SpringMVC-RequestMapping comment

Explanation

Source:
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {
}
effect:
For establishing a correspondence between the request URL and requests processing method 
appears positions: 
the Class: 
request URL of the first stage to access the directory. Do not write here, then, is equivalent to the root directory of the application. Need to write the words / beginning. 
The purpose is to make it appear our URL can follow a modular management : 
for example: 
account module: 
/ the Account / the Add 
/ the Account / Update 
/ the Account / the Delete 
... 
Order Module: 
/ the Order / the Add 
/ the Order / Update 
/ the Order / delete 
the red part is to RequsetMappding written in the class, so that our URL more sophisticated. 
The method: 
request URL second-level access to the directory. 
Attribute: 
value : request for designating the URL . It and pathThe role of property is the same. 
Method : specify a request. 
the params : for the request parameters specified condition. It supports simple expression. Required request parameters of key and value must be 
configured exactly the same. 
For example: 
the params = { "accountName"} , the parameter indicates that the request must be accountName 
the params = { "moeny 100!"} , Indicates the request parameters money can not be 100 . 
headers : restriction request message header is used to specify the conditions. 
Note: The 
above four properties appear as long as 2 Shi or more, their relationship is with

method Example

Controller code

/**
* Save Account
* @return
*/
@RequestMapping(value="/saveAccount",method=RequestMethod.POST)
public String saveAccount() {
. System OUT .println ( " Save the accounts " );
 return  " Success " ;
}

jsp code

<! - Request exemplary embodiment -><a
href= "account/saveAccount"> saving accounts, GET requests </a>
<br/>
<form action="account/saveAccount" method="post">
<INPUT type = " Submit " value = " saving accounts, post Request " >
</form>

When using a get request, an error message is 405 , the information is a method does not support get way request

params example

Controller code

/**
* Delete Account
* @return
*/
@RequestMapping(value="/removeAccount",params= {"accountName","money>100"})
public String removeAccount() {
. System OUT .println ( " delete account " );
 return  " Success " ;
}

jsp code

<! - exemplary request parameters ->
href= <a "account/removeAccount?accountName=aaa&money> 100 " > delete the account, the amount of 100 </a>
<br/>
href= <a "account/removeAccount?accountName=aaa&money> 150 " > delete the account, the amount of 150 </a>

When we click on a hyperlink , you can visit a success.
When we click the second hyperlink, inaccessible. As shown below:

Examples headers

Controller code