/> </bean> </beans> Kết quả : Type :Hinh vuong Height: 20 Note:Nếu không thêm index và type thì chường trình sẽ hiểu constructor-arg đầu tiên có index là 0 và lần lượt những constructor sau sẽ có index tăng dần. Ví dụ 2 : 1. IOutputGenerator An interface and implementation class of it. package com.mkyong.output; public interface IOutputGenerator { public void generateOutput(); } package com.mkyong.output.impl; import com.mkyong.output.IOutputGenerator; public class JsonOutputGenerator implements IOutputGenerator { public void generateOutput(){ System.out.println("This is Json Output Generator"); } } 2. Helper class A helper class, later use Spring to DI the IOutputGenerator, via constructor. package com.mkyong.output; import com.mkyong.output.IOutputGenerator; public class OutputHelper { IOutputGenerator outputGenerator; public void generateOutput() { outputGenerator.generateOutput(); } //DI via constructor public OutputHelper(IOutputGenerator outputGenerator){ this.outputGenerator = outputGenerator; } } 3. Spring conguraon See below Spring bean configuration, Spring will DI above “JsonOutputGenerator” into this “OutputHelper” class, via constructor “public OutputHelper(IOutputGenerator outputGenerator)“. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="OutputHelper" class="com.mkyong.output.OutputHelper"> <constructor-arg> <ref bean="JsonOutputGenerator" /> </constructor-arg> </bean> <bean id="JsonOutputGenerator" class="com.mkyong.output.impl.JsonOutputGenerator" /> </beans> 4. Run it Load everything, and run it. package com.mkyong.common; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.mkyong.output.OutputHelper; public class App { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext( "SpringBeans.xml"); OutputHelper output = (OutputHelper)context.getBean("OutputHelper"); output.generateOutput(); } } Ví dụ 3: package com.mkyong.common; public class Customer { private String name; private String address; private int age; public Customer(String name, String address, int age) { this.name = name; this.address = address; this.age = age; } public Customer(String name, int age, String address) { this.name = name; this.age = age; this.address = address; } //getter and setter methods public String toString(){ return " name : " +name + "\n address : " + address + "\n age : " + age; } } <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="CustomerBean" class="com.mkyong.common.Customer"> <constructor-arg type="java.lang.String"> <value>mkyong</value> </constructor-arg> [...]... } beans.xml Kết quả: Jul 22, 2013 5:16:18 PM org.springframework.context.support.AbstractApplicationContext... xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/springbeans.xsd"> Kết quả : Jul 22, 2013 5:24:32 PM org.springframework.context.support.AbstractApplicationContext... System.out.println("C("+C.getX()+","+C.getY()+")"); } } context.xml ... triangle=(Triangle)context.getBean("triangleBean"); triangle.draw(); } } context.xml ... triangle=(Triangle)context.getBean("triangleBean"); triangle.draw(); } } context.xml . name; } } Class Main: package org.quangthao; import org.springframework.cglib.proxy.Factory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public. xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans /spring- beans- 2.5.xsd"> <bean. xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans /spring- beans- 2.5.xsd"> <bean