01 |
<? xml version = "1.0" encoding = "UTF-8" ?> |
02 |
<!DOCTYPE
struts PUBLIC |
03 |
"-//Apache
Software Foundation//DTD Struts Configuration 2.0//EN" |
04 |
"http://struts.apache.org/dtds/struts-2.0.dtd"> |
05 |
06 |
< struts > |
07 |
08 |
< package name = "default" extends = "struts-default" > |
09 |
< action name = "login" class = "struts2.login.LoginAction" > |
10 |
< result name = "success" >result.jsp</ result > |
11 |
</ action > |
12 |
|
13 |
< action name = "login2" class = "struts2.login.Login2Action" > |
14 |
< result name = "success" >result.jsp</ result > |
15 |
</ action > |
16 |
|
17 |
< action name = "login3" class = "struts2.login.Login3Action" > |
18 |
< result name = "success" >result.jsp</ result > |
19 |
</ action > |
20 |
|
21 |
< action name = "login4" class = "struts2.login.Login4Action" > |
22 |
< result name = "success" >result.jsp</ result > |
23 |
</ action > |
24 |
</ package > |
25 |
|
26 |
</ struts > |
其中的LoginAction,Login2Action,Login3Action,Login4Action分別對應四種方式的Action。
文件名:result.jsp
文件內容:
1 |
<%@
page contentType="text/html; charset=gb2312" %> |
2 |
<%@
taglib uri="/struts-tags" prefix="s"%> |
3 |
4 |
< html > |
5 |
request
屬性是 ${requestScope.attribute}< br > |
6 |
session
屬性是 ${sessionScope.attribute}< br > |
7 |
application
屬性是 ${applicationScope.attribute}< br > |
8 |
</ html > |
文件名:getrequest.jsp
文件內容:
1 |
<%@
page contentType="text/html; charset=gb2312" %> |
2 |
<%@
taglib uri="/struts-tags" prefix="s"%> |
3 |
< html > |
4 |
< a href = "login.action" >servlet
不相關的 非IoC 取得Request等對象的方式</ a >< br > |
5 |
< a href = "login2.action" >servlet
不相關的 IoC 取得Request等對象的方式</ a >< br > |
6 |
< a href = "login3.action" >servlet
相關的 非IoC 取得Request等對象的方式</ a >< br > |
7 |
< a href = "login4.action" >servlet
相關的 IoC 取得Request等對象的方式</ a >< br > |
8 |
</ form > |
9 |
</ html > |
然後分別敘述4種方式,
1,servlet 不相關的 非IoC 取得Request等對象的方式
這種方法先取得ActionContext,然後獲取Map類型的request等對象
Action文件:
01 |
package struts2.login; |
02 |
03 |
import java.util.Map; |
04 |
05 |
import com.opensymphony.xwork2.ActionContext; |
06 |
import com.opensymphony.xwork2.ActionSupport; |
07 |
08 |
public class LoginAction extends ActionSupport{ |
09 |
private ActionContext
context; |
10 |
private Map
request; |
11 |
private Map
session; |
12 |
private Map
application; |
13 |
|
14 |
@Override |
15 |
public String
execute() throws Exception
{ |
16 |
//
TODO Auto-generated method stub |
17 |
this .context
= ActionContext.getContext(); |
18 |
this .request
= (Map) this .context.get( "request" ); |
19 |
this .session
= this .context.getSession(); |
20 |
this .application
= this .context.getApplication(); |
21 |
this .request.put( "attribute" , "request
value servlet 不相關的 非IoC " ); |
22 |
this .session.put( "attribute" , "session
value servlet 不相關的 非IoC " ); |
23 |
this .application.put( "attribute" , "application
value servlet 不相關的非IoC " ); |
24 |
return SUCCESS; |
25 |
} |
26 |
} |
2,servlet 不相關的 IoC 取得Request等對象的方式
這種方法,是實現特定的接口,由container來設定request等對象。請注意如下代碼示例中紅色文字的部分。
Action文件:
01 |
package struts2.login; |
02 |
03 |
import java.util.Map; |
04 |
05 |
import org.apache.struts2.interceptor.ApplicationAware; |
06 |
import org.apache.struts2.interceptor.RequestAware; |
07 |
import org.apache.struts2.interceptor.SessionAware; |
08 |
09 |
import com.opensymphony.xwork2.ActionSupport; |
10 |
11 |
public class Login2Action extends ActionSupport |
12 |
implements RequestAware
, SessionAware, ApplicationAware{ |
13 |
private Map
request; |
14 |
private Map
session; |
15 |
private Map
application; |
16 |
|
17 |
@Override |
18 |
public String
execute() throws Exception
{ |
19 |
//
TODO Auto-generated method stub |
20 |
this .request.put( "attribute" , "request
value servlet 不相關的 IoC " ); |
21 |
this .session.put( "attribute" , "session
value servlet 不相關的 IoC " ); |
22 |
this .application.put( "attribute" , "application
value servlet 不相關的 IoC " ); |
23 |
return SUCCESS; |
24 |
} |
25 |
26 |
@Override |
27 |
public void setRequest(Map<String,
Object> arg0) { |
28 |
//
TODO Auto-generated method stub |
29 |
this .request
= arg0; |
30 |
} |
31 |
32 |
@Override |
33 |
public void setSession(Map<String,
Object> arg0) { |
34 |
//
TODO Auto-generated method stub |
35 |
this .session
= arg0; |
36 |
} |
37 |
38 |
@Override |
39 |
public void setApplication(Map<String,
Object> arg0) { |
40 |
//
TODO Auto-generated method stub |
41 |
this .application
= arg0; |
42 |
} |
43 |
} |
3,servlet 相關的 非IoC 取得Request等對象的方式
這種方法可以獲取servlet相關的request等對象,也就是說這種方式取出的request對象不單單是設定屬性的作用,而是可以獲取http相關的信息。
取出方法,請參看代碼中的藍字部分。
Action文件:
01 |
package struts2.login; |
02 |
03 |
import javax.servlet.ServletContext; |
04 |
import javax.servlet.http.HttpServletRequest; |
05 |
import javax.servlet.http.HttpSession; |
06 |
07 |
import org.apache.struts2.ServletActionContext; |
08 |
09 |
import com.opensymphony.xwork2.ActionSupport; |
10 |
11 |
public class Login3Action extends ActionSupport{ |
12 |
private HttpServletRequest
request; |
13 |
private HttpSession
session; |
14 |
private ServletContext
application; |
15 |
|
16 |
@Override |
17 |
public String
execute() throws Exception
{ |
18 |
//
TODO Auto-generated method stub |
19 |
this .request
= ServletActionContext.getRequest(); |
20 |
this .session
= this .request.getSession(); |
21 |
this .application
= ServletActionContext.getServletContext(); |
22 |
this .request.setAttribute( "attribute" , "request
value servlet 相關的非IoC " ); |
23 |
this .session.setAttribute( "attribute" , "session
value servlet 相關的非IoC " ); |
24 |
this .application.setAttribute( "attribute" , "application
value servlet 相關的 非IoC " ); |
25 |
return SUCCESS; |
26 |
} |
27 |
|
28 |
} |
4,servlet 相關的 IoC 取得Request等對象的方式
這種方法也可以獲取servlet相關的request等對象,也就是說這種方式取出的request對象不單單是設定屬性的作用,而是可以獲取http相關的信息。
但是取出方法是通過接口進行實現,也就是由struts2的container來設定,請參看代碼中的紅字部分。
Action文件:
01 |
package struts2.login; |
02 |
03 |
import javax.servlet.ServletContext; |
04 |
import javax.servlet.http.HttpServletRequest; |
05 |
import javax.servlet.http.HttpSession; |
06 |
07 |
import org.apache.struts2.interceptor.ServletRequestAware; |
08 |
import org.apache.struts2.util.ServletContextAware; |
09 |
10 |
import com.opensymphony.xwork2.ActionSupport; |
11 |
12 |
public class Login4Action extends ActionSupport |
13 |
implements ServletRequestAware
, ServletContextAware{ |
14 |
private HttpServletRequest
request; |
15 |
private HttpSession
session; |
16 |
private ServletContext
application; |
17 |
|
18 |
@Override |
19 |
public String
execute() throws Exception
{ |
20 |
//
TODO Auto-generated method stub |
21 |
this .request.setAttribute( "attribute" , "request
value servlet 相關的 IoC " ); |
22 |
this .session
= this .request.getSession(); |
23 |
this .session.setAttribute( "attribute" , "session
value servlet 相關的 IoC " ); |
24 |
this .application.setAttribute( "attribute" , "application
value servlet 相關的 IoC " ); |
25 |
return SUCCESS; |
26 |
} |
27 |
28 |
@Override |
29 |
public void setServletRequest(HttpServletRequest
arg0) { |
30 |
//
TODO Auto-generated method stub |
31 |
this .request
= arg0; |
32 |
} |
33 |
34 |
@Override |
35 |
public void setServletContext(ServletContext
arg0) { |
36 |
//
TODO Auto-generated method stub |
37 |
this .application
= arg0; |
38 |
} |
39 |
} |