Several Development Modes for Action
1. Write a class that inherits ActionSupport and can use some of its functions
2. Write a class to implement the Action interface, override the execute method, and do not use the method defined in ActionSupport
3. Neither inherits nor implements. Write a method directly in this class to handle our logic, and nothing can be done.
Wildcards for struts
<action name="user_*_*" class="" method={1}">
<result name="{1}">/{2}.jsp</result>
</action>Path matching for struts
Namespace="/" default namespace
Namespace="/a" custom namespace
localhost:8080/project name/a access path
Matching principle
If it is a path such as localhost:8080/project name/a/b/c, then it can be found as follows
*/a/b/c
*/a/b
*/a
Constant use of struts
Find default.properties file
Modify Constants Inside
<!--This is the maximum size of the uploaded file represented-->
<constant name="struts.multipart.maxSize" value="123456789"></constant>
<!--Set is struts Coding for-->
<constant name="struts.i18n.encoding" value="UTF-8"></constant>
<!--Set is struts Default Access Suffix
value="action The suffix must be action Otherwise, it will not be accessible"
value="action,do":Representation suffix can only be action perhaps do Can't be anything else
value="action,do,":Representation suffixes can be action perhaps do Or no suffix
-->
<constant name="struts.action.extension" value="action,do,"></constant>
<!--To allow dynamic methods to be invoked, dynamic methods are actionName Add directly on the basis of!Adding a method name so that it directly specifies the execution of a method is called a dynamic method -->
<constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>
<!--xml Automatically load files after changes-->
<constant name="struts.configuration.xml.reload" value="true"></constant>Default configuration for struts
Global result set (principle local priority)
<global-results>
<result name="success">/index.jsp</result>
</global-results>Because struts-default has a default action configuration
<default-class-ref class="com.opensymphony.xwork2.ActionSupport" />Actions can omit classes and methods
Data processing for struts
1. Complete data placement into domain objects via the API of the Servlet
(Problems create struts-servlet coupling problems)
HttpServletRequest request = ServletActionContext.getRequest();
HttpSession session = request.getSession();
ServletContext application = ServletActionContext.getServletContext();
//Add data to a domain object
request.setAttribute("request_","Here is request Object Data");
session.setAttribute("session_","Here is session Object Data");
application.setAttribute("application_","Here is application Object Data");2 Get domain objects through ActionContext
ActionContext context = ActionContext.getContext();
//Getting Domain Objects from Instances
Map<String, Object> session = context.getSession();
Map<String, Object> application = context.getApplication();
Map<String, Object> request = context.getContextMap();
//Add data to a domain object
session.put("session_", "Session Data");
request.put("request_", "resuest Data");
application.put("application_", "application Data");3. Putting data into domain objects by implementing RequestAware or SessionAware or ApplicationAware
* and set method for three fields * struts automatically injects us into the domain object
This method can be used as a base class
public class CustomAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware
{
private Map<String, Object> application;
private Map<String, Object> session;
Map<String, Object> request;
}Data auto-encapsulation for struts
1. Create javabean objects
2. Create a class to inherit ActionSupport
Write in this class
Method 1. set Method Injection
Note how previous versions were injected:
Using the construction method (in eclipse)
private User user=new User();Current version of the injection method (MyEclipse):
private User use
public void setUser(User user) {
this.user = user;
}
public User getUser() {
return user;
}Converter for date type
Write a class to inherit StrutsTypeCover
Re-method
convertFromString: Converts a string to another type
convertToString: Convert other types to strings
Write a configuration file
1. The profile name must be ActionName-conversion.properties.
Format java.util.Date=action full path
2. Content of the configuration file: properties of the converter JavaBean object. Properties
3. Configuration files must be located in the same directory as Action