Spring3 MVC Annotations (i)---annotations basic configuration and @controller and @RequestMapping common explanations

One: Configure Web. xml

1) Problem: There are multiple configuration files in the spring project Mvc.xml Dao.xml

2) Resolution: in Web. xml

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/xxx/*.xml</param-value>

XXX represents an XML file path *.xml represents any file with a suffix named xml

</init-param>

3) You can use commas to separate

II: Controller

In 1:spring MVC, controller is considered to be the C-control layer in MVC.

2: Canonical named Class name Xxxcontroller

3: If not based on annotations: the class needs to inherit Commandcontroller or many others see spring help

If based on annotations: Add @controller before the class name

4: Add: Precede the class name with this annotation, when spring starts or the Web service starts spring will automatically scan all packages (of course, this can be set)

Function: To tell the server that this class is MVC C This class can receive user requests to process user requests

Three: Question: How to receive user requests

1: Assume that the user request URL is: http://localhost:8080/project name/xxx.do do not do all the same regardless of this do you can use anything

2: At this point, Spring begins to find the corresponding method of processing the request in all C

3: In any class that can be C, in front of the method definition that you want to process this request

@RequestMapping ("/xxx") this time xxx is the user request XXX regardless of do

Public String Method Name ()

{

Return "AAA";

Returns a string that is useful to note which is the V-view layer used to determine which MVC to display

}

Four: The above is configured for MVC C that is, the control layer returns a string in the method used to determine the V-view layer of MVC

Question: How to get Spring to scan classes to build associations

1: The assumption in the configuration file (Spring) is Mvc.xml

2: Join <context:component-scan base-package= "package path"/>

Five: How the problem returns to the view layer V

1: FIX: At this point, you need to include the view parser in the configuration file, there are many kinds of, too many

2: Here with Jsp/jstl based view

3: Add bean Configuration in Web. xml

<bean class= "Org.s...f....web.servlet.view.internalresourceviewresolver" >

<property name= "prefix" value= "/web-inf/views"/> Prefix

<property name= "suffix" value= ". jsp"/> suffix

</bean>

Summary: Through the above 5 steps, basically complete the configuration of C V

1:spring C in general from the class name Xxxcontroller in this class need to add @controller flag This class can be used as the request processing class is the control class

2: This control class can have a lot of methods, which method is used to process the user request, just before that method to add @RequestMapping ("/xxxxx Request Path")

3; The return value after the request has been processed determines that the user will jump to that page after the processing is complete this is important

4: For example

@RequestMapping ("/xxx") this time xxx is the user request XXX regardless of do

Public String Method Name ()

{

Return "AAA";

Returns a string that is useful to note which is the V-view layer used to determine which MVC to display

}

Return AAA prefix suffix based on the view processor configuration in the configuration file

Page will jump to/web-inf/views/aaa.jsp

Spring3 MVC Annotations (i)---annotations basic configuration and @controller and @RequestMapping Common interpretation (RPM)