权限控制，顾名思义就是对于某些页面或者操作需要满足一定的权限要求才能继续继续进行。比如说：后台管理需要管理员登录，用户密码修改等操作需要用户登录等等。在Struts2中，简单的权限控制可以通过配置拦截器即可。下面我以修改密码进行举例：
（1）定义拦截器CheckInterceptor.java用于验证用户是否登录
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package
com.zxpm.interceptor;
import
java.util.Map;
import
com.opensymphony.xwork2.ActionInvocation;
import
com.opensymphony.xwork2.interceptor.Interceptor;
import
com.zxpm.entity.Users;
public
class
CheckInterceptor
implements
Interceptor {
public
String intercept(ActionInvocation arg0)
throws
Exception {
Map<String, Object> session = arg0.getInvocationContext().getSession();
Users u = (Users) session.get(
"user"
);
if
(u !=
null
)
return
arg0.invoke();
else
return
"login"
;
}
public
void
destroy() {
// TODO Auto-generated method stub
}
public
void
init() {
// TODO Auto-generated method stub
}}
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（2）配置struts.xml文件：
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<
package
name
=
"user"
namespace
=
"/user"
extends
=
"struts-default"
>
<
interceptors
>
<!-- 声明拦截器 -->
<
interceptor
name
=
"loginInterceptor"
class
=
"com.zxpm.interceptor.CheckInterceptor"
/>
<
interceptor
name
=
"errorInterceptor"
class
=
"com.zxpm.interceptor.ErrorInterceptor"
/>
<!-- 配置拦截器栈 -->
<
interceptor-stack
name
=
"myErrorInterceptor"
>
<
interceptor-ref
name
=
"defaultStack"
/>
<
interceptor-ref
name
=
"errorInterceptor"
/>
</
interceptor-stack
>
</
interceptors
>
<!-- 覆盖底层的拦截器栈 对包中的所有action都有效 -->
<
default-interceptor-ref
name
=
"myErrorInterceptor"
/>
<
global-results
>
<
result
name
=
"errorMsg"
>/error.jsp</
result
>
</
global-results
>
<
global-exception-mappings
>
<
exception-mapping
result
=
"errorMsg"
exception
=
"java.lang.Exception"
></
exception-mapping
>
</
global-exception-mappings
>
<
action
name
=
"modifyPwd"
class
=
"user"
method
=
"modifyPassword"
>
<
result
type
=
"redirect"
>/index.jsp</
result
>
<
result
name
=
"login"
type
=
"redirect"
>/index.jsp</
result
>
<
interceptor-ref
name
=
"loginInterceptor"
/>
<
interceptor-ref
name
=
"defaultStack"
/>
</
action
>
</
package
>
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注：i)由于这里定义了关于异常的拦截器，因此代码显得稍多，实际上就是申明拦截器，然后在action中添加interceptor-ref即可；ii)我这个小项目因为登录操作在首页，因此直接就重定向到首页去了
本文转自 pangfc 51CTO博客，原文链接：http://blog.51cto.com/983836259/1741570，如需转载请自行联系原作者
