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Struts2 自定义拦截器(方法拦截器)

2013-09-27 11:24 465 查看
一、实现Interceptor接口

1
public
interface
Interceptor
extends

Serializable{
2
public

void
 
init();

3
public

void
 
destroy();

4
public

String intercept(ActionInvocation invocation)();

5
}
实现上述方法 

二、继承AbstractInterceptor类，重写intercept()方法即可 

  此方法更可行，其实AbstractInterceptor类也就是实现了Interceptor接口 

1
invocation.invoke();表示该方法执行完后执行Action的execute()方法或者执行下一个拦截器
2
invocation.getAction(); 可以将该法强制转换为Action的类类型
三、方法拦截器:继承MethodFilterInterceptor类,重写doIntercept()方法

MethodFilerInterceptor实现方法过滤中用到的两个参数
execludeMethods：该参数指定拦截器拒绝拦截的方法列表，多个方法用“，”隔开，指定了这个参数，拦截器不会拦截指定列表中的方法，就是所谓的黑名单
includeMethods：该参数指定拦截器需要拦截的方法列表，如果指定了参数，则指定的Action在执行前会被拦截，即白名单。
定义好自定义拦截器后，就要使用自定义拦截器，在struts.xml文档中 

一、包内定义拦截器 

1
<
package....
>
2
<
interceptors
>
3
<
interceptor

name
=
"myinterceptor"

class
=
"...."
>
4
</
interceptor
>
5
</
interceptors
>
6
</
package
>
二、action内使用拦截器 

1
<
action

.....>
2
<
result.....
></
result
>
3
<
interceptor-ref

name
=
"defaultStack"
></
interceptor-ref
>
4
<
interceptor-ref

name
=
"myinterceptor"
></
interceptor-ref
>
5
</
action
>
主要:可以看出使用了自定义拦截器的action要配置默认拦截器的引用，因为默认拦截器包含了参数的读取、session的管理等功能 

一下是例子:

MyMethodInterceptor

01
public
 
class
 
MyMethodInterceptor
extends

MethodFilterInterceptor{
02
protected

String doIntercept(ActionInvocation invocation)
throws

Exception {
03
// TODO Auto-generated method stub
04
System.out.println(
"进入MyMethodInterceptor方法拦截器!!!!!!!!!!!!!"
);
05
Map session = invocation.getInvocationContext().getSession();
06
String name = (String) session.get(
"uname"
);
07
if

(name !=
null
) {
08
  
return

invocation.invoke();
09
}
10
return

"input"
;
11
}

12
}
struts.xml

01
<?
xml

version
=
"1.0"

encoding
=
"UTF-8"

?>
02
<!DOCTYPE struts PUBLIC
03
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
04
"http://struts.apache.org/dtds/struts-2.3.dtd">
05
 
06
<
struts
>
07
<
constant

name
=
"struts.i18n.encoding"

value
=
"UTF-8"
></
constant
>
08
<
constant

name
=
"struts.enable.DynamicMethodInvocation"

value
=
"true"
></
constant
>
09
<!-- <constant name="struts.action.extension" value="action,abc"></constant>-->
  
10
  
 
11
<
package

abstract
=
"true"

name
=
"pk1"

namespace
=
"/"

extends
=
"struts-default"
></
package
>
12
  
 
13
<
package

name
=
"pk2"

extends
=
"pk1"
>
14
<
interceptors
>
15
  
<
interceptor

name
=
"test1"

class
=
"org.interceptors.MyTimerInterceptor"
/>
16
 
17
  
<
interceptor

name
=
"method1"

class
=
"org.interceptors.MyMethodInterceptor"
>
18
 
<
param

name
=
"excludeMethods"
>login</
param
>
19
  
</
interceptor
>
20
 
21
  
<
interceptor-stack

name
=
"myStack"
>
22
 
<
interceptor-ref

name
=
"defaultStack"
></
interceptor-ref
>
23
 
<
interceptor-ref

name
=
"method1"
></
interceptor-ref
>
24
 
<
interceptor-ref

name
=
"test1"
></
interceptor-ref
>
25
 
26
  
</
interceptor-stack
>
27
</
interceptors
>
28
<!--<default-interceptor-ref name="myStack"></default-interceptor-ref>-->
  
29
 
 
30
<
action

name
=
"login_*_*"

class
=
"org.hzy.Actions.LoginAction"

method
=
"{1}"
>
31
  
<
interceptor-ref

name
=
"myStack"
></
interceptor-ref
>
32
  
<
result

name
=
"success"

type
=
"chain"
>{2}</
result
>
33
  
<
result

name
=
"input"
>index.jsp</
result
>
34
  
<
result

name
=
"error"
>/WEB-INF/Jsp/error.jsp</
result
>
35
</
action
>
36
 
 
37
<
action

name
=
"query_*"

class
=
"org.hzy.Actions.QueryAction"

method
=
"{1}"
>
38
  
<
result
>/WEB-INF/Jsp/show.jsp</
result
>
39
</
action
>
40
 
 
41
<
action

name
=
"upload_*"

class
=
"org.hzy.Actions.FileUploadAction"

method
=
"{1}"
>
42
  
<
result
>/WEB-INF/Jsp/show.jsp</
result
>
43
</
action
>
44
</
package
>
45
</
struts
>

                                            

                                        

                        
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