Spring MVC Learning Starter Notes

Using the spring steps

1. Add dependency
2. Creating an XML file
3. Configuration (classes that need to be managed) bean
4. Instantiating a context class
5. Getbean Object

To create a new MAVEN project using idea, add dependencies in Pom.xml:

<Dependencies>        <!--Https://mvnrepository.com/artifact/org.springframework/spring-context -        <Dependency>            <groupId>Org.springframework</groupId>            <Artifactid>Spring-context</Artifactid>            <version>4.3.13.RELEASE</version>        </Dependency></Dependencies>

Create an entity, Student.java:

 Package entity;  Public class Student {    publicvoid  hello () {        System.out.println ("Hello SPring mvc! ");    }}

Select Project Right--Create a spring Config:

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop.xsd ">        <BeanID= "Stu"class= "entity. Student "></Bean></Beans>

Write a Main.java class under the entity package for testing:

 Packageentity;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classMain { Public Static voidMain (string[] args) {//Superclass ApplicationContext (is an interface)--so the new subclass is required//Classpath Class Path = = is put together with the code, under the main folderApplicationContext ApplicationContext =NewClasspathxmlapplicationcontext ("Springmvc.xml"); //ctrl+h (shortcut key)--See type hierarchyStudent Student = (Student) applicationcontext.getbean ("Stu"); The ID name of the XML Student.hello ();}

Project directory Structure:

Problem:

　　

A: The delimiter can be mixed, can be used, respectively, (space) three symbols as separators, and: will be an error, the test code is as follows:

The code in the XML:

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop.xsd ">    <BeanID= "Stu"name= "Student S,st"class= "entity. Student "></Bean>    <!--can be mixed with -    <!--<bean id= "Stu" Name= "Student,s" class= "entity. Student "></bean> <bean id=" Stu "Name=" Student;s "class=" entity. Student "></bean> -</Beans>

Code for the Main.java test:

New Classpathxmlapplicationcontext ("Springmvc.xml");         // ctrl+h-to-type hierarchical XSD        /* Student Student = (Student) applicationcontext.getbean ("Stu");        Student.hello ();        Student student1 = (Student) applicationcontext.getbean ("Student");        Student1.hello ();        Student Student2 = (Student) Applicationcontext.getbean ("s");        Student2.hello ();        Student Student3 = (Student) Applicationcontext.getbean ("St");        Student3.hello (); */

　　<!--Create objects in three forms: 1. Direct new;2. Indirect use of factory class new-why use:; 3. Implement Interface--

The first: the one mentioned above

The second type:

Entity code:

 Package entity;  Public class Student {      publicstatic  Student Hello () {        System.out.println (" Hello SPring mvc! ");         return New Student ();    }}

XML code:

<id= "XX"  class= "entity." Student "  factory-method=" Hello "></bean>

Main test code:

Student student4 = (Student) applicationcontext.getbean ("xx");

The third type:

Entity code:

 Public Student Hello () {       System.out.println ("Hello SPring mvc! ");        return New Student ();   }

XML code (method one):

 <  bean  id  = "Factory"   class  = "entity. Student " ></ bean  >  <  bean  Span style= "COLOR: #ff0000" >id  = "yy"   class  = "entity. Student "  Factory-bean  =" Factory " Span style= "COLOR: #ff0000" > Factory-method  = "Hello"  ></ bean  >  

XML code (method two):

< can I write myself!--xml: no? What about aliases? Yes-

<BeanID= "Factory"class= "entity. Student "name= "Student S"></Bean>    <BeanID= "yy"class= "entity. Student "Factory-bean= "S"Factory-method= "Hello"></Bean>

Main test code:

Student student5 = (Student) applicationcontext.getbean ("yy");

　　<!--XML configuration can go to ID, how to write--

Entity code:

 Public Static Student Hello () {        System.out.println ("Hello SPring mvc! ");         return New Student ();    }

XML code:

<class= "entity. Student "></bean>

Main test code:

Student student6 =  Applicationcontext.getbean (Student.  Class); Student6.hello ();

Spring MVC Learning Starter Notes