struts2学习笔记-----拦截器

配置拦截器语法格式

<interceptor name="拦截器名字" class="对应的java类"/>

使用拦截器栈，为了能在多个动作中方便引用同一个或者几个拦截器，可以使用拦截器栈。

<interceptor >

<interceptor-stack name="拦截器栈名">

<interceptor-ref name="拦截器名字"/>

</interceptor-stack>

</interceptor>

当拦截器栈被配置一个action时，要想执行该action必须先执行拦截器栈里的所有拦截器

使用拦截器例子

在定义一个拦截器类的时候需要实现Interceptor接口，或者继承拦截器类AbstractInterceptor

例子：

1.创建jsp文件register.jsp

内如如下：

<%@taglib prefix="s" uri="/struts-tags" %>

<center>
<s:form action="reg" method="post">
<s:textfield name="userName" label="注册姓名" maxlength="20"></s:textfield>
<s:password name="userPassword" label="注册密码"></s:password>
<s:textarea name="userInfo" label="个人说明" cols="40" rows="5"></s:textarea>
<s:submit value="提交"></s:submit>
</s:form>
</center>

2.在src/action文件夹下创建Action类

package action;
import com.opensymphony.xwork2.ActionSupport;
public class RegisterAction extends ActionSupport {
private String userName;
private String userPassword;
private String userInfo;
public String getUserInfo()
{
return this.userInfo;
}
public void setUserInfo(String userInfo)
{
this.userInfo=userInfo;
}
public String getUserName()
{
return this.userName;
}
public void setUserName(String userName)
{
this.userName=userName;
}
public String getUserPassword()
{
return this.userPassword;
}
public void setUserPassword(String userPassword)
{
this.userPassword=userPassword;
}
public String execute()
{
return "success";
}
}

3.创建逻辑视图

<s:property value="userName"/><br>
<s:property value="userPassword"/><br>
<s:property value="userInfo"/>

4.创建拦截器类

package interceptor;
import action.RegisterAction;
import java.util.Map;
import com.opensymphony.xwork2.*;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class RegisterInterceptor extends AbstractInterceptor{

@Override
public String intercept(ActionInvocation ai) throws Exception {
// TODO Auto-generated method stub
Object object=ai.getAction();
if(object!=null)
{
if(object instanceof RegisterAction)
{
RegisterAction action=(RegisterAction)object;
String userInfo=action.getUserInfo();
if(userInfo.contains("坏"))
{
userInfo=userInfo.replaceAll("坏", "*");
action.setUserInfo(userInfo);
}
return ai.invoke();
}else
{
return Action.LOGIN;
}
}
else
{
return Action.LOGIN;
}

}

}

5.配置struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="default"  extends="struts-default">

<action name="loginRegister" class="action.loginRegister" method="execute">
<result name="success">/addsuccess.jsp</result>
</action>
<action name="register" class="action.loginRegister" method="register">
<result name="success">/addsuccess.jsp</result>
</action>
</package>
</struts>